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-rw-r--r--include/os.h15
1 files changed, 13 insertions, 2 deletions
diff --git a/include/os.h b/include/os.h
index 65bcb232cab..d2a4afeca0f 100644
--- a/include/os.h
+++ b/include/os.h
@@ -114,7 +114,7 @@ void os_fd_restore(void);
* os_malloc() - aquires some memory from the underlying os.
*
* @length: Number of bytes to be allocated
- * Return: Pointer to length bytes or NULL on error
+ * Return: Pointer to length bytes or NULL if @length is 0 or on error
*/
void *os_malloc(size_t length);
@@ -123,11 +123,22 @@ void *os_malloc(size_t length);
*
* This returns the memory to the OS.
*
- * @ptr: Pointer to memory block to free
+ * @ptr: Pointer to memory block to free. If this is NULL then this
+ * function does nothing
*/
void os_free(void *ptr);
/**
+ * os_realloc() - reallocate memory
+ *
+ * This follows the semantics of realloc(), so can perform an os_malloc() or
+ * os_free() depending on @ptr and @length.
+ *
+ * Return: Pointer to reallocated memory or NULL if @length is 0
+ */
+void *os_realloc(void *ptr, size_t length);
+
+/**
* os_usleep() - access to the usleep function of the os
*
* @usec: time to sleep in micro seconds