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/*
* termio.c
*
* terminal I/O
*/
#include "headers.h"
#include "depend.h"
#include "typesize.h"
#include "sysemu.h"
#include "termio.h"
#include "unixemu.h"
#ifdef USESELECTH
#include <sys/select.h>
#endif
#if MSDOS
# ifdef USERESOURCEH
# include <sys/time.h>
# include <sys/resource.h>
# endif
#else /* !MSDOS */
# ifdef USERESOURCEH
# include <sys/resource.h>
# endif
# ifdef USEULIMITH
# include <ulimit.h>
# endif
#endif /* !MSDOS */
#if defined (USESYSCONF) && defined (_SC_OPEN_MAX)
#define MAXOPENFILE sysconf(_SC_OPEN_MAX)
#else /* !USESYSCONF || !_SC_OPEN_MAX */
# ifdef NOFILE
# define MAXOPENFILE NOFILE
# else /* !NOFILE */
# ifdef OPEN_MAX
# define MAXOPENFILE OPEN_MAX
# else /* !OPEN_MAX */
# if MSDOS
# define MAXOPENFILE 20
# else
# define MAXOPENFILE 64
# endif
# endif /* !OPEN_MAX */
# endif /* !NOFILE */
#endif /* !USESYSCONF || !_SC_OPEN_MAX */
#ifndef _PATH_TTY
# if MSDOS
# define _PATH_TTY "CON"
# else
# define _PATH_TTY "/dev/tty"
# endif
#endif /* !_PATH_TTY */
#ifndef UL_GDESLIM
#define UL_GDESLIM 4
#endif
#ifndef FD_CLOEXEC
#define FD_CLOEXEC 1
#endif
#if !defined (RLIMIT_NOFILE) && defined (RLIMIT_OFILE)
#define RLIMIT_NOFILE RLIMIT_OFILE
#endif
#ifdef USETERMIO
#undef VSTART
#undef VSTOP
#endif
#define K_CTRL(c) ((c) & 037)
#define MAXFDSET 256
#define MAXSELECT 16
#ifndef FD_SET
typedef struct fd_set {
u_int fds_bits[1];
} fd_set;
# define FD_SET(n, p) (((p) -> fds_bits[0]) |= ((u_int)1 << (n)))
# define FD_ISSET(n, p) (((p) -> fds_bits[0]) & ((u_int)1 << (n)))
# define FD_ZERO(p) (((p) -> fds_bits[0]) = 0)
# undef MAXFDSET
# define MAXFDSET (BITSPERBYTE * sizeof(u_int))
#endif /* !FD_SET */
#if !MSDOS && defined (FD) && !defined (NOSELECT)
extern VOID checksuspend __P_((VOID));
#endif
#ifdef DEP_ORIGSHELL
extern int interrupted;
#endif
#ifdef LSI_C
extern u_char _openfile[];
#endif
#if MSDOS
static CONST u_short doserrlist[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 15, 17, 18, 65, 80
};
#define DOSERRLISTSIZ arraysize(doserrlist)
static CONST int unixerrlist[] = {
0, EINVAL, ENOENT, ENOENT, EMFILE, EACCES,
EBADF, ENOMEM, ENOMEM, ENOMEM, ENODEV, EXDEV, 0, EACCES, EEXIST
};
#endif /* MSDOS */
#ifdef CYGWIN
static int save_ttyio = -1;
#endif
#ifdef LSI_C
int safe_dup(oldd)
int oldd;
{
int fd;
if ((fd = dup(oldd)) < 0) return(-1);
if (fd < SYS_OPEN && oldd >= 0 && oldd < SYS_OPEN)
_openfile[fd] = _openfile[oldd];
return(fd);
}
int safe_dup2(oldd, newd)
int oldd, newd;
{
int fd;
if (oldd == newd) return(newd);
if ((fd = dup2(oldd, newd)) < 0) return(-1);
if (newd >= 0 && newd < SYS_OPEN && oldd >= 0 && oldd < SYS_OPEN)
_openfile[newd] = _openfile[oldd];
return(fd);
}
#endif /* LSI_C */
#if MSDOS
VOID dosseterrno(doserr)
u_int doserr;
{
int i;
for (i = 0; i < DOSERRLISTSIZ; i++) if (doserr == doserrlist[i]) {
errno = unixerrlist[i];
return;
}
errno = EINVAL;
}
int intcall(vect, regp, sregp)
int vect;
__dpmi_regs *regp;
struct SREGS *sregp;
{
# ifdef __TURBOC__
struct REGPACK preg;
