1 /* Copyright (C) 1993,94,95,97,99 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
22 #include <hurd/port.h>
25 /* Create a new session with the calling process as its leader.
26 The process group IDs of the session and the calling process
27 are set to the process ID of the calling process, which is returned. */
35 __mutex_lock (&_hurd_dtable_lock
);
37 stamp
= _hurd_pids_changed_stamp
; /* Atomic fetch. */
39 /* Tell the proc server we want to start a new session. */
40 err
= __USEPORT (PROC
, __proc_setsid (port
));
42 __mutex_unlock (&_hurd_dtable_lock
);
45 /* Punt our current ctty, and update the dtable accordingly. We hold
46 the dtable lock from before the proc_setsid call through clearing
47 the cttyid port and processing the dtable, so that we can be sure
48 that it's all done by the time the signal thread processes the
49 pgrp change notification. */
50 _hurd_locked_install_cttyid (MACH_PORT_NULL
);
52 /* Synchronize with the signal thread to make sure we have received
53 and processed proc_newids before returning to the user.
54 This is necessary to ensure that _hurd_pgrp (and thus the value
55 returned by `getpgrp ()' in other threads) has been updated before
57 while (_hurd_pids_changed_stamp
== stamp
)
60 /* XXX we have no need for a mutex, but cthreads demands one. */
61 __condition_wait (&_hurd_pids_changed_sync
, NULL
);
70 return err
? __hurd_fail (err
) : _hurd_pgrp
;
73 weak_alias (__setsid
, setsid
)