File: posix.c

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/***
@module lposix
*/
/*
*  POSIX library for Lua 5.1/5.2.
* (c) Reuben Thomas <rrt@sc3d.org> 2010-2013
* (c) Natanael Copa <natanael.copa@gmail.com> 2008-2010
* Clean up and bug fixes by Leo Razoumov <slonik.az@gmail.com> 2006-10-11
* Luiz Henrique de Figueiredo <lhf@tecgraf.puc-rio.br> 07 Apr 2006 23:17:49
* Based on original by Claudio Terra for Lua 3.x.
* With contributions by Roberto Ierusalimschy.
* With documentation from Steve Donovan 2012
*/
#ifdef __GNU__
#define _GNU_SOURCE
#endif

#include <config.h>

#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <getopt.h>
#include <glob.h>
#include <grp.h>
#include <libgen.h>
#include <limits.h>
#include <poll.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <utime.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/stat.h>
#include <sys/times.h>
#include <sys/types.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <termios.h>
#if _POSIX_VERSION >= 200112L
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <arpa/inet.h>
#include <netdb.h>
#endif
#if HAVE_CRYPT_H
#  include <crypt.h>
#endif
#if HAVE_SYS_STATVFS_H
#  include <sys/statvfs.h>
#endif

#define MYNAME		"posix"
#define MYVERSION	MYNAME " library for " LUA_VERSION " / " VERSION

#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
#include "lua52compat.h"

#ifndef STREQ
#  define STREQ(a, b)     (strcmp (a, b) == 0)
#endif

/* Mark unused parameters required only to match a function type
   specification. */
#ifdef __GNUC__
#  define UNUSED(x) UNUSED_ ## x __attribute__((__unused__))
#else
#  define UNUSED(x) UNUSED_ ## x
#endif


/* The extra indirection to these macros is required so that if the
   arguments are themselves macros, they will get expanded too.  */
#define LPOSIX__SPLICE(_s, _t)	_s##_t
#define LPOSIX_SPLICE(_s, _t)	LPOSIX__SPLICE(_s, _t)

#define LPOSIX__STR(_s)		#_s
#define LPOSIX_STR(_s)		LPOSIX__STR(_s)

/* The +1 is to step over the leading '_' that is required to prevent
   premature expansion of MENTRY arguments if we didn't add it.  */
#define LPOSIX__STR_1(_s)	(#_s + 1)
#define LPOSIX_STR_1(_s)	LPOSIX__STR_1(_s)

/* ISO C functions missing from the standard Lua libraries. */

/***
Abort the program immediately.
@function abort
@see abort(3)
*/
static int Pabort(lua_State *L)
{
	(void)L; /* Avoid a compiler warning. */
	abort();
	return 0; /* Avoid a compiler warning (or possibly cause one
		     if the compiler's too clever, sigh). */
}

/***
Raise a signal on this process.
@function raise
@see raise(3)
@int nsig
@return integer error code
*/
static int Praise(lua_State *L)
{
	int sig = luaL_checkint(L, 1);
	lua_pop(L, 1);
	lua_pushinteger(L, raise(sig));
	return 1;
}

static int bind_ctype(lua_State *L, int (*cb)(int))
{
	const char *s = luaL_checkstring(L, 1);
	char c = *s;
	lua_pop(L, 1);
	lua_pushboolean(L, cb((int)c));
	return 1;
}

/***
Check for any printable character except space.
@function isgraph
@see isprint(3)
@string character to check
@return true if character is in the class
*/
static int Pisgraph(lua_State *L)
{
	return bind_ctype(L, &isgraph);
}

/***
Check for any printable character including space.
@function isprint
@see isgraph(3)
@string character to check
@return true if character is in the class
*/
static int Pisprint(lua_State *L)
{
	return bind_ctype(L, &isprint);
}


/* File mode translation between octal codes and `rwxrwxrwx' strings,
   and between octal masks and `ugoa+-=rwx' strings. */

static const struct { char c; mode_t b; } M[] =
{
	{'r', S_IRUSR}, {'w', S_IWUSR}, {'x', S_IXUSR},
	{'r', S_IRGRP}, {'w', S_IWGRP}, {'x', S_IXGRP},
	{'r', S_IROTH}, {'w', S_IWOTH}, {'x', S_IXOTH},
};

static void pushmode(lua_State *L, mode_t mode)
{
	char m[9];
	int i;
	for (i=0; i<9; i++)
		m[i]= (mode & M[i].b) ? M[i].c : '-';
	if (mode & S_ISUID)
		m[2]= (mode & S_IXUSR) ? 's' : 'S';
	if (mode & S_ISGID)
		m[5]= (mode & S_IXGRP) ? 's' : 'S';
	lua_pushlstring(L, m, 9);
}

static int rwxrwxrwx(mode_t *mode, const char *p)
{
	int count;
	mode_t tmp_mode = *mode;

	tmp_mode &= ~(S_ISUID | S_ISGID); /* turn off suid and sgid flags */
	for (count=0; count<9; count ++)
	{
		if (*p == M[count].c)
			tmp_mode |= M[count].b;	/* set a bit */
		else if (*p == '-')
			tmp_mode &= ~M[count].b;	/* clear a bit */
		else if (*p=='s')
			switch(count)
			{
			case 2: /* turn on suid flag */
				tmp_mode |= S_ISUID | S_IXUSR;
				break;
			case 5: /* turn on sgid flag */
				tmp_mode |= S_ISGID | S_IXGRP;
				break;
			default:
				return -4; /* failed! -- bad rwxrwxrwx mode change */
				break;
			}
		p++;
	}
	*mode = tmp_mode;
	return 0;
}

static int octal_mode(mode_t *mode, const char *p)
{
	mode_t tmp_mode = 0;
	char* endp = NULL;
	if (strlen(p) > 8)
		return -4; /* error -- bad syntax, string too long */
	tmp_mode = strtol(p, &endp, 8);
	if (p && endp && *p != '\0' && *endp == '\0') {
		*mode = tmp_mode;
		return 0;
	}
	return -4; /* error -- bad syntax */
}

static int mode_munch(mode_t *mode, const char* p)
{
	char op=0;
	mode_t affected_bits, ch_mode;
	int done = 0;

	while (!done)
	{
		/* step 0 -- clear temporary variables */
		affected_bits=0;
		ch_mode=0;

		/* step 1 -- who's affected? */

		/* mode string given in rwxrwxrwx format */
		if (*p == 'r' || *p == '-')
			return rwxrwxrwx(mode, p);

		/* mode string given in octal */
		if (*p >= '0' && *p <= '7')
			return octal_mode(mode, p);

		/* mode string given in ugoa+-=rwx format */
		for ( ; ; p++)
			switch (*p)
			{
			case 'u':
				affected_bits |= 04700;
				break;
			case 'g':
				affected_bits |= 02070;
				break;
			case 'o':
				affected_bits |= 01007;
				break;
			case 'a':
				affected_bits |= 07777;
				break;
			case ' ': /* ignore spaces */
				break;
			default:
				goto no_more_affected;
			}

		no_more_affected:
		/* If none specified, affect all bits. */
		if (affected_bits == 0)
			affected_bits = 07777;

		/* step 2 -- how is it changed? */
		switch (*p)
		{
		case '+':
		case '-':
		case '=':
			op = *p;
			break;
		case ' ': /* ignore spaces */
			break;
		default:
			return -1; /* failed! -- bad operator */
		}

		/* step 3 -- what are the changes? */
		for (p++ ; *p!=0 ; p++)
			switch (*p)
			{
			case 'r':
				ch_mode |= 00444;
				break;
			case 'w':
				ch_mode |= 00222;
				break;
			case 'x':
				ch_mode |= 00111;
				break;
			case 's':
				/* Set the setuid/gid bits if `u' or `g' is selected. */
				ch_mode |= 06000;
				break;
			case ' ':
				/* ignore spaces */
				break;
			default:
				goto specs_done;
			}

		specs_done:
		/* step 4 -- apply the changes */
		if (*p != ',')
			done = 1;
		if (*p != 0 && *p != ' ' && *p != ',')
			return -2; /* failed! -- bad mode change */
		p++;
		if (ch_mode)
			switch (op)
			{
			case '+':
				*mode |= ch_mode & affected_bits;
				break;
			case '-':
				*mode &= ~(ch_mode & affected_bits);
				break;
			case '=':
				*mode = (*mode & ~affected_bits) | (ch_mode & affected_bits);
				break;
			default:
				return -3; /* failed! -- unknown error */
			}
	}

	return 0; /* successful call */
}


/* Utility functions. */

typedef void (*Selector)(lua_State *L, int i, const void *data);

static int doselection(lua_State *L, int i, int n,
		       const char *const S[],
		       Selector F,
		       const void *data)
{
	if (lua_isnone(L, i) || lua_istable(L, i))
	{
		int j;
		if (lua_isnone(L, i))
			lua_createtable(L,0,n);
		else
			lua_settop(L, i);
		for (j=0; S[j]!=NULL; j++)
		{
			F(L, j, data);
			lua_setfield(L, -2, S[j]);
		}
		return 1;
	}
	else
	{
		int k,n=lua_gettop(L);
		for (k=i; k<=n; k++)
		{
			int j=luaL_checkoption(L, k, NULL, S);
			F(L, j, data);
			lua_replace(L, k);
		}
		return n-i+1;
	}
}
#define doselection(L,i,S,F,d) (doselection)(L,i,sizeof(S)/sizeof(*S)-1,S,F,d)

static int lookup_symbol(const char * const S[], const int K[], const char *str)
{
	int i;
	for (i = 0; S[i] != NULL; i++)
		if (strcasecmp(S[i], str) == 0)
			return K[i];
	return -1;
}

static int pusherror(lua_State *L, const char *info)
{
	lua_pushnil(L);
	if (info==NULL)
		lua_pushstring(L, strerror(errno));
	else
		lua_pushfstring(L, "%s: %s", info, strerror(errno));
	lua_pushinteger(L, errno);
	return 3;
}

static int pushresult(lua_State *L, int i, const char *info)
{
	if (i==-1)
		return pusherror(L, info);
	lua_pushinteger(L, i);
	return 1;
}

static void badoption(lua_State *L, int i, const char *what, int option)
{
	luaL_argerror(L, i,
		lua_pushfstring(L, "unknown %s option '%c'", what, option));
}

static uid_t mygetuid(lua_State *L, int i)
{
	if (lua_isnone(L, i))
		return -1;
	else if (lua_isnumber(L, i))
		return (uid_t) lua_tonumber(L, i);
	else if (lua_isstring(L, i))
	{
		struct passwd *p=getpwnam(lua_tostring(L, i));
		return (p==NULL) ? (uid_t)-1 : p->pw_uid;
	}
	else
		return luaL_typerror(L, i, "string or number");
}

static gid_t mygetgid(lua_State *L, int i)
{
	if (lua_isnone(L, i))
		return -1;
	else if (lua_isnumber(L, i))
		return (gid_t) lua_tonumber(L, i);
	else if (lua_isstring(L, i))
	{
		struct group *g=getgrnam(lua_tostring(L, i));
		return (g==NULL) ? (uid_t)-1 : g->gr_gid;
	}
	else
		return luaL_typerror(L, i, "string or number");
}


/* API functions */

/***
Describe an error code/and or read `errno`
@function errno
@see errno(3)
@int n optional error code (default: current value of `errno`)
@return description
@return error code
*/
static int Perrno(lua_State *L)
{
	int n = luaL_optint(L, 1, errno);
	lua_pushstring(L, strerror(n));
	lua_pushinteger(L, n);
	return 2;
}

/***
Set errno.
@function set_errno
@see errno(3)
@int n error code
*/
static int Pset_errno(lua_State *L)
{
	errno = luaL_checkint(L, 1);
	return 0;
}

/***
Find canonicalized absolute pathname.
@function realpath
@see realpath(3)
@string path
@return canonicalized absolute path, or nil on error
@return error message if failed
*/
static int Prealpath(lua_State *L)
{
	char *s;
	if ((s = realpath(luaL_checkstring(L, 1), NULL)) == NULL)
		return pusherror(L, "realpath");
	lua_pushstring(L, s);
	free(s);
	return 1;
}

/***
File part of path.
@function basename
@see basename(3)
@string path
@return file part
*/
static int Pbasename(lua_State *L)
{
	char *b;
	size_t len;
	void *ud;
	lua_Alloc lalloc = lua_getallocf(L, &ud);
	const char *path = luaL_checklstring(L, 1, &len);
	size_t path_len = strlen(path) + 1;
	if ((b = lalloc(ud, NULL, 0, path_len)) == NULL)
		return pusherror(L, "lalloc");
	lua_pushstring(L, basename(strcpy(b,path)));
	lalloc(ud, b, path_len, 0);
	return 1;
}

/***
Directory name of path.
@function dirname
@see dirname(3)
@string path
@return directory part
*/
static int Pdirname(lua_State *L)
{
	char *b;
	size_t len;
	void *ud;
	lua_Alloc lalloc = lua_getallocf(L, &ud);
	const char *path = luaL_checklstring(L, 1, &len);
	size_t path_len = strlen(path) + 1;
	if ((b = lalloc(ud, NULL, 0, path_len)) == NULL)
		return pusherror(L, "lalloc");
	lua_pushstring(L, dirname(strcpy(b,path)));
	lalloc(ud, b, path_len, 0);
	return 1;
}

/***
Contents of directory.
@function dir
@string path optional (default .)
@return contents as table
@see dir.lua
*/
static int Pdir(lua_State *L)
{
	const char *path = luaL_optstring(L, 1, ".");
	DIR *d = opendir(path);
	if (d == NULL)
		return pusherror(L, path);
	else
	{
		int i;
		struct dirent *entry;
		lua_newtable(L);
		for (i=1; (entry = readdir(d)) != NULL; i++)
		{
			lua_pushstring(L, entry->d_name);
			lua_rawseti(L, -2, i);
		}
		closedir(d);
		lua_pushinteger(L, i-1);
		return 2;
	}
}

/***
Match a filename against a shell pattern.
@function fnmatch
@see fnmatch(3)
@string pat shell pattern
@string name filename
@int flags optional (default 0)
@return true or false
@raise error if fnmatch failed
*/
static int Pfnmatch(lua_State *L)
{
	const char *pattern = lua_tostring(L, 1);
	const char *string = lua_tostring(L, 2);
	int flags = luaL_optint(L, 3, 0);
	int res = fnmatch(pattern, string, flags);
	if (res == 0)
		lua_pushboolean(L, 1);
	else if (res == FNM_NOMATCH)
		lua_pushboolean(L, 0);
	else
	{
		lua_pushstring(L, "fnmatch failed");
		lua_error(L);
	}
	return 1;
}

/***
Find all files in this directory matching a shell pattern.
@function glob
@see glob(3)
@see glob.lua
@string pat shell pattern
@return table of matching filenames
*/
static int Pglob(lua_State *L)
{
	const char *pattern = luaL_optstring(L, 1, "*");
	glob_t globres;

	if (glob(pattern, 0, NULL, &globres))
		return pusherror(L, pattern);
	else
	{
		unsigned int i;
		lua_newtable(L);
		for (i=1; i<=globres.gl_pathc; i++)
		{
			lua_pushstring(L, globres.gl_pathv[i-1]);
			lua_rawseti(L, -2, i);
		}
		globfree(&globres);
		return 1;
	}
}

static int aux_files(lua_State *L)
{
	DIR **p = (DIR **)lua_touserdata(L, lua_upvalueindex(1));
	DIR *d = *p;
	struct dirent *entry;
	if (d == NULL)
		return 0;
	entry = readdir(d);
	if (entry == NULL)
	{
		closedir(d);
		*p=NULL;
		return 0;
	}
	else
	{
		lua_pushstring(L, entry->d_name);
		return 1;
	}
}

static int dir_gc (lua_State *L)
{
	DIR *d = *(DIR **)lua_touserdata(L, 1);
	if (d!=NULL)
		closedir(d);
	return 0;
}

/***
Iterator over all files in this directory.
@function files
@string path optional (default .)
@return an iterator
*/
static int Pfiles(lua_State *L)
{
	const char *path = luaL_optstring(L, 1, ".");
	DIR **d = (DIR **)lua_newuserdata(L, sizeof(DIR *));
	if (luaL_newmetatable(L, MYNAME " dir handle"))
	{
		lua_pushcfunction(L, dir_gc);
		lua_setfield(L, -2, "__gc");
	}
	lua_setmetatable(L, -2);
	*d = opendir(path);
	if (*d == NULL)
		return pusherror(L, path);
	lua_pushcclosure(L, aux_files, 1);
	return 1;
}

