wait.h
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上传日期:2009-04-28
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- /* Copyright (C) 1991-1994,1996-2001,2003,2004 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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- /*
- * 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 <signal.h>
- #include <sys/resource.h>
- /* These macros could also be defined in <stdlib.h>. */
- #if !defined _STDLIB_H || !defined __USE_XOPEN
- /* This will define the `W*' macros for the flag
- bits to `waitpid', `wait3', and `wait4'. */
- # include <bits/waitflags.h>
- # ifdef __USE_BSD
- /* Lots of hair to allow traditional BSD use of `union wait'
- as well as POSIX.1 use of `int' for the status word. */
- # if defined __GNUC__ && !defined __cplusplus
- # define __WAIT_INT(status)
- (__extension__ ({ union { __typeof(status) __in; int __i; } __u;
- __u.__in = (status); __u.__i; }))
- # else
- # define __WAIT_INT(status) (*(int *) &(status))
- # endif
- /* This is the type of the argument to `wait'. The funky union
- causes redeclarations with ether `int *' or `union wait *' to be
- allowed without complaint. __WAIT_STATUS_DEFN is the type used in
- the actual function definitions. */
- # if !defined __GNUC__ || __GNUC__ < 2 || defined __cplusplus
- # define __WAIT_STATUS void *
- # define __WAIT_STATUS_DEFN void *
- # else
- /* This works in GCC 2.6.1 and later. */
- typedef union
- {
- union wait *__uptr;
- int *__iptr;
- } __WAIT_STATUS __attribute__ ((__transparent_union__));
- # define __WAIT_STATUS_DEFN int *
- # endif
- # else /* Don't use BSD. */
- # define __WAIT_INT(status) (status)
- # define __WAIT_STATUS int *
- # define __WAIT_STATUS_DEFN int *
- # endif /* Use BSD. */
- /* This will define all the `__W*' macros. */
- # include <bits/waitstatus.h>
- # define WEXITSTATUS(status) __WEXITSTATUS(__WAIT_INT(status))
- # define WTERMSIG(status) __WTERMSIG(__WAIT_INT(status))
- # define WSTOPSIG(status) __WSTOPSIG(__WAIT_INT(status))
- # define WIFEXITED(status) __WIFEXITED(__WAIT_INT(status))
- # define WIFSIGNALED(status) __WIFSIGNALED(__WAIT_INT(status))
- # define WIFSTOPPED(status) __WIFSTOPPED(__WAIT_INT(status))
- # ifdef __WIFCONTINUED
- # define WIFCONTINUED(status) __WIFCONTINUED(__WAIT_INT(status))
- # endif
- #endif /* <stdlib.h> not included. */
- #ifdef __USE_BSD
- # define WCOREFLAG __WCOREFLAG
- # define WCOREDUMP(status) __WCOREDUMP(__WAIT_INT(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_SVID || defined __USE_XOPEN
- 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 (__WAIT_STATUS __stat_loc);
- #ifdef __USE_BSD
- /* 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_SVID || defined __USE_XOPEN
- # define __need_siginfo_t
- # include <bits/siginfo.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_BSD || defined __USE_XOPEN_EXTENDED
- /* 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. */
- extern __pid_t wait3 (__WAIT_STATUS __stat_loc, int __options,
- struct rusage * __usage) __THROW;
- #endif
- #ifdef __USE_BSD
- /* This being here makes the prototypes valid whether or not
- we have already included <sys/resource.h> to define `struct rusage'. */
- struct rusage;
- /* PID is like waitpid. Other args are like wait3. */
- extern __pid_t wait4 (__pid_t __pid, __WAIT_STATUS __stat_loc, int __options,
- struct rusage *__usage) __THROW;
- #endif /* Use BSD. */
- __END_DECLS
- #endif /* sys/wait.h */