summaryrefslogtreecommitdiff
path: root/posix/sys/wait.h
blob: dd6183cc92c3122799e74519052fa1adcef52d61 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/* Copyright (C) 1991, 92, 93, 94, 96 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

/*
 *	POSIX Standard: 3.2.1 Wait for Process Termination	<sys/wait.h>
 */

#ifndef	_SYS_WAIT_H

#define	_SYS_WAIT_H	1
#include <features.h>

__BEGIN_DECLS

#include <gnu/types.h>

/* This will define the `W*' macros for the flag
   bits to `waitpid', `wait3', and `wait4'.  */
#include <waitflags.h>

#ifdef	__USE_BSD

/* Lots of hair to allow traditional BSD use of `union wait'
   as well as POSIX.1 use of `int' for the status word.  */

#ifdef	__GNUC__
#define	__WAIT_INT(status)						      \
  (__extension__ ({ union { __typeof(status) __in; int __i; } __u;	      \
		    __u.__in = (status); __u.__i; }))
#else
#define	__WAIT_INT(status)	(*(int *) &(status))
#endif

/* This is the type of the argument to `wait'.

   NOTE: Since this functionality is volatile, I'm disabling the use of it for
   now.

With GCC 2.6.1 and later, the funky union causes redeclarations with either
   `int *' or `union wait *' to be allowed without complaint.
   __WAIT_STATUS_DEFN is the type used in the actual function
   definitions. */

#if	(!defined (__GNUC__) || __GNUC__ < 2 || \
	 /*(__GNUC__ == 2 && __GNUC_MINOR__ < 6)*/ 1)
#define	__WAIT_STATUS		__ptr_t
#define	__WAIT_STATUS_DEFN	__ptr_t
#else
/* This works in GCC 2.6.1 and later.  */
typedef union
  {
    union wait *__uptr;
    int *__iptr;
  } __WAIT_STATUS __attribute__ ((transparent_union));
#define	__WAIT_STATUS_DEFN	int *
#endif

#else /* Don't use BSD.  */

#define	__WAIT_INT(status)	(status)
#define	__WAIT_STATUS		int *
#define	__WAIT_STATUS_DEFN	int *

#endif /* Use BSD.  */

/* This will define all the `__W*' macros.  */
#include <waitstatus.h>

#define	WEXITSTATUS(status)	__WEXITSTATUS(__WAIT_INT(status))
#define	WTERMSIG(status)	__WTERMSIG(__WAIT_INT(status))
#define	WSTOPSIG(status)	__WSTOPSIG(__WAIT_INT(status))
#define	WIFEXITED(status)	__WIFEXITED(__WAIT_INT(status))
#define	WIFSIGNALED(status)	__WIFSIGNALED(__WAIT_INT(status))
#define	WIFSTOPPED(status)	__WIFSTOPPED(__WAIT_INT(status))

#ifdef	__USE_BSD
#define	WCOREFLAG		__WCOREFLAG
#define	WCOREDUMP(status)	__WCOREDUMP(__WAIT_INT(status))
#define	W_EXITCODE(ret, sig)	__W_EXITCODE(ret, sig)
#define	W_STOPCODE(sig)		__W_STOPCODE(sig)
#endif


/* Wait for a child to die.  When one does, put its status in *STAT_LOC
   and return its process ID.  For errors, return (pid_t) -1.  */
extern __pid_t __wait __P ((__WAIT_STATUS __stat_loc));
extern __pid_t wait __P ((__WAIT_STATUS __stat_loc));

#ifdef	__USE_BSD
/* Special values for the PID argument to `waitpid' and `wait4'.  */
#define	WAIT_ANY	(-1)	/* Any process.  */
#define	WAIT_MYPGRP	0	/* Any process in my process group.  */
#endif

/* Wait for a child matching PID to die.
   If PID is greater than 0, match any process whose process ID is PID.
   If PID is (pid_t) -1, match any process.
   If PID is (pid_t) 0, match any process with the
   same process group as the current process.
   If PID is less than -1, match any process whose
   process group is the absolute value of PID.
   If the WNOHANG bit is set in OPTIONS, and that child
   is not already dead, return (pid_t) 0.  If successful,
   return PID and store the dead child's status in STAT_LOC.
   Return (pid_t) -1 for errors.  If the WUNTRACED bit is
   set in OPTIONS, return status for stopped children; otherwise don't.  */
extern __pid_t __waitpid __P ((__pid_t __pid, int *__stat_loc,
			       int __options));
extern __pid_t waitpid __P ((__pid_t __pid, int *__stat_loc,
			     int __options));
#ifdef	__USE_BSD
/* This being here makes the prototypes valid whether or not
   we have already included <sys/resource.h> to define `struct rusage'.  */
struct rusage;

/* Wait for a child to exit.  When one does, put its status in *STAT_LOC and
   return its process ID.  For errors return (pid_t) -1.  If USAGE is not
   nil, store information about the child's resource usage there.  If the
   WUNTRACED bit is set in OPTIONS, return status for stopped children;
   otherwise don't.  */
extern __pid_t __wait3 __P ((__WAIT_STATUS __stat_loc,
			     int __options, struct rusage * __usage));
extern __pid_t wait3 __P ((__WAIT_STATUS __stat_loc,
			   int __options, struct rusage * __usage));

/* PID is like waitpid.  Other args are like wait3.  */
extern __pid_t __wait4 __P ((__pid_t __pid, __WAIT_STATUS __stat_loc,
			     int __options, struct rusage *__usage));
extern __pid_t wait4 __P ((__pid_t __pid, __WAIT_STATUS __stat_loc,
			   int __options, struct rusage *__usage));
#endif /* Use BSD.  */


__END_DECLS

#endif /* sys/wait.h  */