FCNTL
fcntl FILEHANDLE,FUNCTION,SCALAR

Implements the fcntl(2) function. You'll probably have to say

use Fcntl;

first to get the correct function definitions. Argument processing and value return works just like ioctl() below. Note that fcntl() will produce a fatal error if used on a machine that doesn't implement fcntl(2). For example:

use Fcntl; fcntl($filehandle, F_GETLK, $packed_return_buffer);

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