This function has the similar semantics with recv(). The only
difference is that it accepts a GnuTLS session, and uses different
In the special case that a server requests a renegotiation, the
client may receive an error code of GNUTLS_E_REHANDSHAKE. This
message may be simply ignored, replied with an alert
GNUTLS_A_NO_RENEGOTIATION, or replied with a new handshake,
depending on the client's will.
If EINTR is returned by the internal push function (the default
is recv()) then GNUTLS_E_INTERRUPTED will be returned. If
GNUTLS_E_INTERRUPTED or GNUTLS_E_AGAIN is returned, you must
call this function again to get the data. See also
A server may also receive GNUTLS_E_REHANDSHAKE when a client has
initiated a handshake. In that case the server can only initiate a
handshake or terminate the connection.
the number of bytes received and zero on EOF. A negative
error code is returned in case of an error. The number of bytes
received might be less than sizeofdata.