# endif
(*regp).x.flags |= FR_CARRY;
# ifdef __TURBOC__
preg.r_ax = (*regp).x.ax;
preg.r_bx = (*regp).x.bx;
preg.r_cx = (*regp).x.cx;
preg.r_dx = (*regp).x.dx;
preg.r_bp = (*regp).x.bp;
preg.r_si = (*regp).x.si;
preg.r_di = (*regp).x.di;
preg.r_ds = (*sregp).ds;
preg.r_es = (*sregp).es;
preg.r_flags = (*regp).x.flags;
intr(vect, &preg);
(*regp).x.ax = preg.r_ax;
(*regp).x.bx = preg.r_bx;
(*regp).x.cx = preg.r_cx;
(*regp).x.dx = preg.r_dx;
(*regp).x.bp = preg.r_bp;
(*regp).x.si = preg.r_si;
(*regp).x.di = preg.r_di;
(*sregp).ds = preg.r_ds;
(*sregp).es = preg.r_es;
(*regp).x.flags = preg.r_flags;
# else /* !__TURBOC__ */
# ifdef DJGPP
(*regp).x.ds = (*sregp).ds;
(*regp).x.es = (*sregp).es;
__dpmi_int(vect, regp);
(*sregp).ds = (*regp).x.ds;
(*sregp).es = (*regp).x.es;
# else
int86x(vect, regp, regp, sregp);
# endif
# endif /* !__TURBOC__ */
if (!((*regp).x.flags & FR_CARRY)) return(0);
dosseterrno((*regp).x.ax);
return(-1);
}
#endif /* MSDOS */
int Xgetdtablesize(VOID_A)
{
#if !MSDOS
# ifndef SYSV
int n;
# else /* SYSV */
# ifdef USERESOURCEH
struct rlimit lim;
# else /* !USERESOURCEH */
# ifdef USEULIMITH
long n;
# endif
# endif /* !USERESOURCEH */
# endif /* SYSV */
#endif /* !MSDOS */
#if !MSDOS
# ifndef SYSV
if ((n = getdtablesize()) >= 0) return(n);
# else /* SYSV */
# ifdef USERESOURCEH
if (getrlimit(RLIMIT_NOFILE, &lim) >= 0) return(lim.rlim_cur);
# else /* !USERESOURCEH */
# ifdef USEULIMITH
if ((n = ulimit(UL_GDESLIM, 0L)) >= 0L) return((int)n);
# endif
# endif /* !USERESOURCEH */
# endif /* SYSV */
#endif /* !MSDOS */
return(MAXOPENFILE);
}
int isvalidfd(fd)
int fd;
{
#if MSDOS
struct SREGS sreg;
__dpmi_regs reg;
#endif
#if MSDOS
reg.x.ax = 0x4400;
reg.x.bx = fd;
return(intcall(0x21, ®, &sreg));
#else
return(fcntl(fd, F_GETFD, NULL));
#endif
}
int newdup(fd)
int fd;
{
int n;
if (fd < 0
|| fd == STDIN_FILENO || fd == STDOUT_FILENO || fd == STDERR_FILENO)
return(fd);
#ifdef DEP_DOSDRIVE
if (chkopenfd(fd) == DEV_DOS) return(fd);
#endif
n = Xgetdtablesize();
for (n--; n > fd; n--) if (isvalidfd(n) < 0) break;
if (n <= fd || Xdup2(fd, n) < 0) return(fd);
VOID_C Xclose(fd);
return(n);
}
int sureread(fd, buf, nbytes)
int fd;
VOID_P buf;
int nbytes;
{
int n;
for (;;) {
#ifdef DEP_ORIGSHELL
if (interrupted) {
n = seterrno(EINTR);
break;
}
#endif
if ((n = Xread(fd, buf, nbytes)) >= 0) {
errno = 0;
return(n);
}
#ifdef EAGAIN
else if (errno == EAGAIN) continue;
#endif
#ifdef EWOULDBLOCK
else if (errno == EWOULDBLOCK) continue;
#endif
else if (errno != EINTR) break;
}
return(-1);
}
int surewrite(fd, buf, nbytes)
int fd;
CONST VOID_P buf;
int nbytes;
{
char *cp;
int n;
cp = (char *)buf;
for (;;) {
#ifdef DEP_ORIGSHELL
if (interrupted) {
n = seterrno(EINTR);
break;
}
#endif
if ((n = Xwrite(fd, cp, nbytes)) >= 0) {
if (n >= nbytes) {
errno = 0;
return(0);
}
#if MSDOS
if (!n) {
errno = ENOSPC;
break;
}
#endif
cp += n;
nbytes -= n;
}
#ifdef EAGAIN
else if (errno == EAGAIN) continue;
#endif
#ifdef EWOULDBLOCK
else if (errno == EWOULDBLOCK) continue;
