72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
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/* Copyright (C) 1993-2022 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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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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#include <hurd/ioctl.h>
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#include <lowlevellock.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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retry:
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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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__mutex_unlock (&_hurd_dtable_lock);
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else
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{
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/* Punt our current ctty, and update the dtable accordingly. We hold
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the dtable lock from before the proc_setsid call through clearing
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the cttyid port and processing the dtable, so that we can be sure
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that it's all done by the time the signal thread processes the
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pgrp change notification. */
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_hurd_locked_install_cttyid (MACH_PORT_NULL);
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/* Synchronize with the signal thread to make sure we have received
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and processed proc_newids before returning to the user.
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This is necessary to ensure that _hurd_pgrp (and thus the value
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returned by `getpgrp ()' in other threads) has been updated before
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we return. */
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while (_hurd_pids_changed_stamp == stamp)
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lll_wait (_hurd_pids_changed_stamp, stamp, 0);
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}
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HURD_CRITICAL_END;
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if (err == EINTR)
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/* Got a signal while inside an RPC of the critical section, retry again */
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goto retry;
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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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