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54 lines
1.8 KiB
C
54 lines
1.8 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 <sys/types.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <hurd.h>
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#include <hurd/port.h>
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pid_t
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__wait4 (pid_t pid, int *stat_loc, int options, struct rusage *usage)
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{
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pid_t dead;
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error_t err;
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struct rusage ignored;
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int sigcode;
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int dummy;
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err = __USEPORT (PROC, __proc_wait (port, pid, options,
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stat_loc ?: &dummy, &sigcode,
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usage ?: &ignored, &dead));
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switch (err)
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{
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case 0: /* Got a child. */
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return dead;
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case EAGAIN:
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/* The RPC returns this error when the WNOHANG flag is set and no
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selected children are dead (but some are living). In that
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situation, our return value is zero. (The RPC can't return zero
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for DEAD without also returning some garbage for the other out
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parameters, so an error return is much more natural here. Hence
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the difference between the RPC and the POSIX.1 interface. */
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return (pid_t) 0;
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default:
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return (pid_t) __hurd_fail (err);
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}
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}
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weak_alias (__wait4, wait4)
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