What get_connected() may return?

[el07694]

When a connection has no Exception i want to know what are the possible values of get_connected() method. It return -7, for connection established and ready to use?

What are the possible values of get_connected() method, and what every possible return number means?

Related code: from libshout (from icecast.org) file: /libshout-2.4.5/src/shout.c

int shout_get_connected(shout_t *self)
{
    int rc;

    if (!self)
        return SHOUTERR_INSANE;

    if (self->connection && self->connection->current_message_state == SHOUT_MSGSTATE_SENDING1)
        return SHOUTERR_CONNECTED;
    if (self->connection && self->connection->current_message_state != SHOUT_MSGSTATE_SENDING1) {
        if ((rc = try_connect(self)) == SHOUTERR_SUCCESS)
            return SHOUTERR_CONNECTED;
        return rc;
    }

    return SHOUTERR_UNCONNECTED;
}

file: /libshout2.4.5/include/shout/shout.h.in

#define SHOUTERR_SUCCESS            (  0) /* No error */
#define SHOUTERR_INSANE             ( -1) /* Nonsensical arguments e.g. self being NULL */ 
#define SHOUTERR_NOCONNECT          ( -2) /* Couldn't connect */
#define SHOUTERR_NOLOGIN            ( -3) /* Login failed */
#define SHOUTERR_SOCKET             ( -4) /* Socket error */
#define SHOUTERR_MALLOC             ( -5) /* Out of memory */
#define SHOUTERR_METADATA           ( -6)
#define SHOUTERR_CONNECTED          ( -7) /* Cannot set parameter while connected */
#define SHOUTERR_UNCONNECTED        ( -8) /* Not connected */
#define SHOUTERR_UNSUPPORTED        ( -9) /* This libshout doesn't support the requested option */
#define SHOUTERR_BUSY               (-10) /* Socket is busy */
#define SHOUTERR_NOTLS              (-11) /* TLS requested but not supported by peer */
#define SHOUTERR_TLSBADCERT         (-12) /* TLS connection can not be established because of bad certificate */
#define SHOUTERR_RETRY              (-13) /* Retry last operation. */

Thanks in advance, Chris Pappas