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( #3333=superdoc: print w/replies, xml ) Need Help??
What I want:
  • read unbuffered from a child process ( long running process ).
  • capture childprocess stderr & stdout separately
  • write the childprocess stdout and stderr stream to a logfile and tag lines with a <timestamp> and a tag <INFO> or <ERROR> depending on the source stream.
  • IPC::Run3 almost does what I need.
    #!/usr/bin/perl # timestamp.pl $|++; while(time - $^T<10){ select undef,undef,undef, 0.1; if ( rand()<0.5) { print STDERR time(), " warn\n"; } else { print time(), " info\n"; } } __END__
    use IPC::Run3 qw(run3); my @cmd = ('perl', 'timestamp.pl'); run3 \@cmd, undef, \&out, \&err; sub out { print time(), " out: $_\n"; } sub err { print time(), " err: $_\n"; } __END__ # The problem is that run3 buffers the output. 1215162770 out: 1215162760 info 1215162770 out: 1215162760 info 1215162770 out: 1215162761 info 1215162770 out: 1215162761 info 1215162770 out: 1215162761 info 1215162770 out: 1215162761 info 1215162770 out: 1215162762 info 1215162770 out: 1215162762 info 1215162770 out: 1215162762 info 1215162770 out: 1215162763 info

    print+qq(\L@{[ref\&@]}@{['@'x7^'!#2/"!4']});

    In reply to Re^2: Best practice ipc and Log::Log4perl by codeacrobat
    in thread Best practice ipc and Log::Log4perl by codeacrobat

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