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

       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       The information returned by mincore() may be out of date by the time the system call returns.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 4.4BSD.

Debian                                          January 17, 2003                                      MINCORE(2)