/***
Current working directory for this process.
@function getcwd
@see getcwd(3)
@return path
*/
static int Pgetcwd(lua_State *L)
{
#ifdef __GNU__
	char *b = get_current_dir_name();
	if (b != NULL) {
		lua_pushstring(L, b);
		return 1;
	} else {
		/* we return the same error as below */
		return pusherror(L, ".");
	}
#else
	long size = pathconf(".", _PC_PATH_MAX);
	if (size == -1)
		return pusherror(L, "pathconf");
	void *ud;
	lua_Alloc lalloc = lua_getallocf(L, &ud);
	char *b, *ret;
	if (size == -1)
		size = _POSIX_PATH_MAX; /* FIXME: Retry if this is not long enough */
	if ((b = lalloc(ud, NULL, 0, (size_t)size + 1)) == NULL)
		return pusherror(L, "lalloc");
	ret = getcwd(b, (size_t)size);
	if (ret != NULL)
		lua_pushstring(L, b);
	lalloc(ud, b, (size_t)size + 1, 0);
	return (ret == NULL) ? pusherror(L, ".") : 1;
#endif
}

/***
Make a directory.
@function mkdir
@see mkdir(2)
@string path
@return 0 on success, nil otherwise
@return error message if failed.
*/
static int Pmkdir(lua_State *L)
{
	const char *path = luaL_checkstring(L, 1);
	return pushresult(L, mkdir(path, 0777), path);
}


/***
Set the working directory.
@function chdir
@see chdir(2)
@string path
@return 0 on success, nil otherwise
@return error message if failed.
@usage status, errstr, errno = posix.chdir("/var/tmp")
*/
static int Pchdir(lua_State *L)
{
	const char *path = luaL_checkstring(L, 1);
	return pushresult(L, chdir(path), path);
}

/***
Remove a directory.
@function rmdir
@see rmdir(2)
@string path
@return 0 on success, nil otherwise
@return error message if failed.
*/
static int Prmdir(lua_State *L)
{
	const char *path = luaL_checkstring(L, 1);
	return pushresult(L, rmdir(path), path);
}

/***
Unlink a file.
@function unlink
@see unlink(2)
@string path
@return 0 on success, nil otherwise
@return error message if failed.
*/
static int Punlink(lua_State *L)
{
	const char *path = luaL_checkstring(L, 1);
	return pushresult(L, unlink(path), path);
}

/***
Create a link.
@function link
@see link(2)
@see symlink(2)
@string target name
@string link name
@bool soft link
@return 0 on success, nil otherwise
@return error message if failed.
*/
static int Plink(lua_State *L)
{
	const char *oldpath = luaL_checkstring(L, 1);
	const char *newpath = luaL_checkstring(L, 2);
	return pushresult(L,
		(lua_toboolean(L,3) ? symlink : link)(oldpath, newpath), NULL);
}

/***
Read value of a symbolic link.
@function readlink
@see readlink(2)
@string path
@return link target on success, error otherwise
@return error message if failed
*/
static int Preadlink(lua_State *L)
{
	char *b;
	struct stat s;
	const char *path = luaL_checkstring(L, 1);
	void *ud;
	lua_Alloc lalloc = lua_getallocf(L, &ud);
	if (lstat(path, &s))
		return pusherror(L, path);
	if ((b = lalloc(ud, NULL, 0, s.st_size + 1)) == NULL)
		return pusherror(L, "lalloc");
	ssize_t n = readlink(path, b, s.st_size);
	if (n != -1)
		lua_pushlstring(L, b, n);
	lalloc(ud, b, s.st_size + 1, 0);
	return (n == -1) ? pusherror(L, path) : 1;
}

/***
Check real user's permissions for a file.
@function access
@see access(2)
@string path
@string mode optional, can contain 'r','w','x' and 'f' (default 'f')
@return 0 on success, nil otherwise
@return error message if failed.
@usage status, errstr, errno = posix.access("/etc/passwd", "rw")
*/
static int Paccess(lua_State *L)
{
	int mode=F_OK;
	const char *path=luaL_checkstring(L, 1);
	const char *s;
	for (s=luaL_optstring(L, 2, "f"); *s!=0 ; s++)
		switch (*s)
		{
			case ' ': break;
			case 'r': mode |= R_OK; break;
			case 'w': mode |= W_OK; break;
			case 'x': mode |= X_OK; break;
			case 'f': mode |= F_OK; break;
			default: badoption(L, 2, "mode", *s); break;
		}
	return pushresult(L, access(path, mode), path);
}

/***
File descriptor corresponding to a Lua file object.
@function fileno
@param file Lua file object
@return handle on success, nil otherwise
@return error message if failed.
*/
static int Pfileno(lua_State *L)
{
	FILE *f = *(FILE**) luaL_checkudata(L, 1, LUA_FILEHANDLE);
	return pushresult(L, fileno(f), NULL);
}


/***
Make a FIFO pipe.
@function mkfifo
@see mkfifo(2)
@string path
@return handle on success, nil otherwise
@return error message if failed.
*/
static int Pmkfifo(lua_State *L)
{
	const char *path = luaL_checkstring(L, 1);
	return pushresult(L, mkfifo(path, 0777), path);
}

/***
Create a unique temporary file.
@function mkstemp
@see mkstemp(3)
@string templ pattern that ends in "XXXXXX"
@return file descriptor, nil otherwise
@return name on success, error otherwise
@usage posix.mkstemp 'wooXXXXXX'
*/
static int Pmkstemp(lua_State *L)
{
	const char *path = luaL_checkstring(L, 1);
	size_t path_len = strlen(path) + 1;
	void *ud;
	lua_Alloc lalloc = lua_getallocf(L, &ud);
	char *tmppath;
	int res;

	if ((tmppath = lalloc(ud, NULL, 0, path_len)) == NULL)
		return pusherror(L, "lalloc");
	strcpy(tmppath, path);
	res = mkstemp(tmppath);

	if (res != -1)
	{
		lua_pushinteger(L, res);
		lua_pushstring(L, tmppath);
	}

	lalloc(ud, tmppath, path_len, 0);
	return (res == -1) ? pusherror(L, path) : 2;
}

/***
Create a unique temporary directory.
@function mkdtemp
@see mkdtemp(3)
@string templ pattern that ends in six 'X' characters
@return path on success, nil otherwise
@return error message if failed
*/
static int Pmkdtemp(lua_State *L)
{
	const char *path = luaL_checkstring(L, 1);
	size_t path_len = strlen(path) + 1;
	void *ud;
	lua_Alloc lalloc = lua_getallocf(L, &ud);
	char *tmppath;
	char *res;

	if ((tmppath = lalloc(ud, NULL, 0, path_len)) == NULL)
		return pusherror(L, "lalloc");
	strcpy(tmppath, path);

	if ((res = mkdtemp(tmppath)))
		lua_pushstring(L, tmppath);
	lalloc(ud, tmppath, path_len, 0);
	return (res == NULL) ? pusherror(L, path) : 1;
}

static int runexec(lua_State *L, int use_shell)
{
	char **argv;
	const char *path = luaL_checkstring(L, 1);
	int i,n=lua_gettop(L), table = 0;
	if (n >= 1 && lua_type(L, 2) == LUA_TTABLE) {
		n = lua_objlen(L, 2);
		table = 1;
	} else
		n--;
	argv = lua_newuserdata(L,(n+2)*sizeof(char*));

	/* Set argv[0], defaulting to command */
	argv[0] = (char*)path;
	if (table) {
		lua_pushinteger(L, 0);
		lua_gettable(L, 2);
		if (lua_type(L, -1) == LUA_TSTRING)
			argv[0] = (char*)lua_tostring(L, -1);
		else
			lua_pop(L, 1);
	}

	/* Read argv[1..n] from arguments or table. */
	for (i=1; i<=n; i++) {
		if (table) {
			lua_pushinteger(L, i);
			lua_gettable(L, 2);
			argv[i] = (char*)lua_tostring(L, -1);
		} else
			argv[i] = (char*)luaL_checkstring(L, i+1);
	}
	argv[n+1] = NULL;

	(use_shell?execvp:execv)(path, argv);
	return pusherror(L, path);
}

/***
Execute a program without using the shell.
@function exec
@see execve(2)
@string path
@param ... any arguments, or
@param t table of arguments (can include index 0)
@return return code, nil otherwise
@return error message if failed.
*/
static int Pexec(lua_State *L)
{
	return runexec(L, 0);
}

/***
Execute a program using the shell.
@function execp
@see execve(2)
@string path
@param ... any arguments, or
@param t table of arguments (can include index 0)
@return return code, nil otherwise
@return error message if failed.
*/
static int Pexecp(lua_State *L)
{
	return runexec(L, 1);
}

/***
Fork this program.
@function fork
@see fork(2)
@see fork.lua
@see fork2.lua
@return return code, nil otherwise
@return error message if failed.
*/
static int Pfork(lua_State *L)
{
	return pushresult(L, fork(), NULL);
}

/***
Terminate the calling process.
@function _exit
@see _exit(2)
@int return status
*/
static int P_exit(lua_State *L)
{
	pid_t ret = luaL_checkint(L, 1);
	_exit(ret);
	return 0; /* Avoid a compiler warning (or possibly cause one
		     if the compiler's too clever, sigh). */
}

/***
Wait for some event on a file descriptor.
Adapted from http://lua-users.org/lists/lua-l/2007-11/msg00346.html
@function rpoll
@int file descriptor
@int timeout
@see poll(2)
@return return code, nil otherwise
@return error message if failed.
*/
static int Prpoll(lua_State *L)
{
	struct pollfd fds;
	int file = luaL_checkint(L,1);
	int timeout = luaL_checkint(L,2);
	fds.fd = file;
	fds.events = POLLIN;
	return pushresult(L, poll(&fds,1,timeout), NULL);
}

static struct {
	short       bit;
	const char *name;
} Ppoll_event_map[] = {
#define MAP(_NAME) \
	{POLL##_NAME, #_NAME}
	MAP(IN),
	MAP(PRI),
	MAP(OUT),
	MAP(ERR),
	MAP(HUP),
	MAP(NVAL),
#undef MAP
};

#define PPOLL_EVENT_NUM (sizeof(Ppoll_event_map) / sizeof(*Ppoll_event_map))

static void Ppoll_events_createtable(lua_State *L)
{
	lua_createtable(L, 0, PPOLL_EVENT_NUM);
}

static short Ppoll_events_from_table(lua_State *L, int table)
{
	short   events  = 0;
	size_t  i;

	/* Convert to absolute index */
	if (table < 0)
		table = lua_gettop(L) + table + 1;

	for (i = 0; i < PPOLL_EVENT_NUM; i++)
	{
		lua_getfield(L, table, Ppoll_event_map[i].name);
		if (lua_toboolean(L, -1))
			events |= Ppoll_event_map[i].bit;
		lua_pop(L, 1);
	}

	return events;
}

static void Ppoll_events_to_table(lua_State *L, int table, short events)
{
	size_t  i;

	/* Convert to absolute index */
	if (table < 0)
		table = lua_gettop(L) + table + 1;

	for (i = 0; i < PPOLL_EVENT_NUM; i++)
	{
		lua_pushboolean(L, events & Ppoll_event_map[i].bit);
		lua_setfield(L, table, Ppoll_event_map[i].name);
	}
}

static nfds_t Ppoll_fd_list_check_table(lua_State  *L,
					int         table)
{
	nfds_t          fd_num      = 0;

	/*
	 * Assume table is an argument number.
	 * Should be an assert(table > 0).
	 */

	luaL_checktype(L, table, LUA_TTABLE);

	/* Nil key - the one before first */
	lua_pushnil(L);

	/* Push each key/value pair, popping previous key */
	while (lua_next(L, 1) != 0)
	{
		/* Verify the fd key */
		luaL_argcheck(L, lua_isnumber(L, -2), table,
					  "contains non-integer key(s)");

		/* Verify the table value */
		luaL_argcheck(L, lua_istable(L, -1), table,
					  "contains non-table value(s)");
		lua_getfield(L, -1, "events");
		luaL_argcheck(L, lua_istable(L, -1), table,
					  "contains invalid value table(s)");
		lua_pop(L, 1);
		lua_getfield(L, -1, "revents");
		luaL_argcheck(L, lua_isnil(L, -1) || lua_istable(L, -1), table,
					  "contains invalid value table(s)");
		lua_pop(L, 1);

		/* Remove value (but leave the key) */
		lua_pop(L, 1);

		/* Count the fds */
		fd_num++;
	}

	return fd_num;
}

static void Ppoll_fd_list_from_table(lua_State         *L,
				     int                table,
				     struct pollfd     *fd_list)
{
	struct pollfd  *pollfd  = fd_list;

	/*
	 * Assume the table didn't change since
	 * the call to Ppoll_fd_list_check_table
	 */

	/* Convert to absolute index */
	if (table < 0)
		table = lua_gettop(L) + table + 1;

	/* Nil key - the one before first */
	lua_pushnil(L);

	/* Push each key/value pair, popping previous key */
	while (lua_next(L, table) != 0)
	{
		/* Transfer the fd key */
		pollfd->fd = lua_tointeger(L, -2);

		/* Transfer "events" field from the value */
		lua_getfield(L, -1, "events");
		pollfd->events = Ppoll_events_from_table(L, -1);
		lua_pop(L, 1);

		/* Remove value (but leave the key) */
		lua_pop(L, 1);

		/* Proceed to next fd */
		pollfd++;
	}
}

static void Ppoll_fd_list_to_table(lua_State           *L,
				   int                  table,
				   const struct pollfd *fd_list)
{
	const struct pollfd    *pollfd  = fd_list;

	/*
	 * Assume the table didn't change since
	 * the call to Ppoll_fd_list_check_table.
	 */

	/* Convert to absolute index */
	if (table < 0)
		table = lua_gettop(L) + table + 1;

	/* Nil key - the one before first */
	lua_pushnil(L);

	/* Push each key/value pair, popping previous key */
	while (lua_next(L, 1) != 0)
	{
		/* Transfer "revents" field to the value */
		lua_getfield(L, -1, "revents");
		if (lua_isnil(L, -1))
		{
			lua_pop(L, 1);
			Ppoll_events_createtable(L);
			lua_pushvalue(L, -1);
			lua_setfield(L, -3, "revents");
		}
		Ppoll_events_to_table(L, -1, pollfd->revents);
		lua_pop(L, 1);

		/* Remove value (but leave the key) */
		lua_pop(L, 1);

		/* Proceed to next fd */
		pollfd++;
	}
}

/***
Wait for events on multiple file descriptors.
@function poll
@param list of file descriptors
@int timeout optional (default -1)
@see poll(2)
@see poll.lua
@return return code, nil otherwise
@return error message if failed.
*/
static int Ppoll(lua_State *L)
{
	struct pollfd   static_fd_list[16];
	struct pollfd  *fd_list;
	nfds_t          fd_num;
	int             timeout;
	int             result;

	fd_num = Ppoll_fd_list_check_table(L, 1);
	timeout = luaL_optint(L, 2, -1);

	fd_list = (fd_num <= sizeof(static_fd_list) / sizeof(*static_fd_list))
					? static_fd_list
					: lua_newuserdata(L, sizeof(*fd_list) * fd_num);


	Ppoll_fd_list_from_table(L, 1, fd_list);

	result = poll(fd_list, fd_num, timeout);

	/* If any of the descriptors changed state */
	if (result > 0)
		Ppoll_fd_list_to_table(L, 1, fd_list);

	return pushresult(L, result, NULL);
}

/***
Wait for the given process.
@function wait
@see waitpid(2)
@int pid optional (default -1 (any child process))
@return pid of terminated child, nil on error
@return how child ended ("exited", "killed" or "stopped"), or error message on error.
@return status value (computed with WEXITSTATUS, WTERMSIG or WSTOPSIG as appropriate), or nothing on error.
*/
static int Pwait(lua_State *L)
{
	int status = 0;
	pid_t pid = luaL_optint(L, 1, -1);
	int options = luaL_optint(L, 2, 0);

	pid = waitpid(pid, &status, options);
	if (pid == -1)
		return pusherror(L, NULL);
	lua_pushinteger(L, pid);
	if (WIFEXITED(status))
	{
		lua_pushliteral(L,"exited");
		lua_pushinteger(L, WEXITSTATUS(status));
		return 3;
	}
	else if (WIFSIGNALED(status))
	{
		lua_pushliteral(L,"killed");
		lua_pushinteger(L, WTERMSIG(status));
		return 3;
	}
	else if (WIFSTOPPED(status))
	{
		lua_pushliteral(L,"stopped");
		lua_pushinteger(L, WSTOPSIG(status));
		return 3;
	}
	return 1;
}

