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/
usr/
src/
courier-0.66.1/
waitlib/
- drwxrwxrwx
|
Viewing file:  waitlib.h (2.72 KB) -rw-rw-rw-Select action/file-type:  ( +) |  ( +) |  ( +) | Code ( +) | Session ( +) |  ( +) | SDB ( +) |  ( +) |  ( +) |  ( +) |  ( +) |  ( +) |
#ifndef waitlib_h
#define waitlib_h
/*
** Copyright 1998 - 1999 Double Precision, Inc.
** See COPYING for distribution information.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#if HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifndef WEXITSTATUS
#define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
#endif
#ifndef WIFEXITED
#define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
#endif
/*
** Ok, wait() pecularities are handled by the following functions. Except
** for them, nobody else should care about wait's quirks.
**
** First, call signal(SIGCHLD) as usual to set up your signal handler.
** Within the signal handler, call wait_reap to reap one (or more)
** child processes.
*/
void wait_reap( void (*)(pid_t, int), /* Called to process reaped child */
RETSIGTYPE (*)(int)); /* Should point back to signal handler */
/*
** Main program can call wait_block and wait_clear to temporarily
** suspend reaping while in a critical section.
*/
void wait_block();
void wait_clear(RETSIGTYPE (*)(int)); /* The signal handler */
/*
** wait_restore should be called instead of signal(SIGCHLD, SIG_DFL)
** to restore the signal handler just before exiting. It should also
** be called by any forked process.
*/
void wait_restore();
/*
** Sometimes the parent wants to wait for one child to terminate.
** call wait_forchild for that. First, wait_block() must be called to
** suspend all asynchronous reaping. Then, call wait_forchild. Before
** wait_forchild returns, the reaper function is guaranteed to be called.
** Asynchronous reaping is still blocked upon exit, call wait_clear() to
** reenable it.
*/
void wait_forchild( void (*)(pid_t, int), /* Reaper */
RETSIGTYPE (*)(int)); /* Signal handler stub */
/*
** wait_startchildren() is a convenient function to start a given number
** of child processes. The function returns 0 for the parent process, >0
** for each child process, and < 0 if there was an error starting child
** processes. pidptr points to a pointer to the array of started pids,
** which wait_startchildren initializes, if *pidptr is NULL, wait_startchildren
** mallocs this array. If pidptr is NULL, wait_startchildren uses its own
** internal array.
*/
int wait_startchildren(unsigned nchildren, pid_t **pidptr);
/*
** wait_reforkchild() is used in conjunction with wait_startchildren's array,
** and is intended to be called from the wait handler. It checks if the
** pid is one of the listed children, and, if so, reforks it.
** wait_reforkchild() returns < 0 if there was a problem reforking the child
** process, 0 if the child process started succesfully, or if the terminated
** pid is unknown, > 0 in the reforked process.
*/
int wait_reforkchild(unsigned nchildren, pid_t *pidptr, pid_t pid);
#endif
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