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.\" ========================================================================
.\"
.IX Title "Wait3 3pm"
.TH Wait3 3pm "2011-02-16" "perl v5.20.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Proc::Wait3 \- Perl extension for wait3 system call
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Proc::Wait3;
\&
\&  ($pid, $status, $utime, $stime, $maxrss, $ixrss, $idrss, $isrss,
\&  $minflt, $majflt, $nswap, $inblock, $oublock, $msgsnd, $msgrcv,
\&  $nsignals, $nvcsw, $nivcsw) = wait3(0); # doesn\*(Aqt wait
\&
\&  ($pid, $status, $utime, $stime, $maxrss, $ixrss, $idrss, $isrss,
\&  $minflt, $majflt, $nswap, $inblock, $oublock, $msgsnd, $msgrcv,
\&  $nsignals, $nvcsw, $nivcsw) = wait3(1); # waits for a child
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
If any child processes have exited, this call will \*(L"reap\*(R" the zombies
similar to the perl \*(L"wait\*(R" function.
.PP
By default, it will return immediately and if there are no dead
children, everything will be undefined.  If you pass in a true
argument, it will block until a child exits (or it gets a signal).
.PP
.Vb 1
\& $pid         PID of exiting child
\&
\& $status      exit status of child, just like C<$?>
\&
\& $utime       floating point user cpu seconds
\&
\& $stime       floating point system cpu seconds
\&
\& $maxrss      the maximum resident set size utilized (in kilobytes).
\&
\& $minflt      the number of page faults serviced without any I/O
\&              activity; here I/O activity is avoided by "reclaiming" a
\&              page frame from the list of pages awaiting reallocation.
\&
\& $majflt      the number of page faults serviced that required I/O
\&              activity.
\&
\& $nswap       the number of times a process was "swapped" out of main
\&              memory.
\&
\& $inblock     the number of times the file system had to perform input.
\&
\& $oublock     the number of times the file system had to perform output.
\&
\& $msgsnd      the number of messages sent over sockets.
\&
\& $msgrcv      the number of messages received from sockets.
\&
\& $nsignals    the number of signals delivered.
\&
\& $nvcsw       the number of times a context switch resulted due to a
\&              process voluntarily giving up the processor before its
\&              time slice was completed (usually to await availability of
\&              a resource).
\&
\& $nivcsw      the number of times a context switch resulted due to a
\&              higher priority process becoming runnable or because the
\&              current process exceeded its time slice.
.Ve
.SH "AUTHOR"
.IX Header "AUTHOR"
C. Tilmes <curt@tilmes.org>
.SH "LICENSE"
.IX Header "LICENSE"
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
perl, wait3, getrusage.