| /* Copyright (C) 1991, 1995, 1996, 1997 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library 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. |
| |
| The GNU C Library 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 the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <errno.h> |
| #include <unistd.h> |
| #include <sys/ioctl.h> |
| #include <sys/types.h> |
| #include <fcntl.h> |
| |
| /* Create a new session with the calling process as its leader. |
| The process group IDs of the session and the calling process |
| are set to the process ID of the calling process, which is returned. */ |
| int |
| __setsid () |
| { |
| pid_t pid = getpid (); |
| int tty; |
| int save = errno; |
| |
| if (__getpgid (pid) == pid) |
| { |
| /* Already the leader. */ |
| __set_errno (EPERM); |
| return -1; |
| } |
| |
| if (setpgid (pid, pid) < 0) |
| return -1; |
| |
| tty = open ("/dev/tty", 0); |
| if (tty < 0) |
| { |
| __set_errno (save); |
| return 0; |
| } |
| (void) __ioctl (tty, TIOCNOTTY, 0); |
| (void) __close (tty); |
| |
| __set_errno (save); |
| return 0; |
| } |
| |
| weak_alias (__setsid, setsid) |