| /* Determine the session ID of the controlling terminal of the current process. |
| 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 2, 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> |
| |
| #define USE_OLD_TTY /* needed on OpenBSD 4.5, so that TIOCGSID gets defined */ |
| |
| /* Specification. */ |
| #include <termios.h> |
| |
| #include <errno.h> |
| #include <sys/ioctl.h> |
| |
| pid_t |
| tcgetsid (int fd) |
| { |
| #ifdef TIOCGSID /* Mac OS X, OpenBSD */ |
| int sid; |
| |
| if (ioctl (fd, TIOCGSID, &sid) < 0) |
| return -1; /* errno is set here */ |
| |
| return sid; |
| #else /* FreeBSD, Cygwin, mingw */ |
| errno = ENOSYS; |
| return -1; |
| #endif |
| } |