Wait for data to be received from the provided socket ( ptr )
within a timeout period in milliseconds, using select() on the
provided ptr .
This function is provided as a helper for constructing custom
callbacks for gnutls_transport_set_pull_timeout_function(), which
can be used if you rely on socket file descriptors.
Returns -1 on error, 0 on timeout, positive value if data are
available for reading.
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gnutls 3.7.2 gnutls_system_recv_timeout(3)