/***
Send a signal to the given process.
@function kill
@see kill(2)
@int pid process id
@int sig optional (default SIGTERM)
@return return code, nil otherwise
@return error message if failed.
*/
static int Pkill(lua_State *L)
{
	pid_t pid = luaL_checkint(L, 1);
	int sig = luaL_optint(L, 2, SIGTERM);
	return pushresult(L, kill(pid, sig), NULL);
}

/***
Send a signal to the given process group.
@function killpg
@see killpg(2)
@int pgrp group id
@int sig optional (default SIGTERM)
@return return code, nil otherwise
@return error message if failed.
*/
static int Pkillpg(lua_State *L)
{
	int pgrp = luaL_checkint(L, 1);
	int sig = luaL_optint(L, 2, SIGTERM);
	return pushresult(L, killpg(pgrp, sig), NULL);
}

/***
Set the uid, euid, gid, egid, sid or pid & gid.
@function setpid
@see setuid(2)
@see seteuid(2)
@see setgid(2)
@see setegid(2)
@see setsid(2)
@see setpgid(2)
@string what one of 'u', 'U', 'g', 'G', 's', 'p' (upper-case means "effective")
@param id (uid, gid or pid for every value of `what` except 's')
@param gid (only for `what` value 'p')
@return 0 on success, nil otherwise
@return error message if failed
*/
static int Psetpid(lua_State *L)
{
	const char *what=luaL_checkstring(L, 1);
	switch (*what)
	{
		case 'U':
			return pushresult(L, seteuid(mygetuid(L, 2)), NULL);
		case 'u':
			return pushresult(L, setuid(mygetuid(L, 2)), NULL);
		case 'G':
			return pushresult(L, setegid(mygetgid(L, 2)), NULL);
		case 'g':
			return pushresult(L, setgid(mygetgid(L, 2)), NULL);
		case 's':
			return pushresult(L, setsid(), NULL);
		case 'p':
		{
			pid_t pid  = luaL_checkint(L, 2);
			pid_t pgid = luaL_checkint(L, 3);
			return pushresult(L, setpgid(pid,pgid), NULL);
		}
		default:
			badoption(L, 2, "id", *what);
			return 0;
	}
}

/***
Sleep for a number of seconds.
@function sleep
@see sleep(3)
@int seconds
@return code
*/
static int Psleep(lua_State *L)
{
	unsigned int seconds = luaL_checkint(L, 1);
	lua_pushinteger(L, sleep(seconds));
	return 1;
}

/***
Sleep with nanosecond precision.
@function nanosleep
@see nanosleep(2)
@int seconds
@int nanoseconds
@return 0 on success, nil otherwise
@return error message if failed, or the remaining time as two
results `tv_sec`, `tv_nsec` if return value is `EINTR`.
*/
static int Pnanosleep(lua_State *L)
{
	struct timespec req;
	struct timespec rem;
	int ret;
	req.tv_sec = luaL_checkint(L, 1);
	req.tv_nsec = luaL_checkint(L, 2);
	ret = pushresult (L, nanosleep(&req, &rem), NULL);
	if (ret == 3 && errno == EINTR)
	{
		lua_pushinteger (L, rem.tv_sec);
		lua_pushinteger (L, rem.tv_nsec);
		ret += 2;
	}
	return ret;
}

/***
Get a message queue identifier
@function msgget
@see msgget(2)
@int key
@int flags (optional, default - 0)
@int mode (optional, default - 0777)
@return message queue identifier on success
@return nil and error message if failed
 */
static int Pmsgget(lua_State *L)
{
	mode_t mode;
	const char *modestr;
	key_t key = luaL_checkint(L, 1);
	int msgflg = luaL_optint(L, 2, 0);

	modestr = luaL_optstring(L, 3,"rwxrwxrwx");
	if (mode_munch(&mode, modestr)) {
		luaL_argerror(L, 2, "bad mode");
	}
	msgflg |= mode;

	return pushresult(L, msgget(key, msgflg), NULL);
}

/***
Send message to a message queue
@function msgsnd
@see msgsnd(2)
@int id - message queue identifier returned by msgget
@int type - message type
@string message
@int flags (optional, default - 0)
@return 0 on success
@return nil and error message if failed
 */
static int Pmsgsnd(lua_State *L)
{
	void *ud;
	lua_Alloc lalloc = lua_getallocf(L, &ud);
	struct {
		long mtype;
		char mtext[0];
	} *msg;
	size_t len;
	size_t msgsz;
	ssize_t res;

	int msgid = luaL_checkint(L, 1);
	long msgtype = luaL_checklong(L, 2);
	const char *msgp = luaL_checklstring(L, 3, &len);
	int msgflg = luaL_optint(L, 4, 0);

	msgsz = sizeof(long) + len;

	if ((msg = lalloc(ud, NULL, 0, msgsz)) == NULL)
		return pusherror(L, "lalloc");

	msg->mtype = msgtype;
	memcpy(msg->mtext, msgp, len);

	res = msgsnd(msgid, msg, msgsz, msgflg);
	lua_pushinteger(L, res);

	lalloc(ud, msg, msgsz, 0);

	return (res == -1 ? pusherror(L, NULL) : 1);
}

/***
Receive message from a message queue
@function msgrcv
@see msgrcv(2)
@int id - message queue identifier returned by msgget
@int size - maximum message size
@int type - message type (optional, default - 0)
@int flags (optional, default - 0)
@return message type and message text on success
@return nil, nil and error message if failed
 */
static int Pmsgrcv(lua_State *L)
{
	int msgid = luaL_checkint(L, 1);
	size_t msgsz = luaL_checkint(L, 2);
	long msgtyp = luaL_optint(L, 3, 0);
	int msgflg = luaL_optint(L, 4, 0);

	void *ud;
	lua_Alloc lalloc = lua_getallocf(L, &ud);
	struct {
		long mtype;
		char mtext[0];
	} *msg;

	if ((msg = lalloc(ud, NULL, 0, msgsz)) == NULL)
		return pusherror(L, "lalloc");

	int res = msgrcv(msgid, msg, msgsz, msgtyp, msgflg);
	if (res != -1) {
		lua_pushinteger(L, msg->mtype);
		lua_pushlstring(L, msg->mtext, res - sizeof(long));
	}
	lalloc(ud, msg, msgsz, 0);

	return (res == -1) ? pusherror(L, NULL) : 2;
}

/***
Set an environment variable for this process.
(Child processes will inherit this)
@function setenv
@see setenv(3)
@string name
@string value (maybe nil, meaning 'unset')
@param over non-nil prevents overwriting a variable
@return 0 on success, nil otherwise
@return error message if failed.
*/
static int Psetenv(lua_State *L)
{
	const char *name=luaL_checkstring(L, 1);
	const char *value=luaL_optstring(L, 2, NULL);
	if (value==NULL)
	{
		unsetenv(name);
		return pushresult(L, 0, NULL);
	}
	else
	{
		int overwrite=lua_isnoneornil(L, 3) || lua_toboolean(L, 3);
		return pushresult(L, setenv(name,value,overwrite), NULL);
	}
}

/***
Get value of environment variable, or _all_ variables.
@function getenv
@see getenv(3)
@string name if nil, get all
@return value if name given, otherwise a name-indexed table of values.
@usage for a,b in pairs(posix.getenv()) do print(a, b) end
*/
static int Pgetenv(lua_State *L)
{
	if (lua_isnone(L, 1))
	{
		extern char **environ;
		char **e;
		lua_newtable(L);
		for (e=environ; *e!=NULL; e++)
		{
			char *s=*e;
			char *eq=strchr(s, '=');
			if (eq==NULL)		/* will this ever happen? */
			{
				lua_pushstring(L,s);
				lua_pushboolean(L,1);
			}
			else
			{
				lua_pushlstring(L,s,eq-s);
				lua_pushstring(L,eq+1);
			}
			lua_settable(L,-3);
		}
	}
	else
		lua_pushstring(L, getenv(luaL_checkstring(L, 1)));
	return 1;
}

/***
Set file mode creation mask.
@function umask
@see umask(2)
@see chmod
@string mode optional file creation mask string (default current mask; see chmod for format)
@return previous umask
*/
static int Pumask(lua_State *L)
{
	mode_t mode;
	umask(mode=umask(0));
	mode=(~mode)&0777;
	if (!lua_isnone(L, 1))
	{
		if (mode_munch(&mode, luaL_checkstring(L, 1)))
		{
			lua_pushnil(L);
			return 1;
		}
		mode&=0777;
		umask(~mode);
	}
	pushmode(L, mode);
	return 1;
}

/***
Open a pseudoterminal.
@function openpt
@see posix_openpt(3)
@int oflags bitwise OR of the values `O_RDWR`,
and possibly `O_NOCTTY` (all in the library's namespace)
@return file descriptor on success, nil otherwise
@return error message if failed.
@see grantpt
@see ptsname
@see unlockpt
*/
static int Popenpt(lua_State *L)
{
	int flags = luaL_checkint(L, 1);
	/* The name of the pseudo-device is specified by POSIX */
	return pushresult(L, open("/dev/ptmx", flags), NULL);
}

/***
Grant access to a slave pseudoterminal
@function grantpt
@param file descriptor returned by opening /dev/ptmx
@return 0 on success
@return nil, error message if failed.
@see openpt
@see ptsname
@see unlockpt
*/
static int Pgrantpt(lua_State *L)
{
    int fd=luaL_checkint(L, 1);
    return pushresult(L, grantpt(fd), "grantpt");
}

/***
Unlock a pseudoterminal master/slave pair
@function unlockpt
@param file descriptor returned by opening /dev/ptmx
@return 0 on success
@return nil, error message if failed.
@see openpt
@see ptsname
@see grantpt
*/
static int Punlockpt(lua_State *L)
{
    int fd=luaL_checkint(L, 1);
    return pushresult(L, unlockpt(fd), "unlockpt");
}

/***
Get the name of a slave pseudo-terminal
@function ptsname
@param file descriptor returned by opening /dev/ptmx
@return path name of the slave terminal device
@return nil, error message if failed.
@see openpt
@see grantpt
@see unlockpt
*/
static int Pptsname(lua_State *L)
{
    int fd=luaL_checkint(L, 1);
    const char* slave = ptsname(fd);
    if(!slave)
        return pusherror(L, "getptsname");
    lua_pushstring(L, slave);
    return 1;
}

/***
Open a file.
@function open
@see open(2)
@see chmod
@string path
@int oflags bitwise OR of the values `O_RDONLY`, `O_WRONLY`, `O_RDWR`,
`O_APPEND`, `O_CREAT`, `O_DSYNC`, `O_EXCL`, `O_NOCTTY`, `O_NONBLOCK`, `O_RSYNC`,
`O_SYNC`, `O_TRUNC` (all in the library's namespace)
@string mode (used with `O_CREAT`; see chmod for format)
@return file descriptor on success, nil otherwise
@return error message if failed.
*/
static int Popen(lua_State *L)
{
	const char *path = luaL_checkstring(L, 1);
	int flags = luaL_checkint(L, 2);
	mode_t mode;
	if (flags & O_CREAT) {
		const char *modestr = luaL_checkstring(L, 3);
		if (mode_munch(&mode, modestr))
			luaL_argerror(L, 3, "bad mode");
	}
	return pushresult(L, open(path, flags, mode), path);
}

/***
Close an open file descriptor.
@function close
@see close(2)
@int fd
@return 0 on success, nil otherwise
@return error message if failed.
*/
static int Pclose(lua_State *L)
{
	int fd = luaL_checkint(L, 1);
	return pushresult(L, close(fd), NULL);
}

/***
Duplicate an open file descriptor.
@function dup
@see dup(2)
@int fd
@return file descriptor on success, nil otherwise
@return error message if failed.
*/
static int Pdup(lua_State *L)
{
	int fd = luaL_checkint(L, 1);
	return pushresult(L, dup(fd), NULL);
}

/***
Duplicate one open file descriptor to another, closing the new one if necessary.
@function dup2
@see dup2(2)
@int oldfd
@int newfd
@return new file descriptor on success, nil otherwise
@return error message if failed.
*/
static int Pdup2(lua_State *L)
{
	int oldfd = luaL_checkint(L, 1);
	int newfd = luaL_checkint(L, 2);
	return pushresult(L, dup2(oldfd, newfd), NULL);
}

/***
Creates a pipe.
@function pipe
@see pipe(2)
@return fd read end
@return fd write end
@see fork.lua
*/
static int Ppipe(lua_State *L)
{
	int pipefd[2];
	int rc = pipe(pipefd);
	if(rc < 0)
		return pusherror(L, "pipe");
	lua_pushinteger(L, pipefd[0]);
	lua_pushinteger(L, pipefd[1]);
	return 2;
}

/***
Change the mode of the path.
Modes are specified in one of the following formats:

 * "rwxrwxrwx" (e.g. "rw-rw-w--")
 * "ugoa+-=rwx" (e.g. "u+w")
 * "+-=rwx" (e.g. "+w")

@function chmod
@see chmod(2)
@string path existing file path
@string mode
@return 0 on success, nil otherwise
@return error message if failed.
@usage posix.chmod('bin/dof','+x')
*/
static int Pchmod(lua_State *L)
{
	mode_t mode;
	struct stat s;
	const char *path = luaL_checkstring(L, 1);
	const char *modestr = luaL_checkstring(L, 2);
	if (stat(path, &s))
		return pusherror(L, path);
	mode = s.st_mode;
	if (mode_munch(&mode, modestr))
		luaL_argerror(L, 2, "bad mode");
	return pushresult(L, chmod(path, mode), path);
}

/***
Read bytes from a file.
@function read
@see read(2)
@int fd the file descriptor
@int count number of bytes to read
@return string with at most `count` bytes, or nil on error
@return error message if failed
*/
static int Pread(lua_State *L)
{
	int fd = luaL_checkint(L, 1);
	int count = luaL_checkint(L, 2), ret;
	void *ud, *buf;
	lua_Alloc lalloc = lua_getallocf(L, &ud);

	/* Reset errno in case lalloc doesn't set it */
	errno = 0;
	if ((buf = lalloc(ud, NULL, 0, count)) == NULL && count > 0)
		return pusherror(L, "lalloc");

	ret = read(fd, buf, count);
	if (ret >= 0)
		lua_pushlstring(L, buf, ret);
	lalloc(ud, buf, count, 0);
	return (ret < 0) ? pusherror(L, NULL) : 1;
}

/***
Write bytes to a file.
@function write
@see write(2)
@int fd the file descriptor
@string buf containing bytes
@return number of bytes written on success, nil otherwise
@return error message if failed.
*/
static int Pwrite(lua_State *L)
{
	int fd = luaL_checkint(L, 1);
	const char *buf = luaL_checkstring(L, 2);
	return pushresult(L, write(fd, buf, lua_objlen(L, 2)), NULL);
}

/***
Change ownership of a file.
@function chown
@see chown(2)
@string path existing file path
@param uid (string or number)
@param gid (string or number)
@return 0 on success, nil otherwise
@return error message if failed.
@usage print(posix.chown("/etc/passwd",100,200)) -- will fail for a normal user, and hence print an error
*/
static int Pchown(lua_State *L)
{
	const char *path = luaL_checkstring(L, 1);
	uid_t uid = mygetuid(L, 2);
	gid_t gid = mygetgid(L, 3);
	return pushresult(L, chown(path, uid, gid), path);
}

/***
Change file last access and modification times.
@function utime
@see utime(2)
@string path existing file path
@int mtime optional modification time (default current time)
@int atime optional access time (default current time)
@return 0 on success, nil otherwise
@return error message if failed.
*/
static int Putime(lua_State *L)
{
	struct utimbuf times;
	time_t currtime = time(NULL);
	const char *path = luaL_checkstring(L, 1);
	times.modtime = luaL_optnumber(L, 2, currtime);
	times.actime  = luaL_optnumber(L, 3, currtime);
	return pushresult(L, utime(path, &times), path);
}


static void FgetID(lua_State *L, int i, const void *UNUSED (data))
{
	switch (i)
	{
	case 0:
		lua_pushinteger(L, getegid());
		break;
	case 1:
		lua_pushinteger(L, geteuid());
		break;
	case 2:
		lua_pushinteger(L, getgid());
		break;
	case 3:
		lua_pushinteger(L, getuid());
		break;
	case 4:
		lua_pushinteger(L, getpgrp());
		break;
	case 5:
		lua_pushinteger(L, getpid());
		break;
	case 6:
		lua_pushinteger(L, getppid());
		break;
	}
}

static const char *const SgetID[] =
{
	"egid", "euid", "gid", "uid", "pgrp", "pid", "ppid", NULL
};

