/* exec */
int para_exec_cmdline_pid(pid_t *pid, const char *cmdline, int *fds);
-/* signal */
-int para_signal_init(void);
-int para_install_sighandler(int);
-void para_reap_children(void);
-pid_t para_reap_child(void);
-int para_next_signal(void);
-
/* time */
int tv_diff(const struct timeval *b, const struct timeval *a, struct timeval *diff);
long unsigned tv2ms(const struct timeval*);