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1 /* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
20 * POSIX Standard: 3.2.1 Wait for Process Termination <sys/wait.h>
30 #include <gnu/types.h>
32 /* This will define the `W*' macros for the flag
33 bits to `waitpid', `wait3', and `wait4'. */
34 #include <waitflags.h>
38 /* Lots of hair to allow traditional BSD use of `union wait'
39 as well as POSIX.1 use of `int' for the status word. */
42 #define __WAIT_INT(status) \
43 (__extension__ ({ union { __typeof(status) __in; int __i; } __u; \
44 __u.__in = (status); __u.__i; }))
46 #define __WAIT_INT(status) (*(int *) &(status))
49 /* This is the type of the argument to `wait'.
51 NOTE: Since this functionality is volatile, I'm disabling the use of it for
54 With GCC 2.6.1 and later, the funky union causes redeclarations with either
55 `int *' or `union wait *' to be allowed without complaint.
56 __WAIT_STATUS_DEFN is the type used in the actual function
59 #if (!defined (__GNUC__) || __GNUC__ < 2 || \
60 /*(__GNUC__ == 2 && __GNUC_MINOR__ < 6)*/ 1)
61 #define __WAIT_STATUS __ptr_t
62 #define __WAIT_STATUS_DEFN __ptr_t
64 /* This works in GCC 2.6.1 and later. */
69 } __WAIT_STATUS
__attribute__ ((transparent_union
));
70 #define __WAIT_STATUS_DEFN int *
73 #else /* Don't use BSD. */
75 #define __WAIT_INT(status) (status)
76 #define __WAIT_STATUS int *
77 #define __WAIT_STATUS_DEFN int *
81 /* This will define all the `__W*' macros. */
82 #include <waitstatus.h>
84 #define WEXITSTATUS(status) __WEXITSTATUS(__WAIT_INT(status))
85 #define WTERMSIG(status) __WTERMSIG(__WAIT_INT(status))
86 #define WSTOPSIG(status) __WSTOPSIG(__WAIT_INT(status))
87 #define WIFEXITED(status) __WIFEXITED(__WAIT_INT(status))
88 #define WIFSIGNALED(status) __WIFSIGNALED(__WAIT_INT(status))
89 #define WIFSTOPPED(status) __WIFSTOPPED(__WAIT_INT(status))
92 #define WCOREFLAG __WCOREFLAG
93 #define WCOREDUMP(status) __WCOREDUMP(__WAIT_INT(status))
94 #define W_EXITCODE(ret, sig) __W_EXITCODE(ret, sig)
95 #define W_STOPCODE(sig) __W_STOPCODE(sig)
99 /* Wait for a child to die. When one does, put its status in *STAT_LOC
100 and return its process ID. For errors, return (pid_t) -1. */
101 extern __pid_t __wait
__P ((__WAIT_STATUS __stat_loc
));
102 extern __pid_t wait
__P ((__WAIT_STATUS __stat_loc
));
105 /* Special values for the PID argument to `waitpid' and `wait4'. */
106 #define WAIT_ANY (-1) /* Any process. */
107 #define WAIT_MYPGRP 0 /* Any process in my process group. */
110 /* Wait for a child matching PID to die.
111 If PID is greater than 0, match any process whose process ID is PID.
112 If PID is (pid_t) -1, match any process.
113 If PID is (pid_t) 0, match any process with the
114 same process group as the current process.
115 If PID is less than -1, match any process whose
116 process group is the absolute value of PID.
117 If the WNOHANG bit is set in OPTIONS, and that child
118 is not already dead, return (pid_t) 0. If successful,
119 return PID and store the dead child's status in STAT_LOC.
120 Return (pid_t) -1 for errors. If the WUNTRACED bit is
121 set in OPTIONS, return status for stopped children; otherwise don't. */
122 extern __pid_t __waitpid
__P ((__pid_t __pid
, int *__stat_loc
,
124 extern __pid_t waitpid
__P ((__pid_t __pid
, int *__stat_loc
,
127 /* This being here makes the prototypes valid whether or not
128 we have already included <sys/resource.h> to define `struct rusage'. */
131 /* Wait for a child to exit. When one does, put its status in *STAT_LOC and
132 return its process ID. For errors return (pid_t) -1. If USAGE is not
133 nil, store information about the child's resource usage there. If the
134 WUNTRACED bit is set in OPTIONS, return status for stopped children;
136 extern __pid_t __wait3
__P ((__WAIT_STATUS __stat_loc
,
137 int __options
, struct rusage
* __usage
));
138 extern __pid_t wait3
__P ((__WAIT_STATUS __stat_loc
,
139 int __options
, struct rusage
* __usage
));
141 /* PID is like waitpid. Other args are like wait3. */
142 extern __pid_t __wait4
__P ((__pid_t __pid
, __WAIT_STATUS __stat_loc
,
143 int __options
, struct rusage
*__usage
));
144 extern __pid_t wait4
__P ((__pid_t __pid
, __WAIT_STATUS __stat_loc
,
145 int __options
, struct rusage
*__usage
));
146 #endif /* Use BSD. */
151 #endif /* sys/wait.h */
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