1/* Definitions of status bits for `wait' et al.
2   Copyright (C) 1992,1994,1996,1997,2000,2004 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, write to the Free
17   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18   02111-1307 USA.  */
19
20#if !defined _SYS_WAIT_H && !defined _STDLIB_H
21# error "Never include <bits/waitstatus.h> directly; use <sys/wait.h> instead."
22#endif
23
24
25/* Everything extant so far uses these same bits.  */
26
27
28/* If WIFEXITED(STATUS), the low-order 8 bits of the status.  */
29#define	__WEXITSTATUS(status)	(((status) & 0xff00) >> 8)
30
31/* If WIFSIGNALED(STATUS), the terminating signal.  */
32#define	__WTERMSIG(status)	((status) & 0x7f)
33
34/* If WIFSTOPPED(STATUS), the signal that stopped the child.  */
35#define	__WSTOPSIG(status)	__WEXITSTATUS(status)
36
37/* Nonzero if STATUS indicates normal termination.  */
38#define	__WIFEXITED(status)	(__WTERMSIG(status) == 0)
39
40/* Nonzero if STATUS indicates termination by a signal.  */
41#define __WIFSIGNALED(status) \
42  (((signed char) (((status) & 0x7f) + 1) >> 1) > 0)
43
44/* Nonzero if STATUS indicates the child is stopped.  */
45#define	__WIFSTOPPED(status)	(((status) & 0xff) == 0x7f)
46
47/* Nonzero if STATUS indicates the child continued after a stop.  We only
48   define this if <bits/waitflags.h> provides the WCONTINUED flag bit.  */
49#ifdef WCONTINUED
50# define __WIFCONTINUED(status)	((status) == __W_CONTINUED)
51#endif
52
53/* Nonzero if STATUS indicates the child dumped core.  */
54#define	__WCOREDUMP(status)	((status) & __WCOREFLAG)
55
56/* Macros for constructing status values.  */
57#define	__W_EXITCODE(ret, sig)	((ret) << 8 | (sig))
58#define	__W_STOPCODE(sig)	((sig) << 8 | 0x7f)
59#define __W_CONTINUED		0xffff
60#define	__WCOREFLAG		0x80
61
62
63#ifdef	__USE_BSD
64
65# include <endian.h>
66
67union wait
68  {
69    int w_status;
70    struct
71      {
72# if	__BYTE_ORDER == __LITTLE_ENDIAN
73	unsigned int __w_termsig:7; /* Terminating signal.  */
74	unsigned int __w_coredump:1; /* Set if dumped core.  */
75	unsigned int __w_retcode:8; /* Return code if exited normally.  */
76	unsigned int:16;
77# endif				/* Little endian.  */
78# if	__BYTE_ORDER == __BIG_ENDIAN
79	unsigned int:16;
80	unsigned int __w_retcode:8;
81	unsigned int __w_coredump:1;
82	unsigned int __w_termsig:7;
83# endif				/* Big endian.  */
84      } __wait_terminated;
85    struct
86      {
87# if	__BYTE_ORDER == __LITTLE_ENDIAN
88	unsigned int __w_stopval:8; /* W_STOPPED if stopped.  */
89	unsigned int __w_stopsig:8; /* Stopping signal.  */
90	unsigned int:16;
91# endif				/* Little endian.  */
92# if	__BYTE_ORDER == __BIG_ENDIAN
93	unsigned int:16;
94	unsigned int __w_stopsig:8; /* Stopping signal.  */
95	unsigned int __w_stopval:8; /* W_STOPPED if stopped.  */
96# endif				/* Big endian.  */
97      } __wait_stopped;
98  };
99
100# define w_termsig	__wait_terminated.__w_termsig
101# define w_coredump	__wait_terminated.__w_coredump
102# define w_retcode	__wait_terminated.__w_retcode
103# define w_stopsig	__wait_stopped.__w_stopsig
104# define w_stopval	__wait_stopped.__w_stopval
105
106#endif	/* Use BSD.  */
107