(split) Correct a typo in readv.2. [JM:00545]

[linuxjm/LDP_man-pages.git] / release / man2 / mremap.2

.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (c) 1996 Tom Bjorkholm <tomb@mydata.se>
.\"
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"

.\" and "executables" are to be interpreted as the output of any
.\" document formatting or typesetting system, including
.\" intermediate and printed output.
.\"
.\" This manual is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public
.\" License along with this manual; if not, write to the Free
.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
.\" USA.
.\"
.\" 1996-04-11 Tom Bjorkholm <tomb@mydata.se>
.\"            First version written (1.3.86)
.\" 1996-04-12 Tom Bjorkholm <tomb@mydata.se>
.\"            Update for Linux 1.3.87 and later
.\" 2005-10-11 mtk: Added NOTES for MREMAP_FIXED; revised EINVAL text.
.\"
.\" Japanese Version Copyright (c) 1997 HANATAKA Shinya
.\"         all rights reserved.
.\" Translated 1997-02-23, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated 2002-11-26, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2005-10-09, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2006-04-16, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.28
.\"
.\"WORD:        virtual memory          ²¾ÁÛ¥á¥â¥ê
.\"WORD:        remap                   ºÆ¥Þ¥Ã¥Ô¥ó¥°
.\"WORD:        argument                °ú¤­¿ô
.\"WORD:        address space           ¥¢¥É¥ì¥¹¶õ´Ö
.\"WORD:        page align              ¥Ú¡¼¥¸¶­³¦
.\"WORD:        linear                  ¥ê¥Ë¥¢
.\"WORD:        process                 ¥×¥í¥»¥¹
.\"WORD:        segment                 ¥»¥°¥á¥ó¥È
.\"WORD:        real memory             ¼Â¥á¥â¥ê
.\"WORD:        segmentation violation  ¥»¥°¥á¥ó¥Æ¡¼¥·¥ç¥ó¿¯³²
.\"WORD:        segmentation fault      ¥»¥°¥á¥ó¥Æ¡¼¥·¥ç¥ó°ãÈ¿
.\"WORD:        scheme                  Êý¼°
.\"WORD:        implement               ¼ÂÁõ
.\"WORD:        lock                    ¥í¥Ã¥¯
.\"
.TH MREMAP 2 2010-06-10 "Linux" "Linux Programmer's Manual"
.SH ̾Á°
mremap \- ²¾ÁÛ¥á¥â¥ê¡¦¥¢¥É¥ì¥¹¤òºÆ¥Þ¥Ã¥Ô¥ó¥°¤¹¤ë
.SH ½ñ¼°
.nf
.BR "#define _GNU_SOURCE" "         /* feature_test_macros(7) »²¾È */"
.br
.B #include <sys/mman.h>
.sp
.BI "void *mremap(void *" old_address ", size_t " old_size ,
.BI "             size_t " new_size ", int " flags ", ... /* void *" new_address " */);"
.fi
.SH ÀâÌÀ
.BR mremap ()
¤Ï´û¸¤Î¥á¥â¥ê¡¦¥Þ¥Ã¥Ô¥ó¥°¤Î³ÈÄ¥ (¤Þ¤¿¤Ï½Ì¾®) ¤ò¹Ô¤¦¡£
Ʊ»þ¤Ë°ÜÆ°¤µ¤ì¤ë¤³¤È¤â¤¢¤ë
(\fIflags\fP °ú¤­¿ô¤ÈÍøÍѲÄǽ¤Ê²¾ÁÛ¥¢¥É¥ì¥¹¶õ´Ö¤Ë¤è¤Ã¤Æ·è¤Þ¤ë)¡£

\fIold_address\fP ¤Ï³ÈÄ¥ (¤Þ¤¿¤Ï½Ì¾®) ¤·¤è¤¦¤È¤¹¤ë²¾ÁÛ¥á¥â¥ê¡¦¥Ö¥í¥Ã¥¯
¤Î¸µ¤Î¥¢¥É¥ì¥¹¤Ç¤¢¤ë¡£\fIold_address\fP ¤Ï¥Ú¡¼¥¸¶­³¦¤Ë¹ç¤Ã¤Æ¤¤¤Ê¤±¤ì¤Ð
¤Ê¤é¤Ê¤¤ÅÀ¤ËÃí°Õ¤¹¤ë¤³¤È¡£\fIold_size\fP ¤Ï¸µ¤Î²¾ÁÛ¥á¥â¥ê¡¦¥Ö¥í¥Ã¥¯¤Î
¥µ¥¤¥º¤Ç¤¢¤ë¡£
\fInew_size\fP ¤ÏÍ׵᤹¤ëÊѹ¹¸å¤Î²¾ÁÛ¥á¥â¥ê¡¦¥Ö¥í¥Ã¥¯¤Î¥µ¥¤¥º¤Ç¤¢¤ë¡£
5 ÈÖÌܤΰú¤­¿ô¤È¤·¤Æ
.I new_address
¤ò»ØÄꤹ¤ë¤³¤È¤¬¤Ç¤­¤ë¡£²¼µ­¤Î
.B MREMAP_FIXED
¤ÎÀâÌÀ¤ò»²¾È¤Î¤³¤È¡£

