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/* Copyright (C) 1993,94,95,97,99 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. 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 <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)
/* Punt our current ctty. We hold the dtable lock from before the
proc_setsid call through clearing the cttyid port so that we can be
sure that it's been cleared by the time the signal thread attempts
to re-ctty the dtable in response to the pgrp change notification. */
_hurd_port_set (&_hurd_ports[INIT_PORT_CTTYID], MACH_PORT_NULL);
__mutex_unlock (&_hurd_dtable_lock);
if (!err)
/* Synchronize with the signal thread to make sure we have
received and processed proc_newids before returning to the user.
This both updates _hurd_pgrp, and
*/
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)
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