is a gnutls_session_t type.
const char * priorities
is a string describing priorities
const char ** err_pos
In case of an error this will have the position in the
string the error occurred
Sets the priorities to use on the ciphers, key exchange methods, macs
and compression methods. This function avoids keeping a priority
cache and is used to directly set string priorities to a TLS session.
For documentation check the gnutls_priority_init().
To simply use a reasonable default, consider using
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gnutls 3.5.9 gnutls_priority_set_direct(3)