proc.c

一套很值得分析的短信SMS开发源代码。是我今年早些时候从taobao上买来的。但我现在也没看完（先说清楚

/* Copyright 2000-2005 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.
 */

#define INCL_DOS
#define INCL_DOSERRORS

#include "apr_arch_threadproc.h"
#include "apr_arch_file_io.h"
#include "apr_private.h"
#include "apr_thread_proc.h"
#include "apr_file_io.h"
#include "apr_general.h"
#include "apr_lib.h"
#include "apr_portable.h"
#include "apr_strings.h"
#include "apr_signal.h"
#include <signal.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
#include <process.h>
#include <stdlib.h>

APR_DECLARE(apr_status_t) apr_procattr_create(apr_procattr_t **new, apr_pool_t *pool)
{
    (*new) = (apr_procattr_t *)apr_palloc(pool, 
              sizeof(apr_procattr_t));

    if ((*new) == NULL) {
        return APR_ENOMEM;
    }
    (*new)->pool = pool;
    (*new)->parent_in = NULL;
    (*new)->child_in = NULL;
    (*new)->parent_out = NULL;
    (*new)->child_out = NULL;
    (*new)->parent_err = NULL;
    (*new)->child_err = NULL;
    (*new)->currdir = NULL; 
    (*new)->cmdtype = APR_PROGRAM;
    (*new)->detached = FALSE;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_io_set(apr_procattr_t *attr, apr_int32_t in, 
                                              apr_int32_t out, apr_int32_t err)
{
    apr_status_t stat;
    if (in) {
        if ((stat = apr_file_pipe_create(&attr->child_in, &attr->parent_in,
                                   attr->pool)) != APR_SUCCESS) {
            return stat;
        }
        switch (in) {
        case APR_FULL_BLOCK:
            break;
        case APR_PARENT_BLOCK:
            apr_file_pipe_timeout_set(attr->child_in, 0);
            break;
        case APR_CHILD_BLOCK:
            apr_file_pipe_timeout_set(attr->parent_in, 0);
            break;
        default:
            apr_file_pipe_timeout_set(attr->child_in, 0);
            apr_file_pipe_timeout_set(attr->parent_in, 0);
        }
    } 
    if (out) {
        if ((stat = apr_file_pipe_create(&attr->parent_out, &attr->child_out,
                                   attr->pool)) != APR_SUCCESS) {
            return stat;
        }
        switch (out) {
        case APR_FULL_BLOCK:
            break;
        case APR_PARENT_BLOCK:
            apr_file_pipe_timeout_set(attr->child_out, 0);
            break;
        case APR_CHILD_BLOCK:
            apr_file_pipe_timeout_set(attr->parent_out, 0);
            break;
        default:
            apr_file_pipe_timeout_set(attr->child_out, 0);
            apr_file_pipe_timeout_set(attr->parent_out, 0);
        }
    } 
    if (err) {
        if ((stat = apr_file_pipe_create(&attr->parent_err, &attr->child_err,
                                   attr->pool)) != APR_SUCCESS) {
            return stat;
        }
        switch (err) {
        case APR_FULL_BLOCK:
            break;
        case APR_PARENT_BLOCK:
            apr_file_pipe_timeout_set(attr->child_err, 0);
            break;
        case APR_CHILD_BLOCK:
            apr_file_pipe_timeout_set(attr->parent_err, 0);
            break;
        default:
            apr_file_pipe_timeout_set(attr->child_err, 0);
            apr_file_pipe_timeout_set(attr->parent_err, 0);
        }
    } 
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_child_in_set(apr_procattr_t *attr, apr_file_t *child_in,
                                                    apr_file_t *parent_in)
{
    if (attr->child_in == NULL && attr->parent_in == NULL)
        apr_file_pipe_create(&attr->child_in, &attr->parent_in, attr->pool);

    if (child_in != NULL)
        apr_file_dup(&attr->child_in, child_in, attr->pool);

    if (parent_in != NULL)
        apr_file_dup(&attr->parent_in, parent_in, attr->pool);

    return APR_SUCCESS;
}


APR_DECLARE(apr_status_t) apr_procattr_child_out_set(apr_procattr_t *attr, apr_file_t *child_out,
                                                     apr_file_t *parent_out)
{
    if (attr->child_out == NULL && attr->parent_out == NULL)
        apr_file_pipe_create(&attr->child_out, &attr->parent_out, attr->pool);

    if (child_out != NULL)
        apr_file_dup(&attr->child_out, child_out, attr->pool);

    if (parent_out != NULL)
        apr_file_dup(&attr->parent_out, parent_out, attr->pool);

