| /* Open the master side of a pseudo-terminal. |
| Copyright (C) 2010-2020 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 <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; |
| } |