/***
Get process identifiers.
@function getpid
@string ... types, each one of "egid", "euid", "gid", "uid", "pgrp", "pid", "ppid"
@return ... values, or table of all ids if no option given
@usage posix.getpid 'pid' -- PID of current process
*/
static int Pgetpid(lua_State *L)
{
	return doselection(L, 1, SgetID, FgetID, NULL);
}

/***
Get host id.
@function hostid
@see gethostid(3)
@return host id
*/
static int Phostid(lua_State *L)
{
	lua_pushinteger(L, gethostid());
	return 1;
}

/***
Name of a terminal device.
@function ttyname
@see ttyname(3)
@int fd optional file descriptor (default 0)
@return string name
*/
static int Pttyname(lua_State *L)
{
	int fd=luaL_optint(L, 1, 0);
	lua_pushstring(L, ttyname(fd));
	return 1;
}

/***
Name of controlling terminal.
@function ctermid
@see ctermid(3)
@return code
*/
static int Pctermid(lua_State *L)
{
	char b[L_ctermid];
	lua_pushstring(L, ctermid(b));
	return 1;
}

/***
Current logged-in user.
@see getlogin(3)
@return string name, or nil if login name cannot be determined
*/
static int Pgetlogin(lua_State *L)
{
	lua_pushstring(L, getlogin());
	return 1;
}

static void Fgetpasswd(lua_State *L, int i, const void *data)
{
	const struct passwd *p=data;
	switch (i)
	{
	case 0:
		lua_pushstring(L, p->pw_name);
		break;
	case 1:
		lua_pushinteger(L, p->pw_uid);
		break;
	case 2:
		lua_pushinteger(L, p->pw_gid);
		break;
	case 3:
		lua_pushstring(L, p->pw_dir);
		break;
	case 4:
		lua_pushstring(L, p->pw_shell);
		break;
	case 5:
		lua_pushstring(L, p->pw_passwd);
		break;
	}
}

static const char *const Sgetpasswd[] =
{
	"name", "uid", "gid", "dir", "shell", "passwd", NULL
};


/***
Get the password entry for a user.
@function getpasswd
@param user (name or id)
@string ... field names, each one of "uid", "name", "gid", "passwd", "dir", "shell"
@return ... values, or table of all fields if no option given
@usage for a,b in pairs(posix.getpasswd("root")) do print(a,b) end
@usage print(posix.getpasswd("root", "shell"))
*/
static int Pgetpasswd(lua_State *L)
{
	struct passwd *p=NULL;
	if (lua_isnoneornil(L, 1))
		p = getpwuid(geteuid());
	else if (lua_isnumber(L, 1))
		p = getpwuid((uid_t)lua_tonumber(L, 1));
	else if (lua_isstring(L, 1))
		p = getpwnam(lua_tostring(L, 1));
	else
		luaL_typerror(L, 1, "string or number");
	if (p==NULL)
		lua_pushnil(L);
	else
		return doselection(L, 2, Sgetpasswd, Fgetpasswd, p);
	return 1;
}

/***
Information about a group.
@function getgroup
@param group id or name
@return table `{name=name,gid=gid,0=member0,1=member1,...}`
*/
static int Pgetgroup(lua_State *L)
{
	struct group *g = NULL;
	if (lua_isnumber(L, 1))
		g = getgrgid((gid_t)lua_tonumber(L, 1));
	else if (lua_isstring(L, 1))
		g = getgrnam(lua_tostring(L, 1));
	else
		luaL_typerror(L, 1, "string or number");
	if (g == NULL)
		lua_pushnil(L);
	else {
		int i;
		lua_newtable(L);
		lua_pushstring(L, g->gr_name);
		lua_setfield(L, -2, "name");
		lua_pushinteger(L, g->gr_gid);
		lua_setfield(L, -2, "gid");
		for (i = 0; g->gr_mem[i] != NULL; i++)
		{
			lua_pushstring(L, g->gr_mem[i]);
			lua_rawseti(L, -2, i + 1);
		}
	}
	return 1;
}

#if _POSIX_VERSION >= 200112L
/***
Get list of supplementary group IDs.
@function getgroups
@see getgroups(2)
@return table of group IDs.
*/
static int Pgetgroups(lua_State *L)
{
	int n_group_slots = getgroups(0, NULL);

	if (n_group_slots < 0)
		return pusherror(L, NULL);
	else if (n_group_slots == 0)
		lua_newtable(L);
	else {
		gid_t  *group;
		int     n_groups;
		int     i;

		group = lua_newuserdata(L, sizeof(*group) * n_group_slots);

		n_groups = getgroups(n_group_slots, group);
		if (n_groups < 0)
			return pusherror(L, NULL);

		lua_createtable(L, n_groups, 0);
		for (i = 0; i < n_groups; i++) {
			lua_pushinteger(L, group[i]);
			lua_rawseti(L, -2, i + 1);
		}
	}

	return 1;
}
#endif

struct mytimes
{
 struct tms t;
 clock_t elapsed;
};

#define pushtime(L,x)	lua_pushnumber(L, ((lua_Number)x)/clk_tck)

static void Ftimes(lua_State *L, int i, const void *data)
{
    static long clk_tck = 0;
	const struct mytimes *t=data;

    if( !clk_tck){ clk_tck= sysconf(_SC_CLK_TCK);}
	switch (i)
	{
		case 0: pushtime(L, t->t.tms_utime); break;
		case 1: pushtime(L, t->t.tms_stime); break;
		case 2: pushtime(L, t->t.tms_cutime); break;
		case 3: pushtime(L, t->t.tms_cstime); break;
		case 4: pushtime(L, t->elapsed); break;
	}
}

static const char *const Stimes[] =
{
	"utime", "stime", "cutime", "cstime", "elapsed", NULL
};

/***
Get the current process times.
@function times
@see times(2)
@string ... field names, each one of "utime", "stime", "cutime", "cstime", "elapsed"
@return ... times, or table of all times if no option given
*/
static int Ptimes(lua_State *L)
{
	struct mytimes t;
	t.elapsed = times(&t.t);
	return doselection(L, 1, Stimes, Ftimes, &t);
}


static const char *filetype(mode_t m)
{
	if (S_ISREG(m))
		return "regular";
	else if (S_ISLNK(m))
		return "link";
	else if (S_ISDIR(m))
		return "directory";
	else if (S_ISCHR(m))
		return "character device";
	else if (S_ISBLK(m))
		return "block device";
	else if (S_ISFIFO(m))
		return "fifo";
	else if (S_ISSOCK(m))
		return "socket";
	else
		return "?";
}

static void Fstat(lua_State *L, int i, const void *data)
{
	const struct stat *s=data;
	switch (i)
	{
	case 0:
		pushmode(L, s->st_mode);
		break;
	case 1:
		lua_pushinteger(L, s->st_ino);
		break;
	case 2:
		lua_pushinteger(L, s->st_dev);
		break;
	case 3:
		lua_pushinteger(L, s->st_nlink);
		break;
	case 4:
		lua_pushinteger(L, s->st_uid);
		break;
	case 5:
		lua_pushinteger(L, s->st_gid);
		break;
	case 6:
		lua_pushinteger(L, s->st_size);
		break;
	case 7:
		lua_pushinteger(L, s->st_atime);
		break;
	case 8:
		lua_pushinteger(L, s->st_mtime);
		break;
	case 9:
		lua_pushinteger(L, s->st_ctime);
		break;
	case 10:
		lua_pushstring(L, filetype(s->st_mode));
		break;
	}
}

static const char *const Sstat[] =
{
	"mode", "ino", "dev", "nlink", "uid", "gid",
	"size", "atime", "mtime", "ctime", "type",
	NULL
};

/***
Information about an existing file path.
@function stat
@see stat(2)
@string path file path
@string ... field names, each one of "mode", "ino", "dev", "nlink", "uid", "gid",
"size", "atime", "mtime", "ctime", "type"
@return ... values, or table of all fields if no option given
@usage for a, b in pairs(posix.stat("/etc/")) do print(a, b) end
*/
static int Pstat(lua_State *L)
{
	struct stat s;
	const char *path=luaL_checkstring(L, 1);
	if (lstat(path,&s)==-1)
		return pusherror(L, path);
	return doselection(L, 2, Sstat, Fstat, &s);
}

#if defined HAVE_STATVFS
static void Fstatvfs(lua_State *L, int i, const void *data)
{
	const struct statvfs *s=data;
	switch (i)
	{
	case 0:
		lua_pushinteger(L, s->f_bsize);
		break;
	case 1:
		lua_pushinteger(L, s->f_frsize);
		break;
	case 2:
		lua_pushnumber(L, s->f_blocks);
		break;
	case 3:
		lua_pushnumber(L, s->f_bfree);
		break;
	case 4:
		lua_pushnumber(L, s->f_bavail);
		break;
	case 5:
		lua_pushnumber(L, s->f_files);
		break;
	case 6:
		lua_pushnumber(L, s->f_ffree);
		break;
	case 7:
		lua_pushnumber(L, s->f_favail);
		break;
	case 8:
		lua_pushinteger(L, s->f_fsid);
		break;
	case 9:
		lua_pushinteger(L, s->f_flag);
		break;
	case 10:
		lua_pushinteger(L, s->f_namemax);
		break;
	}
}

static const char *const Sstatvfs[] =
{
	"bsize", "frsize", "blocks", "bfree", "bavail",
	"files", "ffree", "favail", "fsid", "flag", "namemax",
	NULL
};

/***
Get file system statistics.
@function statvfs
@see statvfs(3)
@string path any path within the mounted file system
@string ... field names, each one of "bsize", "frsize", "blocks", "bfree", "bavail",
"files", "ffree", "favail", "fsid", "flag", "namemax"
@return ... values, or table of all fields if no option given
*/
static int Pstatvfs(lua_State *L)
{
	struct statvfs s;
	const char *path=luaL_checkstring(L, 1);
	if (statvfs(path,&s)==-1)
		return pusherror(L, path);
	return doselection(L, 2, Sstatvfs, Fstatvfs, &s);
}
#endif

/***
Manipulate file descriptor.
@function fcntl
@see fcntl(2)
@see lock.lua
@int fd file descriptor to act on
@int cmd operation to perform
@param arg optional (default 0). Type and meaning of this param depends on `cmd`.
Currently it expects arg to be a table for file lock related `cmd` and a number
for all the rest. With file lock `cmd` the table should contain fields for flock
structure (see example). When function returns the fields of the table
get updated with corresponding values from flock structure (to comply
with semantics of F_GETLK).
@return integer return value depending on `cmd`, or nil on error
@return error message if failed
*/
static int Pfcntl(lua_State *L)
{
	int fd = luaL_optint(L, 1, 0);
	int cmd = luaL_checkint(L, 2);
	int arg;
	struct flock lockinfo;
	int result;
	switch (cmd) {
		case F_SETLK:
		case F_SETLKW:
		case F_GETLK:
			luaL_checktype(L, 3, LUA_TTABLE);

			/* Copy fields to flock struct */
			lua_getfield(L, 3, "l_type");
			lockinfo.l_type = (short)lua_tointeger(L, -1);
			lua_getfield(L, 3, "l_whence");
			lockinfo.l_whence = (short)lua_tointeger(L, -1);
			lua_getfield(L, 3, "l_start");
			lockinfo.l_start = (off_t)lua_tointeger(L, -1);
			lua_getfield(L, 3, "l_len");
			lockinfo.l_len = (off_t)lua_tointeger(L, -1);

			/* Lock */
			result = fcntl(fd, cmd, &lockinfo);

			/* Copy fields from flock struct */
			lua_pushinteger(L, lockinfo.l_type);
			lua_setfield(L, 3, "l_type");
			lua_pushinteger(L, lockinfo.l_whence);
			lua_setfield(L, 3, "l_whence");
			lua_pushinteger(L, lockinfo.l_start);
			lua_setfield(L, 3, "l_start");
			lua_pushinteger(L, lockinfo.l_len);
			lua_setfield(L, 3, "l_len");
			lua_pushinteger(L, lockinfo.l_pid);
			lua_setfield(L, 3, "l_pid");

			break;
		default:
			arg = luaL_optint(L, 3, 0);
			result = fcntl(fd, cmd, arg);
			break;
	}
	return pushresult(L, result, "fcntl");
}

/***
Test whether a file descriptor refers to a terminal.
@function isatty
@see isatty(3)
@int fd file descriptor to test
@return 1 if fd is an open file descriptor referring to a terminal, or nil otherwise
@return error message if failed
*/
static int Pisatty(lua_State *L)
{
	return pushresult(L, isatty(luaL_checkint(L, 1)) == 0 ? -1 : 1, "isatty");
}

/***
Return information about this machine.
@function uname
@see uname(2)
@string optional, contains zero or more of:

 * %m  machine name
 * %n  node name
 * %r  release
 * %s  sys name
 * %v  version

(default return all information available)
@return information string on success, nil otherwise
@return error message if failed
*/
static int Puname(lua_State *L)
{
	struct utsname u;
	luaL_Buffer b;
	const char *s;
	if (uname(&u)==-1)
		return pusherror(L, NULL);
	luaL_buffinit(L, &b);
	for (s=luaL_optstring(L, 1, "%s %n %r %v %m"); *s; s++)
		if (*s!='%')
			luaL_addchar(&b, *s);
		else switch (*++s)
		{
			case '%': luaL_addchar(&b, *s); break;
			case 'm': luaL_addstring(&b,u.machine); break;
			case 'n': luaL_addstring(&b,u.nodename); break;
			case 'r': luaL_addstring(&b,u.release); break;
			case 's': luaL_addstring(&b,u.sysname); break;
			case 'v': luaL_addstring(&b,u.version); break;
			default: badoption(L, 2, "format", *s); break;
		}
	luaL_pushresult(&b);
	return 1;
}

#define pathconf_map \
	MENTRY( _LINK_MAX         ) \
	MENTRY( _MAX_CANON        ) \
	MENTRY( _MAX_INPUT        ) \
	MENTRY( _NAME_MAX         ) \
	MENTRY( _PATH_MAX         ) \
	MENTRY( _PIPE_BUF         ) \
	MENTRY( _CHOWN_RESTRICTED ) \
	MENTRY( _NO_TRUNC         ) \
	MENTRY( _VDISABLE         )

static const int Kpathconf[] =
{
#define MENTRY(_f) LPOSIX_SPLICE(_PC, _f),
	pathconf_map
#undef MENTRY
	-1
};

static void Fpathconf(lua_State *L, int i, const void *data)
{
	const char *path=data;
	lua_pushinteger(L, pathconf(path, Kpathconf[i]));
}

static const char *const Spathconf[] =
{
#define MENTRY(_f) LPOSIX_STR_1(_f),
	pathconf_map
#undef MENTRY
	NULL
};

/***
Get a value for a configuration option for a filename.
@function pathconf
@see pathconf(3)
@string path optional (default ".")
@string ... field names, each one of "LINK_MAX", "MAX_CANON", "NAME_MAX", "PIPE_BUF",
"CHOWN_RESTRICTED", "NO_TRUNC", "VDISABLE"
@return ... values, or table of all fields if no option given
@usage for a, b in pairs(posix.pathconf("/dev/tty")) do print(a, b) end
*/
static int Ppathconf(lua_State *L)
{
	const char *path = luaL_optstring(L, 1, ".");
	return doselection(L, 2, Spathconf, Fpathconf, path);
}

#define sysconf_map \
	MENTRY( _ARG_MAX     ) \
	MENTRY( _CHILD_MAX   ) \
	MENTRY( _CLK_TCK     ) \
	MENTRY( _NGROUPS_MAX ) \
	MENTRY( _STREAM_MAX  ) \
	MENTRY( _TZNAME_MAX  ) \
	MENTRY( _OPEN_MAX    ) \
	MENTRY( _JOB_CONTROL ) \
	MENTRY( _SAVED_IDS   ) \
	MENTRY( _VERSION     )

static const int Ksysconf[] =
{
#define MENTRY(_f) LPOSIX_SPLICE(_SC, _f),
	sysconf_map
#undef MENTRY
	-1
};

static void Fsysconf(lua_State *L, int i, const void *UNUSED (data))
{
	lua_pushinteger(L, sysconf(Ksysconf[i]));
}

static const char *const Ssysconf[] =
{
#define MENTRY(_f) LPOSIX_STR_1(_f),
	sysconf_map
#undef MENTRY
	NULL
};

