gnutls_system_recv_timeout - API function
int gnutls_system_recv_timeout(gnutls_transport_ptr_t ptr, unsigned int ms);
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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