[libc-commits] [libc] [libc] Add printf error handling (PR #162876)

[Marcell Leleszi via libc-commits]

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@@ -47,9 +49,9 @@ LIBC_INLINE void flockfile(::FILE *f) { ::flockfile(f); }
 
 LIBC_INLINE void funlockfile(::FILE *f) { ::funlockfile(f); }
 
-LIBC_INLINE size_t fwrite_unlocked(const void *ptr, size_t size, size_t nmemb,
-                                   ::FILE *f) {
-  return ::fwrite_unlocked(ptr, size, nmemb, f);
+LIBC_INLINE FileIOResult fwrite_unlocked(const void *ptr, size_t size,
+                                         size_t nmemb, ::FILE *f) {
+  return {::fwrite_unlocked(ptr, size, nmemb, f), errno};
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mleleszi wrote:

Ah, so that's why the overlay tests were failing with libc_errno...but if libc_errno is not set in tests, we won't be able to test this case in overlay mode...should I just not check errno in these tests in overlay mode?

https://github.com/llvm/llvm-project/pull/162876