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/*
* pty.c
*
* pseudo terminal access
*/
#include "fd.h"
#include "sysemu.h"
#include "pathname.h"
#include "termio.h"
#if !MSDOS
#include <grp.h>
#endif
#ifdef SYSV
#include <sys/stropts.h>
#endif
#ifdef GETPGRPVOID
#define getpgroup getpgrp
#else
#define getpgroup() getpgrp(0)
#endif
#ifdef USESETPGID
#define setpgroup setpgid
#else
#define setpgroup setpgrp
#endif
#define TTY_GROUP "tty"
#ifndef _PATH_DEVNULL
#define _PATH_DEVNULL "/dev/null"
#endif
#ifndef _PATH_PTY
#define _PATH_PTY "/dev/pty"
#endif
#ifndef _PATH_DEVPTMX
#define _PATH_DEVPTMX "/dev/ptmx"
#endif
#ifndef _PATH_DEVPTS
#define _PATH_DEVPTS "/dev/pts"
#endif
#if defined (CYGWIN) && (CYGWIN > 1007009)
/* for Cygwin buggy ioctl */
#undef TIOCSCTTY
#endif
#ifdef DEP_PTY
static p_id_t NEAR Xsetsid __P_((VOID_A));
static VOID NEAR Xgrantpt __P_((int, CONST char *));
static VOID NEAR Xunlockpt __P_((int, CONST char *));
static int NEAR Xptsname __P_((int, CONST char *, char *, ALLOC_T));
int Xopenpty __P_((int *, int *, char *, ALLOC_T));
int Xlogin_tty __P_((CONST char *, CONST char *, CONST char *));
p_id_t Xforkpty __P_((int *, CONST char *, CONST char *));
#ifndef USEDEVPTMX
static CONST char pty_char1[] = "pqrstuvwxyzPQRST";
static CONST char pty_char2[] = "0123456789abcdefghijklmnopqrstuv";
#endif
static p_id_t NEAR Xsetsid(VOID_A)
{
#ifdef USESETSID
return(setsid());
#else /* USESETSID */
p_id_t pid;
int fd;
pid = getpid();
if (pid == getpgroup()) {
errno = EPERM;
return((p_id_t)-1);
}
if (setpgroup(0, pid) < 0) return((p_id_t)-1);
# ifdef TIOCNOTTY
if ((fd = Xopen(_PATH_TTY, O_RDWR, 0)) >= 0) {
VOID_C Xioctl(fd, TIOCNOTTY, NULL);
safeclose(fd);
}
# else
if ((fd = Xopen(_PATH_DEVNULL, O_RDWR, 0)) >= 0) {
VOID_C Xdup2(fd, STDIN_FILENO);
VOID_C Xdup2(fd, STDOUT_FILENO);
VOID_C Xdup2(fd, STDERR_FILENO);
safeclose(fd);
}
# endif
return(pid);
#endif /* USESETSID */
}
/*ARGSUSED*/
static VOID NEAR Xgrantpt(fd, path)
int fd;
CONST char *path;
{
#ifdef USEDEVPTMX
extern int grantpt __P_((int)); /* for Linux */
#else
struct group *grp;
gid_t gid;
#endif
#ifdef USEDEVPTMX
VOID_C grantpt(fd);
#else
gid = ((grp = getgrnam(TTY_GROUP))) ? grp -> gr_gid : (gid_t)-1;
VOID_C chown(path, getuid(), gid);
VOID_C chmod(path, 0620);
#endif
}
/*ARGSUSED*/
static VOID NEAR Xunlockpt(fd, path)
int fd;
CONST char *path;
{
#if defined (USEDEVPTMX) && defined (TIOCSPTLCK)
int n;
#endif
#ifdef USEDEVPTMX
# ifdef TIOCSPTLCK
n = 0;
VOID_C Xioctl(fd, TIOCSPTLCK, &n);
# else
VOID_C unlockpt(fd);
# endif
#else /* !USEDEVPTMX */
# ifdef BSD44
VOID_C revoke(path);
# endif
#endif /* !USEDEVPTMX */
}
/*ARGSUSED*/
static int NEAR Xptsname(fd, path, spath, size)
int fd;
CONST char *path;
char *spath;
ALLOC_T size;
{
#if !defined (USEDEVPTMX) || !defined (TIOCGPTN)
char *cp;
#endif
#if defined (USEDEVPTMX) && defined (TIOCGPTN)
int n;
#endif
#ifdef USEDEVPTMX
# ifdef TIOCGPTN
if (Xioctl(fd, TIOCGPTN, &n) < 0) return(-1);
