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-rw-r--r--newlib/libc/stdio/local.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/newlib/libc/stdio/local.h b/newlib/libc/stdio/local.h
index 9ca948d96..187f7d858 100644
--- a/newlib/libc/stdio/local.h
+++ b/newlib/libc/stdio/local.h
@@ -113,7 +113,8 @@ extern _READ_WRITE_RETURN_TYPE _EXFUN(__swrite64,(struct _reent *, void *,
} \
while (0)
-/* Return true iff the given FILE cannot be written now. */
+/* Return true and set errno and stream error flag iff the given FILE
+ cannot be written now. */
#define cantwrite(ptr, fp) \
((((fp)->_flags & __SWR) == 0 || (fp)->_bf._base == NULL) && \