compat.usockets

// Behavioral test: a real event loop iteration, driven by uSockets' own timer.
//
// The struct-layout hazard this package warns about is invisible to a build:
// `us_loop_t` has a different shape under LIBUS_USE_LIBUV, and a consumer that
// disagrees corrupts memory rather than failing to link. So the test allocates
// loop-attached extension memory, writes to it from a timer callback, and reads
// it back afterwards — if the layouts disagreed, that write lands somewhere else.
#include <libusockets.h>

#include <cassert>
#include <cstring>

namespace {

struct LoopExt {
    int ticks;
    int magic;
};

struct TimerExt {
    us_loop_t* loop;
    int budget;
// …