free

Synopsis

#include <stdlib.h>

void free(void *ptr);

Status

Implemented

Conformance

IEEE Std 1003.1-2017

Description

The free() function shall cause the space pointed to by ptr to be deallocated; that is, made available for further allocation. If ptr is a null pointer, no action shall occur. Otherwise, if the argument does not match a pointer earlier returned by a function in POSIX.1-2017 that allocates memory as if by malloc(), or if the space has been deallocated by a call to free() or realloc(), the behavior is undefined.

Any use of a pointer that refers to freed space results in undefined behavior.

Return value

The free() function shall not return a value.

Errors

No errors are defined.

Tests

Tested

Known bugs

None