Buffered output/Forked processes

[Nuno Leitao <nuno dot leitao at integralis dot com>]

  Hi,

  I have a Perl script which looks like:

  open( VMSTAT, "vmstat 5|" );
  VMSTAT->autoflush( 1 );
  while( <VMSTAT>) {
     print $_;
  }

  Now, under Linux and other UNIX OS's this works fine, and "print $_" will
print the vmstat output every 5 seconds since the output from vmstat is not
buffered. Under Cygwin however, it seems vmstat will always buffer its
stdout with the undesirable effect that lines come in batches as the output
buffer gets full and is flushed by the Cygwin C libraries.

  Is there a way to go around this without having to patch and recompile
vmstat or other binaries I might want to use in this way ?

  Thanks and best regards,

--Nuno.


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