The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.
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 the calloc(), malloc(), [ADV] posix_memalign(), realloc(), or [XSI] strdup() function, 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.
The following sections are informative.
End of informative text.
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