fcntl

fcntl

fcntl FILEHANDLE,FUNCTION,SCALAR

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

use Fcntl;

first to get the correct constant definitions. Argument processing and value returned work just like ioctl below. For example:

use Fcntl;
fcntl($filehandle, F_GETFL, $packed_return_buffer)
    or die "can't fcntl F_GETFL: $!";

You don't have to check for defined on the return from fcntl. Like ioctl, it maps a 登录查看完整内容