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RedHat 9 (Linux i386) - man page for mincore (redhat section 2)

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MINCORE(2)			    Linux Programmer's Manual			       MINCORE(2)

       mincore - get information on whether pages are in core

       #include <unistd.h>
       #include <sys/mman.h>

       int mincore(void *start, size_t length, unsigned char *vec);

       The  mincore  function  requests a vector describing which pages of a file are in core and
       can be read without disk access. The kernel will supply data for  length  bytes	following
       the  start  address.  On  return, the kernel will have filled vec with bytes, of which the
       least significant bit indicates if a page is core resident.

       For mincore to return successfully, start must lie on a page boundary. It is the  caller's
       responsibility  to round up to the nearest page. The length parameter need not be a multi-
       ple of the page size. The vector vec must be  large  enough  to	contain  length/PAGE_SIZE
       bytes.  One may obtain the page size from getpagesize(2).

       On  success,  mincore  returns zero.  On error, -1 is returned, and errno is set appropri-

       EAGAIN kernel is temporarily out of resources

       EINVAL start is not a multiple of the page size, or len has a non-positive value

       EFAULT vec points to an invalid address

       ENOMEM address to address + length contained unmapped memory, or  memory  not  part  of	a

       mincore	should	return	a  bit vector and not a byte vector. As of Linux 2.4.5, it is not
       possible to gain information on the core residency of pages which  are  not  backed  by	a
       file.   In other words, calling mincore on an region returned by an anonymous mmap(2) does
       not work and sets errno to ENOMEM. Unless pages are locked in memory, the contents of  vec
       may be stale by the time they reach userspace.

       mincore does not appear to be part of POSIX or the Single Unix Specification.

       The mincore() function first appeared in 4.4BSD.

       Since Linux 2.3.99pre1 and glibc 2.2.

       getpagesize(2), mmap(2)

Linux 2.4.5				    2001-06-03				       MINCORE(2)
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