1/* Definitions of status bits for `wait' et al.
2 Copyright (C) 1992-2022 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 <https://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