extension: free will perserve errno

Signed-off-by: Mattias Andrée <maandree@member.fsf.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/malloc.c b/src/malloc.c
index 6d1f220..9b45607 100644
--- a/src/malloc.c
+++ b/src/malloc.c
@@ -254,6 +254,8 @@ void* realloc(void* ptr, size_t size)
 
 /**
  * Free a memory allocation.
+ *  
+ * As a slibc extension, `errno` is guaranteed not to be set.
  * 
  * @etymology  (Free) allocated memory.
  * 
@@ -277,6 +279,8 @@ void free(void* ptr)
  * This function uses variadic arguments because there
  * there are multiple conflicting specifications for `cfree`.
  * 
+ * As a slibc extension, `errno` is guaranteed not to be set.
+ * 
  * @param  ptr  Pointer to the beginning of the memory allocation.
  *              The process may crash if it does not point to the
  *              beginning of a memory allocation on the heap.