1 /* Copyright (C) 1991-1994,1996-2001,2003,2004,2005,2007,2009 2 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, see 17 <http://www.gnu.org/licenses/>. */ 18 19 /* 20 * POSIX Standard: 3.2.1 Wait for Process Termination <sys/wait.h> 21 */ 22 23 #ifndef _SYS_WAIT_H 24 #define _SYS_WAIT_H 1 25 26 #include <features.h> 27 28 __BEGIN_DECLS 29 30 #include <signal.h> 31 #include <sys/resource.h> 32 33 /* These macros could also be defined in <stdlib.h>. */ 34 #if !defined _STDLIB_H || !defined __USE_XOPEN 35 /* This will define the `W*' macros for the flag 36 bits to `waitpid', `wait3', and `wait4'. */ 37 # include <bits/waitflags.h> 38 39 # ifdef __USE_BSD 40 41 /* Lots of hair to allow traditional BSD use of `union wait' 42 as well as POSIX.1 use of `int' for the status word. */ 43 44 # if defined __GNUC__ && !defined __cplusplus 45 # define __WAIT_INT(status) \ 46 (__extension__ (((union { __typeof(status) __in; int __i; }) \ 47 { .__in = (status) }).__i)) 48 # else 49 # define __WAIT_INT(status) (*(const int *) &(status)) 50 # endif 51 52 /* This is the type of the argument to `wait'. The funky union 53 causes redeclarations with either `int *' or `union wait *' to be 54 allowed without complaint. __WAIT_STATUS_DEFN is the type used in 55 the actual function definitions. */ 56 57 # if !defined __GNUC__ || __GNUC__ < 2 || defined __cplusplus 58 # define __WAIT_STATUS void * 59 # define __WAIT_STATUS_DEFN void * 60 # else 61 /* This works in GCC 2.6.1 and later. */ 62 typedef union 63 { 64 union wait *__uptr; 65 int *__iptr; 66 } __WAIT_STATUS __attribute__ ((__transparent_union__)); 67 # define __WAIT_STATUS_DEFN int * 68 # endif 69 70 # else /* Don't use BSD. */ 71 72 # define __WAIT_INT(status) (status) 73 # define __WAIT_STATUS int * 74 # define __WAIT_STATUS_DEFN int * 75 76 # endif /* Use BSD. */ 77 78 /* This will define all the `__W*' macros. */ 79 # include <bits/waitstatus.h> 80 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)) 87 # ifdef __WIFCONTINUED 88 # define WIFCONTINUED(status) __WIFCONTINUED (__WAIT_INT (status)) 89 # endif 90 #endif /* <stdlib.h> not included. */ 91 92 #ifdef __USE_BSD 93 # define WCOREFLAG __WCOREFLAG 94 # define WCOREDUMP(status) __WCOREDUMP (__WAIT_INT (status)) 95 # define W_EXITCODE(ret, sig) __W_EXITCODE (ret, sig) 96 # define W_STOPCODE(sig) __W_STOPCODE (sig) 97 #endif 98 99 /* The following values are used by the `waitid' function. */ 100 #if defined __USE_SVID || defined __USE_XOPEN 101 typedef enum 102 { 103 P_ALL, /* Wait for any child. */ 104 P_PID, /* Wait for specified process. */ 105 P_PGID /* Wait for members of process group. */ 106 } idtype_t; 107 #endif 108 109 110 /* Wait for a child to die. When one does, put its status in *STAT_LOC 111 and return its process ID. For errors, return (pid_t) -1. 112 113 This function is a cancellation point and therefore not marked with 114 __THROW. */ 115 extern __pid_t wait (__WAIT_STATUS __stat_loc); 116 117 #ifdef __USE_BSD 118 /* Special values for the PID argument to `waitpid' and `wait4'. */ 119 # define WAIT_ANY (-1) /* Any process. */ 120 # define WAIT_MYPGRP 0 /* Any process in my process group. */ 121 #endif 122 123 /* Wait for a child matching PID to die. 124 If PID is greater than 0, match any process whose process ID is PID. 125 If PID is (pid_t) -1, match any process. 126 If PID is (pid_t) 0, match any process with the 127 same process group as the current process. 128 If PID is less than -1, match any process whose 129 process group is the absolute value of PID. 130 If the WNOHANG bit is set in OPTIONS, and that child 131 is not already dead, return (pid_t) 0. If successful, 132 return PID and store the dead child's status in STAT_LOC. 133 Return (pid_t) -1 for errors. If the WUNTRACED bit is 134 set in OPTIONS, return status for stopped children; otherwise don't. 135 136 This function is a cancellation point and therefore not marked with 137 __THROW. */ 138 extern __pid_t waitpid (__pid_t __pid, int *__stat_loc, int __options); 139 #ifdef _LIBC 140 extern __typeof(waitpid) __waitpid_nocancel attribute_hidden; 141 libc_hidden_proto(waitpid) 142 #endif 143 144 #if defined __USE_SVID || defined __USE_XOPEN 145 # define __need_siginfo_t 146 # include <bits/siginfo.h> 147 /* Wait for a childing matching IDTYPE and ID to change the status and 148 place appropriate information in *INFOP. 149 If IDTYPE is P_PID, match any process whose process ID is ID. 150 If IDTYPE is P_PGID, match any process whose process group is ID. 151 If IDTYPE is P_ALL, match any process. 152 If the WNOHANG bit is set in OPTIONS, and that child 153 is not already dead, clear *INFOP and return 0. If successful, store 154 exit code and status in *INFOP. 155 156 This function is a cancellation point and therefore not marked with 157 __THROW. */ 158 extern int waitid (idtype_t __idtype, __id_t __id, siginfo_t *__infop, 159 int __options); 160 #endif 161 162 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 163 /* Wait for a child to exit. When one does, put its status in *STAT_LOC and 164 return its process ID. For errors return (pid_t) -1. If USAGE is not 165 nil, store information about the child's resource usage there. If the 166 WUNTRACED bit is set in OPTIONS, return status for stopped children; 167 otherwise don't. */ 168 extern __pid_t wait3 (__WAIT_STATUS __stat_loc, int __options, 169 struct rusage * __usage) __THROW; 170 #endif 171 172 #ifdef __USE_BSD 173 /* PID is like waitpid. Other args are like wait3. */ 174 extern __pid_t wait4 (__pid_t __pid, __WAIT_STATUS __stat_loc, int __options, 175 struct rusage *__usage) __THROW; 176 #endif /* Use BSD. */ 177 178 #ifdef _LIBC 179 extern __pid_t __wait4_nocancel(__pid_t, __WAIT_STATUS, int, struct rusage *) attribute_hidden; 180 #endif 181 182 183 __END_DECLS 184 185 #endif /* sys/wait.h */ 186