NAME
mincore —
determine residency of memory
pages
LIBRARY
library “libc”
SYNOPSIS
#include
<sys/mman.h>
int
mincore(void
*addr, size_t len,
char *vec);
DESCRIPTION
Themincore()
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 implementations 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).
RETURN VALUES
mincore() returns 0 on success, or -1 on
failure and sets the variable errno to indicate the
error.
ERRORS
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.
SEE ALSO
madvise(2), mlock(2), mprotect(2), msync(2), munmap(2), sysconf(3)
HISTORY
The mincore() function first appeared in
4.4BSD.