mincore - determine residency of memory pages
int mincore(caddr_t addr, size_t len, char *vec);
The mincore() function determines the residency of the
memory pages in the address space covered by mappings in the
range [addr, addr + len]. The status is returned as a
character-per-page in the character array referenced by *vec
(which the system assumes to be large enough to encompass
all the pages in the address range). The least significant
bit of each character is set to 1 to indicate that the
referenced page is in primary memory, and to 0 to indicate
that it is not. The settings of other bits in each character
are undefined and may contain other information in future
Because the status of a page can change between the time
mincore() checks and returns the information, returned
information might be outdated. Only locked pages are
guaranteed to remain in memory; see mlock(3C).
Upon successful completion, mincore() returns 0. Otherwise,
-1 is returned and errno is set to indicate the error.
The mincore() function will fail if:
The vec argument points to an illegal address.
The addr argument is not a multiple of the page size
as returned by sysconf(3C), or the len argument has a
value less than or equal to 0.
Addresses in the range [addr, addr + len] are invalid
for the address space of a process or specify one or
more pages which are not mapped.
mmap(2), mlock(3C), sysconf(3C)
Man(1) output converted with