#!/usr/bin/perl
use strict;
use Symbol;
use IO::Select;
use IPC::Open3;

my $outlog = shift;
my $errlog = shift;
my $cmd    = shift;
my @args   = @ARGV;

open OUTLOG, ">>$outlog" or die "open $outlog: $!";
open ERRLOG, ">>$errlog" or die "open $errlog: $!";

my ( $rdr, $wtr, $err );
my $pid = open3( $wtr, $rdr, $err = Symbol::gensym, $cmd, @args );

close $wtr;

my $select = IO::Select->new( $rdr, $err );

my $outstr = '';
my $errstr = '';

while ( $select->handles ) {
    for my $handle ( $select->can_read ) {
        my $bytes = sysread $handle, my ($str), 1024;
        die "sysread: $!" unless defined $bytes;
        $select->remove($handle), next unless $bytes;
        if ( fileno($handle) == fileno($rdr) ) {
            print STDOUT $str;
            print OUTLOG $str;
            $outstr .= $str;
        }
        elsif ( fileno($handle) == fileno($err) ) {
            print STDERR $str;
            print ERRLOG $str;
            $errstr .= $str;
        }
    }
}

close $rdr;
close $err;
close OUTLOG;
close ERRLOG;

waitpid $pid, 0;

my $returncode = $? >> 8;
my $signal     = $? & 127;
my $coredump   = $? & 128;

exit unless $returncode;

my $time = localtime;

my $mail = \*STDERR;    # new Mail::Mailer;
print $mail <<END;
Process $cmd @args
returned $returncode (signal $signal, coredump $coredump)
at $time

standard output:
====
$outstr
====
standard error:
====
$errstr
====
END

close $mail;

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In reply to Re: Multiplexing STDOUT and STDERR by Anonymous Monk
in thread Multiplexing STDOUT and STDERR by kilinrax

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