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$flags = fcntl( FH, F_GETFL, 0 );
$rc = fcntl( FH, F_SETFL, $flags );

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$flags = fcntl( FH, F_GETFL, 0 );
print "current flags -> $flags\n";  ## now we've got trouble
$rc = fcntl( FH, F_SETFL, $flags );