E.g.
– $stream1 is the STDOUT of a child process and $stream2 is the STDERR of the same child process
– $stream1 is one child process and $stream2 is another child process
Is there a possiblility in perl to monitor two or more streams at the same time?
So we loop as long as anything pops-up in any of the streams and we take whatever comes first either in $stream1 or $stream2.
Something like
while (my $line = <$stream1 or $stream2> ) {
#do something with the $line
}
??
Sure there is – it’s Perl, after all – just not with quite such an elegant syntax.
Monitoring several streams boils down to judicious use of the select syscall, and in Perl that means using the four-argument version of select, which wraps this syscall. Many people find this a bit too cumbersome and low-level, so of course there is a module which further wraps the pattern for your convenience.
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