[compiler-rt][rtsan] intercept accept4 syscall.

Author: devnexen

compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp

@@ -643,6 +643,14 @@ INTERCEPTOR(int, shutdown, int socket, int how) {
   return REAL(shutdown)(socket, how);
 }
 
+#if SANITIZER_INTERCEPT_ACCEPT4
+INTERCEPTOR(int, accept4, int socket, struct sockaddr *address,
+            socklen_t *address_len, int flags) {
+  __rtsan_notify_intercepted_call("accept4");
+  return REAL(accept4)(socket, address, address_len, flags);
+}
+#endif
+
 // I/O Multiplexing
 
 INTERCEPTOR(int, poll, struct pollfd *fds, nfds_t nfds, int timeout) {
@@ -840,6 +848,9 @@ void __rtsan::InitializeInterceptors() {
   INTERCEPT_FUNCTION(sendto);
   INTERCEPT_FUNCTION(shutdown);
   INTERCEPT_FUNCTION(socket);
+#if SANITIZER_INTERCEPT_ACCEPT4
+  INTERCEPT_FUNCTION(accept4);
+#endif
 
   RTSAN_MAYBE_INTERCEPT_SELECT;
   INTERCEPT_FUNCTION(pselect);