/***
Get configuration information at runtime.
@function sysconf
@see sysconf(3)
@string ... field names, each one of "ARG_MAX", "CHILD_MAX", "CLK_TCK", "NGROUPS_MAX",
"STREAM_MAX", "TZNAME_MAX", "OPEN_MAX", "JOB_CONTROL", "VERSION"
@return ... values, or table of all fields no option
*/
static int Psysconf(lua_State *L)
{
	return doselection(L, 1, Ssysconf, Fsysconf, NULL);
}

#if _POSIX_VERSION >= 200112L
/* syslog funcs */

/***
Open the system logger.
@function openlog
@see syslog(3)
@string ident all messages will start with this
@string option optional, any combination of 'c' (directly to system console if an error sending),
'n' (no delay) or 'p' (show PID)
@int facility optional (default LOG_USER)
*/
static int Popenlog(lua_State *L)
{
	const char *ident = luaL_checkstring(L, 1);
	int option = 0;
	int facility = luaL_optint(L, 3, LOG_USER);
	const char *s = luaL_optstring(L, 2, "");
	while (*s) {
		switch (*s) {
			case ' ': break;
			case 'c': option |= LOG_CONS; break;
			case 'n': option |= LOG_NDELAY; break;
			case 'p': option |= LOG_PID; break;
			default: badoption(L, 2, "option", *s); break;
		}
		s++;
	}
	openlog(ident, option, facility);
	return 0;
}

/***
Write to the system logger.
@function syslog
@see syslog(3)
@int priority one of these values:

 * 1  Alert - immediate action
 * 2  Critcal
 * 3  Error
 * 4  Warning
 * 5  Notice
 * 6  Informational

@string message
*/
static int Psyslog(lua_State *L)
{
	int priority = luaL_checkint(L, 1);
	const char *msg = luaL_checkstring(L, 2);
	syslog(priority, "%s", msg);
	return 0;
}

/***
Close system log.
@function closelog
@see syslog(3)
*/
static int Pcloselog(lua_State *UNUSED (L))
{
	closelog();
	return 0;
}

/***
Set log priority mask.
@function setlogmask
@int bitwise OR of values from `LOG_EMERG`, `LOG_ALERT`, `LOG_CRIT`, `LOG_WARNING`, `LOG_NOTICE`, `LOG_INFO`, `LOG_DEBUG`
@return 0 on success, nil otherwise
@return error message if failed.
*/
static int Psetlogmask(lua_State *L)
{
	int argno = lua_gettop(L);
	int mask = 0;
	int i;

	for (i=1; i <= argno; i++)
		mask |= LOG_MASK(luaL_checkint(L,i));

	return pushresult(L, setlogmask(mask),"setlogmask");
}
#endif

#if defined HAVE_CRYPT
/***
Encrypt a password.
Not recommended for general encryption purposes.
@function crypt
@see crypt(3)
@string string
@string salt two-character string from [a-zA-Z0-9./]
@return encrypted string
*/
static int Pcrypt(lua_State *L)
{
	const char *str, *salt;
	char *res;

	str = luaL_checkstring(L, 1);
	salt = luaL_checkstring(L, 2);
	if (strlen(salt) < 2)
		luaL_error(L, "not enough salt");

	res = crypt(str, salt);
	lua_pushstring(L, res);

	return 1;
}
#endif

/* get/setrlimit */
#define rlimit_map \
	MENTRY( _CORE   ) \
	MENTRY( _CPU    ) \
	MENTRY( _DATA   ) \
	MENTRY( _FSIZE  ) \
	MENTRY( _NOFILE ) \
	MENTRY( _STACK  ) \
	MENTRY( _AS     )

static const int Krlimit[] =
{
#define MENTRY(_f) LPOSIX_SPLICE(RLIMIT, _f),
	rlimit_map
#undef MENTRY
	-1
};

static const char *const Srlimit[] =
{
#define MENTRY(_f) LPOSIX_STR_1(_f),
	rlimit_map
#undef MENTRY
	NULL
};

/***
Set a resource limit for subsequent child processes.
@function setrlimit
@see getrlimit(2)
@see limit.lua
@string resource one of "core", "cpu", "data", "fsize",
 "nofile", "stack", "as"
@param softlimit optional (default keep current limit)
@param hardlimit optional (default keep current limit)
@return 0 on success, nil otherwise
@return error message if failed.
@usage posix.setrlimit("nofile", 1000, 2000)
*/
static int Psetrlimit(lua_State *L)
{
	int softlimit;
	int hardlimit;
	const char *rid_str;
	int rid = 0;
	struct rlimit lim;
	struct rlimit lim_current;
	int rc;

	rid_str = luaL_checkstring(L, 1);
	softlimit = luaL_optint(L, 2, -1);
	hardlimit = luaL_optint(L, 3, -1);
	rid = lookup_symbol(Srlimit, Krlimit, rid_str);

	if (softlimit < 0 || hardlimit < 0)
		if ((rc = getrlimit(rid, &lim_current)) < 0)
			return pushresult(L, rc, "getrlimit");

	if (softlimit < 0)
		lim.rlim_cur = lim_current.rlim_cur;
	else
		lim.rlim_cur = softlimit;
	if (hardlimit < 0)
		lim.rlim_max = lim_current.rlim_max;
	else lim.rlim_max = hardlimit;

	return pushresult(L, setrlimit(rid, &lim), "setrlimit");
}

/***
Get resource limits for this process.
@function getrlimit
@string resource one of "core", "cpu", "data", "fsize",
 "nofile", "stack", "as"
@return softlimit, or nil if error
@return hardlimit, or message on error
*/
static int Pgetrlimit(lua_State *L)
{
	struct rlimit lim;
	int rid, rc;
	const char *rid_str = luaL_checkstring(L, 1);
	rid = lookup_symbol(Srlimit, Krlimit, rid_str); /* FIXME: Use doselection. */
	rc = getrlimit(rid, &lim);
	if (rc < 0)
		return pusherror(L, "getrlimit");
	lua_pushinteger(L, lim.rlim_cur);
	lua_pushinteger(L, lim.rlim_max);
	return 2;
}


/* Time and date */

/***
Time and date.
@section timedate
*/

/***
Get time of day.
@function gettimeofday
@see gettimeofday(2)
@return time in seconds
@return remainder in nanoseconds
*/
static int Pgettimeofday(lua_State *L)
{
	struct timeval tv;
	if (gettimeofday(&tv, NULL) == -1)
		return pusherror(L, "gettimeofday");

	lua_newtable(L);
	lua_pushstring(L, "sec");
	lua_pushinteger(L, tv.tv_sec);
	lua_settable(L, -3);
	lua_pushstring(L, "usec");
	lua_pushinteger(L, tv.tv_usec);
	lua_settable(L, -3);
	return 1;
}

/***
Get current time.
@function time
@return time in seconds since epoch
*/
static int Ptime(lua_State *L)
{
	time_t t = time(NULL);
	if ((time_t)-1 == t)
		return pusherror(L, "time");
	lua_pushinteger(L, t);
	return 1;
}

/* N.B. In Lua broken-down time tables the month field is 1-based not
   0-based, and the year field is the full year, not years since
   1900. */

static void totm(lua_State *L, int n, struct tm *tp)
{
	luaL_checktype(L, n, LUA_TTABLE);
	lua_getfield(L, n, "sec");
	tp->tm_sec = luaL_optint(L, -1, 0);
	lua_pop(L, 1);
	lua_getfield(L, n, "min");
	tp->tm_min = luaL_optint(L, -1, 0);
	lua_pop(L, 1);
	lua_getfield(L, n, "hour");
	tp->tm_hour = luaL_optint(L, -1, 0);
	lua_pop(L, 1);
	/* For compatibility to Lua os.date() read "day" if "monthday"
		 does not yield a number */
	lua_getfield(L, n, "monthday");
	if (!lua_isnumber(L, -1))
		lua_getfield(L, n, "day");
	tp->tm_mday = luaL_optint(L, -1, 0);
	lua_pop(L, 1);
	lua_getfield(L, n, "month");
	tp->tm_mon = luaL_optint(L, -1, 0) - 1;
	lua_pop(L, 1);
	lua_getfield(L, n, "year");
	tp->tm_year = luaL_optint(L, -1, 0) - 1900;
	lua_pop(L, 1);
	lua_getfield(L, n, "weekday");
	tp->tm_wday = luaL_optint(L, -1, 0);
	lua_pop(L, 1);
	lua_getfield(L, n, "yearday");
	tp->tm_yday = luaL_optint(L, -1, 0);
	lua_pop(L, 1);
	lua_getfield(L, n, "is_dst");
	tp->tm_isdst = (lua_type(L, -1) == LUA_TBOOLEAN) ? lua_toboolean(L, -1) : 0;
	lua_pop(L, 1);
}

static void pushtm(lua_State *L, struct tm t)
{
	lua_createtable(L, 0, 10);
	lua_pushinteger(L, t.tm_sec);
	lua_setfield(L, -2, "sec");
	lua_pushinteger(L, t.tm_min);
	lua_setfield(L, -2, "min");
	lua_pushinteger(L, t.tm_hour);
	lua_setfield(L, -2, "hour");
	lua_pushinteger(L, t.tm_mday);
	lua_setfield(L, -2, "monthday");
	lua_pushinteger(L, t.tm_mday);
	lua_setfield(L, -2, "day");
	lua_pushinteger(L, t.tm_mon + 1);
	lua_setfield(L, -2, "month");
	lua_pushinteger(L, t.tm_year + 1900);
	lua_setfield(L, -2, "year");
	lua_pushinteger(L, t.tm_wday);
	lua_setfield(L, -2, "weekday");
	lua_pushinteger(L, t.tm_yday);
	lua_setfield(L, -2, "yearday");
	lua_pushboolean(L, t.tm_isdst);
	lua_setfield(L, -2, "is_dst");
}

/***
Convert time in seconds to table.
@function localtime
@param t time in seconds since epoch (default now)
@return time table: contains "is_dst","yearday","hour","min","year","month",
 "sec","weekday","monthday", "day" (the same as "monthday")
*/
static int Plocaltime(lua_State *L)
{
	struct tm res;
	time_t t = luaL_optint(L, 1, time(NULL));
	if (localtime_r(&t, &res) == NULL)
		return pusherror(L, "localtime");
	pushtm(L, res);
	return 1;
}

/***
Convert UTC time in seconds to table.
@function gmtime
@param t time in seconds since epoch (default now)
@return time table as in `localtime`
*/
static int Pgmtime(lua_State *L)
{
	struct tm res;
	time_t t = luaL_optint(L, 1, time(NULL));
	if (gmtime_r(&t, &res) == NULL)
		return pusherror(L, "localtime");
	pushtm(L, res);
	return 1;
}

#if defined _XOPEN_REALTIME && _XOPEN_REALTIME != -1
/* FIXME: Use numeric constants. */
static int get_clk_id_const(const char *str)
{
	if (str == NULL)
		return CLOCK_REALTIME;
	else if (STREQ (str, "monotonic"))
		return CLOCK_MONOTONIC;
	else if (STREQ (str, "process_cputime_id"))
		return CLOCK_PROCESS_CPUTIME_ID;
	else if (STREQ (str, "thread_cputime_id"))
		return CLOCK_THREAD_CPUTIME_ID;
	else
		return CLOCK_REALTIME;
}

/***
Find the precision of a clock.
@function clock_getres
@string name of clock, one of "monotonic", "process_cputime_id", or
"thread_cputime_id", or nil for realtime clock.
@return seconds, or nil on error
@return nanoseconds, or message on error
*/
static int Pclock_getres(lua_State *L)
{
	struct timespec res;
	const char *str = lua_tostring(L, 1);
	if (clock_getres(get_clk_id_const(str), &res) == -1)
		return pusherror(L, "clock_getres");
	lua_pushinteger(L, res.tv_sec);
	lua_pushinteger(L, res.tv_nsec);
	return 2;
}

/***
Read a clock.
@function clock_gettime
@string name of clock, one of "monotonic", "process_cputime_id", or
"thread_cputime_id", or nil for realtime clock.
@return seconds, or nil on error
@return nanoseconds, or message on error
*/
static int Pclock_gettime(lua_State *L)
{
	struct timespec res;
	const char *str = lua_tostring(L, 1);
	if (clock_gettime(get_clk_id_const(str), &res) == -1)
		return pusherror(L, "clock_gettime");
	lua_pushinteger(L, res.tv_sec);
	lua_pushinteger(L, res.tv_nsec);
	return 2;
}
#endif

/***
Write a time out according to a format.
@function strftime
@see strftime(3)
@param tm optional time table (e.g from `localtime`; default current time)
*/
static int Pstrftime(lua_State *L)
{
	char tmp[256];
	const char *format = luaL_checkstring(L, 1);

	struct tm t;
	if (lua_isnil(L, 2)) {
		time_t now = time(NULL);
		localtime_r(&now, &t);
	} else {
		totm(L, 2, &t);
	}

	strftime(tmp, sizeof(tmp), format, &t);
	lua_pushstring(L, tmp);
	return 1;
}

/***
Parse a date string.
@function strptime
@see strptime(3)
@string s
@string format same as for `strftime`
@usage posix.strptime('20','%d').monthday == 20
@return time table, like `localtime`
@return next index of first character not parsed as part of the date
*/
static int Pstrptime(lua_State *L)
{
	struct tm t;
	const char *s = luaL_checkstring(L, 1);
	const char *fmt = luaL_checkstring(L, 2);
	char *ret;

	memset(&t, 0, sizeof(struct tm));
	ret = strptime(s, fmt, &t);
	if (ret) {
		pushtm(L, t);
		lua_pushinteger(L, ret - s);
		return 2;
	} else
		return 0;
}

/***
Convert a time table into a time value.
@function mktime
@param tm time table as in `localtime`
@return time in seconds since epoch
*/
static int Pmktime(lua_State *L)
{
	struct tm t;
	time_t ret;
	totm(L, 1, &t);
	ret = mktime(&t);
	if (ret == -1)
		return 0;
	lua_pushinteger(L, ret);
	return 1;
}


/* getopt_long */

/* N.B. We don't need the symbolic constants no_argument,
   required_argument and optional_argument, since their values are
   defined as 0, 1 and 2 respectively. */
static const char *const arg_types[] = {
	"none", "required", "optional", NULL
};

static int iter_getopt_long(lua_State *L)
{
	int longindex = 0, ret, argc = lua_tointeger(L, lua_upvalueindex(1));
	char **argv = (char **)lua_touserdata(L, lua_upvalueindex(3));
	struct option *longopts = (struct option *)lua_touserdata(L, lua_upvalueindex(3 + argc + 1));

	if (argv == NULL) /* If we have already completed, return now. */
		return 0;

	/* Fetch upvalues to pass to getopt_long. */
	ret = getopt_long(argc, argv,
			  lua_tostring(L, lua_upvalueindex(2)),
			  longopts,
			  &longindex);
	if (ret == -1)
		return 0;
	else {
		char c = ret;
		lua_pushlstring(L, &c, 1);
		lua_pushstring(L, optarg);
		lua_pushinteger(L, optind);
		lua_pushinteger(L, longindex);
		return 4;
	}
}

/***
Parse command-line options.
@function getopt
@see getopt(3) / getopt_long()
@param arg command line arguments
@string shortopts e.g 'ho:v' (colon means 'receives argument')
@param longopts e.g. `{{'help','none',2},...}`
@usage for ret, longindex, optind, optarg in posix.getopt (arg, shortopts[, longopts[, opterr[, optind]]]) do ... end
@see getopt.lua
*/
static int Pgetopt(lua_State *L)
{
	int argc, i, n = 0;
	const char *shortopts;
	char **argv;
	struct option *longopts;

	luaL_checktype(L, 1, LUA_TTABLE);
	shortopts = luaL_checkstring(L, 2);
	if(!lua_isnone(L, 3) && !lua_isnil(L, 3)) luaL_checktype(L, 3, LUA_TTABLE);
	opterr = luaL_optinteger (L, 4, 0);
	optind = luaL_optinteger (L, 5, 1);

	argc = (int)lua_objlen(L, 1) + 1;

	lua_pushinteger(L, argc);

	lua_pushstring(L, shortopts);

	argv = lua_newuserdata(L, (argc + 1) * sizeof(char *));
	argv[argc] = NULL;
	for (i = 0; i < argc; i++) {
		lua_pushinteger(L, i);
		lua_gettable(L, 1);
		argv[i] = (char *)luaL_checkstring(L, -1);
	}

	if(lua_type(L, 3) == LUA_TTABLE) {
		n = (int)lua_objlen(L, 3);
	}
	longopts = lua_newuserdata(L, (n + 1) * sizeof(struct option));
	longopts[n].name = NULL;
	longopts[n].has_arg = 0;
	longopts[n].flag = NULL;
	longopts[n].val = 0;
	for (i = 1; i <= n; i++) {
		const char *name, *val;
		int has_arg;

		lua_pushinteger(L, i);
		lua_gettable(L, 3);
		luaL_checktype(L, -1, LUA_TTABLE);

		lua_pushinteger(L, 1);
		lua_gettable(L, -2);
		name = luaL_checkstring(L, -1);

		lua_pushinteger(L, 2);
		lua_gettable(L, -3);
		has_arg = luaL_checkoption(L, -1, NULL, arg_types);
		lua_pop(L, 1);

		lua_pushinteger(L, 3);
		lua_gettable(L, -3);
		val = luaL_checkstring(L, -1);
		lua_pop(L, 1);

		longopts[i - 1].name = name;
		longopts[i - 1].has_arg = has_arg;
		longopts[i - 1].flag = NULL;
		longopts[i - 1].val = val[0];
		lua_pop(L, 1);
	}

