apr_proc_stub.c

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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.
 */
 
#include <kernel/OS.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
 
struct pipefd {
    int in;
    int out;
    int err;
};
 
int main(int argc, char *argv[]) {
/* we expect the following...
 * 
 * argv[0] = this stub
 * argv[1] = directory to run in...
 * argv[2] = progname to execute
 * rest of arguments to be passed to program
 */
    char *progname = argv[2];
    char *directory = argv[1];
    struct pipefd *pfd;
    thread_id sender;
    void *buffer;
    char ** newargs;
    int i = 0;
    
    newargs = (char**)malloc(sizeof(char*) * (argc - 1));
  
    buffer = (void*)malloc(sizeof(struct pipefd));
    /* this will block until we get the data */
    receive_data(&sender, buffer, sizeof(struct pipefd));
    pfd = (struct pipefd*)buffer;
    
    if (pfd->in > STDERR_FILENO) {
        if (dup2(pfd->in, STDIN_FILENO) != STDIN_FILENO) return (-1);
        close (pfd->in);
    }
    if (pfd->out > STDERR_FILENO) {
        if (dup2(pfd->out, STDOUT_FILENO) != STDOUT_FILENO) return (-1);
        close (pfd->out);
    }
    if (pfd->err > STDERR_FILENO) {
        if (dup2(pfd->err, STDERR_FILENO) != STDERR_FILENO) return (-1);
        close (pfd->err);
    }
 
    for (i=3;i<=argc;i++){
        newargs[i-3] = argv[i];
    }
    
    /* tell the caller we're OK to start */
    send_data(sender,1,NULL,0);
 
    if (directory != NULL)
        chdir(directory);
    execve (progname, newargs, environ);
 
    return (-1);
}