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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
/* The purpose of this file is to store the code that MOST mpm's will need
* this does not mean a function only goes into this file if every MPM needs
* it. It means that if a function is needed by more than one MPM, and
* future maintenance would be served by making the code common, then the
* function belongs here.
*
* This is going in src/main because it is not platform specific, it is
* specific to multi-process servers, but NOT to Unix. Which is why it
* does not belong in src/os/unix
*/
#include "apr_thread_proc.h"
#include "httpd.h"
#include "http_config.h"
#include "http_log.h"
#include "mpm.h"
#include "mpm_common.h"
#ifdef DEXTER_MPM
#define CHILD_INFO_TABLE ap_child_table
#elif defined(MPMT_PTHREAD_MPM) || defined (PREFORK_MPM)
#define CHILD_INFO_TABLE ap_scoreboard_image->parent
#endif
void ap_reclaim_child_processes(int terminate)
{
int i, status;
long int waittime = 1024 * 16; /* in usecs */
struct timeval tv;
int waitret, tries;
int not_dead_yet;
#ifndef DEXTER_MPM
ap_sync_scoreboard_image();
#endif
for (tries = terminate ? 4 : 1; tries <= 9; ++tries) {
/* don't want to hold up progress any more than
* necessary, but we need to allow children a few moments to exit.
* Set delay with an exponential backoff.
*/
tv.tv_sec = waittime / 1000000;
tv.tv_usec = waittime % 1000000;
waittime = waittime * 4;
ap_select(0, NULL, NULL, NULL, &tv);
/* now see who is done */
not_dead_yet = 0;
for (i = 0; i < ap_max_daemons_limit; ++i) {
pid_t pid = CHILD_INFO_TABLE[i].pid;
#ifdef DEXTER_MPM
if (ap_child_table[i].status == SERVER_DEAD)
#elif defined(MPMT_PTHREAD_MPM) || defined (PREFORK_MPM)
if (pid == ap_my_pid || pid == 0)
#endif
continue;
waitret = waitpid(pid, &status, WNOHANG);
if (waitret == pid || waitret == -1) {
#ifdef DEXTER_MPM
ap_child_table[i].status = SERVER_DEAD;
#elif defined(MPMT_PTHREAD_MPM) || defined(PREFORK_MPM)
ap_scoreboard_image->parent[i].pid = 0;
#endif
continue;
}
++not_dead_yet;
switch (tries) {
case 1: /* 16ms */
case 2: /* 82ms */
break;
case 3: /* 344ms */
case 4: /* 16ms */
case 5: /* 82ms */
case 6: /* 344ms */
case 7: /* 1.4sec */
/* ok, now it's being annoying */
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
0, ap_server_conf,
"child process %ld still did not exit, sending a SIGTERM",
(long)pid);
kill(pid, SIGTERM);
break;
case 8: /* 6 sec */
/* die child scum */
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR,
0, ap_server_conf,
"child process %ld still did not exit, sending a SIGKILL",
(long)pid);
kill(pid, SIGKILL);
break;
case 9: /* 14 sec */
/* gave it our best shot, but alas... If this really
* is a child we are trying to kill and it really hasn't
* exited, we will likely fail to bind to the port
* after the restart.
*/
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR,
0, ap_server_conf,
"could not make child process %ld exit, "
"attempting to continue anyway", (long)pid);
break;
}
}
ap_check_other_child();
if (!not_dead_yet) {
/* nothing left to wait for */
break;
}
}
}
/* number of calls to wait_or_timeout between writable probes */
#ifndef INTERVAL_OF_WRITABLE_PROBES
#define INTERVAL_OF_WRITABLE_PROBES 10
#endif
static int wait_or_timeout_counter;
ap_proc_t *ap_wait_or_timeout(ap_wait_t *status, ap_pool_t *p)
{
struct timeval tv;
ap_status_t rv;
ap_proc_t *ret = ap_pcalloc(p, sizeof(*ret));
++wait_or_timeout_counter;
if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
wait_or_timeout_counter = 0;
#ifdef APR_HAS_OTHER_CHILD
ap_probe_writable_fds();
#endif
}
rv = ap_wait_all_procs(ret, status, APR_NOWAIT, p);
if (ap_canonical_error(rv) == APR_EINTR) {
return NULL;
}
if (rv == APR_CHILD_DONE) {
return ret;
}
#ifdef NEED_WAITPID
if ((ret = reap_children(status)) > 0) {
return ret;
}
#endif
tv.tv_sec = SCOREBOARD_MAINTENANCE_INTERVAL / 1000000;
tv.tv_usec = SCOREBOARD_MAINTENANCE_INTERVAL % 1000000;
ap_select(0, NULL, NULL, NULL, &tv);
return NULL;
}
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