mpm_common.c revision 8ff84ed7af4420c7cfbafdbd2863cb3272bae256
0922cbe8300e97215564748d449824f458196335Lennart Poettering/* ====================================================================
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * The Apache Software License, Version 1.1
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * Copyright (c) 2000-2001 The Apache Software Foundation. All rights
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * Redistribution and use in source and binary forms, with or without
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * modification, are permitted provided that the following conditions
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * 1. Redistributions of source code must retain the above copyright
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * notice, this list of conditions and the following disclaimer.
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * 2. Redistributions in binary form must reproduce the above copyright
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * notice, this list of conditions and the following disclaimer in
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * the documentation and/or other materials provided with the
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * distribution.
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * 3. The end-user documentation included with the redistribution,
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * if any, must include the following acknowledgment:
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * "This product includes software developed by the
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * Apache Software Foundation (http://www.apache.org/)."
ef7963b561adec267dbc7dbdfc0d29105f2ca872Lennart Poettering * Alternately, this acknowledgment may appear in the software itself,
ef7963b561adec267dbc7dbdfc0d29105f2ca872Lennart Poettering * if and wherever such third-party acknowledgments normally appear.
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * 4. The names "Apache" and "Apache Software Foundation" must
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * not be used to endorse or promote products derived from this
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * software without prior written permission. For written
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * permission, please contact apache@apache.org.
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * 5. Products derived from this software may not be called "Apache",
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * nor may "Apache" appear in their name, without prior written
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * permission of the Apache Software Foundation.
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * SUCH DAMAGE.
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * ====================================================================
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * This software consists of voluntary contributions made by many
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * individuals on behalf of the Apache Software Foundation. For more
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * information on the Apache Software Foundation, please see
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * Portions of this software are based upon public domain software
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * originally written at the National Center for Supercomputing Applications,
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * University of Illinois, Urbana-Champaign.
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering/* The purpose of this file is to store the code that MOST mpm's will need
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * this does not mean a function only goes into this file if every MPM needs
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * it. It means that if a function is needed by more than one MPM, and
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * future maintenance would be served by making the code common, then the
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * function belongs here.
d4205751d4643c272059a3728045929dd0e5e800Lennart Poettering * This is going in src/main because it is not platform specific, it is
d4205751d4643c272059a3728045929dd0e5e800Lennart Poettering * specific to multi-process servers, but NOT to Unix. Which is why it
d4205751d4643c272059a3728045929dd0e5e800Lennart Poettering * does not belong in src/os/unix
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering#ifdef AP_MPM_NEEDS_RECLAIM_CHILD_PROCESSES
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poetteringvoid ap_reclaim_child_processes(int terminate)
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering long int waittime = 1024 * 16; /* in usecs */
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering ap_mpm_query(AP_MPMQ_MAX_DAEMONS, &max_daemons);
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering for (tries = terminate ? 4 : 1; tries <= 9; ++tries) {
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering /* don't want to hold up progress any more than
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * necessary, but we need to allow children a few moments to exit.
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * Set delay with an exponential backoff.
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering /* now see who is done */
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering for (i = 0; i < max_daemons; ++i) {
d4205751d4643c272059a3728045929dd0e5e800Lennart Poettering waitret = apr_proc_wait(&proc, APR_NOWAIT);
d4205751d4643c272059a3728045929dd0e5e800Lennart Poettering /* ok, now it's being annoying */
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
d4205751d4643c272059a3728045929dd0e5e800Lennart Poettering "child process %ld still did not exit, sending a SIGTERM",
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering /* die child scum */
d4205751d4643c272059a3728045929dd0e5e800Lennart Poettering ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR,
d4205751d4643c272059a3728045929dd0e5e800Lennart Poettering "child process %ld still did not exit, sending a SIGKILL",
772c552f763a125d17d814c4e5a35bbba49fc27aNis Martensen /* sending a SIGKILL kills the entire team on BeOS, and as
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * httpd thread is part of that team it removes any chance
772c552f763a125d17d814c4e5a35bbba49fc27aNis Martensen * of ever doing a restart. To counter this I'm changing to
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * use a kinder, gentler way of killing a specific thread
ba9904e9ce0628cce3bbd8106f6dc6914e418edaLennart Poettering * that is just as effective.
