mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-16 18:10:11 +00:00
139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
/* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <limits.h>
|
|
#include <pty.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <termios.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
|
|
|
|
/* Return the result of ptsname_r in the buffer pointed to by PTS,
|
|
which should be of length BUF_LEN. If it is too long to fit in
|
|
this buffer, a sufficiently long buffer is allocated using malloc,
|
|
and returned in PTS. 0 is returned upon success, -1 otherwise. */
|
|
static int
|
|
pts_name (int fd, char **pts, size_t buf_len)
|
|
{
|
|
int rv;
|
|
char *buf = *pts;
|
|
|
|
for (;;)
|
|
{
|
|
char *new_buf;
|
|
|
|
if (buf_len)
|
|
{
|
|
rv = ptsname_r (fd, buf, buf_len);
|
|
|
|
if (rv != 0 || memchr (buf, '\0', buf_len))
|
|
/* We either got an error, or we succeeded and the
|
|
returned name fit in the buffer. */
|
|
break;
|
|
|
|
/* Try again with a longer buffer. */
|
|
buf_len += buf_len; /* Double it */
|
|
}
|
|
else
|
|
/* No initial buffer; start out by mallocing one. */
|
|
buf_len = 128; /* First time guess. */
|
|
|
|
if (buf != *pts)
|
|
/* We've already malloced another buffer at least once. */
|
|
new_buf = realloc (buf, buf_len);
|
|
else
|
|
new_buf = malloc (buf_len);
|
|
if (! new_buf)
|
|
{
|
|
rv = -1;
|
|
__set_errno (ENOMEM);
|
|
break;
|
|
}
|
|
buf = new_buf;
|
|
}
|
|
|
|
if (rv == 0)
|
|
*pts = buf; /* Return buffer to the user. */
|
|
else if (buf != *pts)
|
|
free (buf); /* Free what we malloced when returning an error. */
|
|
|
|
return rv;
|
|
}
|
|
|
|
/* Create pseudo tty master slave pair and set terminal attributes
|
|
according to TERMP and WINP. Return handles for both ends in
|
|
AMASTER and ASLAVE, and return the name of the slave end in NAME. */
|
|
int
|
|
openpty (int *amaster, int *aslave, char *name, struct termios *termp,
|
|
struct winsize *winp)
|
|
{
|
|
#ifdef PATH_MAX
|
|
char _buf[PATH_MAX];
|
|
#else
|
|
char _buf[512];
|
|
#endif
|
|
char *buf = _buf;
|
|
int master, slave;
|
|
|
|
master = getpt ();
|
|
if (master == -1)
|
|
return -1;
|
|
|
|
if (grantpt (master))
|
|
goto fail;
|
|
|
|
if (unlockpt (master))
|
|
goto fail;
|
|
|
|
if (pts_name (master, &buf, sizeof (_buf)))
|
|
goto fail;
|
|
|
|
slave = open (buf, O_RDWR | O_NOCTTY);
|
|
if (slave == -1)
|
|
{
|
|
if (buf != _buf)
|
|
free (buf);
|
|
|
|
goto fail;
|
|
}
|
|
|
|
/* XXX Should we ignore errors here? */
|
|
if(termp)
|
|
tcsetattr (slave, TCSAFLUSH, termp);
|
|
if (winp)
|
|
ioctl (slave, TIOCSWINSZ, winp);
|
|
|
|
*amaster = master;
|
|
*aslave = slave;
|
|
if (name != NULL)
|
|
strcpy (name, buf);
|
|
|
|
if (buf != _buf)
|
|
free (buf);
|
|
return 0;
|
|
|
|
fail:
|
|
close (master);
|
|
return -1;
|
|
}
|