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MINCORE(2)		  FreeBSD System Calls Manual		    MINCORE(2)

NAME
     mincore --	determine residency of memory pages

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <sys/types.h>
     #include <sys/mman.h>

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

DESCRIPTION
     The mincore() 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.

FreeBSD	10.1			 June 6, 1999			  FreeBSD 10.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY

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