waitpid PID,FLAGS
Waits for a particular child process to terminate and returns the pid of the deceased process, or -1 if there is no such child process. On some systems, a value of 0 indicates that there are processes still running. The status is returned in $? and ${^CHILD_ERROR_NATIVE} . If you say
use POSIX ":sys_wait_h";
#...
do {
$kid = waitpid(-1, WNOHANG);
} while $kid > 0;
then you can do a non-blocking wait for all pending zombie processes. Non-blocking wait is available on ma