80 lines
3.3 KiB
C
80 lines
3.3 KiB
C
/*
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* Copyright (c) 2003, 2008
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* The President and Fellows of Harvard College.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _KERN_WAIT_H_
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#define _KERN_WAIT_H_
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/*
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* Definitions for wait().
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*/
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/* Flags for waitpid() and equivalent. */
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#define WNOHANG 1 /* Nonblocking. */
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#define WUNTRACED 2 /* Report stopping as well as exiting processes. */
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/* Special "pids" to wait for. */
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#define WAIT_ANY (-1) /* Any child process. */
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#define WAIT_MYPGRP 0 /* Any process in the same process group. */
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/*
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* Result encoding.
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*
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* The lowest two bits say what happened; the rest encodes up to 30
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* bits of exit code. Note that the traditional Unix encoding, which
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* is different, wastes most of the bits and can only transmit 8 bits
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* of exit code...
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*/
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#define _WWHAT(x) ((x)&3) /* lower two bits say what happened */
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#define _WVAL(x) ((x)>>2) /* the rest is the value */
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#define _MKWVAL(x) ((x)<<2) /* encode a value */
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/* Four things can happen... */
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#define __WEXITED 0 /* Process exited by calling _exit(). */
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#define __WSIGNALED 1 /* Process received a fatal signal. */
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#define __WCORED 2 /* Process dumped core on a fatal signal. */
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#define __WSTOPPED 3 /* Process stopped (and didn't exit). */
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/* Test macros, used by applications. */
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#define WIFEXITED(x) (_WWHAT(x)==__WEXITED)
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#define WIFSIGNALED(x) (_WWHAT(x)==__WSIGNALED || _WWHAT(x)==__WCORED)
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#define WIFSTOPPED(x) (_WWHAT(x)==__WSTOPPED)
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#define WEXITSTATUS(x) (_WVAL(x))
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#define WTERMSIG(x) (_WVAL(x))
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#define WSTOPSIG(x) (_WVAL(x))
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#define WCOREDUMP(x) (_WWHAT(x)==__WCORED)
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/* Encoding macros, used by the kernel to generate the wait result. */
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#define _MKWAIT_EXIT(x) (_MKWVAL(x)|__WEXITED)
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#define _MKWAIT_SIG(x) (_MKWVAL(x)|__WSIGNALED)
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#define _MKWAIT_CORE(x) (_MKWVAL(x)|__WCORED)
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#define _MKWAIT_STOP(x) (_MKWVAL(x)|__WSTOPPED)
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#endif /* _KERN_WAIT_H_ */
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