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

        dup = STDOUT_FILENO;
        DosDupHandle(attr->child_out->filedes, &dup);
        DosSetFHState(attr->parent_out->filedes, OPEN_FLAGS_NOINHERIT);
    }
    
    if (attr->child_err) {
        save_err = -1;
        DosDupHandle(STDERR_FILENO, &save_err);
        dup = STDERR_FILENO;
        DosDupHandle(attr->child_err->filedes, &dup);
        DosSetFHState(attr->parent_err->filedes, OPEN_FLAGS_NOINHERIT);
    }

    apr_signal(SIGCHLD, SIG_DFL); /*not sure if this is needed or not */

    if (attr->currdir != NULL) {
        _getcwd2(savedir, sizeof(savedir));
        
        if (_chdir2(attr->currdir) < 0) {
            if (criticalsection)
                DosExitCritSec();
            return errno;
        }
    }

    interpreter[0] = 0;
    extension = strrchr(progname, '.');

    if (extension == NULL || strchr(extension, '/') || strchr(extension, '\\'))
        extension = "";

    /* ### how to handle APR_PROGRAM_ENV and APR_PROGRAM_PATH? */

    if (attr->cmdtype == APR_SHELLCMD ||
        attr->cmdtype == APR_SHELLCMD_ENV ||
        strcasecmp(extension, ".cmd") == 0) {
        strcpy(interpreter, "#!" SHELL_PATH);
        extra_arg = "/C";
    } else if (stricmp(extension, ".exe") != 0) {
        status = apr_file_open(&progfile, progname, APR_READ|APR_BUFFERED, 0, pool);

        if (status != APR_SUCCESS && APR_STATUS_IS_ENOENT(status)) {
            progname = apr_pstrcat(pool, progname, ".exe", NULL);
        }

        if (status == APR_SUCCESS) {
            status = apr_file_gets(interpreter, sizeof(interpreter), progfile);

            if (status == APR_SUCCESS) {
                if (interpreter[0] == '#' && interpreter[1] == '!') {
                    /* delete CR/LF & any other whitespace off the end */
                    int end = strlen(interpreter) - 1;

                    while (end >= 0 && apr_isspace(interpreter[end])) {
                        interpreter[end] = '\0';
                        end--;
                    }

                    if (interpreter[2] != '/' && interpreter[2] != '\\' && interpreter[3] != ':') {
                        char buffer[300];

                        if (DosSearchPath(SEARCH_ENVIRONMENT, "PATH", interpreter+2, buffer, sizeof(buffer)) == 0) {
                            strcpy(interpreter+2, buffer);
                        } else {
                            strcat(interpreter, ".exe");
                            if (DosSearchPath(SEARCH_ENVIRONMENT, "PATH", interpreter+2, buffer, sizeof(buffer)) == 0) {
                                strcpy(interpreter+2, buffer);
                            }
                        }
                    }
                } else {
                    interpreter[0] = 0;
                }
            }

            apr_file_close(progfile);
        }
    }

    i = 0;

    while (args && args[i]) {
        i++;
    }

    newargs = (const char **)apr_palloc(pool, sizeof (char *) * (i + 4));
    numargs = 0;

    if (interpreter[0])
        newargs[numargs++] = interpreter + 2;
    if (extra_arg)
        newargs[numargs++] = "/c";

    newargs[numargs++] = newprogname = apr_pstrdup(pool, progname);
    arg = 1;

    while (args && args[arg]) {
        newargs[numargs++] = args[arg++];
    }

    newargs[numargs] = NULL;

    for (i=0; newprogname[i]; i++)
        if (newprogname[i] == '/')
            newprogname[i] = '\\';

    cmdlen = 0;

    for (i=0; i<numargs; i++)
        cmdlen += strlen(newargs[i]) + 3;

    cmdline = apr_palloc(pool, cmdlen + 2);
    cmdline_pos = cmdline;

    for (i=0; i<numargs; i++) {
        const char *a = newargs[i];

        if (strpbrk(a, "&|<>\" "))
            a = apr_pstrcat(pool, "\"", double_quotes(pool, a), "\"", NULL);

        if (i)
            *(cmdline_pos++) = ' ';

        strcpy(cmdline_pos, a);
        cmdline_pos += strlen(cmdline_pos);
    }

    *(++cmdline_pos) = 0; /* Add required second terminator */
    cmdline_pos = strchr(cmdline, ' ');

    if (cmdline_pos) {
        *cmdline_pos = 0;
        cmdline_pos++;
    }

    /* Create environment block from list of envariables */
    if (env) {
        for (env_len=1, e=0; env[e]; e++)
            env_len += strlen(env[e]) + 1;

        env_block = apr_palloc(pool, env_len);
        env_block_pos = env_block;

        for (e=0; env[e]; e++) {
            strcpy(env_block_pos, env[e]);
            env_block_pos += strlen(env_block_pos) + 1;
        }

