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/*
* pty_getpty: open a PTY master.
* and utmp entries.
*
* Copyright 1990 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. 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 "mit-copyright.h"
#include <com_err.h>
#include "libpty.h"
#include "pty-int.h"
long pty_getpty (fd, slave, slavelength)
int slavelength;
int *fd; char *slave;
{
char c;
char *p;
int i,ptynum;
struct stat stb;
char slavebuf[1024];
#ifdef HAVE_OPENPTY
int slavefd;
if(openpty(fd, &slavefd, slave, (struct termios *) 0,
(struct winsize *) 0)) return 1;
close(slavefd);
return 0;
#else
*fd = open("/dev/ptmx", O_RDWR|O_NDELAY); /* Solaris, IRIX */
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) {
#ifdef HAVE_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 ( strlen(p) > slavelength)
{
close (*fd);
*fd = -1;
return PTY_GETPTY_SLAVE_TOOLONG;
}
strcpy(slave, p);
return 0;
}
if (fstat(*fd, &stb) < 0) {
close(*fd);
return PTY_GETPTY_FSTAT;
}
ptynum = (int)(stb.st_rdev&0xFF);
sprintf(slavebuf, "/dev/ttyp%x", ptynum);
if ( strlen(slavebuf) > slavelength) {
close(*fd);
*fd = -1;
return PTY_GETPTY_SLAVE_TOOLONG;
}
strncpy ( slave, slavebuf, slavelength);
return 0;
} else {
for (c = 'p'; c <= 's'; c++) {
sprintf(slavebuf,"/dev/ptyXX");
slavebuf[strlen("/dev/pty")] = c;
slavebuf[strlen("/dev/ptyp")] = '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[strlen("/dev/")] = 't';
if ( strlen(slavebuf) < slavelength ) {
close ( *fd);
*fd = -1;
return PTY_GETPTY_SLAVE_TOOLONG;
}
strncpy ( slave, slavebuf, slavelength);
return 0;
}
}
return PTY_GETPTY_NOPTY;
}
#endif /* HAVE_OPENPTY */
}
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