1 /* Definitions of status bits for `wait' et al.
2 Copyright (C) 1992-2015 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19 #if !defined _SYS_WAIT_H && !defined _STDLIB_H
20 # error "Never include <bits/waitstatus.h> directly; use <sys/wait.h> instead."
21 #endif
22
23
24 /* Everything extant so far uses these same bits. */
25
26
27 /* If WIFEXITED(STATUS), the low-order 8 bits of the status. */
28 #define __WEXITSTATUS(status) (((status) & 0xff00) >> 8)
29
30 /* If WIFSIGNALED(STATUS), the terminating signal. */
31 #define __WTERMSIG(status) ((status) & 0x7f)
32
33 /* If WIFSTOPPED(STATUS), the signal that stopped the child. */
34 #define __WSTOPSIG(status) __WEXITSTATUS(status)
35
36 /* Nonzero if STATUS indicates normal termination. */
37 #define __WIFEXITED(status) (__WTERMSIG(status) == 0)
38
39 /* Nonzero if STATUS indicates termination by a signal. */
40 #define __WIFSIGNALED(status) \
41 (((signed char) (((status) & 0x7f) + 1) >> 1) > 0)
42
43 /* Nonzero if STATUS indicates the child is stopped. */
44 #define __WIFSTOPPED(status) (((status) & 0xff) == 0x7f)
45
46 /* Nonzero if STATUS indicates the child continued after a stop. We only
47 define this if <bits/waitflags.h> provides the WCONTINUED flag bit. */
48 #ifdef WCONTINUED
49 # define __WIFCONTINUED(status) ((status) == __W_CONTINUED)
50 #endif
51
52 /* Nonzero if STATUS indicates the child dumped core. */
53 #define __WCOREDUMP(status) ((status) & __WCOREFLAG)
54
55 /* Macros for constructing status values. */
56 #define __W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
57 #define __W_STOPCODE(sig) ((sig) << 8 | 0x7f)
58 #define __W_CONTINUED 0xffff
59 #define __WCOREFLAG 0x80
60
61
62 #ifdef __USE_MISC
63
64 # include <endian.h>
65
66 union wait
67 {
68 int w_status;
69 struct
70 {
71 # if __BYTE_ORDER == __LITTLE_ENDIAN
72 unsigned int __w_termsig:7; /* Terminating signal. */
73 unsigned int __w_coredump:1; /* Set if dumped core. */
74 unsigned int __w_retcode:8; /* Return code if exited normally. */
75 unsigned int:16;
76 # endif /* Little endian. */
77 # if __BYTE_ORDER == __BIG_ENDIAN
78 unsigned int:16;
79 unsigned int __w_retcode:8;
80 unsigned int __w_coredump:1;
81 unsigned int __w_termsig:7;
82 # endif /* Big endian. */
83 } __wait_terminated;
84 struct
85 {
86 # if __BYTE_ORDER == __LITTLE_ENDIAN
87 unsigned int __w_stopval:8; /* W_STOPPED if stopped. */
88 unsigned int __w_stopsig:8; /* Stopping signal. */
89 unsigned int:16;
90 # endif /* Little endian. */
91 # if __BYTE_ORDER == __BIG_ENDIAN
92 unsigned int:16;
93 unsigned int __w_stopsig:8; /* Stopping signal. */
94 unsigned int __w_stopval:8; /* W_STOPPED if stopped. */
95 # endif /* Big endian. */
96 } __wait_stopped;
97 };
98
99 # define w_termsig __wait_terminated.__w_termsig
100 # define w_coredump __wait_terminated.__w_coredump
101 # define w_retcode __wait_terminated.__w_retcode
102 # define w_stopsig __wait_stopped.__w_stopsig
103 # define w_stopval __wait_stopped.__w_stopval
104
105 #endif /* Use misc. */
106