## 例

`

     int pcntl_wait ( int &$status [, int $options = 0 ] )

`

## 説明

The wait function suspends execution of the current process until a child has exited, or until a signal is delivered whose action is to terminate the current process or to call a signal handling function. If a child has already exited by the time of the call (a so-called "zombie" process), the function returns immediately. Any system resources used by the child are freed. Please see your system's wait(2) man page for specific details as to how wait works on your system. Note: This function is equivalent to calling pcntl_waitpid() with a -1 pid and no options.

## 戻り値

pcntl_wait() returns the process ID of the child which exited, -1 on error or zero if WNOHANG was provided as an option (on wait3-available systems) and no child was available.