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, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20 /* 21 * POSIX Standard: 3.2.1 Wait for Process Termination <sys/wait.h> 22 */ 23 24 #ifndef _SYS_WAIT_H 25 #define _SYS_WAIT_H 1 26 27 #include <features.h> 28 29 __BEGIN_DECLS 30 31 #include <signal.h> 32 #include <sys/resource.h> 33 34 /* These macros could also be defined in <stdlib.h>. */ 35 #if !defined _STDLIB_H || !defined __USE_XOPEN 36 /* This will define the `W*' macros for the flag 37 bits to `waitpid', `wait3', and `wait4'. */ 38 # include <bits/waitflags.h> 39 40 # ifdef __USE_BSD 41 42 /* Lots of hair to allow traditional BSD use of `union wait' 43 as well as POSIX.1 use of `int' for the status word. */ 44 45 # if defined __GNUC__ && !defined __cplusplus 46 # define __WAIT_INT(status) \ 47 (__extension__ (((union { __typeof(status) __in; int __i; }) \ 48 { .__in = (status) }).__i)) 49 # else 50 # define __WAIT_INT(status) (*(__const int *) &(status)) 51 # endif 52 53 /* This is the type of the argument to `wait'. The funky union 54 causes redeclarations with either `int *' or `union wait *' to be 55 allowed without complaint. __WAIT_STATUS_DEFN is the type used in 56 the actual function definitions. */ 57 58 # if !defined __GNUC__ || __GNUC__ < 2 || defined __cplusplus 59 # define __WAIT_STATUS void * 60 # define __WAIT_STATUS_DEFN void * 61 # else 62 /* This works in GCC 2.6.1 and later. */ 63 typedef union 64 { 65 union wait *__uptr; 66 int *__iptr; 67 } __WAIT_STATUS __attribute__ ((__transparent_union__)); 68 # define __WAIT_STATUS_DEFN int * 69 # endif 70 71 # else /* Don't use BSD. */ 72 73 # define __WAIT_INT(status) (status) 74 # define __WAIT_STATUS int * 75 # define __WAIT_STATUS_DEFN int * 76 77 # endif /* Use BSD. */ 78 79 /* This will define all the `__W*' macros. */ 80 # include <bits/waitstatus.h> 81 82 # define WEXITSTATUS(status) __WEXITSTATUS (__WAIT_INT (status)) 83 # define WTERMSIG(status) __WTERMSIG (__WAIT_INT (status)) 84 # define WSTOPSIG(status) __WSTOPSIG (__WAIT_INT (status)) 85 # define WIFEXITED(status) __WIFEXITED (__WAIT_INT (status)) 86 # define WIFSIGNALED(status) __WIFSIGNALED (__WAIT_INT (status)) 87 # define WIFSTOPPED(status) __WIFSTOPPED (__WAIT_INT (status)) 88 # ifdef __WIFCONTINUED 89 # define WIFCONTINUED(status) __WIFCONTINUED (__WAIT_INT (status)) 90 # endif 91 #endif /* <stdlib.h> not included. */ 92 93 #ifdef __USE_BSD 94 # define WCOREFLAG __WCOREFLAG 95 # define WCOREDUMP(status) __WCOREDUMP (__WAIT_INT (status)) 96 # define W_EXITCODE(ret, sig) __W_EXITCODE (ret, sig) 97 # define W_STOPCODE(sig) __W_STOPCODE (sig) 98 #endif 99 100 /* The following values are used by the `waitid' function. */ 101 #if defined __USE_SVID || defined __USE_XOPEN 102 typedef enum 103 { 104 P_ALL, /* Wait for any child. */ 105 P_PID, /* Wait for specified process. */ 106 P_PGID /* Wait for members of process group. */ 107 } idtype_t; 108 #endif 109 110 111 /* Wait for a child to die. When one does, put its status in *STAT_LOC 112 and return its process ID. For errors, return (pid_t) -1. 113 114 This function is a cancellation point and therefore not marked with 115 __THROW. */ 116 extern __pid_t wait (__WAIT_STATUS __stat_loc); 117 118 #ifdef __USE_BSD 119 /* Special values for the PID argument to `waitpid' and `wait4'. */ 120 # define WAIT_ANY (-1) /* Any process. */ 121 # define WAIT_MYPGRP 0 /* Any process in my process group. */ 122 #endif 123 124 /* Wait for a child matching PID to die. 125 If PID is greater than 0, match any process whose process ID is PID. 126 If PID is (pid_t) -1, match any process. 127 If PID is (pid_t) 0, match any process with the 128 same process group as the current process. 129 If PID is less than -1, match any process whose 130 process group is the absolute value of PID. 131 If the WNOHANG bit is set in OPTIONS, and that child 132 is not already dead, return (pid_t) 0. If successful, 133 return PID and store the dead child's status in STAT_LOC. 134 Return (pid_t) -1 for errors. If the WUNTRACED bit is 135 set in OPTIONS, return status for stopped children; otherwise don't. 136 137 This function is a cancellation point and therefore not marked with 138 __THROW. */ 139 extern __pid_t waitpid (__pid_t __pid, int *__stat_loc, int __options); 140 141 #if defined __USE_SVID || defined __USE_XOPEN 142 # define __need_siginfo_t 143 # include <bits/siginfo.h> 144 /* Wait for a childing matching IDTYPE and ID to change the status and 145 place appropriate information in *INFOP. 146 If IDTYPE is P_PID, match any process whose process ID is ID. 147 If IDTYPE is P_PGID, match any process whose process group is ID. 148 If IDTYPE is P_ALL, match any process. 149 If the WNOHANG bit is set in OPTIONS, and that child 150 is not already dead, clear *INFOP and return 0. If successful, store 151 exit code and status in *INFOP. 152 153 This function is a cancellation point and therefore not marked with 154 __THROW. */ 155 extern int waitid (idtype_t __idtype, __id_t __id, siginfo_t *__infop, 156 int __options); 157 #endif 158 159 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 160 /* This being here makes the prototypes valid whether or not 161 we have already included <sys/resource.h> to define `struct rusage'. */ 162 struct rusage; 163 164 /* Wait for a child to exit. When one does, put its status in *STAT_LOC and 165 return its process ID. For errors return (pid_t) -1. If USAGE is not 166 nil, store information about the child's resource usage there. If the 167 WUNTRACED bit is set in OPTIONS, return status for stopped children; 168 otherwise don't. */ 169 extern __pid_t wait3 (__WAIT_STATUS __stat_loc, int __options, 170 struct rusage * __usage) __THROW; 171 #endif 172 173 #ifdef __USE_BSD 174 /* PID is like waitpid. Other args are like wait3. */ 175 extern __pid_t wait4 (__pid_t __pid, __WAIT_STATUS __stat_loc, int __options, 176 struct rusage *__usage) __THROW; 177 #endif /* Use BSD. */ 178 179 180 __END_DECLS 181 182 #endif /* sys/wait.h */ 183