	/* Push remaining upvalues, and make and push closure. */
	lua_pushcclosure(L, iter_getopt_long, 4 + argc + n);

	return 1;
}


/* Signals */

static lua_State *signalL;
#define SIGNAL_QUEUE_MAX 25
static volatile sig_atomic_t signal_pending, defer_signal;
static volatile sig_atomic_t signal_count = 0;
static volatile sig_atomic_t signals[SIGNAL_QUEUE_MAX];

#define sigmacros_map \
	MENTRY( _DFL ) \
	MENTRY( _IGN )

static const char *const Ssigmacros[] =
{
#define MENTRY(_s) LPOSIX_STR_1(LPOSIX_SPLICE(_SIG, _s)),
	sigmacros_map
#undef MENTRY
	NULL
};

static void (*Fsigmacros[])(int) =
{
#define MENTRY(_s) LPOSIX_SPLICE(SIG, _s),
	sigmacros_map
#undef MENTRY
	NULL
};

static void sig_handle (lua_State *L, lua_Debug *ar) {
	/* Block all signals until we have run the Lua signal handler */
	sigset_t mask, oldmask;
	sigfillset(&mask);
	sigprocmask(SIG_SETMASK, &mask, &oldmask);

	(void)ar;  /* unused arg. */

	lua_sethook(L, NULL, 0, 0);

	/* Get signal handlers table */
	lua_pushlightuserdata(L, &signalL);
	lua_rawget(L, LUA_REGISTRYINDEX);

	/* Empty the signal queue */
	while (signal_count--) {
		sig_atomic_t signalno = signals[signal_count];
		/* Get handler */
		lua_pushinteger(L, signalno);
		lua_gettable(L, -2);

		/* Call handler with signal number */
		lua_pushinteger(L, signalno);
		if (lua_pcall(L, 1, 0, 0) != 0)
			fprintf(stderr,"error in signal handler %d: %s\n",signalno,lua_tostring(L,-1));
	}
	signal_count = 0;  /* reset global to initial state */

	/* Having run the Lua signal handler, restore original signal mask */
	sigprocmask(SIG_SETMASK, &oldmask, NULL);
}

static void sig_postpone (int i) {
    if (defer_signal) {
        signal_pending = i;
        return;
    }
    if (signal_count == SIGNAL_QUEUE_MAX)
        return;
    defer_signal++;
    /* Queue signals */
    signals[signal_count] = i;
    signal_count ++;
	lua_sethook(signalL, sig_handle, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
    defer_signal--;
    /* re-raise any pending signals */
    if (defer_signal == 0 && signal_pending != 0)
        raise (signal_pending);
}

static int sig_handler_wrap (lua_State *L) {
	int sig = luaL_checkinteger(L, lua_upvalueindex(1));
	void (*handler)(int) = lua_touserdata(L, lua_upvalueindex(2));
	handler(sig);
	return 0;
}

/***
Install a signal handler for this signal number.
N.B. Although this is the same API as signal(2), it uses sigaction for guaranteed semantics.
@function signal
@see sigaction(2)
@see signal.lua
@int signum
@param handler function
@param flags optional the `sa_flags` element of `struct sigaction`
@return previous handler function
*/
static int Psignal (lua_State *L)
{
	struct sigaction sa, oldsa;
	int sig = luaL_checkinteger(L, 1), ret;
	void (*handler)(int) = sig_postpone;

	/* Check handler is OK */
	switch (lua_type(L, 2)) {
	case LUA_TNIL:
	case LUA_TSTRING:
		handler = Fsigmacros[luaL_checkoption(L, 2, "SIG_DFL", Ssigmacros)];
		break;
	case LUA_TFUNCTION:
		if (lua_tocfunction(L, 2) == sig_handler_wrap) {
			lua_getupvalue(L, 2, 1);
			handler = lua_touserdata(L, -1);
			lua_pop(L, 1);
		}
	}

	/* Set up C signal handler, getting old handler */
	sa.sa_handler = handler;
	sa.sa_flags = luaL_optint(L, 3, 0);
	sigfillset(&sa.sa_mask);
	ret = sigaction(sig, &sa, &oldsa);
	if (ret == -1)
		return 0;

	/* Set Lua handler if necessary */
	if (handler == sig_postpone) {
		lua_pushlightuserdata(L, &signalL); /* We could use an upvalue, but we need this for sig_handle anyway. */
		lua_rawget(L, LUA_REGISTRYINDEX);
		lua_pushvalue(L, 1);
		lua_pushvalue(L, 2);
		lua_rawset(L, -3);
		lua_pop(L, 1);
	}

	/* Push old handler as result */
	if (oldsa.sa_handler == sig_postpone) {
		lua_pushlightuserdata(L, &signalL);
		lua_rawget(L, LUA_REGISTRYINDEX);
		lua_pushvalue(L, 1);
		lua_rawget(L, -2);
	} else if (oldsa.sa_handler == SIG_DFL)
		lua_pushstring(L, "SIG_DFL");
	else if (oldsa.sa_handler == SIG_IGN)
		lua_pushstring(L, "SIG_IGN");
	else {
		lua_pushinteger(L, sig);
		lua_pushlightuserdata(L, oldsa.sa_handler);
		lua_pushcclosure(L, sig_handler_wrap, 2);
	}
	return 1;
}

static int Ptcsetattr(lua_State *L)
{
	struct termios t;
	int i;
	int fd = luaL_checknumber(L, 1);
	int act = luaL_checknumber(L, 2);
	luaL_checktype(L, 3, LUA_TTABLE);

	lua_getfield(L, 3, "iflag"); t.c_iflag = luaL_optint(L, -1, 0); lua_pop(L, 1);
	lua_getfield(L, 3, "oflag"); t.c_oflag = luaL_optint(L, -1, 0); lua_pop(L, 1);
	lua_getfield(L, 3, "cflag"); t.c_cflag = luaL_optint(L, -1, 0); lua_pop(L, 1);
	lua_getfield(L, 3, "lflag"); t.c_lflag = luaL_optint(L, -1, 0); lua_pop(L, 1);

	lua_getfield(L, 3, "cc");
	for(i=0; i<NCCS; i++) {
		lua_pushnumber(L, i);
		lua_gettable(L, -2);
		t.c_cc[i] = luaL_optint(L, -1, 0);
		lua_pop(L, 1);
	}

	return pushresult(L, tcsetattr(fd, act, &t), NULL);
}

static int Ptcgetattr(lua_State *L)
{
	int i;
	struct termios t;
	int fd = luaL_checknumber(L, 1);

	int r = tcgetattr(fd, &t);
	if(r == -1) return pusherror(L, NULL);

	lua_newtable(L);
	lua_pushnumber(L, t.c_iflag); lua_setfield(L, -2, "iflag");
	lua_pushnumber(L, t.c_oflag); lua_setfield(L, -2, "oflag");
	lua_pushnumber(L, t.c_lflag); lua_setfield(L, -2, "lflag");
	lua_pushnumber(L, t.c_cflag); lua_setfield(L, -2, "cflag");

	lua_newtable(L);
	for(i=0; i<NCCS; i++) {
		lua_pushnumber(L, i);
		lua_pushnumber(L, t.c_cc[i]);
		lua_settable(L, -3);
	}
	lua_setfield(L, -2, "cc");

	return 1;
}

static int Ptcsendbreak(lua_State *L)
{
	int fd = luaL_checknumber(L, 1);
	int duration = luaL_checknumber(L, 2);
	return pushresult(L, tcsendbreak(fd, duration), NULL);
}

static int Ptcdrain(lua_State *L)
{
	int fd = luaL_checknumber(L, 1);
	return pushresult(L, tcdrain(fd), NULL);
}

static int Ptcflush(lua_State *L)
{
	int fd = luaL_checknumber(L, 1);
	int qs = luaL_checknumber(L, 2);
	return pushresult(L, tcflush(fd, qs), NULL);
}

static int Ptcflow(lua_State *L)
{
	int fd = luaL_checknumber(L, 1);
	int action = luaL_checknumber(L, 2);
	return pushresult(L, tcflow(fd, action), NULL);
}

#if _POSIX_VERSION >= 200112L

static int Psocket(lua_State *L)
{
	int domain = luaL_checknumber(L, 1);
	int type = luaL_checknumber(L, 2);
	int options = luaL_checknumber(L, 3);
	return pushresult(L, socket(domain, type, options), NULL);
}

/* Push a new lua table populated with the fields describing the passed sockaddr */

static int sockaddr_to_lua(lua_State *L, int family, struct sockaddr *sa)
{
	char addr[INET6_ADDRSTRLEN];
	int port;
	struct sockaddr_in *sa4;
	struct sockaddr_in6 *sa6;

	switch (family)
	{
		case AF_INET:
			sa4 = (struct sockaddr_in *)sa;
			inet_ntop(family, &sa4->sin_addr, addr, sizeof addr);
			port = ntohs(sa4->sin_port);
			break;
		case AF_INET6:
			sa6 = (struct sockaddr_in6 *)sa;
			inet_ntop(family, &sa6->sin6_addr, addr, sizeof addr);
			port = ntohs(sa6->sin6_port);
			break;
	}

	lua_newtable(L);
	lua_pushnumber(L, family); lua_setfield(L, -2, "family");
	lua_pushnumber(L, port); lua_setfield(L, -2, "port");
	lua_pushstring(L, addr); lua_setfield(L, -2, "addr");
	return 1;
}

/* Populate a sockaddr_storage with the info from the given lua table */

static int sockaddr_from_lua(lua_State *L, int index, struct sockaddr_storage *sa, socklen_t *addrlen)
{
	struct sockaddr_in *sa4;
	struct sockaddr_in6 *sa6;
	int family, port;
	const char *addr;
	int r;

	memset(sa, 0, sizeof *sa);

	luaL_checktype(L, index, LUA_TTABLE);
	lua_getfield(L, index, "family"); family = luaL_checknumber(L, -1); lua_pop(L, 1);
	lua_getfield(L, index, "port"); port = luaL_checknumber(L, -1); lua_pop(L, 1);
	lua_getfield(L, index, "addr"); addr = luaL_checkstring(L, -1); lua_pop(L, 1);

	switch(family) {
		case AF_INET:
			sa4 = (struct sockaddr_in *)sa;
			r = inet_pton(AF_INET, addr, &sa4->sin_addr);
			if(r == 1) {
				sa4->sin_family = family;
				sa4->sin_port = htons(port);
				*addrlen = sizeof(*sa4);
				return 0;
			}
			break;
		case AF_INET6:
			sa6 = (struct sockaddr_in6 *)sa;
			r = inet_pton(AF_INET6, addr, &sa6->sin6_addr);
			if(r == 1) {
				sa6->sin6_family = family;
				sa6->sin6_port = htons(port);
				*addrlen = sizeof(*sa6);
				return 0;
			}
			break;
	}
	return -1;
}

static int Pgetaddrinfo(lua_State *L)
{
	int r;
	int n = 1;
	struct addrinfo *res, *rp, *hints = NULL;
	const char *host = luaL_checkstring(L, 1);
	const char *service = lua_tostring(L, 2);

	memset(&hints, 0, sizeof hints);

	if(lua_type(L, 3) == LUA_TTABLE) {
		hints = alloca(sizeof *hints);
		lua_getfield(L, 3, "family"); hints->ai_family = lua_tonumber(L, -1); lua_pop(L, 1);
		lua_getfield(L, 3, "flags"); hints->ai_flags = lua_tonumber(L, -1); lua_pop(L, 1);
		lua_getfield(L, 3, "socktype"); hints->ai_socktype = lua_tonumber(L, -1); lua_pop(L, 1);
		lua_getfield(L, 3, "protocol"); hints->ai_protocol = lua_tonumber(L, -1); lua_pop(L, 1);
	}

	r = getaddrinfo(host, service, hints, &res);
	if(r != 0) {
		lua_pushnil(L);
		lua_pushstring(L, gai_strerror(r));
		lua_pushinteger(L, r);
		return 3;
	}

	/* Copy getaddrinfo() result into Lua table */

	lua_newtable(L);

	for (rp = res; rp != NULL; rp = rp->ai_next) {
		lua_pushnumber(L, n++);
		sockaddr_to_lua(L, rp->ai_family, rp->ai_addr);
		lua_pushnumber(L, rp->ai_socktype); lua_setfield(L, -2, "socktype");
		lua_pushstring(L, rp->ai_canonname); lua_setfield(L, -2, "canonname");
		lua_pushnumber(L, rp->ai_protocol); lua_setfield(L, -2, "protocol");
		lua_settable(L, -3);
	}

	freeaddrinfo(res);

	return 1;
}

static int Pconnect(lua_State *L)
{
	struct sockaddr_storage sa;
	socklen_t salen;
	int r;
	int fd = luaL_checknumber(L, 1);
	r = sockaddr_from_lua(L, 2, &sa, &salen);
	if(r == -1) return pusherror(L, "not a valid IPv4 dotted-decimal or IPv6 address string");

	r = connect(fd, (struct sockaddr *)&sa, salen);
	if(r < 0 && errno != EINPROGRESS) return pusherror(L, NULL);

	lua_pushboolean(L, 1);
	return 1;
}

static int Pbind(lua_State *L)
{
	struct sockaddr_storage sa;
	socklen_t salen;
	int r;
	int fd = luaL_checknumber(L, 1);
	r = sockaddr_from_lua(L, 2, &sa, &salen);
	if(r == -1) return pusherror(L, "not a valid IPv4 dotted-decimal or IPv6 address string");

	r = bind(fd, (struct sockaddr *)&sa, salen);
	if(r < 0) return pusherror(L, NULL);
	lua_pushboolean(L, 1);
	return 1;
}

static int Plisten(lua_State *L)
{
	int fd = luaL_checknumber(L, 1);
	int backlog = luaL_checkint(L, 2);

	return pushresult(L, listen(fd, backlog), NULL);
}

static int Paccept(lua_State *L)
{
	int fd_client;
	struct sockaddr_storage sa;
	unsigned int salen;

	int fd = luaL_checknumber(L, 1);

	salen = sizeof(sa);
	fd_client = accept(fd, (struct sockaddr *)&sa, &salen);
	if(fd_client == -1) {
		return pusherror(L, NULL);
	}

	lua_pushnumber(L, fd_client);
	sockaddr_to_lua(L, sa.ss_family, (struct sockaddr *)&sa);

	return 2;
}

static int Precv(lua_State *L)
{
	int fd = luaL_checkint(L, 1);
	int count = luaL_checkint(L, 2), ret;
	void *ud, *buf;
	lua_Alloc lalloc = lua_getallocf(L, &ud);

	/* Reset errno in case lalloc doesn't set it */
	errno = 0;
	if ((buf = lalloc(ud, NULL, 0, count)) == NULL && count > 0)
		return pusherror(L, "lalloc");

	ret = recv(fd, buf, count, 0);
	if (ret < 0) {
		lalloc(ud, buf, count, 0);
		return pusherror(L, NULL);
	}

	lua_pushlstring(L, buf, ret);
	lalloc(ud, buf, count, 0);
	return 1;
}

static int Precvfrom(lua_State *L)
{
	void *ud, *buf;
	socklen_t salen;
	struct sockaddr_storage sa;
	int r;
	int fd = luaL_checkint(L, 1);
	int count = luaL_checkint(L, 2);
	lua_Alloc lalloc = lua_getallocf(L, &ud);

