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#pragma once
static void* (*_dlsym)(void*, const char*) = NULL;
static EGLBoolean (*_eglSwapBuffers)(EGLDisplay, EGLSurface) = NULL;
static __eglMustCastToProperFunctionPointerType (*_eglGetProcAddress)(const char*) = NULL;
static void (*_glXSwapBuffers)(Display*, GLXDrawable) = NULL;
static __GLXextFuncPtr (*_glXGetProcAddress)(const GLubyte*) = NULL;
static __GLXextFuncPtr (*_glXGetProcAddressARB)(const GLubyte*) = NULL;
static snd_pcm_sframes_t (*_snd_pcm_writei)(snd_pcm_t*, const void*, snd_pcm_uframes_t) = NULL;
static snd_pcm_sframes_t (*_snd_pcm_writen)(snd_pcm_t*, void**, snd_pcm_uframes_t) = NULL;
static snd_pcm_sframes_t (*_snd_pcm_mmap_writei)(snd_pcm_t*, const void*, snd_pcm_uframes_t) = NULL;
static snd_pcm_sframes_t (*_snd_pcm_mmap_writen)(snd_pcm_t*, void**, snd_pcm_uframes_t) = NULL;
static int (*_clock_gettime)(clockid_t, struct timespec*) = NULL;
static void* store_real_symbol_and_return_fake_symbol(const char*, void*);
static void hook_function(void**, const char*, const bool);
#define HOOK(x) hook_function((void**)&_##x, #x, false)
static uint64_t
get_time_ns(void)
{
struct timespec ts;
HOOK(clock_gettime);
_clock_gettime(CLOCK_MONOTONIC, &ts);
return (uint64_t)ts.tv_sec * (uint64_t)1e9 + (uint64_t)ts.tv_nsec;
}
EGLBoolean
eglSwapBuffers(EGLDisplay dpy, EGLSurface surface)
{
HOOK(eglSwapBuffers);
swap_buffers();
return _eglSwapBuffers(dpy, surface);
}
__eglMustCastToProperFunctionPointerType
eglGetProcAddress(const char *procname)
{
HOOK(eglGetProcAddress);
return (_eglGetProcAddress ? store_real_symbol_and_return_fake_symbol(procname, _eglGetProcAddress(procname)) : NULL);
}
void
glXSwapBuffers(Display *dpy, GLXDrawable drawable)
{
HOOK(glXSwapBuffers);
swap_buffers();
_glXSwapBuffers(dpy, drawable);
}
__GLXextFuncPtr
glXGetProcAddressARB(const GLubyte *procname)
{
HOOK(glXGetProcAddressARB);
return (_glXGetProcAddressARB ? store_real_symbol_and_return_fake_symbol((const char*)procname, _glXGetProcAddressARB(procname)) : NULL);
}
__GLXextFuncPtr
glXGetProcAddress(const GLubyte *procname)
{
HOOK(glXGetProcAddress);
return (_glXGetProcAddress ? store_real_symbol_and_return_fake_symbol((const char*)procname, _glXGetProcAddress(procname)) : NULL);
}
snd_pcm_sframes_t
snd_pcm_writei(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size)
{
HOOK(snd_pcm_writei);
alsa_writei(pcm, buffer, size, __func__);
return _snd_pcm_writei(pcm, buffer, size);
}
snd_pcm_sframes_t
snd_pcm_writen(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size)
{
HOOK(snd_pcm_writen);
FIXME
return _snd_pcm_writen(pcm, bufs, size);
}
snd_pcm_sframes_t
snd_pcm_mmap_writei(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size)
{
HOOK(snd_pcm_mmap_writei);
alsa_writei(pcm, buffer, size, __func__);
return _snd_pcm_mmap_writei(pcm, buffer, size);
}
snd_pcm_sframes_t
snd_pcm_mmap_writen(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size)
{
HOOK(snd_pcm_mmap_writen);
FIXME
return _snd_pcm_mmap_writen(pcm, bufs, size);
}
int
clock_gettime(clockid_t clk_id, struct timespec *tp)
{
HOOK(clock_gettime);
if ((clk_id == CLOCK_MONOTONIC || clk_id == CLOCK_MONOTONIC_RAW)) {
static __thread uint64_t base;
const uint64_t current = get_time_ns();
if (!base) base = current;
const uint64_t fake = base + (current - base) * SPEED_HACK;
tp->tv_sec = fake / (uint64_t)1e9;
tp->tv_nsec = (fake % (uint64_t)1e9);
return 0;
}
return _clock_gettime(clk_id, tp);
}
#define HOOK_DLSYM(x) hook_function((void**)&_##x, #x, true)
void*
dlsym(void *handle, const char *symbol)
{
HOOK_DLSYM(dlsym);
if (!strcmp(symbol, "dlsym"))
return dlsym;
return store_real_symbol_and_return_fake_symbol(symbol, _dlsym(handle, symbol));
}
static void*
store_real_symbol_and_return_fake_symbol(const char *symbol, void *ret)
{
if (!ret || !symbol)
return ret;
if (0) {}
#define SET_IF_NOT_HOOKED(x, y) do { if (!_##x) { _##x = y; WARNX("SET %s to %p", #x, y); } } while (0)
#define FAKE_SYMBOL(x) else if (!strcmp(symbol, #x)) { SET_IF_NOT_HOOKED(x, ret); return x; }
FAKE_SYMBOL(eglSwapBuffers)
FAKE_SYMBOL(eglGetProcAddress)
FAKE_SYMBOL(glXSwapBuffers)
FAKE_SYMBOL(glXGetProcAddressARB)
FAKE_SYMBOL(glXGetProcAddress)
FAKE_SYMBOL(snd_pcm_writei)
FAKE_SYMBOL(snd_pcm_writen)
FAKE_SYMBOL(snd_pcm_mmap_writei)
FAKE_SYMBOL(snd_pcm_mmap_writen)
FAKE_SYMBOL(clock_gettime)
#undef FAKE_SYMBOL
#undef SET_IF_NOT_HOOKED
return ret;
}
static void
hook_function(void **ptr, const char *name, const bool versioned)
{
if (*ptr)
return;
if (versioned) {
const char *versions[] = { "GLIBC_2.0", "GLIBC_2.2.5", NULL };
for (size_t i = 0; !*ptr && versions[i]; ++i)
*ptr = dlvsym(RTLD_NEXT, name, versions[i]);
} else {
HOOK_DLSYM(dlsym);
*ptr = _dlsym(RTLD_NEXT, name);
}
if (!*ptr)
ERRX(EXIT_FAILURE, "HOOK FAIL %s", name);
WARNX("HOOK %s", name);
}
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