Blame bits/waitflags.h

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/* Definitions of flag bits for `waitpid' et al.
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   Copyright (C) 1992-2018 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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#if !defined _SYS_WAIT_H && !defined _STDLIB_H
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# error "Never include <bits/waitflags.h> directly; use <sys/wait.h> instead."
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#endif
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/* Bits in the third argument to `waitpid'.  */
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#define	WNOHANG		1	/* Don't block waiting.  */
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#define	WUNTRACED	2	/* Report status of stopped children.  */