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/**************************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
#define CAML_INTERNALS
#include <errno.h>
#include <math.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <caml/mlvalues.h>
#include <caml/memory.h>
#include <caml/alloc.h>
#include <caml/signals.h>
#include <caml/io.h>
#include "caml/unixsupport.h"
#include "cst2constr.h"
#ifndef S_IFLNK
#define S_IFLNK 0
#endif
#ifndef S_IFIFO
#define S_IFIFO 0
#endif
#ifndef S_IFSOCK
#define S_IFSOCK 0
#endif
#ifndef S_IFBLK
#define S_IFBLK 0
#endif
#ifndef EOVERFLOW
#define EOVERFLOW ERANGE
#endif
static const int file_kind_table[] = {
S_IFREG, S_IFDIR, S_IFCHR, S_IFBLK, S_IFLNK, S_IFIFO, S_IFSOCK
};
/* Transform a (seconds, nanoseconds) time stamp (in the style of
struct timespec) to a number of seconds in floating-point.
Make sure the integer part of the result is always equal to [seconds]
(issue #9490). */
static double stat_timestamp(time_t sec, long nsec)
{
/* The conversion of sec to FP is exact for the foreseeable future.
(It starts rounding when sec > 2^53, i.e. in 285 million years.) */
double s = (double) sec;
/* The conversion of nsec to fraction of seconds can round.
Still, we have 0 <= n < 1.0. */
double n = (double) nsec / 1e9;
/* The sum s + n can round up, hence s <= t + <= s + 1.0 */
double t = s + n;
/* Detect the "round up to s + 1" case and decrease t so that
its integer part is s. */
if (t == s + 1.0) t = nextafter(t, s);
return t;
}
static value stat_aux(int use_64, struct stat *buf)
{
CAMLparam0();
CAMLlocal5(atime, mtime, ctime, offset, v);
#if defined(HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC)
# define NSEC(buf, field) buf->st_##field##tim.tv_nsec
#elif defined(HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC)
# define NSEC(buf, field) buf->st_##field##timespec.tv_nsec
#elif defined(HAVE_STRUCT_STAT_ST_ATIMENSEC)
# define NSEC(buf, field) buf->st_##field##timensec
#else
# define NSEC(buf, field) 0
#endif
atime = caml_copy_double(stat_timestamp(buf->st_atime, NSEC(buf, a)));
mtime = caml_copy_double(stat_timestamp(buf->st_mtime, NSEC(buf, m)));
ctime = caml_copy_double(stat_timestamp(buf->st_ctime, NSEC(buf, c)));
#undef NSEC
offset = use_64 ? Val_file_offset(buf->st_size) : Val_int (buf->st_size);
v = caml_alloc_small(12, 0);
Field (v, 0) = Val_int (buf->st_dev);
Field (v, 1) = Val_int (buf->st_ino);
Field (v, 2) = caml_unix_cst_to_constr(buf->st_mode & S_IFMT, file_kind_table,
sizeof(file_kind_table) / sizeof(int), 0);
Field (v, 3) = Val_int (buf->st_mode & 07777);
Field (v, 4) = Val_int (buf->st_nlink);
Field (v, 5) = Val_int (buf->st_uid);
Field (v, 6) = Val_int (buf->st_gid);
Field (v, 7) = Val_int (buf->st_rdev);
Field (v, 8) = offset;
Field (v, 9) = atime;
Field (v, 10) = mtime;
Field (v, 11) = ctime;
CAMLreturn(v);
}
CAMLprim value caml_unix_stat(value path)
{
CAMLparam1(path);
int ret;
struct stat buf;
char * p;
caml_unix_check_path(path, "stat");
p = caml_stat_strdup(String_val(path));
caml_enter_blocking_section();
ret = stat(p, &buf);
caml_leave_blocking_section();
caml_stat_free(p);
if (ret == -1) caml_uerror("stat", path);
if (buf.st_size > Max_long && (buf.st_mode & S_IFMT) == S_IFREG)
caml_unix_error(EOVERFLOW, "stat", path);
CAMLreturn(stat_aux(0, &buf));
}
CAMLprim value caml_unix_lstat(value path)
{
CAMLparam1(path);
int ret;
struct stat buf;
char * p;
caml_unix_check_path(path, "lstat");
p = caml_stat_strdup(String_val(path));
caml_enter_blocking_section();
#ifdef HAS_SYMLINK
ret = lstat(p, &buf);
#else
ret = stat(p, &buf);
#endif
caml_leave_blocking_section();
caml_stat_free(p);
if (ret == -1) caml_uerror("lstat", path);
if (buf.st_size > Max_long && (buf.st_mode & S_IFMT) == S_IFREG)
caml_unix_error(EOVERFLOW, "lstat", path);
CAMLreturn(stat_aux(0, &buf));
}
CAMLprim value caml_unix_fstat(value fd)
{
int ret;
struct stat buf;
caml_enter_blocking_section();
ret = fstat(Int_val(fd), &buf);
caml_leave_blocking_section();
if (ret == -1) caml_uerror("fstat", Nothing);
if (buf.st_size > Max_long && (buf.st_mode & S_IFMT) == S_IFREG)
caml_unix_error(EOVERFLOW, "fstat", Nothing);
return stat_aux(0, &buf);
}
CAMLprim value caml_unix_stat_64(value path)
{
CAMLparam1(path);
int ret;
struct stat buf;
char * p;
caml_unix_check_path(path, "stat");
p = caml_stat_strdup(String_val(path));
caml_enter_blocking_section();
ret = stat(p, &buf);
caml_leave_blocking_section();
caml_stat_free(p);
if (ret == -1) caml_uerror("stat", path);
CAMLreturn(stat_aux(1, &buf));
}
CAMLprim value caml_unix_lstat_64(value path)
{
CAMLparam1(path);
int ret;
struct stat buf;
char * p;
caml_unix_check_path(path, "lstat");
p = caml_stat_strdup(String_val(path));
caml_enter_blocking_section();
#ifdef HAS_SYMLINK
ret = lstat(p, &buf);
#else
ret = stat(p, &buf);
#endif
caml_leave_blocking_section();
caml_stat_free(p);
if (ret == -1) caml_uerror("lstat", path);
CAMLreturn(stat_aux(1, &buf));
}
CAMLprim value caml_unix_fstat_64(value fd)
{
int ret;
struct stat buf;
caml_enter_blocking_section();
ret = fstat(Int_val(fd), &buf);
caml_leave_blocking_section();
if (ret == -1) caml_uerror("fstat", Nothing);
return stat_aux(1, &buf);
}
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