        *env_block_pos = 0; /* environment block is terminated by a double null */
    } else
        env_block = NULL;

    status = DosExecPgm(error_object, sizeof(error_object),
                        attr->detached ? EXEC_BACKGROUND : EXEC_ASYNCRESULT,
                        cmdline, env_block, &rescodes, cmdline);

    proc->pid = rescodes.codeTerminate;

    if (attr->currdir != NULL) {
        chdir(savedir);
    }

    if (attr->child_in) {
        apr_file_close(attr->child_in);
        dup = STDIN_FILENO;
        DosDupHandle(save_in, &dup);
        DosClose(save_in);
    }
    
    if (attr->child_out) {
        apr_file_close(attr->child_out);
        dup = STDOUT_FILENO;
        DosDupHandle(save_out, &dup);
        DosClose(save_out);
    }
    
    if (attr->child_err) {
        apr_file_close(attr->child_err);
        dup = STDERR_FILENO;
        DosDupHandle(save_err, &dup);
        DosClose(save_err);
    }

    if (criticalsection)
        DosExitCritSec();

    proc->in = attr->parent_in;
    proc->err = attr->parent_err;
    proc->out = attr->parent_out;
    return status;
}



static void proces_result_codes(RESULTCODES codes, 
                                int *exitcode, 
                                apr_exit_why_e *exitwhy)
{
    int result = 0;
    apr_exit_why_e why = APR_PROC_EXIT;

    switch (codes.codeTerminate) {
    case TC_EXIT:        /* Normal exit */
        why = APR_PROC_EXIT;
        result = codes.codeResult;
        break;

    case TC_HARDERROR:   /* Hard error halt */
        why = APR_PROC_SIGNAL;
        result = SIGSYS;
        break;

    case TC_KILLPROCESS: /* Was killed by a DosKillProcess() */
        why = APR_PROC_SIGNAL;
        result = SIGKILL;
        break;

    case TC_TRAP:        /* TRAP in 16 bit code */
    case TC_EXCEPTION:   /* Threw an exception (32 bit code) */
        why = APR_PROC_SIGNAL;

        switch (codes.codeResult | XCPT_FATAL_EXCEPTION) {
        case XCPT_ACCESS_VIOLATION:
            result = SIGSEGV;
            break;

        case XCPT_ILLEGAL_INSTRUCTION:
            result = SIGILL;
            break;

        case XCPT_FLOAT_DIVIDE_BY_ZERO:
        case XCPT_INTEGER_DIVIDE_BY_ZERO:
            result = SIGFPE;
            break;

        default:
            result = codes.codeResult;
            break;
        }
    }

    if (exitcode) {
        *exitcode = result;
    }

    if (exitwhy) {
        *exitwhy = why;
    }
}



APR_DECLARE(apr_status_t) apr_proc_wait_all_procs(apr_proc_t *proc,
                                                  int *exitcode,
                                                  apr_exit_why_e *exitwhy,
                                                  apr_wait_how_e waithow,
                                                  apr_pool_t *p)
{
    RESULTCODES codes;
    ULONG rc;
    PID pid;

    rc = DosWaitChild(DCWA_PROCESSTREE, waithow == APR_WAIT ? DCWW_WAIT : DCWW_NOWAIT, &codes, &pid, 0);

    if (rc == 0) {
        proc->pid = pid;
        proces_result_codes(codes, exitcode, exitwhy);
        return APR_CHILD_DONE;
    } else if (rc == ERROR_CHILD_NOT_COMPLETE) {
        return APR_CHILD_NOTDONE;
    }

    return APR_OS2_STATUS(rc);
} 



APR_DECLARE(apr_status_t) apr_proc_wait(apr_proc_t *proc,
                                        int *exitcode, apr_exit_why_e *exitwhy,
                                        apr_wait_how_e waithow)
{
    RESULTCODES codes;
    ULONG rc;
    PID pid;
    rc = DosWaitChild(DCWA_PROCESS, waithow == APR_WAIT ? DCWW_WAIT : DCWW_NOWAIT, &codes, &pid, proc->pid);

    if (rc == 0) {
        proces_result_codes(codes, exitcode, exitwhy);
        return APR_CHILD_DONE;
    } else if (rc == ERROR_CHILD_NOT_COMPLETE) {
        return APR_CHILD_NOTDONE;
    }

    return APR_OS2_STATUS(rc);
} 



APR_DECLARE(apr_status_t) apr_proc_detach(int daemonize)
{
    return APR_ENOTIMPL;
}