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/*
* pty_getpty: open a PTY master.
*
* Copyright 1995, 1996 by the Massachusetts Institute of Technology.
*
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that the above copyright notice appear in all
* copies and that both that copyright notice and this permission
* notice appear in supporting documentation, and that the name of
* M.I.T. not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability
* of this software for any purpose. It is provided "as is" without
* express or implied warranty.
*
*/
#include "com_err.h"
#include "libpty.h"
#include "pty-int.h"
#include "k5-platform.h"
long
ptyint_getpty_ext(int *fd, char *slave, int slavelength, int do_grantpt)
{
#if !defined(HAVE__GETPTY) && !defined(HAVE_OPENPTY)
char *cp;
char *p;
int i,ptynum;
struct stat stb;
char slavebuf[1024];
#endif
#ifdef HAVE__GETPTY
char *slaveret; /*Temporary to hold pointer to slave*/
#endif /*HAVE__GETPTY*/
#ifdef HAVE_OPENPTY
int slavefd;
if(openpty(fd, &slavefd, slave, (struct termios *) 0,
(struct winsize *) 0)) return 1;
close(slavefd);
return 0;
#else /*HAVE_OPENPTY*/
#ifdef HAVE__GETPTY
/* This code is included for Irix; as of version 5.3, Irix has /dev/ptmx,
* but it fails to work properly; even after calling unlockpt,
* root gets permission denied opening the pty.
* The code to support _getpty should be removed if Irix gets working
* streams ptys in favor of maintaining the least needed code
* paths.
*/
if ((slaveret = _getpty(fd, O_RDWR|O_NDELAY, 0600, 0)) == 0) {
*fd = -1;
return PTY_GETPTY_NOPTY;
}
if (strlcpy(slave, slaveret, slavelength) >= slavelength) {
close(*fd);
*fd = -1;
return PTY_GETPTY_SLAVE_TOOLONG;
}
return 0;
#else /*HAVE__GETPTY*/
*fd = open("/dev/ptym/clone", O_RDWR|O_NDELAY); /* HPUX*/
#ifdef HAVE_STREAMS
if (*fd < 0) *fd = open("/dev/ptmx",O_RDWR|O_NDELAY); /*Solaris*/
#endif
if (*fd < 0) *fd = open("/dev/ptc", O_RDWR|O_NDELAY); /* AIX */
if (*fd < 0) *fd = open("/dev/pty", O_RDWR|O_NDELAY); /* sysvimp */
if (*fd >= 0) {
#if defined(HAVE_GRANTPT)&&defined(HAVE_STREAMS)
if (do_grantpt)
if (grantpt(*fd) || unlockpt(*fd)) return PTY_GETPTY_STREAMS;
#endif
#ifdef HAVE_PTSNAME
p = ptsname(*fd);
#else
#ifdef HAVE_TTYNAME
p = ttyname(*fd);
#else
/* XXX If we don't have either what do we do */
#endif
#endif
if (p) {
if (strlcpy(slave, p, slavelength) >= slavelength) {
close (*fd);
*fd = -1;
return PTY_GETPTY_SLAVE_TOOLONG;
}
return 0;
}
if (fstat(*fd, &stb) < 0) {
close(*fd);
return PTY_GETPTY_FSTAT;
}
ptynum = (int)(stb.st_rdev&0xFF);
snprintf(slavebuf, sizeof(slavebuf), "/dev/ttyp%x", ptynum);
if (strlen(slavebuf) > slavelength - 1) {
close(*fd);
*fd = -1;
return PTY_GETPTY_SLAVE_TOOLONG;
}
strncpy(slave, slavebuf, slavelength);
return 0;
} else {
for (cp = "pqrstuvwxyzPQRST";*cp; cp++) {
snprintf(slavebuf,sizeof(slavebuf),"/dev/ptyXX");
slavebuf[sizeof("/dev/pty") - 1] = *cp;
slavebuf[sizeof("/dev/ptyp") - 1] = '0';
if (stat(slavebuf, &stb) < 0)
break;
for (i = 0; i < 16; i++) {
slavebuf[sizeof("/dev/ptyp") - 1] = "0123456789abcdef"[i];
*fd = open(slavebuf, O_RDWR);
if (*fd < 0) continue;
/* got pty */
slavebuf[sizeof("/dev/") - 1] = 't';
if (strlen(slavebuf) > slavelength -1) {
close(*fd);
*fd = -1;
return PTY_GETPTY_SLAVE_TOOLONG;
}
strncpy(slave, slavebuf, slavelength);
return 0;
}
}
return PTY_GETPTY_NOPTY;
}
#endif /*HAVE__GETPTY*/
#endif /* HAVE_OPENPTY */
}
long
pty_getpty(int *fd, char *slave, int slavelength)
{
return ptyint_getpty_ext(fd, slave, slavelength, 1);
}
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