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58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
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/* Copyright (C) 1993, 1994, 1995 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
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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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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DEFUN(__setpgid, (pid, pgid), pid_t pid AND 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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weak_alias (__setpgid, setpgid)
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weak_alias (__setpgid, setpgrp)
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