#endif
else if (errno != EINTR) break;
}
return(-1);
}
VOID safeclose(fd)
int fd;
{
int duperrno;
if (fd < 0) return;
duperrno = errno;
if (fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO)
VOID_C Xclose(fd);
errno = duperrno;
}
VOID safefclose(fp)
XFILE *fp;
{
int fd, duperrno;
if (!fp) return;
duperrno = errno;
fd = Xfileno(fp);
if (fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO)
VOID_C Xfclose(fp);
errno = duperrno;
}
int opentty(fdp, fpp)
int *fdp;
XFILE **fpp;
{
XFILE *fp;
int fd, flags;
#ifdef SELECTRWONLY
flags = O_RDONLY;
#else
flags = O_RDWR;
#endif
if (*fdp >= 0) fd = *fdp;
else if ((fd = newdup(Xopen(_PATH_TTY, flags, 0666))) < 0) return(-1);
if (*fpp) fp = *fpp;
#ifndef SELECTRWONLY
else if ((fp = Xfdopen(fd, "w+b"))) /*EMPTY*/;
#endif
else if (!(fp = Xfopen(_PATH_TTY, "w+b"))) {
VOID_C Xclose(fd);
return(-1);
}
*fdp = fd;
*fpp = fp;
#ifdef CYGWIN
save_ttyio = fd;
#endif
return(0);
}
VOID closetty(fdp, fpp)
int *fdp;
XFILE **fpp;
{
if (*fpp) {
if (Xfileno(*fpp) == *fdp) *fdp = -1;
VOID_C Xfclose(*fpp);
}
if (*fdp >= 0) VOID_C Xclose(*fdp);
*fdp = -1;
*fpp = NULL;
}
#if !MSDOS
VOID closeonexec(fd)
int fd;
{
int n;
if (fd >= 0 && (n = fcntl(fd, F_GETFD, NULL)) >= 0)
VOID_C fcntl(fd, F_SETFD, n | FD_CLOEXEC);
}
int Xioctl(fd, request, argp)
int fd, request;
VOID_P argp;
{
for (;;) {
if (ioctl(fd, request, argp) >= 0) {
errno = 0;
return(0);
}
# ifdef EAGAIN
else if (errno == EAGAIN) continue;
# endif
# ifdef EWOULDBLOCK
else if (errno == EWOULDBLOCK) continue;
# endif
else if (errno != EINTR) break;
}
return(-1);
}
# ifdef USETERMIOS
int Xtcgetattr(fd, t)
int fd;
termioctl_t *t;
{
for (;;) {
if (tcgetattr(fd, t) >= 0) {
errno = 0;
return(0);
}
# ifdef EAGAIN
else if (errno == EAGAIN) continue;
# endif
# ifdef EWOULDBLOCK
else if (errno == EWOULDBLOCK) continue;
# endif
else if (errno != EINTR) break;
}
return(-1);
}
int Xtcsetattr(fd, action, t)
int fd, action;
CONST termioctl_t *t;
{
for (;;) {
if (tcsetattr(fd, action, t) >= 0) {
errno = 0;
return(0);
}
# ifdef EAGAIN
else if (errno == EAGAIN) continue;
# endif
# ifdef EWOULDBLOCK
else if (errno == EWOULDBLOCK) continue;
# endif
else if (errno != EINTR) break;
}
return(-1);
}
int Xtcflush(fd, selector)
int fd, selector;
{
for (;;) {
if (tcflush(fd, selector) >= 0) {
errno = 0;
return(0);
}
# ifdef EAGAIN
else if (errno == EAGAIN) continue;
# endif
# ifdef EWOULDBLOCK
else if (errno == EWOULDBLOCK) continue;
# endif
else if (errno != EINTR) break;
}
return(-1);
}
# endif /* USETERMIOS */
#endif /* !MSDOS */
#if defined (FD) || defined (CYGWIN)
/*ARGSUSED*/
VOID loadtermio(fd, tty, ws)
int fd;
CONST char *tty, *ws;
{
# if MSDOS
# ifndef DJGPP
union REGS reg;
# endif
# else /* !MSDOS */
ALLOC_T size;
# endif /* !MSDOS */
if (fd < 0) return;
# if MSDOS
# ifndef DJGPP
if (tty) {
reg.x.ax = 0x3301;
memcpy((char *)&(reg.h.dl), (char *)tty, sizeof(reg.h.dl));
int86(0x21, ®, ®);
}
# endif
# else /* !MSDOS */
if (tty) {
size = (ALLOC_T)0;
VOID_C tioctl(fd, REQSETN, (termioctl_t *)&(tty[size]));
