snmpv2_opts_t
snmpv2_opts_t *ctx;
snmpv2_opts_t *v2 = ctx;
snmpv2_opts_t *v2 = ctx;
snmpv2_opts_t *s1 = ctx1, *s2 = ctx2;
snmpv2_opts_t *s = ctx;
snmpv2_opts_t *snmpv2 = ctx;