skynet error 流程

skynet_error定义位置

skynet-src/skynet_error.c

skynet.send 定义位置

lualib-src/lua-skynet.c

static int
lsend(lua_State *L) {
    return send_message(L, 0, 2);
}

最终调用
skynet-src/skynet_server.c

int
skynet_send(struct skynet_context * context, uint32_t source, uint32_t destination , int type, int session, void * data, size_t sz) {
    if ((sz & MESSAGE_TYPE_MASK) != sz) {
        skynet_error(context, "The message to %x is too large", destination);
        if (type & PTYPE_TAG_DONTCOPY) {
            skynet_free(data);
        }
        return -2;
    }
    _filter_args(context, type, &session, (void **)&data, &sz);

    if (source == 0) {
        source = context->handle;
    }

    if (destination == 0) {
        if (data) {
            skynet_error(context, "Destination address can't be 0");
            skynet_free(data);
            return -1;
        }

        return session;
    }
    if (skynet_harbor_message_isremote(destination)) {
        struct remote_message * rmsg = skynet_malloc(sizeof(*rmsg));
        rmsg->destination.handle = destination;
        rmsg->message = data;
        rmsg->sz = sz & MESSAGE_TYPE_MASK;
        rmsg->type = sz >> MESSAGE_TYPE_SHIFT;
        skynet_harbor_send(rmsg, source, session);
    } else {
        struct skynet_message smsg;
        smsg.source = source;
        smsg.session = session;
        smsg.data = data;
        smsg.sz = sz;

        if (skynet_context_push(destination, &smsg)) {
            skynet_free(data);
            return -1;
        }
    }
    return session;
}