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MINCORE(2) BSD System Calls Manual MINCORE(2)
mincore -- determine residency of memory pages
Standard C Library (libc, -lc)
mincore(void *addr, size_t len, char *vec);
The mincore() system call allows a process to obtain information about whether pages are
core resident. The status of the memory range is returned in the character-per-page array
vec. If the page is resident, the least significant bit of the corresponding character in
vec will be set. Other bits are reserved for additional information which future implemen-
tations may return.
Note that the status of each page may change between the call to mincore() and the return of
the page status information. In order to guarantee that pages will remain in core, the
address range must be locked with mlock(2).
mincore() returns 0 on success, or -1 on failure and sets the variable errno to indicate the
The mincore() call will fail if:
[EFAULT] vec points to an illegal address.
[EINVAL] addr is not a multiple of the system page size.
[EINVAL] len is equal to 0.
[ENOMEM] The address range specified is invalid for the calling process, or one or
more of the pages specified in the range are not mapped.
madvise(2), mlock(2), mprotect(2), msync(2), munmap(2), sysconf(3)
The mincore() function first appeared in 4.4BSD.
BSD June 6, 1999 BSD
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