	/* Reset errno in case lalloc doesn't set it */
	errno = 0;
	if ((buf = lalloc(ud, NULL, 0, count)) == NULL && count > 0)
		return pusherror(L, "lalloc");

	salen = sizeof(sa);
	r = recvfrom(fd, buf, count, 0, (struct sockaddr *)&sa, &salen);
	if (r < 0) {
		lalloc(ud, buf, count, 0);
		return pusherror(L, NULL);
	}

	lua_pushlstring(L, buf, r);
	lalloc(ud, buf, count, 0);
	sockaddr_to_lua(L, sa.ss_family, (struct sockaddr *)&sa);

	return 2;
}

static int Psend(lua_State *L)
{
	int fd = luaL_checknumber(L, 1);
	size_t len;
	const char *buf = luaL_checklstring(L, 2, &len);

	return pushresult(L, send(fd, buf, len, 0), NULL);
}

static int Psendto(lua_State *L)
{
	size_t len;
	struct sockaddr_storage sa;
	socklen_t salen;
	int r;
	int fd = luaL_checknumber(L, 1);
	const char *buf = luaL_checklstring(L, 2, &len);
	r = sockaddr_from_lua(L, 3, &sa, &salen);
	if(r == -1) return pusherror(L, "not a valid IPv4 dotted-decimal or IPv6 address string");

	r = sendto(fd, buf, len, 0, (struct sockaddr *)&sa, salen);
	return pushresult(L, r, NULL);
}

static int Pshutdown(lua_State *L)
{
	int fd = luaL_checknumber(L, 1);
	int how = luaL_checknumber(L, 2);
	return pushresult(L, shutdown(fd, how), NULL);
}

static int Psetsockopt(lua_State *L)
{
	int fd = luaL_checknumber(L, 1);
	int level = luaL_checknumber(L, 2);
	int optname = luaL_checknumber(L, 3);
	struct linger linger;
	struct timeval tv;
	struct ipv6_mreq mreq6;
	int vint = 0;
	void *val = NULL;
	socklen_t len = sizeof(vint);

	switch(level) {
		case SOL_SOCKET:
			switch(optname) {
				case SO_LINGER:
					linger.l_onoff = luaL_checknumber(L, 4);
					linger.l_linger = luaL_checknumber(L, 5);
					val = &linger;
					len = sizeof(linger);
					break;
				case SO_RCVTIMEO:
				case SO_SNDTIMEO:
					tv.tv_sec = luaL_checknumber(L, 4);
					tv.tv_usec = luaL_checknumber(L, 5);
					val = &tv;
					len = sizeof(tv);
					break;
				default:
					break;
			}
			break;
		case IPPROTO_IPV6:
			switch(optname) {
				case IPV6_JOIN_GROUP:
				case IPV6_LEAVE_GROUP:
					memset(&mreq6, 0, sizeof mreq6);
					inet_pton(AF_INET6, luaL_checkstring(L, 4), &mreq6.ipv6mr_multiaddr);
					val = &mreq6;
					len = sizeof(mreq6);
					break;
				default:
					break;
			}
			break;
		case IPPROTO_TCP:
			switch(optname) {
				default:
					break;
			}
			break;
		default:
			break;
	}

	/* Default fallback to int if no specific handling of type above */

	if(val == NULL) {
		vint = luaL_checknumber(L, 4);
		val = &vint;
		len = sizeof(vint);
	}

	return pushresult(L, setsockopt(fd, level, optname, val, len), NULL);
}
#endif

/***
 commit buffer cache to disk
@function sync
@see sync(2)
*/
static int Psync(lua_State *UNUSED (L))
{
  sync();
  return 0;
}

/***
 synchronize a file's in-core state with storage device
@function fsync
@see fsync(2)
@int fd
@return 0 on success, nil otherwise
@return error message if failed.
*/
static int Pfsync(lua_State *L)
{
  int fd = luaL_checkint(L, 1);
  return pushresult(L, fsync(fd), NULL);
}

#if _POSIX_VERSION >= 200112L
/***
 synchronize a file's in-core state with storage device without metadata
@function fdatasync
@see fdatasync(2)
@int fd
@return 0 on success, nil otherwise
@return error message if failed.
*/
static int Pfdatasync(lua_State *L)
{
  int fd = luaL_checkint(L, 1);
  return pushresult(L, fdatasync(fd), NULL);
}
#endif

/***
reposition read/write file offset
@function lseek
@see lseek(2)
@int fd
@int offset
@int whence one of SEEK_SET, SEEK_CUR or SEEK_END
@return new offset on success, nil otherwise
@return error message if failed.
*/
static int Plseek(lua_State *L)
{
  int fd = luaL_checknumber(L, 1);
  int offset = luaL_checknumber(L, 2);
  int whence = luaL_checknumber(L, 3);
  return pushresult(L, lseek(fd, offset, whence), NULL);
}

/***
change process priority
@function nice
@see nice(2)
@int inc adds inc to the nice value for the calling process
@return new nice value on success, nil otherwise
@return error message if failed.
*/
static int Pnice(lua_State *L)
{
  int inc = luaL_checknumber(L, 1);
  return pushresult(L, nice(inc), NULL);
}

static const luaL_Reg R[] =
{
#define MENTRY(_s) {LPOSIX_STR_1(_s), (_s)}
	MENTRY( P_exit		),
	MENTRY( Pabort		),
	MENTRY( Paccess		),
	MENTRY( Pbasename	),
	MENTRY( Pchdir		),
	MENTRY( Pchmod		),
	MENTRY( Pchown		),
#if defined _XOPEN_REALTIME && _XOPEN_REALTIME != -1
	MENTRY( Pclock_getres	),
	MENTRY( Pclock_gettime	),
#endif
	MENTRY( Pclose		),
#if defined HAVE_CRYPT
	MENTRY( Pcrypt		),
#endif
	MENTRY( Pctermid	),
	MENTRY( Pdirname	),
	MENTRY( Pdir		),
	MENTRY( Pdup		),
	MENTRY( Pdup2		),
	MENTRY( Perrno		),
	MENTRY( Pexec		),
	MENTRY( Pexecp		),
#if _POSIX_VERSION >= 200112L
	MENTRY( Pfdatasync	),
#endif
	MENTRY( Pfcntl		),
	MENTRY( Pfileno		),
	MENTRY( Pfiles		),
	MENTRY( Pfnmatch	),
	MENTRY( Pfork		),
	MENTRY( Pfsync		),
	MENTRY( Pgetcwd		),
	MENTRY( Pgetenv		),
	MENTRY( Pgetgroup	),
#if _POSIX_VERSION >= 200112L
	MENTRY( Pgetgroups	),
#endif
	MENTRY( Pgetlogin	),
	MENTRY( Pgetopt		),
	MENTRY( Pgetpasswd	),
	MENTRY( Pgetpid		),
	MENTRY( Pgetrlimit	),
	MENTRY( Pgettimeofday	),
	MENTRY( Pglob		),
	MENTRY( Pgmtime		),
	MENTRY( Pgrantpt        ),
	MENTRY( Phostid		),
	MENTRY( Pisatty		),
	MENTRY( Pisgraph	),
	MENTRY( Pisprint	),
	MENTRY( Pkill		),
	MENTRY( Pkillpg		),
	MENTRY( Plink		),
	MENTRY( Plocaltime	),
	MENTRY( Plseek		),
	MENTRY( Pmkdir		),
	MENTRY( Pmkfifo		),
	MENTRY( Pmkstemp	),
	MENTRY( Pmkdtemp	),
	MENTRY( Pmktime		),
	MENTRY( Pnice		),
	MENTRY( Popen		),
	MENTRY( Popenpt		),
	MENTRY( Ppathconf	),
	MENTRY( Ppipe		),
	MENTRY( Praise		),
	MENTRY( Pread		),
	MENTRY( Preadlink	),
	MENTRY( Prealpath	),
	MENTRY( Prmdir		),
	MENTRY( Prpoll		),
	MENTRY( Ppoll		),
	MENTRY( Pptsname        ),
	MENTRY( Pset_errno	),
	MENTRY( Psetenv		),
	MENTRY( Psetpid		),
	MENTRY( Psetrlimit	),
	MENTRY( Psignal		),
	MENTRY( Psleep		),
	MENTRY( Pnanosleep	),
	MENTRY( Pmsgget ),
	MENTRY( Pmsgsnd ),
	MENTRY( Pmsgrcv ),
	MENTRY( Pstat		),
	MENTRY( Pstrftime	),
	MENTRY( Pstrptime	),
	MENTRY( Psync		),
	MENTRY( Psysconf	),
	MENTRY( Ptime		),
	MENTRY( Ptimes		),
	MENTRY( Pttyname	),
	MENTRY( Punlink		),
	MENTRY( Punlockpt	),
	MENTRY( Pumask		),
	MENTRY( Puname		),
	MENTRY( Putime		),
	MENTRY( Pwait		),
	MENTRY( Pwrite		),

	MENTRY( Ptcsetattr	),
	MENTRY( Ptcgetattr	),
	MENTRY( Ptcsendbreak	),
	MENTRY( Ptcdrain	),
	MENTRY( Ptcflush	),
	MENTRY( Ptcflow		),

#if _POSIX_VERSION >= 200112L
	MENTRY( Psocket		),
	MENTRY( Pgetaddrinfo	),
	MENTRY( Pconnect	),
	MENTRY( Pbind		),
	MENTRY( Plisten		),
	MENTRY( Paccept		),
	MENTRY( Precv		),
	MENTRY( Precvfrom	),
	MENTRY( Psend		),
	MENTRY( Psendto		),
	MENTRY( Pshutdown	),
	MENTRY( Psetsockopt	),
#endif

#if _POSIX_VERSION >= 200112L
	MENTRY( Popenlog	),
	MENTRY( Psyslog		),
	MENTRY( Pcloselog	),
	MENTRY( Psetlogmask	),
#endif
#if defined HAVE_STATVFS
	MENTRY( Pstatvfs	),
#endif
#undef MENTRY
	{NULL,	NULL}
};

#define set_integer_const(key, value)	\
	lua_pushinteger(L, value);	\
	lua_setfield(L, -2, key)

LUALIB_API int luaopen_posix_c (lua_State *L)
{
	luaL_register(L, MYNAME, R);

	lua_pushliteral(L, MYVERSION);
	lua_setfield(L, -2, "version");

#define MENTRY(_f) set_integer_const(#_f, _f)
	/* stdio.h constants */
	/* Those that are omitted already have a Lua interface, or alternative. */
	MENTRY( _IOFBF		);
	MENTRY( _IOLBF		);
	MENTRY( _IONBF		);
	MENTRY( BUFSIZ		);
	MENTRY( EOF		);
	MENTRY( FOPEN_MAX	);
	MENTRY( FILENAME_MAX	);

	/* Darwin fails to define O_RSYNC. */
#ifndef O_RSYNC
#define O_RSYNC 0
#endif

	/* file creation & status flags */
	MENTRY( O_RDONLY	);
	MENTRY( O_WRONLY	);
	MENTRY( O_RDWR		);
	MENTRY( O_APPEND	);
	MENTRY( O_CREAT		);
	MENTRY( O_DSYNC		);
	MENTRY( O_EXCL		);
	MENTRY( O_NOCTTY	);
	MENTRY( O_NONBLOCK	);
	MENTRY( O_RSYNC		);
	MENTRY( O_SYNC		);
	MENTRY( O_TRUNC		);

	/* lseek arguments */
	MENTRY( SEEK_SET	);
	MENTRY( SEEK_CUR	);
	MENTRY( SEEK_END	);

	/* errno values */
#ifdef E2BIG
	MENTRY( E2BIG		);
#endif
#ifdef EACCES
	MENTRY( EACCES		);
#endif
#ifdef EADDRINUSE
	MENTRY( EADDRINUSE	);
#endif
#ifdef EADDRNOTAVAIL
	MENTRY( EADDRNOTAVAIL	);
#endif
#ifdef EAFNOSUPPORT
	MENTRY( EAFNOSUPPORT	);
#endif
#ifdef EAGAIN
	MENTRY( EAGAIN		);
#endif
#ifdef EALREADY
	MENTRY( EALREADY	);
#endif
#ifdef EBADF
	MENTRY( EBADF		);
#endif
#ifdef EBADMSG
	MENTRY( EBADMSG		);
#endif
#ifdef EBUSY
	MENTRY( EBUSY		);
#endif
#ifdef ECANCELED
	MENTRY( ECANCELED	);
#endif
#ifdef ECHILD
	MENTRY( ECHILD		);
#endif
#ifdef ECONNABORTED
	MENTRY( ECONNABORTED	);
#endif
#ifdef ECONNREFUSED
	MENTRY( ECONNREFUSED	);
#endif
#ifdef ECONNRESET
	MENTRY( ECONNRESET	);
#endif
#ifdef EDEADLK
	MENTRY( EDEADLK		);
#endif
#ifdef EDESTADDRREQ
	MENTRY( EDESTADDRREQ	);
#endif
#ifdef EDOM
	MENTRY( EDOM		);
#endif
#ifdef EEXIST
	MENTRY( EEXIST		);
#endif
#ifdef EFAULT
	MENTRY( EFAULT		);
#endif
#ifdef EFBIG
	MENTRY( EFBIG		);
#endif
#ifdef EHOSTUNREACH
	MENTRY( EHOSTUNREACH	);
#endif
#ifdef EIDRM
	MENTRY( EIDRM		);
#endif
#ifdef EILSEQ
	MENTRY( EILSEQ		);
#endif
#ifdef EINPROGRESS
	MENTRY( EINPROGRESS	);
#endif
#ifdef EINTR
	MENTRY( EINTR		);
#endif
#ifdef EINVAL
	MENTRY( EINVAL		);
#endif
#ifdef EIO
	MENTRY( EIO		);
#endif
#ifdef EISCONN
	MENTRY( EISCONN		);
#endif
#ifdef EISDIR
	MENTRY( EISDIR		);
#endif
#ifdef ELOOP
	MENTRY( ELOOP		);
#endif
#ifdef EMFILE
	MENTRY( EMFILE		);
#endif
#ifdef EMLINK
	MENTRY( EMLINK		);
#endif
#ifdef EMSGSIZE
	MENTRY( EMSGSIZE	);
#endif
#ifdef ENAMETOOLONG
	MENTRY( ENAMETOOLONG	);
#endif
#ifdef ENETDOWN
	MENTRY( ENETDOWN	);
#endif
#ifdef ENETRESET
	MENTRY( ENETRESET	);
#endif
#ifdef ENETUNREACH
	MENTRY( ENETUNREACH	);
#endif
#ifdef ENFILE
	MENTRY( ENFILE		);
#endif
#ifdef ENOBUFS
	MENTRY( ENOBUFS		);
#endif
#ifdef ENODEV
	MENTRY( ENODEV		);
#endif
#ifdef ENOENT
	MENTRY( ENOENT		);
#endif
#ifdef ENOEXEC
	MENTRY( ENOEXEC		);
#endif
#ifdef ENOLCK
	MENTRY( ENOLCK		);
#endif
#ifdef ENOMEM
	MENTRY( ENOMEM		);
#endif
#ifdef ENOMSG
	MENTRY( ENOMSG		);
#endif
#ifdef ENOPROTOOPT
	MENTRY( ENOPROTOOPT	);
#endif
#ifdef ENOSPC
	MENTRY( ENOSPC		);
#endif
#ifdef ENOSYS
	MENTRY( ENOSYS		);
#endif
#ifdef ENOTCONN
	MENTRY( ENOTCONN	);
#endif
#ifdef ENOTDIR
	MENTRY( ENOTDIR		);
#endif
#ifdef ENOTEMPTY
	MENTRY( ENOTEMPTY	);
#endif
#ifdef ENOTSOCK
	MENTRY( ENOTSOCK	);
#endif
#ifdef ENOTSUP
	MENTRY( ENOTSUP		);
#endif
#ifdef ENOTTY
	MENTRY( ENOTTY		);
#endif
#ifdef ENXIO
	MENTRY( ENXIO		);
#endif
#ifdef EOPNOTSUPP
	MENTRY( EOPNOTSUPP	);
#endif
#ifdef EOVERFLOW
	MENTRY( EOVERFLOW	);
#endif
#ifdef EPERM
	MENTRY( EPERM		);
#endif
#ifdef EPIPE
	MENTRY( EPIPE		);
#endif
#ifdef EPROTO
	MENTRY( EPROTO		);
#endif
#ifdef EPROTONOSUPPORT
	MENTRY( EPROTONOSUPPORT	);
#endif
#ifdef EPROTOTYPE
	MENTRY( EPROTOTYPE	);
#endif
#ifdef ERANGE
	MENTRY( ERANGE		);
#endif
#ifdef EROFS
	MENTRY( EROFS		);
#endif
#ifdef ESPIPE
	MENTRY( ESPIPE		);
#endif
#ifdef ESRCH
	MENTRY( ESRCH		);
#endif
#ifdef ETIMEDOUT
	MENTRY( ETIMEDOUT	);
#endif
#ifdef ETXTBSY
	MENTRY( ETXTBSY		);
#endif
#ifdef EWOULDBLOCK
	MENTRY( EWOULDBLOCK	);
#endif
#ifdef EXDEV
	MENTRY( EXDEV		);
#endif

