First app with WebSockets

[Ivan Enzhaev]

Hello,

I try to run the shorter version this example: https://gist.github.com/nus/564e9e57e4c107faa1a45b8332c265b9

I compile with this command:  emcc -lwebsocket.js -g src/client/main.cpp -o public/main.html
It compiles without problems: 

```
emcc -lwebsocket.js -g src/client/main.cpp -o public/main.html cache:INFO: generating system asset: symbol_lists/f1b6fbba91d4f7c17e21f323c8df509adb00db34.json... (this will be cached in "C:\emsdk\upstream\emscripten\cache\symbol_lists\f1b6fbba91d4f7c17e21f323c8df509adb00db34.json" for subsequent builds)
```

```cpp
#include <emscripten/websocket.h>

#include <iostream>

EM_BOOL onopen(int eventType, const EmscriptenWebSocketOpenEvent *websocketEvent, void *userData) {
    std::cout << "onopen" << std::endl;
    return EM_TRUE;
}

int main()
{
    EmscriptenWebSocketCreateAttributes ws_attrs = {
        "wss://localhost:3000",
        NULL,
        EM_TRUE
    };

    EMSCRIPTEN_WEBSOCKET_T ws = emscripten_websocket_new(&ws_attrs);
    emscripten_websocket_set_onopen_callback(ws, NULL, onopen);
    return 0;
}
```

But I have the error in the browser:

```

main.js:666 Aborted(malloc() called but not included in the build - add '_malloc' to EXPORTED_FUNCTIONS)

main.js:685 Uncaught (in promise)

RuntimeError: Aborted(malloc() called but not included in the build - add '_malloc' to EXPORTED_FUNCTIONS) at abort (main.js:685:11) at _malloc (main.js:379:3) at _emscripten_websocket_set_onopen_callback_on_thread (main.js:1219:45) at __original_main (main.wasm:0x156f) at main (main.wasm:0x2584) at main.js:723:22 at callMain (main.js:4625:15) at doRun (main.js:4675:23) at run (main.js:4690:5) at runCaller (main.js:4610:19)

```

[Ivan Enzhaev]

ebsocket.js to CMakeLists.txt. I try this: SET(EMSCRIPTEN_LINK_FLAGS "-lwebsocket.js") But it didn't help

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[Ivan Enzhaev]

I have solved it!
```cmake
if(CMAKE_SYSTEM_NAME MATCHES Emscripten)
    set(CMAKE_EXECUTABLE_SUFFIX ".html" CACHE INTERNAL "")

    #SET(EMSCRIPTEN_LINK_FLAGS "-lwebsocket.js")
    target_link_options("${EXECUTABLE_NAME}" PRIVATE "-lwebsocket.js")
```

[Ivan Enzhaev]

I have solved it!
```cmake
if(CMAKE_SYSTEM_NAME MATCHES Emscripten)
    set(CMAKE_EXECUTABLE_SUFFIX ".html" CACHE INTERNAL "")

    target_link_options("${EXECUTABLE_NAME}" PRIVATE "-lwebsocket.js")
```

[Sam Clegg]

Regarding the missing malloc export, I uploaded a fix here: https://github.com/emscripten-core/emscripten/pull/22198

cheers,

sam

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