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Manual Pages  — MINCORE

NAME

mincore – determine residency of memory pages

CONTENTS

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <sys/mman.h>

int
mincore(const void *addr, size_t len, char *vec);

DESCRIPTION

The mincore() 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)

The information returned by mincore() may be out of date by the time the system call returns.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

The mincore 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

The mincore() 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

The mincore() system call first appeared in BSD 4.4 .

MINCORE (2) January 17, 2003

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