	/* Signals */
#ifdef SIGABRT
	MENTRY( SIGABRT		);
#endif
#ifdef SIGALRM
	MENTRY( SIGALRM		);
#endif
#ifdef SIGBUS
	MENTRY( SIGBUS		);
#endif
#ifdef SIGCHLD
	MENTRY( SIGCHLD		);
#endif
#ifdef SIGCONT
	MENTRY( SIGCONT		);
#endif
#ifdef SIGFPE
	MENTRY( SIGFPE		);
#endif
#ifdef SIGHUP
	MENTRY( SIGHUP		);
#endif
#ifdef SIGILL
	MENTRY( SIGILL		);
#endif
#ifdef SIGINT
	MENTRY( SIGINT		);
#endif
#ifdef SIGKILL
	MENTRY( SIGKILL		);
#endif
#ifdef SIGPIPE
	MENTRY( SIGPIPE		);
#endif
#ifdef SIGQUIT
	MENTRY( SIGQUIT		);
#endif
#ifdef SIGSEGV
	MENTRY( SIGSEGV		);
#endif
#ifdef SIGSTOP
	MENTRY( SIGSTOP		);
#endif
#ifdef SIGTERM
	MENTRY( SIGTERM		);
#endif
#ifdef SIGTSTP
	MENTRY( SIGTSTP		);
#endif
#ifdef SIGTTIN
	MENTRY( SIGTTIN		);
#endif
#ifdef SIGTTOU
	MENTRY( SIGTTOU		);
#endif
#ifdef SIGUSR1
	MENTRY( SIGUSR1		);
#endif
#ifdef SIGUSR2
	MENTRY( SIGUSR2		);
#endif
#ifdef SIGSYS
	MENTRY( SIGSYS		);
#endif
#ifdef SIGTRAP
	MENTRY( SIGTRAP		);
#endif
#ifdef SIGURG
	MENTRY( SIGURG		);
#endif
#ifdef SIGVTALRM
	MENTRY( SIGVTALRM	);
#endif
#ifdef SIGXCPU
	MENTRY( SIGXCPU		);
#endif
#ifdef SIGXFSZ
	MENTRY( SIGXFSZ		);
#endif

	/* Signal flags */
#ifdef SA_NOCLDSTOP
	MENTRY( SA_NOCLDSTOP	);
#endif
#ifdef SA_NOCLDWAIT
	MENTRY( SA_NOCLDWAIT	);
#endif
#ifdef SA_RESETHAND
	MENTRY( SA_RESETHAND	);
#endif
#ifdef SA_NODEFER
	MENTRY( SA_NODEFER	);
#endif

#if _POSIX_VERSION >= 200112L
	MENTRY( LOG_AUTH	);
	MENTRY( LOG_AUTHPRIV	);
	MENTRY( LOG_CRON	);
	MENTRY( LOG_DAEMON	);
	MENTRY( LOG_FTP		);
	MENTRY( LOG_KERN	);
	MENTRY( LOG_LOCAL0	);
	MENTRY( LOG_LOCAL1	);
	MENTRY( LOG_LOCAL2	);
	MENTRY( LOG_LOCAL3	);
	MENTRY( LOG_LOCAL4	);
	MENTRY( LOG_LOCAL5	);
	MENTRY( LOG_LOCAL6	);
	MENTRY( LOG_LOCAL7	);
	MENTRY( LOG_LPR		);
	MENTRY( LOG_MAIL	);
	MENTRY( LOG_NEWS	);
	MENTRY( LOG_SYSLOG	);
	MENTRY( LOG_USER	);
	MENTRY( LOG_UUCP	);

	MENTRY( LOG_EMERG	);
	MENTRY( LOG_ALERT	);
	MENTRY( LOG_CRIT	);
	MENTRY( LOG_ERR		);
	MENTRY( LOG_WARNING	);
	MENTRY( LOG_NOTICE	);
	MENTRY( LOG_INFO	);
	MENTRY( LOG_DEBUG	);
#endif

	MENTRY( F_DUPFD		);
	MENTRY( F_GETFD		);
	MENTRY( F_SETFD		);
	MENTRY( F_GETFL		);
	MENTRY( F_SETFL		);
	MENTRY( F_GETLK		);
	MENTRY( F_SETLK		);
	MENTRY( F_SETLKW	);
	MENTRY( F_GETOWN	);
	MENTRY( F_SETOWN	);
	MENTRY( F_RDLCK		);
	MENTRY( F_WRLCK		);
	MENTRY( F_UNLCK		);

	/* from fnmatch.h */
	MENTRY( FNM_PATHNAME	);
	MENTRY( FNM_NOESCAPE	);
	MENTRY( FNM_PERIOD	);

	/* Message queues */
	MENTRY( IPC_CREAT	);
	MENTRY( IPC_EXCL	);
	MENTRY( IPC_PRIVATE	);

	/* Miscellaneous */
	MENTRY( WNOHANG		);
	MENTRY( STDIN_FILENO	);
	MENTRY( STDOUT_FILENO	);
	MENTRY( STDERR_FILENO	);

	/* tcsetattr */
	MENTRY( TCSANOW		);
	MENTRY( TCSADRAIN	);
	MENTRY( TCSAFLUSH	);

	/* tcflush */
	MENTRY( TCIFLUSH	);
	MENTRY( TCOFLUSH	);
	MENTRY( TCIOFLUSH	);

	/* tcflow() */
	MENTRY( TCOOFF		);
	MENTRY( TCOON		);
	MENTRY( TCIOFF		);
	MENTRY( TCION		);

	/* cflag */
#ifdef B0
	MENTRY( B0		);
#endif
#ifdef B50
	MENTRY( B50		);
#endif
#ifdef B75
	MENTRY( B75		);
#endif
#ifdef B110
	MENTRY( B110		);
#endif
#ifdef B134
	MENTRY( B134		);
#endif
#ifdef B150
	MENTRY( B150		);
#endif
#ifdef B200
	MENTRY( B200		);
#endif
#ifdef B300
	MENTRY( B300		);
#endif
#ifdef B600
	MENTRY( B600		);
#endif
#ifdef B1200
	MENTRY( B1200		);
#endif
#ifdef B1800
	MENTRY( B1800		);
#endif
#ifdef B2400
	MENTRY( B2400		);
#endif
#ifdef B4800
	MENTRY( B4800		);
#endif
#ifdef B9600
	MENTRY( B9600		);
#endif
#ifdef B19200
	MENTRY( B19200		);
#endif
#ifdef B38400
	MENTRY( B38400		);
#endif
#ifdef B57600
	MENTRY( B57600		);
#endif
#ifdef B115200
	MENTRY( B115200		);
#endif
#ifdef CSIZE
	MENTRY( CSIZE		);
#endif
#ifdef BS5
	MENTRY( CS5		);
#endif
#ifdef CS6
	MENTRY( CS6		);
#endif
#ifdef CS7
	MENTRY( CS7		);
#endif
#ifdef CS8
	MENTRY( CS8		);
#endif
#ifdef CSTOPB
	MENTRY( CSTOPB		);
#endif
#ifdef CREAD
	MENTRY( CREAD		);
#endif
#ifdef PARENB
	MENTRY( PARENB		);
#endif
#ifdef PARODD
	MENTRY( PARODD		);
#endif
#ifdef HUPCL
	MENTRY( HUPCL		);
#endif
#ifdef CLOCAL
	MENTRY( CLOCAL		);
#endif
#ifdef CRTSCTS
	MENTRY( CRTSCTS		);
#endif

	/* lflag */
#ifdef ISIG
	MENTRY( ISIG		);
#endif
#ifdef ICANON
	MENTRY( ICANON		);
#endif
#ifdef ECHO
	MENTRY( ECHO		);
#endif
#ifdef ECHOE
	MENTRY( ECHOE		);
#endif
#ifdef ECHOK
	MENTRY( ECHOK		);
#endif
#ifdef ECHONL
	MENTRY( ECHONL		);
#endif
#ifdef NOFLSH
	MENTRY( NOFLSH		);
#endif
#ifdef IEXTEN
	MENTRY( IEXTEN		);
#endif
#ifdef TOSTOP
	MENTRY( TOSTOP		);
#endif

	/* iflag */
#ifdef INPCK
	MENTRY( INPCK		);
#endif
#ifdef IGNPAR
	MENTRY( IGNPAR		);
#endif
#ifdef PARMRK
	MENTRY( PARMRK		);
#endif
#ifdef ISTRIP
	MENTRY( ISTRIP		);
#endif
#ifdef IXON
	MENTRY( IXON		);
#endif
#ifdef IXOFF
	MENTRY( IXOFF		);
#endif
#ifdef IXANY
	MENTRY( IXANY		);
#endif
#ifdef IGNBRK
	MENTRY( IGNBRK		);
#endif
#ifdef BRKINT
	MENTRY( BRKINT		);
#endif
#ifdef INLCR
	MENTRY( INLCR		);
#endif
#ifdef IGNCR
	MENTRY( IGNCR		);
#endif
#ifdef ICRNL
	MENTRY( ICRNL		);
#endif
#ifdef IMAXBEL
	MENTRY( IMAXBEL		);
#endif

	/* oflag */
#ifdef OPOST
	MENTRY( OPOST		);
#endif
#ifdef ONLCR
	MENTRY( ONLCR		);
#endif
#ifdef OCRNL
	MENTRY( OCRNL		);
#endif
#ifdef ONLRET
	MENTRY( ONLRET		);
#endif
#ifdef OFILL
	MENTRY( OFILL		);
#endif
#ifdef OFDEL
	MENTRY( OFDEL		);
#endif
#ifdef NLDLY
	MENTRY( NLDLY		);
#endif
#ifdef NL0
	MENTRY( NL0		);
#endif
#ifdef NL1
	MENTRY( NL1		);
#endif
#ifdef CRDLY
	MENTRY( CRDLY		);
#endif
#ifdef CR0
	MENTRY( CR0		);
#endif
#ifdef CR1
	MENTRY( CR1		);
#endif
#ifdef CR2
	MENTRY( CR2		);
#endif
#ifdef CR3
	MENTRY( CR3		);
#endif
#ifdef TABDLY
	MENTRY( TABDLY		);
#endif
#ifdef TAB0
	MENTRY( TAB0		);
#endif
#ifdef TAB1
	MENTRY( TAB1		);
#endif
#ifdef TAB2
	MENTRY( TAB2		);
#endif
#ifdef TAB3
	MENTRY( TAB3		);
#endif
#ifdef BSDLY
	MENTRY( BSDLY		);
#endif
#ifdef BS0
	MENTRY( BS0		);
#endif
#ifdef BS1
	MENTRY( BS1		);
#endif
#ifdef VTDLY
	MENTRY( VTDLY		);
#endif
#ifdef VT0
	MENTRY( VT0		);
#endif
#ifdef VT1
	MENTRY( VT1		);
#endif
#ifdef FFDLY
	MENTRY( FFDLY		);
#endif
#ifdef FF0
	MENTRY( FF0		);
#endif
#ifdef FF1
	MENTRY( FF1		);
#endif

	/* cc */
#ifdef VINTR
	MENTRY( VINTR		);
#endif
#ifdef VQUIT
	MENTRY( VQUIT		);
#endif
#ifdef VERASE
	MENTRY( VERASE		);
#endif
#ifdef VKILL
	MENTRY( VKILL		);
#endif
#ifdef VEOF
	MENTRY( VEOF		);
#endif
#ifdef VEOL
	MENTRY( VEOL		);
#endif
#ifdef VEOL2
	MENTRY( VEOL2		);
#endif
#ifdef VMIN
	MENTRY( VMIN		);
#endif
#ifdef VTIME
	MENTRY( VTIME		);
#endif
#ifdef VSTART
	MENTRY( VSTART		);
#endif
#ifdef VSTOP
	MENTRY( VSTOP		);
#endif
#ifdef VSUSP
	MENTRY( VSUSP		);
#endif

	/* XSI extensions - don't use these if you care about portability
	 * to strict POSIX conforming machines, such as Mac OS X.
	 */
#ifdef CBAUD
	MENTRY( CBAUD		);
#endif
#ifdef EXTA
	MENTRY( EXTA		);
#endif
#ifdef EXTB
	MENTRY( EXTB		);
#endif
#ifdef DEFECHO
	MENTRY( DEFECHO		);
#endif
#ifdef ECHOCTL
	MENTRY( ECHOCTL		);
#endif
#ifdef ECHOPRT
	MENTRY( ECHOPRT		);
#endif
#ifdef ECHOKE
	MENTRY( ECHOKE		);
#endif
#ifdef FLUSHO
	MENTRY( FLUSHO		);
#endif
#ifdef PENDIN
	MENTRY( PENDIN		);
#endif
#ifdef LOBLK
	MENTRY( LOBLK		);
#endif
#ifdef SWTCH
	MENTRY( SWTCH		);
#endif
#ifdef VDISCARD
	MENTRY( VDISCARD	);
#endif
#ifdef VDSUSP
	MENTRY( VDSUSP		);
#endif
#ifdef VLNEXT
	MENTRY( VLNEXT		);
#endif
#ifdef VREPRINT
	MENTRY( VREPRINT	);
#endif
#ifdef VSTATUS
	MENTRY( VSTATUS		);
#endif
#ifdef VWERASE
	MENTRY( VWERASE		);
#endif

#if _POSIX_VERSION >= 200112L
	MENTRY( SOMAXCONN	);
	MENTRY( AF_UNSPEC	);
	MENTRY( AF_INET		);
	MENTRY( AF_INET6	);
	MENTRY( SOL_SOCKET	);
	MENTRY( IPPROTO_TCP	);
	MENTRY( IPPROTO_IP	);
	MENTRY( IPPROTO_IPV6	);
	MENTRY( SOCK_STREAM	);
	MENTRY( SOCK_DGRAM	);
	MENTRY( SHUT_RD		);
	MENTRY( SHUT_WR		);
	MENTRY( SHUT_RDWR	);

	MENTRY( SO_ACCEPTCONN	);
	MENTRY( SO_BROADCAST	);
	MENTRY( SO_LINGER	);
	MENTRY( SO_RCVTIMEO	);
	MENTRY( SO_SNDTIMEO	);
	MENTRY( SO_DEBUG	);
	MENTRY( SO_DONTROUTE	);
	MENTRY( SO_ERROR	);
	MENTRY( SO_KEEPALIVE	);
	MENTRY( SO_OOBINLINE	);
	MENTRY( SO_RCVBUF	);
	MENTRY( SO_RCVLOWAT	);
	MENTRY( SO_REUSEADDR	);
	MENTRY( SO_SNDBUF	);
	MENTRY( SO_SNDLOWAT	);
	MENTRY( SO_TYPE		);

	MENTRY( TCP_NODELAY	);

	MENTRY( AI_PASSIVE	);
	MENTRY( AI_CANONNAME	);
	MENTRY( AI_NUMERICHOST	);
	MENTRY( AI_V4MAPPED	);
	MENTRY( AI_ALL		);
	MENTRY( AI_ADDRCONFIG	);

	MENTRY( IPV6_JOIN_GROUP		);
	MENTRY( IPV6_LEAVE_GROUP	);
	MENTRY( IPV6_MULTICAST_HOPS	);
	MENTRY( IPV6_MULTICAST_IF	);
	MENTRY( IPV6_MULTICAST_LOOP	);
	MENTRY( IPV6_UNICAST_HOPS	);
	MENTRY( IPV6_V6ONLY		);
#endif
#undef MENTRY

	/* Signals table stored in registry for Psignal and sig_handle */
	lua_pushlightuserdata(L, &signalL);
	lua_newtable(L);
	lua_rawset(L, LUA_REGISTRYINDEX);

	signalL = L; /* For sig_postpone */

	return 1;
}

/*EOF*/