| /* Copyright (C) 1993-2014 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <unistd.h> |
| #include <hurd.h> |
| #include <hurd/port.h> |
| #include <hurd/fd.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. */ |
| pid_t |
| __setsid (void) |
| { |
| error_t err; |
| unsigned int stamp; |
| |
| HURD_CRITICAL_BEGIN; |
| __mutex_lock (&_hurd_dtable_lock); |
| |
| stamp = _hurd_pids_changed_stamp; /* Atomic fetch. */ |
| |
| /* Tell the proc server we want to start a new session. */ |
| err = __USEPORT (PROC, __proc_setsid (port)); |
| if (err) |
| __mutex_unlock (&_hurd_dtable_lock); |
| else |
| { |
| /* Punt our current ctty, and update the dtable accordingly. We hold |
| the dtable lock from before the proc_setsid call through clearing |
| the cttyid port and processing the dtable, so that we can be sure |
| that it's all done by the time the signal thread processes the |
| pgrp change notification. */ |
| _hurd_locked_install_cttyid (MACH_PORT_NULL); |
| |
| /* Synchronize with the signal thread to make sure we have received |
| and processed proc_newids before returning to the user. |
| This is necessary to ensure that _hurd_pgrp (and thus the value |
| returned by `getpgrp ()' in other threads) has been updated before |
| we return. */ |
| while (_hurd_pids_changed_stamp == stamp) |
| { |
| #ifdef noteven |
| /* XXX we have no need for a mutex, but cthreads demands one. */ |
| __condition_wait (&_hurd_pids_changed_sync, NULL); |
| #else |
| __swtch_pri (0); |
| #endif |
| } |
| } |
| |
| HURD_CRITICAL_END; |
| |
| return err ? __hurd_fail (err) : _hurd_pgrp; |
| } |
| |
| weak_alias (__setsid, setsid) |