minix/lib/libc/sys/mincore.2
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

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Groff

.\" $NetBSD: mincore.2,v 1.19 2004/05/13 10:20:58 wiz Exp $
.\"
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.\" @(#)mincore.2 8.1 (Berkeley) 6/9/93
.\"
.Dd June 6, 1999
.Dt MINCORE 2
.Os
.Sh NAME
.Nm mincore
.Nd determine residency of memory pages
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/mman.h
.Ft int
.Fn mincore "void *addr" "size_t len" "char *vec"
.Sh DESCRIPTION
The
.Fn 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
.Ar vec .
If the page is resident, the least significant bit of the corresponding
character in
.Ar vec
will be set.
Other bits are reserved for additional information
which future implementations may return.
.Pp
Note that the status of each page may change between the call to
.Fn 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
.Xr mlock 2 .
.Sh RETURN VALUES
.Fn mincore
returns 0 on success, or \-1 on failure and sets the variable
.Va errno
to indicate the error.
.Sh ERRORS
The
.Fn mincore
call will fail if:
.Bl -tag -width Er
.It Bq Er EFAULT
.Ar vec
points to an illegal address.
.It Bq Er EINVAL
.Ar addr
is not a multiple of the system page size.
.It Bq Er EINVAL
.Ar len
is equal to 0.
.It Bq Er 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.
.El
.Sh SEE ALSO
.Xr madvise 2 ,
.Xr mlock 2 ,
.Xr mprotect 2 ,
.Xr msync 2 ,
.Xr munmap 2 ,
.Xr sysconf 3
.Sh HISTORY
The
.Fn mincore
function first appeared in
.Bx 4.4 .