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document posix_fadvise.

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yamt 2006-02-19 22:27:47 +00:00
parent ea3c7f1cc7
commit 03c44ce523
3 changed files with 114 additions and 4 deletions
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4
distrib/sets/lists/comp/mi
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@ -1,4 +1,4 @@
# $NetBSD: mi,v 1.852 2006/02/14 19:07:30 he Exp $
# $NetBSD: mi,v 1.853 2006/02/19 22:30:20 yamt Exp $
./etc/mtree/set.comp comp-sys-root
./usr/bin/addr2line comp-debug-bin bfd
./usr/bin/ar comp-util-bin bfd
@ -4069,6 +4069,7 @@
./usr/share/man/cat3/pnoutrefresh.0 comp-c-catman .cat
./usr/share/man/cat3/popen.0 comp-c-catman .cat
./usr/share/man/cat3/pos_form_cursor.0 comp-c-catman .cat
./usr/share/man/cat3/posix_fadvise.0 comp-c-catman .cat
./usr/share/man/cat3/posix_openpt.0 comp-c-catman .cat
./usr/share/man/cat3/post_form.0 comp-c-catman .cat
./usr/share/man/cat3/pow.0 comp-c-catman .cat
@ -8021,6 +8022,7 @@
./usr/share/man/man3/pnoutrefresh.3 comp-c-man .man
./usr/share/man/man3/popen.3 comp-c-man .man
./usr/share/man/man3/pos_form_cursor.3 comp-c-man .man
./usr/share/man/man3/posix_fadvise.3 comp-c-man .man
./usr/share/man/man3/posix_openpt.3 comp-c-man .man
./usr/share/man/man3/post_form.3 comp-c-man .man
./usr/share/man/man3/pow.3 comp-c-man .man

6
lib/libc/sys/Makefile.inc
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@ -1,4 +1,4 @@
# $NetBSD: Makefile.inc,v 1.162 2006/01/20 22:03:23 christos Exp $
# $NetBSD: Makefile.inc,v 1.163 2006/02/19 22:27:47 yamt Exp $
# @(#)Makefile.inc 8.3 (Berkeley) 10/24/94
# sys sources
@ -169,8 +169,8 @@ MAN+= accept.2 access.2 acct.2 adjtime.2 bind.2 brk.2 chdir.2 \
madvise.2 mincore.2 minherit.2 mlock.2 mlockall.2 mmap.2 mount.2 \
mprotect.2 msgctl.2 msgget.2 msgrcv.2 msgsnd.2 msync.2 \
munmap.2 nanosleep.2 nfssvc.2 ntp_adjtime.2 open.2 pathconf.2 pipe.2 \
pmc_control.2 poll.2 profil.2 ptrace.2 quotactl.2 rasctl.2 \
read.2 readlink.2 \
pmc_control.2 poll.2 posix_fadvise.2 profil.2 ptrace.2 quotactl.2 \
rasctl.2 read.2 readlink.2 \
reboot.2 recv.2 rename.2 revoke.2 rmdir.2 \
sa_register.2 sa_stacks.2 sa_enable.2 sa_setconcurrency.2 sa_yield.2 \
select.2 semctl.2 \

108
lib/libc/sys/posix_fadvise.2 Normal file
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@ -0,0 +1,108 @@
.\" $NetBSD: posix_fadvise.2,v 1.1 2006/02/19 22:27:48 yamt Exp $
.\"
.\" Copyright (c)2006 YAMAMOTO Takashi,
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" ------------------------------------------------------------
.Dd February 20, 2006
.Dt POSIX_FADVISE 2
.Os
.Sh NAME
.Nm posix_fadvise
.Nd give a hint about a future access pattern of a file
.\" ------------------------------------------------------------
.Sh LIBRARY
.Lb libc
.\" ------------------------------------------------------------
.Sh SYNOPSIS
.In sys/fcntl.h
.Ft int
.Fn posix_fadvise "int fd" "off_t offset" "off_t size" "int hint"
.\" ------------------------------------------------------------
.Sh DESCRIPTION
.Fn posix_fadvise
gives a hint about the application's access pattern to the range
given by
the file descriptor,
.Fa fd ,
and
.Fa offset
and
.Fa size .
If
.Fa size
is zero, it means to the end of file.
.Pp
.Fa hint
should be one of the followings.
.Pp
.Bl -tag -offset indent -width POSIX_FADV_SEQUENTIAL -compact
.It POSIX_FADV_NORMAL
No hint.
(default)
.It POSIX_FADV_RANDOM
Random access.
.It POSIX_FADV_SEQUENTIAL
Sequential access.
(from lower offset to higher offset.)
.It POSIX_FADV_WILLNEED
Will be accessed.
.It POSIX_FADV_DONTNEED
Will not be accessed.
.It POSIX_FADV_NOREUSE
Will be accessed just once.
.El
.Pp
Calling
.Fn posix_fadvise
doesn't alter semantics of operations.
It's only a matter of the performance.
.\" ------------------------------------------------------------
.Sh RETURN VALUES
On success,
.Fn posix_fadvise
returns 0.
Otherwise, it returns an error number.
.\" ------------------------------------------------------------
.Sh SEE ALSO
.Xr errno 2 ,
.Xr madvise 2
.\" ------------------------------------------------------------
.Sh BUGS
.Dv POSIX_FADV_WILLNEED ,
.Dv POSIX_FADV_DONTNEED ,
and
.Dv POSIX_FADV_NOREUSE
are not implemented.
.Pp
For
.Dv POSIX_FADV_NORMAL ,
.Dv POSIX_FADV_RANDOM ,
and
.Dv POSIX_FADV_SEQUENTIAL ,
the current implemetation ignores
.Fa offset
and
.Fa size ,
and applies the hint to the whole file.