# ifdef USESGTTY
size += sizeof(termioctl_t);
VOID_C Xioctl(fd, TIOCLSET, (int *)&(tty[size]));
size += sizeof(int);
VOID_C Xioctl(fd, TIOCSETC, (struct tchars *)&(tty[size]));
# endif
}
# ifndef NOTERMWSIZE
if (ws) VOID_C Xioctl(fd, REQSETWS, (termwsize_t *)ws);
# endif
# endif /* !MSDOS */
}
VOID savetermio(fd, ttyp, wsp)
int fd;
char **ttyp, **wsp;
{
# if MSDOS
# ifndef DJGPP
union REGS reg;
char *tty;
# endif
# else /* !MSDOS */
# ifndef NOTERMWSIZE
char *ws;
# endif
ALLOC_T size;
char *tty;
# endif /* !MSDOS */
if (fd < 0) return;
# if MSDOS
if (ttyp) do {
*ttyp = NULL;
# ifndef DJGPP
if (!(tty = (char *)malloc(TIO_BUFSIZ))) break;
reg.x.ax = 0x3300;
int86(0x21, ®, ®);
memcpy((char *)tty, (char *)&(reg.h.dl), TIO_BUFSIZ);
*ttyp = tty;
# endif /* !DJGPP */
} while (0);
if (wsp) *wsp = NULL;
# else /* !MSDOS */
if (ttyp) do {
*ttyp = NULL;
if (!(tty = (char *)malloc(TIO_BUFSIZ))) break;
size = (ALLOC_T)0;
if (tioctl(fd, REQGETP, (termioctl_t *)&(tty[size])) < 0) {
free(tty);
break;
}
# ifdef USESGTTY
size += sizeof(termioctl_t);
if (Xioctl(fd, TIOCLGET, (int *)&(tty[size])) < 0) {
free(tty);
break;
}
size += sizeof(int);
if (Xioctl(fd, TIOCGETC, (struct tchars *)&(tty[size])) < 0) {
free(tty);
break;
}
# endif /* USESGTTY */
*ttyp = tty;
} while (0);
if (wsp) do {
*wsp = NULL;
# ifndef NOTERMWSIZE
if (!(ws = (char *)malloc(TIO_WINSIZ))) break;
if (Xioctl(fd, REQGETWS, (termwsize_t *)ws) < 0) {
free(ws);
break;
}
*wsp = ws;
# endif /* !NOTERMWSIZE */
} while (0);
# endif /* !MSDOS */
}
#endif /* FD || CYGWIN */
#ifdef CYGWIN
p_id_t Xfork(VOID_A)
{
p_id_t pid;
char *buf;
/* Cygwin's fork() breaks ISIG */
savetermio(save_ttyio, &buf, NULL);
pid = fork();
loadtermio(save_ttyio, buf, NULL);
if (buf) free(buf);
return(pid);
}
#endif /* CYGWIN */
#ifndef NOSELECT
int sureselect(nfd, fds, result, vp, flags)
int nfd, fds[];
char result[];
VOID_P vp;
int flags;
{
fd_set *readfds, *writefds, set;
int i, n, max, dupfds[MAXSELECT];
if (flags & SEL_WRITE) {
readfds = NULL;
writefds = &set;
}
else {
readfds = &set;
writefds = NULL;
}
FD_ZERO(&set);
max = -1;
if (nfd > MAXSELECT) nfd = MAXSELECT;
for (i = 0; i < nfd; i++) {
dupfds[i] = fds[i];
if (result) result[i] = 0;
if (fds[i] < 0) continue;
if (fds[i] >= MAXFDSET && (n = safe_dup(fds[i])) >= 0)
dupfds[i] = n;
if (dupfds[i] > max) max = dupfds[i];
FD_SET(dupfds[i], &set);
}
if (max++ < 0) return(0);
for (;;) {
# ifdef DEP_ORIGSHELL
if (interrupted) {
n = seterrno(EINTR);
break;
}
# endif
# if !MSDOS && defined (FD)
if (flags & SEL_TTYIO) checksuspend();
# endif
n = select(max, readfds, writefds, NULL, (struct timeval *)vp);
if (n >= 0 || errno != EINTR) break;
if (flags & SEL_NOINTR) break;
}
for (i = 0; i < nfd; i++)
if (dupfds[i] != fds[i]) safeclose(dupfds[i]);
if (n <= 0) return(n);
if (result) for (i = 0; i < nfd; i++) {
if (dupfds[i] < 0) continue;
if (FD_ISSET(dupfds[i], &set)) result[i] = 1;
}
return(n);
}
#endif /* !NOSELECT */
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