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LEARN ABOUT FREEBSD

mincore

MINCORE(2)						      BSD 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

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     The information returned by mincore() may be out of date by the time the system call returns.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

BSD
								 January 17, 2003							       BSD

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