GHZLangChao/HybridCLRData/LocalIl2CppData-WindowsEditor/il2cpp/external/bdwgc/extra/krait_signal_handler.c

#if defined(__ANDROID__)
#include <signal.h>

#define SIGMAX 64

static void (*wrapped_signal_handlers[SIGMAX]) (int, siginfo_t *, void *);

static void signal_handler(int signum, siginfo_t* siginfo, void* sigcontext)
{
  if (wrapped_signal_handlers[signum])
    wrapped_signal_handlers[signum](signum, siginfo, sigcontext);
}

extern int __real_sigaction(int signum, const struct sigaction *action, struct sigaction *old_action);
__attribute__((used)) int __wrap_sigaction(int signum, const struct sigaction *action, struct sigaction *old_action)
{
  struct sigaction  wrapper_action_data;
  struct sigaction* wrapper_action = NULL;

  if (signum >= SIGMAX)
    return __real_sigaction(signum, action, old_action);

  // patch sig action with our thumb compiled dispatcher
  if (action)
  {
    wrapper_action = &wrapper_action_data;
    memcpy(wrapper_action, action, sizeof(*action));
    wrapper_action->sa_sigaction = signal_handler;

  }

  // install handler (abort on error)
  if (__real_sigaction(signum, wrapper_action, old_action) == -1)
    return -1;

  // hide any previously installed wrapper
  if (old_action && old_action->sa_sigaction == signal_handler)
    old_action->sa_sigaction = wrapped_signal_handlers[signum];

  // add action to dispatch table
  if (action)
    wrapped_signal_handlers[signum] = action->sa_sigaction;

  return 0;
}

#undef SIGMAX
#endif /* __ANDROID__ */