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/* Determine name of the slave side of a pseudo-terminal.
Copyright (C) 1998, 2002, 2010-2012 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#ifdef _LIBC
# include <paths.h>
#else
# ifndef _PATH_TTY
# define _PATH_TTY "/dev/tty"
# endif
# ifndef _PATH_DEV
# define _PATH_DEV "/dev/"
# endif
# define __set_errno(e) errno = (e)
# define __isatty isatty
# define __stat stat
# define __ttyname_r ttyname_r
# define __ptsname_r ptsname_r
#endif
/* Store at most BUFLEN characters of the pathname of the slave pseudo
terminal associated with the master FD is open on in BUF.
Return 0 on success, otherwise an error number. */
int
__ptsname_r (int fd, char *buf, size_t buflen)
{
int save_errno = errno;
int err;
struct stat st;
if (buf == NULL)
{
__set_errno (EINVAL);
return EINVAL;
}
if (!__isatty (fd))
/* We rely on isatty to set errno properly (i.e. EBADF or ENOTTY). */
return errno;
if (buflen < strlen (_PATH_TTY) + 3)
{
__set_errno (ERANGE);
return ERANGE;
}
err = __ttyname_r (fd, buf, buflen);
if (err != 0)
{
__set_errno (err);
return errno;
}
buf[sizeof (_PATH_DEV) - 1] = 't';
if (__stat (buf, &st) < 0)
return errno;
__set_errno (save_errno);
return 0;
}
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