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Once smux_simple_open returns OK, the peer program calls smux_register to register the MIB module it will manage. A MIB module can be registered in one of three modes: readOnly, readWrite, or delete. delete mode is used to remove an existing registration.
A return value of OK from smux_register means only that the registration request was queued for the SNMP agent via the SMUX protocol. At some later time, the agent will issue a response PDU.
On failure, smux_error will be set to one of parameterMissing, invalidOperation, congestion, or youLoseBig. foosmuxd takes the appropriate action based on the error code returned.
if (smux_register(tc->t_name, -1, tc->t_access) == NOTOK) {
LIB_ERROR2("smux_register: %s [%s]", smux_error(smux_errno), smux_info);
smux_fd = NOTOK;
return;
}