fork/exec 이후 deadlock

int tr_system(const char * ls_command)
{
    pid_t pid;
    int   status;
    int   tm_delta;
    time_t wait_end_tm;
    time_t wait_start_tm;
    int   n_close_socket = 0;
    char *args[] = {"/bin/sh", "-c", ls_command, NULL}; 
 
    DEBUGH("[%s] Enter : command='%s'", __func__, ls_command);
 
    if (ls_command == NULL || strlen(ls_command) == 0) {
        ERRN("[%s] Error, Invalid input parameter : command is NULL zero length ptr=%p", __func__, ls_command);
        return -1;
    }
 
    pid = fork();
 
    if(pid == -1) {
        ERRN("[%s] Error, Fail to fork : command='%s'", __func__, ls_command);
        return -1;
    }
 
    if(pid == 0) {
        n_close_socket = close_opened_fd(); /* child process : Close ALL socket fd */
        if (execv(args[0], args) == -1) {
            exit(127);
        }
        exit(127);
    }
    else {
        wait_start_tm = time(NULL);
        waitpid(pid, &status, 0);
        wait_end_tm = time(NULL);
        tm_delta    = wait_end_tm - wait_start_tm;
        status      = htons(status);
        if (127 == status) {
            ERRN("[%s] Error, Fail to execv : subs_pid=%d, status=%d, command='%s'", __func__, pid, status, ls_command);
        }
        else {
            DEBUGH("[%s] Execute command ended : escapes_time=%d, subs_pid=%d, status=%d, command='%s'", __func__, tm_delta, pid, status, ls_command);
        }
    }
 
    return status;
}