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MINCORE(2) System Calls Manual MINCORE(2)

mincore
determine residency of memory pages

#include <sys/mman.h>
int
mincore(void *addr, size_t len, char *vec);

The mincore() system call allows a process to obtain information about whether pages are core resident. Here the current core residency of the pages is returned in the character array vec, with a value of 1 meaning that the page is in-core.

Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

madvise(2), minherit(2), mlock(2), mprotect(2), msync(2), munmap(2)

The mincore() function first appeared in 4.4BSD.
July 2, 2014 OpenBSD-current