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.\" Copyright (C) 1999 Joseph Samuel Myers.
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" Japanese Version Copyright (c) 1999 HANATAKA Shinya
.\" all rights reserved.
.\" Translated Fri Jun 25 23:32:20 JST 1999
.\" by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\"
.\"WORD: descriptor ǥץ
.\"WORD: offset եå
.\"WORD: seek
.\"
.TH PREAD 2 2008-12-03 "Linux" "Linux Programmer's Manual"
.SH ̾
pread, pwrite \- ꤷեåȤǥեǥץɤ߽
.SH
.B #define _XOPEN_SOURCE 500
.sp
.B #include <unistd.h>
.sp
.BI "ssize_t pread(int " fd ", void *" buf ", size_t " count \
", off_t " offset );
.sp
.BI "ssize_t pwrite(int " fd ", const void *" buf ", size_t " count \
", off_t " offset );
.SH
.BR pread ()
ϡեǥץ
.I fd
(եƬ) եå
.I offset
.I count
ХȤХåե
.I buf
ɤ߹ࡣե롦եåȤѲʤ
.PP
.BR pwrite ()
ϡХåե
.I buf
.I count
ХȤեǥץ
.I fd
Υեå
.I offset
˽ࡣե롦եåȤѲʤ
.PP
.I fd
ǻȤեϥ (seek) ǽǤʤФʤʤ
.SH ֤
硢ɤ߽ԤäХȿ֤ (ϡ
.BR pwrite ()
ξˤϲʤäȤ̣
.BR pread ()
ξˤϥե
ãȤ̣)
顼ξ \-1 ֤졢
.I errno
Υ顼褦ꤵ롣
.SH 顼
.BR pread ()
Ǥϡ
.BR read (2)
.BR lseek (2)
ǵꤵ줿ƤΥ顼ȯǽꡢ
.I error
ˤϥ顼ͤꤵ롣
.BR pwrite ()
Ǥϡ
.BR write (2)
.BR lseek (2)
ǵꤵ줿ƤΥ顼ȯǽꡢ
.I error
ˤϥ顼ͤꤵ롣
.SH С
ƥॳ
.BR pread ()
.BR pwrite ()
Linux ˥С 2.1.60 ɲä줿
i386 ΥƥॳΥȥ 2.1.69 ɲä줿
(ƥॳʤŤͥǤ
.BR lseek (2)
Ȥäߥ졼ޤ)
C 饤֥ˤ륵ݡȤ glibc 2.1 ɲä줿
.SH
POSIX.1-2001.
.SH Ϣ
.BR lseek (2),
.BR read (2),
.BR write (2),
.BR feature_test_macros (7)
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