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/* Determine name of the slave side of a pseudo-terminal.
Copyright (C) 1998, 2002, 2010-2021 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#ifndef _PATH_TTY
# define _PATH_TTY "/dev/tty"
#endif
#ifndef _PATH_DEV
# define _PATH_DEV "/dev/"
#endif
/* Get the major, minor macros. */
#if MAJOR_IN_MKDEV
# include <sys/mkdev.h>
#endif
#if MAJOR_IN_SYSMACROS
# include <sys/sysmacros.h>
#endif
#ifdef __sun
/* Get ioctl() and 'struct strioctl'. */
# include <stropts.h>
/* Get ISPTM. */
# include <sys/stream.h>
# include <sys/ptms.h>
# include <stdio.h>
#endif
#if defined _AIX || defined __osf__
/* Get ioctl(), ISPTM. */
# include <sys/ioctl.h>
# include <stdio.h>
#endif
#if defined __DragonFly__
/* Get fdevname_r(). */
# include <stdlib.h>
#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)
#undef ptsname_r
{
#if HAVE_ESSENTIALLY_WORKING_PTSNAME_R
int ret = ptsname_r (fd, buf, buflen);
if (ret == 0)
return 0;
else
return errno;
#elif defined __DragonFly__
int saved_errno = errno;
char tmpbuf[5 + 4 + 10 + 1];
int ret;
int n;
if (buf == NULL)
{
errno = EINVAL;
return errno;
}
/* The result of fdevname_r is typically of the form ptm/N. */
ret = fdevname_r (fd, tmpbuf + 5, sizeof (tmpbuf) - 5);
if (ret < 0 || strncmp (tmpbuf + 5, "ptm/", 4) != 0)
{
errno = ENOTTY;
return errno;
}
/* Turn it into /dev/pts/N. */
memcpy (tmpbuf, "/dev/pts/", 5 + 4);
n = strlen (tmpbuf);
if (n >= buflen)
{
errno = ERANGE;
return errno;
}
memcpy (buf, tmpbuf, n + 1);
/* Don't do a final stat(), since the file name /dev/pts/N does not actually
exist. */
errno = saved_errno;
return 0;
#else
int saved_errno = errno;
struct stat st;
if (buf == NULL)
{
errno = EINVAL;
return errno;
}
# if defined __sun /* Solaris */
if (fstat (fd, &st) < 0)
return errno;
if (!S_ISCHR (st.st_mode))
{
errno = ENOTTY;
return errno;
}
{
/* Master ptys can be recognized through a STREAMS ioctl. See
"STREAMS-based Pseudo-Terminal Subsystem"
<https://docs.oracle.com/cd/E18752_01/html/816-4855/termsub15-44781.html>
and "STREAMS ioctl commands"
<https://docs.oracle.com/cd/E18752_01/html/816-5177/streamio-7i.html>
*/
struct strioctl ioctl_arg;
ioctl_arg.ic_cmd = ISPTM;
ioctl_arg.ic_timout = 0;
ioctl_arg.ic_len = 0;
ioctl_arg.ic_dp = NULL;
if (ioctl (fd, I_STR, &ioctl_arg) < 0)
{
errno = ENOTTY;
return errno;
}
}
{
char tmpbuf[9 + 10 + 1];
int n = sprintf (tmpbuf, "/dev/pts/%u", minor (st.st_rdev));
if (n >= buflen)
{
errno = ERANGE;
return errno;
}
memcpy (buf, tmpbuf, n + 1);
}
# elif defined _AIX || defined __osf__ /* AIX, OSF/1 */
/* This implementation returns /dev/pts/N, like ptsname() does.
Whereas the generic implementation below returns /dev/ttypN.
Both are correct, but let's be consistent with ptsname(). */
if (fstat (fd, &st) < 0)
return errno;
if (!S_ISCHR (st.st_mode))
{
errno = ENOTTY;
return errno;
}
{
int ret;
int dev;
char tmpbuf[9 + 10 + 1];
int n;
# ifdef _AIX
ret = ioctl (fd, ISPTM, &dev);
# endif
# ifdef __osf__
ret = ioctl (fd, ISPTM, NULL);
dev = ret;
# endif
if (ret < 0)
{
errno = ENOTTY;
return errno;
}
n = sprintf (tmpbuf, "/dev/pts/%u", minor (dev));
if (n >= buflen)
{
errno = ERANGE;
return errno;
}
memcpy (buf, tmpbuf, n + 1);
}
# else
if (!isatty (fd))
{
# if ISATTY_FAILS_WITHOUT_SETTING_ERRNO && defined F_GETFL /* IRIX, Solaris */
/* Set errno. */
if (fcntl (fd, F_GETFL) != -1)
errno = ENOTTY;
# else
/* We rely on isatty to set errno properly (i.e. EBADF or ENOTTY). */
# endif
return errno;
}
if (buflen < strlen (_PATH_TTY) + 3)
{
errno = ERANGE;
return errno;
}
int err = ttyname_r (fd, buf, buflen);
if (err != 0)
{
errno = err;
return errno;
}
if (strncmp(buf, "/dev/pts/", strlen("/dev/pts/")) != 0)
buf[sizeof (_PATH_DEV) - 1] = 't';
# endif
if (stat (buf, &st) < 0 && errno != EOVERFLOW)
return errno;
errno = saved_errno;
return 0;
#endif
}
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