1 /* Copyright (C) 1991-1994,1996-2001,2003,2004,2005,2007,2009,2010,2011,2012 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 32 /* These macros could also be defined in <stdlib.h>. */ 33 #if !defined _STDLIB_H || (!defined __USE_XOPEN && !defined __USE_XOPEN2K8) 34 /* This will define the `W*' macros for the flag 35 bits to `waitpid', `wait3', and `wait4'. */ 36 # include <bits/waitflags.h> 37 38 # ifdef __USE_BSD 39 40 /* Lots of hair to allow traditional BSD use of `union wait' 41 as well as POSIX.1 use of `int' for the status word. */ 42 43 # if defined __GNUC__ && !defined __cplusplus 44 # define __WAIT_INT(status) \ 45 (__extension__ (((union { __typeof(status) __in; int __i; }) \ 46 { .__in = (status) }).__i)) 47 # else 48 # define __WAIT_INT(status) (*(const int *) &(status)) 49 # endif 50 51 /* This is the type of the argument to `wait'. The funky union 52 causes redeclarations with either `int *' or `union wait *' to be 53 allowed without complaint. __WAIT_STATUS_DEFN is the type used in 54 the actual function definitions. */ 55 56 # if !defined __GNUC__ || __GNUC__ < 2 || defined __cplusplus 57 # define __WAIT_STATUS void * 58 # define __WAIT_STATUS_DEFN void * 59 # else 60 /* This works in GCC 2.6.1 and later. */ 61 typedef union 62 { 63 union wait *__uptr; 64 int *__iptr; 65 } __WAIT_STATUS __attribute__ ((__transparent_union__)); 66 # define __WAIT_STATUS_DEFN int * 67 # endif 68 69 # else /* Don't use BSD. */ 70 71 # define __WAIT_INT(status) (status) 72 # define __WAIT_STATUS int * 73 # define __WAIT_STATUS_DEFN int * 74 75 # endif /* Use BSD. */ 76 77 /* This will define all the `__W*' macros. */ 78 # include <bits/waitstatus.h> 79 80 # define WEXITSTATUS(status) __WEXITSTATUS (__WAIT_INT (status)) 81 # define WTERMSIG(status) __WTERMSIG (__WAIT_INT (status)) 82 # define WSTOPSIG(status) __WSTOPSIG (__WAIT_INT (status)) 83 # define WIFEXITED(status) __WIFEXITED (__WAIT_INT (status)) 84 # define WIFSIGNALED(status) __WIFSIGNALED (__WAIT_INT (status)) 85 # define WIFSTOPPED(status) __WIFSTOPPED (__WAIT_INT (status)) 86 # ifdef __WIFCONTINUED 87 # define WIFCONTINUED(status) __WIFCONTINUED (__WAIT_INT (status)) 88 # endif 89 #endif /* <stdlib.h> not included. */ 90 91 #ifdef __USE_BSD 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) 96 #endif 97 98 /* The following values are used by the `waitid' function. */ 99 #if defined __USE_SVID || defined __USE_XOPEN || defined __USE_XOPEN2K8 100 typedef enum 101 { 102 P_ALL, /* Wait for any child. */ 103 P_PID, /* Wait for specified process. */ 104 P_PGID /* Wait for members of process group. */ 105 } idtype_t; 106 #endif 107 108 109 /* Wait for a child to die. When one does, put its status in *STAT_LOC 110 and return its process ID. For errors, return (pid_t) -1. 111 112 This function is a cancellation point and therefore not marked with 113 __THROW. */ 114 extern __pid_t wait (__WAIT_STATUS __stat_loc); 115 116 #ifdef __USE_BSD 117 /* Special values for the PID argument to `waitpid' and `wait4'. */ 118 # define WAIT_ANY (-1) /* Any process. */ 119 # define WAIT_MYPGRP 0 /* Any process in my process group. */ 120 #endif 121 122 /* Wait for a child matching PID to die. 123 If PID is greater than 0, match any process whose process ID is PID. 124 If PID is (pid_t) -1, match any process. 125 If PID is (pid_t) 0, match any process with the 126 same process group as the current process. 127 If PID is less than -1, match any process whose 128 process group is the absolute value of PID. 129 If the WNOHANG bit is set in OPTIONS, and that child 130 is not already dead, return (pid_t) 0. If successful, 131 return PID and store the dead child's status in STAT_LOC. 132 Return (pid_t) -1 for errors. If the WUNTRACED bit is 133 set in OPTIONS, return status for stopped children; otherwise don't. 134 135 This function is a cancellation point and therefore not marked with 136 __THROW. */ 137 extern __pid_t waitpid (__pid_t __pid, int *__stat_loc, int __options); 138 139 #if defined __USE_SVID || defined __USE_XOPEN || defined __USE_XOPEN2K8 140 # ifndef __id_t_defined 141 # include <bits/types.h> 142 typedef __id_t id_t; 143 # define __id_t_defined 144 # endif 145 146 # define __need_siginfo_t 147 # include <bits/siginfo.h> 148 149 /* Wait for a childing matching IDTYPE and ID to change the status and 150 place appropriate information in *INFOP. 151 If IDTYPE is P_PID, match any process whose process ID is ID. 152 If IDTYPE is P_PGID, match any process whose process group is ID. 153 If IDTYPE is P_ALL, match any process. 154 If the WNOHANG bit is set in OPTIONS, and that child 155 is not already dead, clear *INFOP and return 0. If successful, store 156 exit code and status in *INFOP. 157 158 This function is a cancellation point and therefore not marked with 159 __THROW. */ 160 extern int waitid (idtype_t __idtype, __id_t __id, siginfo_t *__infop, 161 int __options); 162 #endif 163 164 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 165 /* This being here makes the prototypes valid whether or not 166 we have already included <sys/resource.h> to define `struct rusage'. */ 167 struct rusage; 168 169 /* Wait for a child to exit. When one does, put its status in *STAT_LOC and 170 return its process ID. For errors return (pid_t) -1. If USAGE is not 171 nil, store information about the child's resource usage there. If the 172 WUNTRACED bit is set in OPTIONS, return status for stopped children; 173 otherwise don't. */ 174 extern __pid_t wait3 (__WAIT_STATUS __stat_loc, int __options, 175 struct rusage * __usage) __THROWNL; 176 #endif 177 178 #ifdef __USE_BSD 179 /* PID is like waitpid. Other args are like wait3. */ 180 extern __pid_t wait4 (__pid_t __pid, __WAIT_STATUS __stat_loc, int __options, 181 struct rusage *__usage) __THROWNL; 182 #endif /* Use BSD. */ 183 184 185 __END_DECLS 186 187 #endif /* sys/wait.h */ 188