Add an assert for an implicit assumption on struct layout

jiahao · Jul 15, 2015 · a96afe2 · a96afe2
1 parent 7541908
commit a96afe2
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/jl_uv.c b/src/jl_uv.c
@@ -351,6 +351,9 @@ DLLEXPORT void jl_uv_writecb(uv_write_t *req, int status)
 static void jl_write(uv_stream_t *stream, const char *str, size_t n)
 {
  assert(stream);
+ _Static_assert(offsetof(uv_stream_t,type) == offsetof(ios_t,bm) &&
+ sizeof(((uv_stream_t*)0)->type) == sizeof(((ios_t*)0)->bm),
+ "UV and ios layout mismatch");
 
  uv_file fd = 0;