| Standards / Extensions | C or C++ | Dependencies |
|---|---|---|
Language Environment |
both | OS/390 V2R10 |
#include <stdlib.h>
int __discarddata(void *addr, size_t size);The __discarddata() function is used to release segments of real storage backing virtual storage. Segments backing virtual storage are released beginning at location addr for a length of size. For AMODE 31, the addr must begin on a page (4K) boundary and size must be a multiple of 4K. For AMODE 64, the addr must begin on a segment (1 MB) boundary and size must be a multiple of 1 MB.
If successful, __discarddata() returns 0.
If unsuccessful, because addr does not begin on a page (4K) boundary or size is not a multiple of 4K, __discarddata() returns -1.
There are no errno values defined.