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