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/* Open the master side of a pseudo-terminal.
Copyright (C) 2010-2023 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>
#if defined __OpenBSD__
# include <sys/ioctl.h>
# include <sys/tty.h>
#endif
/* posix_openpt() is already provided on
glibc >= 2.2.1 (but is a stub on GNU/Hurd),
Mac OS X >= 10.4,
FreeBSD >= 5.1 (lived in src/lib/libc/stdlib/grantpt.c before 8.0),
NetBSD >= 3.0,
AIX >= 5.2, HP-UX >= 11.31, Solaris >= 10, Cygwin >= 1.7.
Thus, this replacement function is compiled on
Mac OS X 10.3, OpenBSD 4.9, Minix 3.1.8,
AIX 5.1, HP-UX 11.23, IRIX 6.5, OSF/1 5.1, Solaris 9,
Cygwin 1.5.x, mingw, MSVC 9, Interix 3.5, BeOS.
Among these:
- AIX has /dev/ptc.
- HP-UX 10..11, IRIX 6.5, OSF/1 5.1, Solaris 2.6..9, Cygwin 1.5
have /dev/ptmx.
- HP-UX 10..11 also has /dev/ptym/clone, but this should not be needed.
- OpenBSD 4.9 has /dev/ptm and the PTMGET ioctl.
- Minix 3.1.8 have a list of pseudo-terminal devices in /dev.
- On native Windows, there are no ttys at all. */
int
posix_openpt (int flags)
{
int master;
#ifdef _AIX /* AIX */
master = open ("/dev/ptc", flags);
#elif defined _WIN32 && !defined __CYGWIN__ /* mingw */
/* Mingw lacks pseudo-terminals altogether. */
master = -1;
errno = ENOSYS;
#elif defined __OpenBSD__
/* On OpenBSD, master and slave of a pseudo-terminal are allocated together,
by opening /dev/ptm and applying the PTMGET ioctl to it. */
int fd;
struct ptmget data;
fd = open (PATH_PTMDEV, O_RDWR);
if (fd >= 0)
{
if (ioctl (fd, PTMGET, &data) >= 0)
{
master = data.cfd;
close (data.sfd);
close (fd);
}
else
{
int saved_errno = errno;
close (fd);
errno = saved_errno;
master = -1;
}
}
else
master = -1;
#else /* Mac OS X, Minix, HP-UX, IRIX, OSF/1, Solaris 9, Cygwin 1.5 */
/* Most systems that lack posix_openpt() have /dev/ptmx. */
master = open ("/dev/ptmx", flags);
/* If all this does not work, we could try to open, one by one:
- On Mac OS X: /dev/pty[p-w][0-9a-f]
- On *BSD: /dev/pty[p-sP-S][0-9a-v]
- On Minix: /dev/pty[p-q][0-9a-f]
- On AIX: /dev/ptyp[0-9a-f]
- On HP-UX: /dev/pty[p-r][0-9a-f]
- On OSF/1: /dev/pty[p-q][0-9a-f]
- On Solaris: /dev/pty[p-r][0-9a-f]
*/
#endif
return master;
}
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