1/* Definitions of status bits for `wait' et al. 
2 Copyright (C) 1992-2020 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