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55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/* Copyright (C) 1993-2017 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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<http://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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/* Set the process group ID of the process matching PID to PGID.
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If PID is zero, the current process's process group ID is set.
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If PGID is zero, the process ID of the process is used. */
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int
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__setpgid (pid_t pid, pid_t pgid)
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{
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error_t err;
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unsigned int stamp;
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stamp = _hurd_pids_changed_stamp; /* Atomic fetch. */
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if (err = __USEPORT (PROC, __proc_setpgrp (port, pid, pgid)))
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return __hurd_fail (err);
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if (pid == 0 || pid == _hurd_pid)
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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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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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return 0;
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}
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libc_hidden_def (__setpgid)
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weak_alias (__setpgid, setpgid)
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