Makes available for reallocation the area allocated by a previous
calloc, malloc, or realloc call.
Format
#include <stdlib.h>
void free (void *ptr);
Argument
- ptr
- The address returned by a previous call to malloc, calloc, or
realloc. If ptr is a NULL pointer, no action occurs.
Description
The ANSI C standard defines free as not returning a value;
therefore, the function prototype for free is declared with a return
type of void. However, since a free can fail, and since previous
versions of the DEC C RTL have declared
free to return an int, the implementation of free does return 0 on
success and -1 on failure.
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