    return APR_SUCCESS;
}


APR_DECLARE(apr_status_t) apr_procattr_child_err_set(apr_procattr_t *attr, apr_file_t *child_err,
                                                     apr_file_t *parent_err)
{
    if (attr->child_err == NULL && attr->parent_err == NULL)
        apr_file_pipe_create(&attr->child_err, &attr->parent_err, attr->pool);

    if (child_err != NULL)
        apr_file_dup(&attr->child_err, child_err, attr->pool);

    if (parent_err != NULL)
        apr_file_dup(&attr->parent_err, parent_err, attr->pool);

    return APR_SUCCESS;
}


APR_DECLARE(apr_status_t) apr_procattr_dir_set(apr_procattr_t *attr, const char *dir)
{
    attr->currdir = apr_pstrdup(attr->pool, dir);
    if (attr->currdir) {
        return APR_SUCCESS;
    }
    return APR_ENOMEM;
}

APR_DECLARE(apr_status_t) apr_procattr_cmdtype_set(apr_procattr_t *attr,
                                                   apr_cmdtype_e cmd) 
{
    attr->cmdtype = cmd;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_detach_set(apr_procattr_t *attr, apr_int32_t detach) 
{
    attr->detached = detach;
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_proc_fork(apr_proc_t *proc, apr_pool_t *pool)
{
    int pid;
    
    if ((pid = fork()) < 0) {
        return errno;
    }
    else if (pid == 0) {
        proc->pid = pid;
        proc->in = NULL; 
        proc->out = NULL; 
        proc->err = NULL; 
        return APR_INCHILD;
    }
    proc->pid = pid;
    proc->in = NULL; 
    proc->out = NULL; 
    proc->err = NULL; 
    return APR_INPARENT;
}



/* quotes in the string are doubled up.
 * Used to escape quotes in args passed to OS/2's cmd.exe
 */
static char *double_quotes(apr_pool_t *pool, const char *str)
{
    int num_quotes = 0;
    int len = 0;
    char *quote_doubled_str, *dest;
    
    while (str[len]) {
        num_quotes += str[len++] == '\"';
    }
    
    quote_doubled_str = apr_palloc(pool, len + num_quotes + 1);
    dest = quote_doubled_str;
    
    while (*str) {
        if (*str == '\"')
            *(dest++) = '\"';
        *(dest++) = *(str++);
    }
    
    *dest = 0;
    return quote_doubled_str;
}



APR_DECLARE(apr_status_t) apr_procattr_child_errfn_set(apr_procattr_t *attr,
                                                       apr_child_errfn_t *errfn)
{
    /* won't ever be called on this platform, so don't save the function pointer */
    return APR_SUCCESS;
}



APR_DECLARE(apr_status_t) apr_procattr_error_check_set(apr_procattr_t *attr,
                                                       apr_int32_t chk)
{
    /* won't ever be used on this platform, so don't save the flag */
    return APR_SUCCESS;
}

APR_DECLARE(apr_status_t) apr_procattr_addrspace_set(apr_procattr_t *attr,
                                                       apr_int32_t addrspace)
{
    /* won't ever be used on this platform, so don't save the flag */
    return APR_SUCCESS;
}



APR_DECLARE(apr_status_t) apr_proc_create(apr_proc_t *proc, const char *progname,
                                          const char * const *args,
                                          const char * const *env,
                                          apr_procattr_t *attr, apr_pool_t *pool)
{
    int i, arg, numargs, cmdlen;
    apr_status_t status;
    const char **newargs;
    char savedir[300];
    HFILE save_in, save_out, save_err, dup;
    int criticalsection = FALSE;
    char *extension, *newprogname, *extra_arg = NULL, *cmdline, *cmdline_pos;
    char interpreter[1024];
    char error_object[260];
    apr_file_t *progfile;
    int env_len, e;
    char *env_block, *env_block_pos;
    RESULTCODES rescodes;

    /* Prevent other threads from running while these process-wide resources are modified */
    if (attr->child_in || attr->child_out || attr->child_err || attr->currdir) {
        criticalsection = TRUE;
        DosEnterCritSec();
    }

    if (attr->child_in) {
        save_in = -1;
        DosDupHandle(STDIN_FILENO, &save_in);
        dup = STDIN_FILENO;
        DosDupHandle(attr->child_in->filedes, &dup);
        DosSetFHState(attr->parent_in->filedes, OPEN_FLAGS_NOINHERIT);
    }
    
    if (attr->child_out) {
        save_out = -1;
        DosDupHandle(STDOUT_FILENO, &save_out);