1/* Definitions of status bits for `wait' et al.
2   Copyright (C) 1992, 1994, 1996, 1997, 2000 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#ifdef	__GNUC__
42# define __WIFSIGNALED(status) \
43  (__extension__ ({ int __status = (status);				      \
44		    !__WIFSTOPPED(__status) && !__WIFEXITED(__status); }))
45#else	/* Not GCC.  */
46# define __WIFSIGNALED(status)	(!__WIFSTOPPED(status) && !__WIFEXITED(status))
47#endif	/* GCC.  */
48
49/* Nonzero if STATUS indicates the child is stopped.  */
50#define	__WIFSTOPPED(status)	(((status) & 0xff) == 0x7f)
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	__WCOREFLAG		0x80
59
60
61#ifdef	__USE_BSD
62
63# include <endian.h>
64
65union wait
66  {
67    int w_status;
68    struct
69      {
70# if	__BYTE_ORDER == __LITTLE_ENDIAN
71	unsigned int __w_termsig:7; /* Terminating signal.  */
72	unsigned int __w_coredump:1; /* Set if dumped core.  */
73	unsigned int __w_retcode:8; /* Return code if exited normally.  */
74	unsigned int:16;
75# endif				/* Little endian.  */
76# if	__BYTE_ORDER == __BIG_ENDIAN
77	unsigned int:16;
78	unsigned int __w_retcode:8;
79	unsigned int __w_coredump:1;
80	unsigned int __w_termsig:7;
81# endif				/* Big endian.  */
82      } __wait_terminated;
83    struct
84      {
85# if	__BYTE_ORDER == __LITTLE_ENDIAN
86	unsigned int __w_stopval:8; /* W_STOPPED if stopped.  */
87	unsigned int __w_stopsig:8; /* Stopping signal.  */
88	unsigned int:16;
89# endif				/* Little endian.  */
90# if	__BYTE_ORDER == __BIG_ENDIAN
91	unsigned int:16;
92	unsigned int __w_stopsig:8; /* Stopping signal.  */
93	unsigned int __w_stopval:8; /* W_STOPPED if stopped.  */
94# endif				/* Big endian.  */
95      } __wait_stopped;
96  };
97
98# define w_termsig	__wait_terminated.__w_termsig
99# define w_coredump	__wait_terminated.__w_coredump
100# define w_retcode	__wait_terminated.__w_retcode
101# define w_stopsig	__wait_stopped.__w_stopsig
102# define w_stopval	__wait_stopped.__w_stopval
103
104#endif	/* Use BSD.  */
105