VOID_C Xsnprintf(spath, size, "%s/%d", _PATH_DEVPTS, n);
# else
if (!(cp = ptsname(fd))) return(-1);
VOID_C Xsnprintf(spath, size, "%s", cp);
# endif
#else /* !USEDEVPTMX */
VOID_C Xsnprintf(spath, size, "%s", path);
if ((cp = Xstrrchr(spath, '/'))) *(++cp) = 't';
#endif /* !USEDEVPTMX */
return(0);
}
int Xopenpty(amaster, aslave, spath, size)
int *amaster, *aslave;
char *spath;
ALLOC_T size;
{
#ifndef USEDEVPTMX
CONST char *cp1, *cp2;
int n;
#endif
char path[MAXPATHLEN];
int master, slave;
#ifdef USEDEVPTMX
VOID_C Xsnprintf(path, sizeof(path), "%s", _PATH_DEVPTMX);
if ((master = Xopen(path, O_RDWR, 0)) < 0) return(-1);
Xgrantpt(master, path);
Xunlockpt(master, path);
if (Xptsname(master, path, spath, size) < 0
|| (slave = Xopen(spath, O_RDWR | O_NOCTTY, 0)) < 0) {
safeclose(master);
return(-1);
}
#else /* !USEDEVPTMX */
n = Xsnprintf(path, sizeof(path), "%sXX", _PATH_PTY);
n -= 2;
master = slave = -1;
for (cp1 = pty_char1; *cp1; cp1++) {
path[n] = *cp1;
for (cp2 = pty_char2; *cp2; cp2++) {
path[n + 1] = *cp2;
master = Xopen(path, O_RDWR, 0);
if (master < 0) {
if (errno == ENOENT) break;
continue;
}
VOID_C Xptsname(master, path, spath, size);
Xgrantpt(master, spath);
Xunlockpt(master, spath);
slave = Xopen(spath, O_RDWR, 0);
if (slave >= 0) break;
safeclose(master);
}
if (master >= 0 && slave >= 0) break;
}
if (!*cp1) return(seterrno(ENOENT));
#endif /* !USEDEVPTMX */
*amaster = master;
*aslave = slave;
return(0);
}
#if defined (IRIX) || defined (DECOSF1V2) || defined (DECOSF1V3)
#undef I_PUSH
#endif
int Xlogin_tty(path, tty, ws)
CONST char *path, *tty, *ws;
{
int fd;
VOID_C Xsetsid();
VOID_C Xclose(STDIN_FILENO);
VOID_C Xclose(STDOUT_FILENO);
VOID_C Xclose(STDERR_FILENO);
if ((fd = Xopen(path, O_RDWR, 0)) < 0) return(-1);
#ifdef I_PUSH
if (Xioctl(fd, I_PUSH, "ptem") < 0
|| Xioctl(fd, I_PUSH, "ldterm") < 0) {
VOID_C Xclose(fd);
return(-1);
}
# if defined (SOLARIS) || defined (NEWS_OS6)
VOID_C Xioctl(fd, I_PUSH, "ttcompat");
# endif
#endif /* I_PUSH */
#ifdef TIOCSCTTY
if (Xioctl(fd, TIOCSCTTY, NULL) < 0) {
VOID_C Xclose(fd);
return(-1);
}
#endif
VOID_C Xdup2(fd, STDIN_FILENO);
VOID_C Xdup2(fd, STDOUT_FILENO);
VOID_C Xdup2(fd, STDERR_FILENO);
loadtermio(fd, tty, ws);
safeclose(fd);
return(0);
}
p_id_t Xforkpty(amaster, tty, ws)
int *amaster;
CONST char *tty, *ws;
{
char path[MAXPATHLEN];
p_id_t pid;
u_char uc;
int n, master, slave, fds[2];
if (pipe(fds) < 0) return((p_id_t)-1);
if (Xopenpty(&master, &slave, path, sizeof(path)) < 0) {
pid = (p_id_t)-1;
}
else if ((pid = Xfork()) < (p_id_t)0) {
safeclose(master);
safeclose(slave);
master = -1;
}
else if (pid) {
VOID_C sureread(fds[0], &uc, sizeof(uc));
safeclose(slave);
}
else {
safeclose(master);
safeclose(slave);
master = -1;
n = Xlogin_tty(path, tty, ws);
uc = '\n';
VOID_C surewrite(fds[1], &uc, sizeof(uc));
if (n < 0) _exit(1);
}
safeclose(fds[0]);
safeclose(fds[1]);
*amaster = master;
return(pid);
}
#endif /* DEP_PTY */
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