mysql_waitpid signals a process to terminate
and waits for the process to exit. It uses the
kill() system call and Unix signals, so it
runs on Unix and Unix-like systems.
Invoke mysql_waitpid like this:
mysql_waitpid sends signal 0 to the process
pid and waits up to
wait_time seconds for the process to
wait_time must be positive integers.
If process termination occurs within the wait time or the process does not exist, mysql_waitpid returns 0. Otherwise, it returns 1.
kill() system call cannot handle
signal 0, mysql_waitpid() uses signal 1
mysql_waitpid supports the following options: