1 /* Copyright (C) 1991-2021 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 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 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 /* 19 * POSIX Standard: 3.2.1 Wait for Process Termination <sys/wait.h> 20 */ 21 22 #ifndef _SYS_WAIT_H 23 #define _SYS_WAIT_H 1 24 25 #include <features.h> 26 27 __BEGIN_DECLS 28 29 #include <bits/types.h> 30 #ifndef __pid_t_defined 31 typedef __pid_t pid_t; 32 # define __pid_t_defined 33 #endif 34 35 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 36 # include <signal.h> 37 #endif 38 39 #if defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8 40 /* Some older standards require the contents of struct rusage to be 41 defined here. */ 42 # include <bits/types/struct_rusage.h> 43 #endif 44 45 /* These macros could also be defined in <stdlib.h>. */ 46 #if !defined _STDLIB_H || (!defined __USE_XOPEN && !defined __USE_XOPEN2K8) 47 /* This will define the `W*' macros for the flag 48 bits to `waitpid', `wait3', and `wait4'. */ 49 # include <bits/waitflags.h> 50 51 /* This will define all the `__W*' macros. */ 52 # include <bits/waitstatus.h> 53 54 # define WEXITSTATUS(status) __WEXITSTATUS (status) 55 # define WTERMSIG(status) __WTERMSIG (status) 56 # define WSTOPSIG(status) __WSTOPSIG (status) 57 # define WIFEXITED(status) __WIFEXITED (status) 58 # define WIFSIGNALED(status) __WIFSIGNALED (status) 59 # define WIFSTOPPED(status) __WIFSTOPPED (status) 60 # ifdef __WIFCONTINUED 61 # define WIFCONTINUED(status) __WIFCONTINUED (status) 62 # endif 63 #endif /* <stdlib.h> not included. */ 64 65 #ifdef __USE_MISC 66 # define WCOREFLAG __WCOREFLAG 67 # define WCOREDUMP(status) __WCOREDUMP (status) 68 # define W_EXITCODE(ret, sig) __W_EXITCODE (ret, sig) 69 # define W_STOPCODE(sig) __W_STOPCODE (sig) 70 #endif 71 72 /* The following values are used by the `waitid' function. */ 73 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 74 typedef enum 75 { 76 P_ALL, /* Wait for any child. */ 77 P_PID, /* Wait for specified process. */ 78 P_PGID /* Wait for members of process group. */ 79 } idtype_t; 80 #endif 81 82 83 /* Wait for a child to die. When one does, put its status in *STAT_LOC 84 and return its process ID. For errors, return (pid_t) -1. 85 86 This function is a cancellation point and therefore not marked with 87 __THROW. */ 88 extern __pid_t wait (int *__stat_loc); 89 90 #ifdef __USE_MISC 91 /* Special values for the PID argument to `waitpid' and `wait4'. */ 92 # define WAIT_ANY (-1) /* Any process. */ 93 # define WAIT_MYPGRP 0 /* Any process in my process group. */ 94 #endif 95 96 /* Wait for a child matching PID to die. 97 If PID is greater than 0, match any process whose process ID is PID. 98 If PID is (pid_t) -1, match any process. 99 If PID is (pid_t) 0, match any process with the 100 same process group as the current process. 101 If PID is less than -1, match any process whose 102 process group is the absolute value of PID. 103 If the WNOHANG bit is set in OPTIONS, and that child 104 is not already dead, return (pid_t) 0. If successful, 105 return PID and store the dead child's status in STAT_LOC. 106 Return (pid_t) -1 for errors. If the WUNTRACED bit is 107 set in OPTIONS, return status for stopped children; otherwise don't. 108 109 This function is a cancellation point and therefore not marked with 110 __THROW. */ 111 extern __pid_t waitpid (__pid_t __pid, int *__stat_loc, int __options); 112 113 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 114 # ifndef __id_t_defined 115 typedef __id_t id_t; 116 # define __id_t_defined 117 # endif 118 119 # include <bits/types/siginfo_t.h> 120 121 /* Wait for a childing matching IDTYPE and ID to change the status and 122 place appropriate information in *INFOP. 123 If IDTYPE is P_PID, match any process whose process ID is ID. 124 If IDTYPE is P_PGID, match any process whose process group is ID. 125 If IDTYPE is P_ALL, match any process. 126 If the WNOHANG bit is set in OPTIONS, and that child 127 is not already dead, clear *INFOP and return 0. If successful, store 128 exit code and status in *INFOP. 129 130 This function is a cancellation point and therefore not marked with 131 __THROW. */ 132 extern int waitid (idtype_t __idtype, __id_t __id, siginfo_t *__infop, 133 int __options); 134 #endif 135 136 #if defined __USE_MISC \ 137 || (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K) 138 /* This being here makes the prototypes valid whether or not 139 we have already included <sys/resource.h> to define `struct rusage'. */ 140 struct rusage; 141 142 /* Wait for a child to exit. When one does, put its status in *STAT_LOC and 143 return its process ID. For errors return (pid_t) -1. If USAGE is not 144 nil, store information about the child's resource usage there. If the 145 WUNTRACED bit is set in OPTIONS, return status for stopped children; 146 otherwise don't. */ 147 # ifndef __USE_TIME_BITS64 148 extern __pid_t wait3 (int *__stat_loc, int __options, 149 struct rusage * __usage) __THROWNL; 150 # else 151 # ifdef __REDIRECT_NTHNL 152 extern __pid_t __REDIRECT_NTHNL (wait3, (int *__stat_loc, int __options, 153 struct rusage * __usage), 154 __wait3_time64); 155 # else 156 # define wait3 __wait3_time64 157 # endif 158 # endif 159 #endif 160 161 #ifdef __USE_MISC 162 # ifndef __USE_TIME_BITS64 163 /* PID is like waitpid. Other args are like wait3. */ 164 extern __pid_t wait4 (__pid_t __pid, int *__stat_loc, int __options, 165 struct rusage *__usage) __THROWNL; 166 # else 167 # ifdef __REDIRECT_NTHNL 168 extern __pid_t __REDIRECT_NTHNL (wait4, (__pid_t __pid, int *__stat_loc, 169 int __options, struct rusage *__usage), 170 __wait4_time64); 171 # else 172 # define wait4 __wait4_time64 173 # endif 174 # endif 175 #endif /* Use misc. */ 176 177 178 __END_DECLS 179 180 #endif /* sys/wait.h */ 181