table of contents
other sections
MINCORE(2) | System Calls Manual | MINCORE(2) |
NAME¶
mincore
—
determine residency of memory pages
LIBRARY¶
Standard C Library (libc, -lc)SYNOPSIS¶
#include
<sys/mman.h>
int
mincore
(const
void *addr,
size_t len,
char *vec);
DESCRIPTION¶
Themincore
() system call determines whether
each of the pages in the region beginning at
addr and continuing for
len bytes is resident. The status is returned
in the vec array, one character per page.
Each character is either 0 if the page is not resident, or a combination of
the following flags (defined in
<sys/mman.h>
):
MINCORE_INCORE
- Page is in core (resident).
MINCORE_REFERENCED
- Page has been referenced by us.
MINCORE_MODIFIED
- Page has been modified by us.
MINCORE_REFERENCED_OTHER
- Page has been referenced.
MINCORE_MODIFIED_OTHER
- Page has been modified.
MINCORE_SUPER
- Page is part of a "super" page. (only i386 & amd64)
mincore
() may be
out of date by the time the system call returns. The only way to ensure that a
page is resident is to lock it into memory with the
mlock(2) system call.
RETURN VALUES¶
Themincore
() function returns the
value 0 if successful; otherwise the value -1 is returned and
the global variable errno is set to indicate
the error.
ERRORS¶
Themincore
() system call will fail if:
- [
ENOMEM
] - The virtual address range specified by the addr and len arguments is not fully mapped.
- [
EFAULT
] - The vec argument points to an illegal address.
SEE ALSO¶
madvise(2), mlock(2), mprotect(2), msync(2), munmap(2), getpagesize(3)HISTORY¶
Themincore
() system call first appeared in
4.4BSD.January 17, 2003 | Debian |