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wait.h
/* Copyright (C) 1991-2021 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ /* * POSIX Standard: 3.2.1 Wait for Process Termination <sys/wait.h> */ #ifndef _SYS_WAIT_H #define _SYS_WAIT_H 1 #include <features.h> __BEGIN_DECLS #include <bits/types.h> #ifndef __pid_t_defined typedef __pid_t pid_t; # define __pid_t_defined #endif #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 # include <signal.h> #endif #if defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8 /* Some older standards require the contents of struct rusage to be defined here. */ # include <bits/types/struct_rusage.h> #endif /* These macros could also be defined in <stdlib.h>. */ #if !defined _STDLIB_H || (!defined __USE_XOPEN && !defined __USE_XOPEN2K8) /* This will define the `W*' macros for the flag bits to `waitpid', `wait3', and `wait4'. */ # include <bits/waitflags.h> /* This will define all the `__W*' macros. */ # include <bits/waitstatus.h> # define WEXITSTATUS(status) __WEXITSTATUS (status) # define WTERMSIG(status) __WTERMSIG (status) # define WSTOPSIG(status) __WSTOPSIG (status) # define WIFEXITED(status) __WIFEXITED (status) # define WIFSIGNALED(status) __WIFSIGNALED (status) # define WIFSTOPPED(status) __WIFSTOPPED (status) # ifdef __WIFCONTINUED # define WIFCONTINUED(status) __WIFCONTINUED (status) # endif #endif /* <stdlib.h> not included. */ #ifdef __USE_MISC # define WCOREFLAG __WCOREFLAG # define WCOREDUMP(status) __WCOREDUMP (status) # define W_EXITCODE(ret, sig) __W_EXITCODE (ret, sig) # define W_STOPCODE(sig) __W_STOPCODE (sig) #endif /* The following values are used by the `waitid' function. */ #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 typedef enum { P_ALL, /* Wait for any child. */ P_PID, /* Wait for specified process. */ P_PGID /* Wait for members of process group. */ } idtype_t; #endif /* Wait for a child to die. When one does, put its status in *STAT_LOC and return its process ID. For errors, return (pid_t) -1. This function is a cancellation point and therefore not marked with __THROW. */ extern __pid_t wait (int *__stat_loc); #ifdef __USE_MISC /* Special values for the PID argument to `waitpid' and `wait4'. */ # define WAIT_ANY (-1) /* Any process. */ # define WAIT_MYPGRP 0 /* Any process in my process group. */ #endif /* Wait for a child matching PID to die. If PID is greater than 0, match any process whose process ID is PID. If PID is (pid_t) -1, match any process. If PID is (pid_t) 0, match any process with the same process group as the current process. If PID is less than -1, match any process whose process group is the absolute value of PID. If the WNOHANG bit is set in OPTIONS, and that child is not already dead, return (pid_t) 0. If successful, return PID and store the dead child's status in STAT_LOC. Return (pid_t) -1 for errors. If the WUNTRACED bit is set in OPTIONS, return status for stopped children; otherwise don't. This function is a cancellation point and therefore not marked with __THROW. */ extern __pid_t waitpid (__pid_t __pid, int *__stat_loc, int __options); #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 # ifndef __id_t_defined typedef __id_t id_t; # define __id_t_defined # endif # include <bits/types/siginfo_t.h> /* Wait for a childing matching IDTYPE and ID to change the status and place appropriate information in *INFOP. If IDTYPE is P_PID, match any process whose process ID is ID. If IDTYPE is P_PGID, match any process whose process group is ID. If IDTYPE is P_ALL, match any process. If the WNOHANG bit is set in OPTIONS, and that child is not already dead, clear *INFOP and return 0. If successful, store exit code and status in *INFOP. This function is a cancellation point and therefore not marked with __THROW. */ extern int waitid (idtype_t __idtype, __id_t __id, siginfo_t *__infop, int __options); #endif #if defined __USE_MISC \ || (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K) /* This being here makes the prototypes valid whether or not we have already included <sys/resource.h> to define `struct rusage'. */ struct rusage; /* Wait for a child to exit. When one does, put its status in *STAT_LOC and return its process ID. For errors return (pid_t) -1. If USAGE is not nil, store information about the child's resource usage there. If the WUNTRACED bit is set in OPTIONS, return status for stopped children; otherwise don't. */ # ifndef __USE_TIME_BITS64 extern __pid_t wait3 (int *__stat_loc, int __options, struct rusage * __usage) __THROWNL; # else # ifdef __REDIRECT_NTHNL extern __pid_t __REDIRECT_NTHNL (wait3, (int *__stat_loc, int __options, struct rusage * __usage), __wait3_time64); # else # define wait3 __wait3_time64 # endif # endif #endif #ifdef __USE_MISC # ifndef __USE_TIME_BITS64 /* PID is like waitpid. Other args are like wait3. */ extern __pid_t wait4 (__pid_t __pid, int *__stat_loc, int __options, struct rusage *__usage) __THROWNL; # else # ifdef __REDIRECT_NTHNL extern __pid_t __REDIRECT_NTHNL (wait4, (__pid_t __pid, int *__stat_loc, int __options, struct rusage *__usage), __wait4_time64); # else # define wait4 __wait4_time64 # endif # endif #endif /* Use misc. */ __END_DECLS #endif /* sys/wait.h */
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