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#!/usr/bin/perl
use strict;
use warnings;
use Fcntl;
use POSIX ":sys_wait_h";
use IPC::Open3;
use IO::Handle;
use IO::Select;
my $out = shift @ARGV;
die unless @ARGV;
open my $fout, ">", $out or die;
my $select = IO::Select->new();
my $alive = 1;
my $pid;
my $code;
sub sigchld
{
my $kid;
do {
$kid = waitpid( -1, WNOHANG );
if ( $kid == $pid ) {
$code = $? >> 8;
$alive = 0
}
} while ( $kid > 0 );
}
$SIG{CHLD} = \&sigchld;
$pid = open3( \*child_in, \*child_out, \*child_err, @ARGV );
close child_in;
sub sethandle
{
my $h = shift;
my $flags = 0;
fcntl ( $h, F_GETFL, $flags )
or die "Couldn't get flags for HANDLE : $!\n";
$flags |= O_NONBLOCK;
fcntl ( $h, F_SETFL, $flags )
or die "Couldn't set flags for HANDLE: $!\n";
$select->add( $h );
}
sethandle( \*child_out );
sethandle( \*child_err );
while ( $alive ) {
foreach my $h ( $select->can_read() ) {
sysread $h, $_, 102400;
print $fout $_;
if ( $h == \*child_err ) {
print "\033[31m$_\033[0m";
} else {
print $_;
}
STDOUT->flush();
}
}
exit $code;
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