d4205751d4643c272059a3728045929dd0e5e800Lennart Poettering /* gave it our best shot, but alas... If this really
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * is a child we are trying to kill and it really hasn't
d4205751d4643c272059a3728045929dd0e5e800Lennart Poettering * exited, we will likely fail to bind to the port
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * after the restart.
d4205751d4643c272059a3728045929dd0e5e800Lennart Poettering ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR,
d4205751d4643c272059a3728045929dd0e5e800Lennart Poettering "could not make child process %ld exit, "
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering "attempting to continue anyway", (long)pid);
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering /* nothing left to wait for */
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering#endif /* NEED_RECLAIM_CHILD_PROCESSES */
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering/* number of calls to wait_or_timeout between writable probes */
d4205751d4643c272059a3728045929dd0e5e800Lennart Poetteringvoid ap_wait_or_timeout(apr_wait_t *status, apr_proc_t *ret, apr_pool_t *p)
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering rv = apr_proc_wait_all_procs(ret, status, APR_NOWAIT, p);
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering apr_sleep(SCOREBOARD_MAINTENANCE_INTERVAL);
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poetteringvoid ap_process_child_status(apr_proc_t *pid, apr_wait_t status)
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering const char *sigdesc = apr_signal_get_description(signum);
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering /* Child died... if it died due to a fatal error,
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering * we should simply bail out.
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering WEXITSTATUS(status) == APEXIT_CHILDFATAL) {
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, 0, ap_server_conf,
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering "Child %ld returned a Fatal error..." APR_EOL_STR
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering "Apache is exiting!",
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering "child pid %ld exit signal %s (%d), "
5190bbb240ab3360f7d37714d1c877858aef8c12Thomas Hindoe Paaboel Andersen "possible coredump in %s",
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
5d6a86d7a034a1fb3d6e3f1b58e2c13739270894Lennart Poettering "child pid %ld exit signal %s (%d)",
20ad4cfd8e5592f634f20468798cbc1055ab9fafZbigniew Jędrzejewski-Szmek#if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)
20ad4cfd8e5592f634f20468798cbc1055ab9fafZbigniew Jędrzejewski-Szmekvoid ap_sock_disable_nagle(apr_socket_t *s)
20ad4cfd8e5592f634f20468798cbc1055ab9fafZbigniew Jędrzejewski-Szmek /* The Nagle algorithm says that we should delay sending partial
20ad4cfd8e5592f634f20468798cbc1055ab9fafZbigniew Jędrzejewski-Szmek * packets in hopes of getting more data. We don't want to do
20ad4cfd8e5592f634f20468798cbc1055ab9fafZbigniew Jędrzejewski-Szmek * this; we are not telnet. There are bad interactions between
20ad4cfd8e5592f634f20468798cbc1055ab9fafZbigniew Jędrzejewski-Szmek * persistent connections and Nagle's algorithm that have very severe
20ad4cfd8e5592f634f20468798cbc1055ab9fafZbigniew Jędrzejewski-Szmek * performance penalties. (Failing to disable Nagle is not much of a
20ad4cfd8e5592f634f20468798cbc1055ab9fafZbigniew Jędrzejewski-Szmek * problem with simple HTTP.)
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering * In spite of these problems, failure here is not a shooting offense.
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering apr_status_t status = apr_setsocketopt(s, APR_TCP_NODELAY, 1);
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering ap_log_error(APLOG_MARK, APLOG_WARNING, status, ap_server_conf,
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart Poettering "setsockopt: (TCP_NODELAY)");
9444b1f20e311f073864d81e913bd4f32fe95cfdLennart PoetteringAP_DECLARE(uid_t) ap_uname2id(const char *name)
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, "%s: bad user name %s", ap_server_argv0, name);
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, "%s: bad group name %s", ap_server_argv0, name); exit(1);
#ifndef HAVE_INITGROUPS
#if defined(QNX) || defined(MPE) || defined(BEOS) || defined(_OSD_POSIX) || defined(TPF) || defined(__TANDEM) || defined(OS2) || defined(WIN32)
struct group *g;
int index = 0;
setgrent();
char **names;
endgrent();
#ifdef AP_MPM_USES_POD
(*pod)->p = p;
return rv;
return APR_SUCCESS;
return rv;
return AP_NORESTART;
return rv;
return rv;
return rv;
return rv;
return rv;
return rv;
return APR_SUCCESS;
for (i = 0; i < num; i++) {