Returns true if the socket is positioned at the out-of-band mark (also known as the urgent data mark), false otherwise. Use right after reading from the socket.
Not available directly, one has to import the function from the IO::Socket extension
use IO::Socket 'sockatmark';Even this doesn't guarantee that sockatmark() really is available, though, because sockatmark() is a relatively recent addition to the family of socket functions. If it is unavailable, attempt to use it will fail
IO::Socket::atmark not implemented on this architecture ...See also IO::Socket.