Check for availability of MSG_DONTWAIT.

ruby · Apr 12, 2024 · 70f1b72 · 70f1b72
1 parent 94d5dc8
commit 70f1b72
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/ext/socket/basicsocket.c b/ext/socket/basicsocket.c
@@ -745,7 +745,12 @@ bsock_readable_p(VALUE self)
  RB_IO_POINTER(self, fptr);
 
  char buffer[1];
+#ifdef MSG_DONTWAIT
  int result = recv(fptr->fd, buffer, 1, MSG_PEEK | MSG_DONTWAIT);
+#else
+ rb_io_set_nonblock(fptr);
+ int result = recv(fptr->fd, buffer, 1, MSG_PEEK);
+#endif
 
  if (result > 0) {
  return Qtrue;