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1 /*
2 * Copyright (c) 2003, 2008
3 * The President and Fellows of Harvard College.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifndef _KERN_WAIT_H_
31 #define _KERN_WAIT_H_
32
33 /*
34 * Definitions for wait().
35 */
36
37
38 /* Flags for waitpid() and equivalent. */
39 #define WNOHANG 1 /* Nonblocking. */
40 #define WUNTRACED 2 /* Report stopping as well as exiting processes. */
41
42 /* Special "pids" to wait for. */
43 #define WAIT_ANY (-1) /* Any child process. */
44 #define WAIT_MYPGRP 0 /* Any process in the same process group. */
45
46 /*
47 * Result encoding.
48 *
49 * The lowest two bits say what happened; the rest encodes up to 30
50 * bits of exit code. Note that the traditional Unix encoding, which
51 * is different, wastes most of the bits and can only transmit 8 bits
52 * of exit code...
53 */
54 #define _WWHAT(x) ((x)&3) /* lower two bits say what happened */
55 #define _WVAL(x) ((x)>>2) /* the rest is the value */
56 #define _MKWVAL(x) ((x)<<2) /* encode a value */
57
58 /* Four things can happen... */
59 #define __WEXITED 0 /* Process exited by calling _exit(). */
60 #define __WSIGNALED 1 /* Process received a fatal signal. */
61 #define __WCORED 2 /* Process dumped core on a fatal signal. */
62 #define __WSTOPPED 3 /* Process stopped (and didn't exit). */
63
64 /* Test macros, used by applications. */
65 #define WIFEXITED(x) (_WWHAT(x)==__WEXITED)
66 #define WIFSIGNALED(x) (_WWHAT(x)==__WSIGNALED || _WWHAT(x)==__WCORED)
67 #define WIFSTOPPED(x) (_WWHAT(x)==__WSTOPPED)
68 #define WEXITSTATUS(x) (_WVAL(x))
69 #define WTERMSIG(x) (_WVAL(x))
70 #define WSTOPSIG(x) (_WVAL(x))
71 #define WCOREDUMP(x) (_WWHAT(x)==__WCORED)
72
73 /* Encoding macros, used by the kernel to generate the wait result. */
74 #define _MKWAIT_EXIT(x) (_MKWVAL(x)|__WEXITED)
75 #define _MKWAIT_SIG(x) (_MKWVAL(x)|__WSIGNALED)
76 #define _MKWAIT_CORE(x) (_MKWVAL(x)|__WCORED)
77 #define _MKWAIT_STOP(x) (_MKWVAL(x)|__WSTOPPED)
78
79 #endif /* _KERN_WAIT_H_ */