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/*
* Copyright (c) 1983 Regents of the University of California, (c) 1998 David Faure.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*
* (BSD License, from tdelibs/doc/common/bsd-license.html)
*/
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include "includ.h"
#include "proto.h"
static int nb_child_to_wait=0;
#undef DEBUG_THREADS
/** Register a new process (by just increasing the number of children */
void new_process()
{
nb_child_to_wait++;
#ifdef DEBUG_THREADS
debug("New Child. Nb child to wait : %d",nb_child_to_wait);
#endif
}
/** Wait for a given process - not registered - and see if others exited */
int wait_process(int pid)
{
int val, status;
do {
val = wait(&status);
if (val == -1) {
if (errno == EINTR)
continue;
/* shouldn't happen */
syslog(LOG_WARNING, "announce: wait: %s", strerror(errno));
return 1;
}
if (val != pid) {
nb_child_to_wait--;
#ifdef DEBUG_THREADS
debug("Child exited. Nb child to wait : %d",nb_child_to_wait);
#endif
}
} while (val != pid);
return status;
}
/** Wait for children (if any) to exit. Return 1 if no more child to wait */
int ack_process()
{
if (nb_child_to_wait>0)
{
int pid;
do {
pid = waitpid(-1,0,WNOHANG);
if (pid==-1)
syslog(LOG_ERR,"Timeout. Error waiting for child.");
if ((pid!=0) & (nb_child_to_wait>0)) {
nb_child_to_wait--;
#ifdef DEBUG_THREADS
debug("Child exited as expected. Nb child to wait : %d",nb_child_to_wait);
#endif
}
} while ((pid>0) && (nb_child_to_wait>0));
return 0;
} else return 1; /* ok for exiting */
}
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