Вопрос по языку Perl

Svetlana_kafa

VitMix

       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

               $?.  If you say

                   use POSIX ":sys_wait_h";

                   #...

                   do {

                       $kid = waitpid(-1,&WNOHANG);

                   } until $kid == -1;

               then you can do a non-blocking wait for all pending zombie

               processes.  Non-blocking wait is 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.)

               Note that on some systems, a return value of -1 could mean that

               child processes are being automatically reaped.  See the

               perlipc manpage for details, and for other examples.

Svetlana_kafa

Svetlana_kafa

VitMix