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. The
status is returned in $?. If you say
use POSIX "wait_h";
...
waitpid(™1,&WNOHANG);
then you can do a non™blocking wait for any process. Non™blocking wait
is only available on machines supporting either the waitpid(2) or
wait4(2) system calls. However, waiting for a particular pid with
FLAGS of 0 is implemented everywhere. (Perl emulates the system call
by remembering the status values of processes that have exited but have
not been harvested by the Perl script yet.)
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