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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* util_mutex.c: Useful functions for determining allowable
* mutexes and mutex settings
*/
#include "apr.h"
#include "apr_strings.h"
#include "apr_lib.h"
#define APR_WANT_STRFUNC
#include "apr_want.h"
#include "ap_config.h"
#include "httpd.h"
#include "http_main.h"
#include "http_config.h"
#include "util_mutex.h"
AP_DECLARE(apr_status_t) ap_parse_mutex(const char *arg, apr_pool_t *pool,
apr_lockmech_e *mutexmech,
const char **mutexfile)
{
/* Split arg into meth and file */
char *meth = apr_pstrdup(pool, arg);
char *file = strchr(meth, ':');
if (file) {
*(file++) = '\0';
if (!*file) {
file = NULL;
}
}
if (!strcasecmp(meth, "none") || !strcasecmp(meth, "no")) {
return APR_ENOLOCK;
}
/* APR determines temporary filename unless overridden below,
* we presume file indicates an mutexfile is a file path
* unless the method sets mutexfile=file and NULLs file
*/
*mutexfile = NULL;
/* NOTE: previously, 'yes' implied 'sem' */
if (!strcasecmp(meth, "default") || !strcasecmp(meth, "yes")) {
*mutexmech = APR_LOCK_DEFAULT;
}
#if APR_HAS_FCNTL_SERIALIZE
else if (!strcasecmp(meth, "fcntl") || !strcasecmp(meth, "file")) {
*mutexmech = APR_LOCK_FCNTL;
}
#endif
#if APR_HAS_FLOCK_SERIALIZE
else if (!strcasecmp(meth, "flock") || !strcasecmp(meth, "file")) {
*mutexmech = APR_LOCK_FLOCK;
}
#endif
#if APR_HAS_POSIXSEM_SERIALIZE
else if (!strcasecmp(meth, "posixsem") || !strcasecmp(meth, "sem")) {
*mutexmech = APR_LOCK_POSIXSEM;
/* Posix/SysV semaphores aren't file based, use the literal name
* if provided and fall back on APR's default if not. Today, APR
* will ignore it, but once supported it has an absurdly short limit.
*/
if (file) {
*mutexfile = apr_pstrdup(pool, file);
file = NULL;
}
}
#endif
#if APR_HAS_SYSVSEM_SERIALIZE && !defined(PERCHILD_MPM)
else if (!strcasecmp(meth, "sysvsem") || !strcasecmp(meth, "sem")) {
*mutexmech = APR_LOCK_SYSVSEM;
}
#endif
#if APR_HAS_PROC_PTHREAD_SERIALIZE
else if (!strcasecmp(meth, "pthread")) {
*mutexmech = APR_LOCK_PROC_PTHREAD;
}
#endif
else {
return APR_ENOTIMPL;
}
/* Unless the method above assumed responsibility for setting up
* mutexfile and NULLing out file, presume it is a file we
* are looking to use
*/
if (file) {
*mutexfile = ap_server_root_relative(pool, file);
if (!*mutexfile) {
return APR_BADARG;
}
}
return APR_SUCCESS;
}
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