os.c

Apache HTTP Server 是一个功能强大的灵活的与HTTP/1.1相兼容的web服务器.这里给出的是Apache HTTP服务器的源码。

/* Copyright 1999-2005 The Apache Software Foundation or its licensors, as
 * applicable.
 *
 * Licensed 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.
 */

/*
 * This file will include OS specific functions which are not inlineable.
 * Any inlineable functions should be defined in os-inline.c instead.
 */

#include "httpd.h"
#include "http_core.h"
#include "os.h"
#include "scoreboard.h"
#include "http_log.h"

static FILE *sock_fp;

#ifndef __PIPE_
int pipe(int fildes[2])
{
    errno = ENOSYS;
    return(-1);
}
#endif
  
/* fork and exec functions are not defined on
   TPF due to the implementation of tpf_fork() */
 
pid_t fork(void)
{
    errno = ENOSYS;
    return(-1);
}

int execl(const char *path, const char *arg0, ...)
{
    errno = ENOSYS;
    return(-1);
}

int execle(const char *path, const char *arg0, ...)
{
    errno = ENOSYS;
    return(-1);
}

int execve(const char *path, char *const argv[], char *const envp[])
{
    errno = ENOSYS;
    return(-1);
}

int execvp(const char *file, char *const argv[])
{
    errno = ENOSYS;
    return(-1);
}


pid_t os_fork(server_rec *s, int slot)
{
    struct tpf_fork_input fork_input;
    APACHE_TPF_INPUT input_parms;
    int count;
    listen_rec *lr;

    fflush(stdin);
    if (dup2(fileno(sock_fp), STDIN_FILENO) == -1)
        ap_log_error(APLOG_MARK, APLOG_CRIT, errno, s,
        "unable to replace stdin with sock device driver");
    fflush(stdout);
    if (dup2(fileno(sock_fp), STDOUT_FILENO) == -1)
        ap_log_error(APLOG_MARK, APLOG_CRIT, errno, s,
        "unable to replace stdout with sock device driver");
    input_parms.generation = ap_my_generation;
    input_parms.scoreboard_heap = ap_scoreboard_image;

    lr = ap_listeners;
    count = 0;
    do {
        input_parms.listeners[count] = lr->fd;
        lr = lr->next;
        count++;
    } while(lr != ap_listeners);

    input_parms.slot = slot;
    input_parms.restart_time = ap_restart_time;
    fork_input.ebw_data = &input_parms;
    fork_input.program = ap_server_argv0;
    fork_input.prog_type = TPF_FORK_NAME;
    fork_input.istream = TPF_FORK_IS_BALANCE;
    fork_input.ebw_data_length = sizeof(input_parms);
    fork_input.parm_data = "-x";
    return tpf_fork(&fork_input);
}

int os_check_server(char *server) {
#ifndef USE_TPF_DAEMON
    int rv;
    int *current_acn;
    if((rv = inetd_getServerStatus(server)) == INETD_SERVER_STATUS_INACTIVE)
        return 1;
    else {
        current_acn = (int *)cinfc_fast(CINFC_CMMACNUM);
        if(ecbp2()->ce2acn != *current_acn)
            return 1;
    }
#endif
    return 0;
}

AP_DECLARE(apr_status_t) ap_os_create_privileged_process(
    const request_rec *r,
    apr_proc_t *newproc, const char *progname,
    const char * const *args,
    const char * const *env,
    apr_procattr_t *attr, apr_pool_t *p)
{
    return apr_proc_create(newproc, progname, args, env, attr, p);
}