diff options
| -rw-r--r-- | malloc/malloc.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c index 6640385282..0cd3ba78ca 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -346,10 +346,13 @@ __malloc_assert (const char *assertion, const char *file, unsigned int line, #define REVEAL_PTR(ptr) PROTECT_PTR (&ptr, ptr) /* - REALLOC_ZERO_BYTES_FREES should be set if a call to - realloc with zero bytes should be the same as a call to free. - This is required by the C standard. Otherwise, since this malloc - returns a unique pointer for malloc(0), so does realloc(p, 0). + REALLOC_ZERO_BYTES_FREES controls the behavior of realloc (p, 0) + when p is nonnull. If nonzero, realloc (p, 0) should free p and + return NULL. Otherwise, realloc (p, 0) should do the equivalent + of freeing p and returning what malloc (0) would return. + + ISO C17 says the behavior is implementation-defined here; glibc + follows historical practice and defines it to be nonzero. */ #ifndef REALLOC_ZERO_BYTES_FREES |