(PHP 4 >= 4.0.7, PHP 5)
pcntl_wstopsig — Returns the signal which caused the child to stop
Returns the number of the signal which caused the child to stop. This function is only useful if pcntl_wifstopped() returned TRUE.
status 参数是提供给成功调用的 pcntl_waitpid() 函数的状态参数。
Returns the signal number.