1 /* ====================================================================
2 * The Apache Software License, Version 1.1
4 * Copyright (c) 2000 The Apache Software Foundation. All rights
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. The end-user documentation included with the redistribution,
20 * if any, must include the following acknowledgment:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowledgment may appear in the software itself,
24 * if and wherever such third-party acknowledgments normally appear.
26 * 4. The names "Apache" and "Apache Software Foundation" must
27 * not be used to endorse or promote products derived from this
28 * software without prior written permission. For written
29 * permission, please contact apache@apache.org.
31 * 5. Products derived from this software may not be called "Apache",
32 * nor may "Apache" appear in their name, without prior written
33 * permission of the Apache Software Foundation.
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47 * ====================================================================
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>.
54 * Portions of this software are based upon public domain software
55 * originally written at the National Center for Supercomputing Applications,
56 * University of Illinois, Urbana-Champaign.
59 /* The purpose of this file is to store the code that MOST mpm's will need
60 * this does not mean a function only goes into this file if every MPM needs
61 * it. It means that if a function is needed by more than one MPM, and
62 * future maintenance would be served by making the code common, then the
63 * function belongs here.
65 * This is going in src/main because it is not platform specific, it is
66 * specific to multi-process servers, but NOT to Unix. Which is why it
67 * does not belong in src/os/unix
70 #include "apr_thread_proc.h"
72 #include "http_config.h"
75 #include "mpm_common.h"
78 #define CHILD_INFO_TABLE ap_child_table
79 #elif defined(MPMT_PTHREAD_MPM) || defined (PREFORK_MPM)
80 #define CHILD_INFO_TABLE ap_scoreboard_image->parent
84 void ap_reclaim_child_processes(int terminate)
87 long int waittime = 1024 * 16; /* in usecs */
93 ap_sync_scoreboard_image();
96 for (tries = terminate ? 4 : 1; tries <= 9; ++tries) {
97 /* don't want to hold up progress any more than
98 * necessary, but we need to allow children a few moments to exit.
99 * Set delay with an exponential backoff.
101 tv.tv_sec = waittime / 1000000;
102 tv.tv_usec = waittime % 1000000;
103 waittime = waittime * 4;
104 ap_select(0, NULL, NULL, NULL, &tv);
106 /* now see who is done */
108 for (i = 0; i < ap_max_daemons_limit; ++i) {
109 pid_t pid = CHILD_INFO_TABLE[i].pid;
112 if (ap_child_table[i].status == SERVER_DEAD)
113 #elif defined(MPMT_PTHREAD_MPM) || defined (PREFORK_MPM)
114 if (pid == ap_my_pid || pid == 0)
118 waitret = waitpid(pid, &status, WNOHANG);
119 if (waitret == pid || waitret == -1) {
121 ap_child_table[i].status = SERVER_DEAD;
122 #elif defined(MPMT_PTHREAD_MPM) || defined(PREFORK_MPM)
123 ap_scoreboard_image->parent[i].pid = 0;
137 /* ok, now it's being annoying */
138 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
140 "child process %ld still did not exit, sending a SIGTERM",
146 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR,
148 "child process %ld still did not exit, sending a SIGKILL",
153 /* gave it our best shot, but alas... If this really
154 * is a child we are trying to kill and it really hasn't
155 * exited, we will likely fail to bind to the port
158 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR,
160 "could not make child process %ld exit, "
161 "attempting to continue anyway", (long)pid);
165 ap_check_other_child();
167 /* nothing left to wait for */
173 /* number of calls to wait_or_timeout between writable probes */
174 #ifndef INTERVAL_OF_WRITABLE_PROBES
175 #define INTERVAL_OF_WRITABLE_PROBES 10
177 static int wait_or_timeout_counter;
179 ap_proc_t *ap_wait_or_timeout(ap_wait_t *status, ap_pool_t *p)
183 ap_proc_t *ret = ap_pcalloc(p, sizeof(ret));
185 ++wait_or_timeout_counter;
186 if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
187 wait_or_timeout_counter = 0;
188 #ifdef APR_HAS_OTHER_CHILD
189 ap_probe_writable_fds();
192 rv = ap_wait_all_procs(ret, status, APR_NOWAIT, p);
193 if (ap_canonical_error(rv) == APR_EINTR) {
196 if (rv == APR_CHILD_DONE) {
200 if ((ret = reap_children(status)) > 0) {
204 tv.tv_sec = SCOREBOARD_MAINTENANCE_INTERVAL / 1000000;
205 tv.tv_usec = SCOREBOARD_MAINTENANCE_INTERVAL % 1000000;
206 ap_select(0, NULL, NULL, NULL, &tv);