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MINCORE(2) System Calls Manual MINCORE(2)

mincoreget advise about use of memory

mincore(caddr_t addr, int len, char *vec);

The () 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.

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

The mincore() function first appeared in 4.4BSD.

4.4BSD-Lite2 June 9, 1993 MINCORE(2)