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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2001 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.
*/
#include "apr.h"
#include "apr_strings.h"
#include "apr_lock.h"
#define APR_WANT_STRFUNC
#include "apr_want.h"
#include "httpd.h"
#include "http_config.h"
#include "http_log.h"
#include "http_main.h"
#include "mpm.h"
#include "pod.h"
#include "mpm_common.h"
#include "ap_mpm.h"
#include "ap_listen.h"
#include "mpm_default.h"
AP_DECLARE(apr_status_t) ap_mpm_pod_open(apr_pool_t *p, ap_pod_t **pod)
{
apr_status_t rv;
*pod = apr_palloc(p, sizeof(**pod));
rv = apr_file_pipe_create(&((*pod)->pod_in), &((*pod)->pod_out), p);
if (rv != APR_SUCCESS) {
return rv;
}
/*
apr_file_pipe_timeout_set((*pod)->pod_in, 0);
*/
(*pod)->p = p;
apr_sockaddr_info_get(&(*pod)->sa, ap_listeners->bind_addr->hostname,
APR_UNSPEC, ap_listeners->bind_addr->port, 0, p);
return APR_SUCCESS;
}
AP_DECLARE(int) ap_mpm_pod_check(ap_pod_t *pod)
{
char c;
apr_size_t len = 1;
apr_status_t rv;
rv = apr_file_read(pod->pod_in, &c, &len);
if ((rv == APR_SUCCESS) && (len ==1)) {
if (c == RESTART_CHAR) {
return AP_RESTART;
}
if (c == GRACEFUL_CHAR) {
return AP_GRACEFUL;
}
}
else if (rv != APR_SUCCESS) {
return rv;
}
return AP_NORESTART;
}
AP_DECLARE(apr_status_t) ap_mpm_pod_close(ap_pod_t *pod)
{
apr_status_t rv;
rv = apr_file_close(pod->pod_out);
if (rv != APR_SUCCESS) {
return rv;
}
rv = apr_file_close(pod->pod_in);
if (rv != APR_SUCCESS) {
return rv;
}
return rv;
}
static apr_status_t pod_signal_internal(ap_pod_t *pod, int graceful)
{
apr_status_t rv;
char char_of_death = graceful ? GRACEFUL_CHAR : RESTART_CHAR;
apr_size_t one = 1;
do {
rv = apr_file_write(pod->pod_out, &char_of_death, &one);
} while (APR_STATUS_IS_EINTR(rv));
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf,
"write pipe_of_death");
}
return rv;
}
/* This function connects to the server, then immediately closes the connection.
* This permits the MPM to skip the poll when there is only one listening
* socket, because it provides a alternate way to unblock an accept() when
* the pod is used.
*/
static apr_status_t dummy_connection(ap_pod_t *pod)
{
apr_status_t rv;
apr_socket_t *sock;
apr_pool_t *p;
/* create a temporary pool for the socket. pconf stays around too long */
rv = apr_pool_create(&p, pod->p);
if (rv != APR_SUCCESS) {
return rv;
}
rv = apr_socket_create(&sock, pod->sa->family, SOCK_STREAM, p);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf,
"get socket to connect to listener");
return rv;
}
/* on some platforms (e.g., FreeBSD), the kernel won't accept many
* queued connections before it starts blocking local connects...
* we need to keep from blocking too long and instead return an error,
* because the MPM won't want to hold up a graceful restart for a
* long time
*/
rv = apr_setsocketopt(sock, APR_SO_TIMEOUT, 3 * APR_USEC_PER_SEC);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf,
"set timeout on socket to connect to listener");
apr_socket_close(sock);
return rv;
}
rv = apr_connect(sock, pod->sa);
if (rv != APR_SUCCESS) {
int log_level = APLOG_WARNING;
if (APR_STATUS_IS_TIMEUP(rv)) {
/* probably some server processes bailed out already and there
* is nobody around to call accept and clear out the kernel
* connection queue; usually this is not worth logging
*/
log_level = APLOG_DEBUG;
}
ap_log_error(APLOG_MARK, log_level, rv, ap_server_conf,
"connect to listener");
}
apr_socket_close(sock);
apr_pool_destroy(p);
return rv;
}
AP_DECLARE(apr_status_t) ap_mpm_pod_signal(ap_pod_t *pod, int graceful)
{
apr_status_t rv;
rv = pod_signal_internal(pod, graceful);
if (rv != APR_SUCCESS) {
return rv;
}
return dummy_connection(pod);
}
AP_DECLARE(void) ap_mpm_pod_killpg(ap_pod_t *pod, int num, int graceful)
{
int i;
apr_status_t rv = APR_SUCCESS;
for (i = 0; i < num && rv == APR_SUCCESS; i++) {
rv = pod_signal_internal(pod, graceful);
}
if (rv == APR_SUCCESS) {
for (i = 0; i < num && rv == APR_SUCCESS; i++) {
rv = dummy_connection(pod);
}
}
}
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