1 /* Copyright (C) 1991, 1992 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>
31 #include <gnu/types.h>
33 /* This will define the `W*' macros for the flag
34 bits to `waitpid', `wait3', and `wait4'. */
35 #include <waitflags.h>
39 /* Lots of hair to allow traditional BSD use of `union wait'
40 as well as POSIX.1 use of `int' for the status word. */
43 #define __WAIT_INT(status) \
44 (__extension__ ({ union { __typeof(status) __in; int __i; } __u; \
45 __u.__in = (status); __u.__i; }))
47 #define __WAIT_INT(status) (*(int *) &(status))
50 /* This is the type of the argument to `wait'. With GCC 2.6.1 and later,
51 the funky union causes redeclarations with either `int *' or `union wait
52 *' to be allowed without complaint. __WAIT_STATUS_DEFN is the type used
53 in the actual function definitions. */
55 /* g++ in gcc 2.6.1 doesn't work. Maybe 2.7.x. H.J. */
56 #if !defined (__GNUC__) || defined (__cplusplus) || \
57 __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6) || \
58 (defined(_MIT_POSIX_THREADS) && _MIT_POSIX_THREADS > 0)
59 #define __WAIT_STATUS __ptr_t
60 #define __WAIT_STATUS_DEFN __ptr_t
62 /* This works in GCC 2.6.1 and later. */
67 } __WAIT_STATUS __attribute__ ((transparent_union));
68 #define __WAIT_STATUS_DEFN int *
71 #else /* Don't use BSD. */
73 #define __WAIT_INT(status) (status)
74 #define __WAIT_STATUS int *
78 /* This will define all the `__W*' macros. */
79 #include <waitstatus.h>
81 #define WEXITSTATUS(status) __WEXITSTATUS(__WAIT_INT(status))
82 #define WTERMSIG(status) __WTERMSIG(__WAIT_INT(status))
83 #define WSTOPSIG(status) __WSTOPSIG(__WAIT_INT(status))
84 #define WIFEXITED(status) __WIFEXITED(__WAIT_INT(status))
85 #define WIFSIGNALED(status) __WIFSIGNALED(__WAIT_INT(status))
86 #define WIFSTOPPED(status) __WIFSTOPPED(__WAIT_INT(status))
89 #define WCOREDUMP(status) __WCOREDUMP(__WAIT_INT(status))
90 #define W_EXITCODE(ret, sig) __W_EXITCODE(ret, sig)
91 #define W_STOPCODE(sig) __W_STOPCODE(sig)
95 /* Wait for a child to die. When one does, put its status in *STAT_LOC
96 and return its process ID. For errors, return (pid_t) -1. */
97 extern __pid_t __wait __P ((__WAIT_STATUS __stat_loc));
98 extern __pid_t wait __P ((__WAIT_STATUS __stat_loc));
101 /* Special values for the PID argument to `waitpid' and `wait4'. */
102 #define WAIT_ANY (-1) /* Any process. */
103 #define WAIT_MYPGRP 0 /* Any process in my process group. */
106 /* Wait for a child matching PID to die.
107 If PID is greater than 0, match any process whose process ID is PID.
108 If PID is (pid_t) -1, match any process.
109 If PID is (pid_t) 0, match any process with the
110 same process group as the current process.
111 If PID is less than -1, match any process whose
112 process group is the absolute value of PID.
113 If the WNOHANG bit is set in OPTIONS, and that child
114 is not already dead, return (pid_t) 0. If successful,
115 return PID and store the dead child's status in STAT_LOC.
116 Return (pid_t) -1 for errors. If the WUNTRACED bit is
117 set in OPTIONS, return status for stopped children; otherwise don't. */
118 extern __pid_t __waitpid __P ((__pid_t __pid, int *__stat_loc,
120 extern __pid_t waitpid __P ((__pid_t __pid, int *__stat_loc,
123 /* This being here makes the prototypes valid whether or not
124 we have already included <sys/resource.h> to define `struct rusage'. */
127 /* Wait for a child to exit. When one does, put its status in *STAT_LOC and
128 return its process ID. For errors return (pid_t) -1. If USAGE is not
129 nil, store information about the child's resource usage there. If the
130 WUNTRACED bit is set in OPTIONS, return status for stopped children;
132 extern __pid_t __wait3 __P ((__WAIT_STATUS __stat_loc,
133 int __options, struct rusage * __usage));
134 extern __pid_t wait3 __P ((__WAIT_STATUS __stat_loc,
135 int __options, struct rusage * __usage));
137 /* PID is like waitpid. Other args are like wait3. */
138 extern __pid_t __wait4 __P ((__pid_t __pid, __WAIT_STATUS __stat_loc,
139 int __options, struct rusage *__usage));
140 extern __pid_t wait4 __P ((__pid_t __pid, __WAIT_STATUS __stat_loc,
141 int __options, struct rusage *__usage));
142 #endif /* Use BSD. */
147 #endif /* sys/wait.h */