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* sysdeps/mach/hurd/wait4.c (__wait4): When proc_wait returns EAGAIN, return zero to indicate no children died yet (assuming WNOHANG). * sysdeps/mach/hurd/setsid.c: #include <hurd/fd.h>. 1999-09-17 Roland McGrath <roland@baalperazim.frob.com> * hurd/port2fd.c (_hurd_port2fd): Never change CTTYID port. * sysdeps/mach/hurd/setsid.c (__setsid): Fix return type -> pid_t. Return _hurd_pgrp instead of 0.
71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
/* Copyright (C) 1993,94,95,97,99 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <unistd.h>
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#include <hurd.h>
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#include <hurd/port.h>
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#include <hurd/fd.h>
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/* Create a new session with the calling process as its leader.
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The process group IDs of the session and the calling process
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are set to the process ID of the calling process, which is returned. */
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pid_t
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__setsid (void)
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{
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error_t err;
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unsigned int stamp;
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HURD_CRITICAL_BEGIN;
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__mutex_lock (&_hurd_dtable_lock);
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stamp = _hurd_pids_changed_stamp; /* Atomic fetch. */
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/* Tell the proc server we want to start a new session. */
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err = __USEPORT (PROC, __proc_setsid (port));
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if (!err)
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/* Punt our current ctty. We hold the dtable lock from before the
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proc_setsid call through clearing the cttyid port so that we can be
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sure that it's been cleared by the time the signal thread attempts
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to re-ctty the dtable in response to the pgrp change notification. */
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_hurd_port_set (&_hurd_ports[INIT_PORT_CTTYID], MACH_PORT_NULL);
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__mutex_unlock (&_hurd_dtable_lock);
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if (!err)
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/* Synchronize with the signal thread to make sure we have
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received and processed proc_newids before returning to the user.
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This both updates _hurd_pgrp, and
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*/
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while (_hurd_pids_changed_stamp == stamp)
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{
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#ifdef noteven
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/* XXX we have no need for a mutex, but cthreads demands one. */
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__condition_wait (&_hurd_pids_changed_sync, NULL);
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#else
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__swtch_pri (0);
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#endif
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}
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HURD_CRITICAL_END;
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return err ? __hurd_fail (err) : _hurd_pgrp;
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}
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weak_alias (__setsid, setsid)
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