svcmgr_handler

int svcmgr_handler(struct binder_state *bs,
                   struct binder_txn *txn,
                   struct binder_io *msg,
                   struct binder_io *reply) {
    struct svcinfo *si;
    uint16_t *s;
    unsigned len;
    void *ptr;
    uint32_t strict_policy;
    int allow_isolated;

    if (txn->target != svcmgr_handle)
        return -1;

    strict_policy = bio_get_uint32(msg);
    s = bio_get_string16(msg, &len);
    if ((len != (sizeof(svcmgr_id) / 2)) ||
        memcmp(svcmgr_id, s, sizeof(svcmgr_id))) {
        fprintf(stderr,"invalid id %s\n", str8(s));
        return -1;
    }

    switch(txn->code) {
    ......
    case SVC_MGR_ADD_SERVICE:
        s = bio_get_string16(msg, &len);
        ptr = bio_get_ref(msg);
        allow_isolated = bio_get_uint32(msg) ? 1 : 0;
        if (do_add_service(bs, s, len, ptr, txn->sender_euid, allow_isolated))
            return -1;
        break;
   ......
    }
    bio_put_uint32(reply, 0);
    return 0;
}

do_add_service