Linux ¤Ç¤Ï¥á¥â¥ê¤Ï¥Ú¡¼¥¸¤Ëʬ³ä¤µ¤ì¤ë¡£¥æ¡¼¥¶¡¼¡¦¥×¥í¥»¥¹¤Ï (°ì¤Ä¤Þ¤¿¤Ï)
Ê£¿ô¤Î¥ê¥Ë¥¢¤Ê²¾ÁÛ¥á¥â¥ê¥»¥°¥á¥ó¥È¤ò»ý¤Ä¡£
¤½¤ì¤¾¤ì¤Î²¾ÁÛ¥á¥â¥ê¥»¥°¥á¥ó¥È¤Ï°ì¤Ä°Ê¾å¤Î¼Â¥á¥â¥ê¡¦¥Ú¡¼¥¸
¤Ë¥Þ¥Ã¥Ô¥ó¥°¤µ¤ì¤Æ¤¤¤ë (¥Þ¥Ã¥Ô¥ó¥°¾ðÊó¤Ï¥Ú¡¼¥¸¡¦¥Æ¡¼¥Ö¥ë¤Ç´ÉÍý¤µ¤ì¤ë)¡£
²¾ÁÛ¥á¥â¥ê¥»¥°¥á¥ó¥È¤Ë¤Ï¥»¥°¥á¥ó¥ÈËè¤ÎÊݸî (¥¢¥¯¥»¥¹¸¢) ¤¬ÀßÄꤵ¤ì¤Æ¤ª¤ê¡¢
¥á¥â¥ê¤¬ÉÔÀµ¤Ë¥¢¥¯¥»¥¹¤µ¤ì¤¿¾ì¹ç (Î㤨¤ÐÆɤ߹þ¤ßÀìÍѤΥ»¥°¥á¥ó¥È¤Ë
½ñ¤­¹þ¤ó¤À¾ì¹ç)¡¢¥»¥°¥á¥ó¥Æ¡¼¥·¥ç¥ó¿¯³² (segmentation violation) ¤ò
°ú¤­µ¯¤³¤¹¡£¤Þ¤¿¡¢¥»¥°¥á¥ó¥È³°¤Î²¾ÁÛ¥á¥â¥ê¤Ë¥¢¥¯¥»¥¹¤·¤¿¾ì¹ç¤Ë¤â
¥»¥°¥á¥ó¥Æ¡¼¥·¥ç¥ó¿¯³²¤¬È¯À¸¤¹¤ë¡£

.BR mremap ()
¤Ï Linux ¤Î¥Ú¡¼¥¸¡¦¥Æ¡¼¥Ö¥ëÊý¼°¤ò»ÈÍѤ¹¤ë¡£
.BR mremap ()
¤Ï²¾ÁÛ¥¢¥É¥ì¥¹¤È¥á¥â¥ê¡¦¥Ú¡¼¥¸¤Î¥Þ¥Ã¥Ô¥ó¥°¤òÊѹ¹¤¹¤ë¡£¤³¤ì¤ÏÈó¾ï¤Ë¸úΨŪ¤Ê
.BR realloc (3)
¤ò¼ÂÁõ¤¹¤ë¤Î¤Ë»ÈÍѤµ¤ì¤Æ¤¤¤ë¡£

\fIflags\fP ¥Ó¥Ã¥È¥Þ¥¹¥¯°ú¿ô¤Ï 0 ¤Þ¤¿¤Ï°Ê²¼¤Î¥Õ¥é¥°¤ò´Þ¤à:
.TP
.B MREMAP_MAYMOVE
¥Ç¥Õ¥©¥ë¥È¤Ç¤Ï¡¢¸½ºß¤Î°ÌÃ֤˥ޥåԥ󥰤ò³ÈÄ¥¤¹¤ë¤¿¤á¤Î
½½Ê¬¤Ê¶õ¤­¤¬¤Ê¤±¤ì¤Ð
.BR mremap ()
¤Ï¼ºÇÔ¤¹¤ë¡£
¤³¤Î¥Õ¥é¥°¤¬»ØÄꤵ¤ì¤ë¤È¡¢¥«¡¼¥Í¥ë¤ÏɬÍפ¬¤¢¤ì¤Ð¥Þ¥Ã¥Ô¥ó¥°¤ò
¿·¤·¤¤²¾ÁÛ¥¢¥É¥ì¥¹¤ËºÆÇÛÃÖ¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë
¥Þ¥Ã¥Ô¥ó¥°¤¬ºÆÇÛÃÖ¤µ¤ì¤ë¤È¡¢¸Å¤¤¥Þ¥Ã¥Ô¥ó¥°°ÌÃ֤ؤÎÀäÂХݥ¤¥ó¥¿¤Ï
̵¸ú¤Ë¤Ê¤ë (¥Þ¥Ã¥Ô¥ó¥°¤Î³«»Ï¥¢¥É¥ì¥¹¤«¤é¤ÎÁêÂÐ¥ª¥Õ¥»¥Ã¥È¤ÏÍ­¸ú¤Î¤Þ¤Þ¤Ç¤¢¤ë)¡£
.TP
.BR MREMAP_FIXED " (Linux 2.3.31 °Ê¹ß)"
¤³¤Î¥Õ¥é¥°¤Ï
.BR mmap (2)
¤Î
.B MAP_FIXED
¥Õ¥é¥°¤È»÷¤¿¤è¤¦¤ÊÌÜŪ¤ÇÍѤ¤¤é¤ì¤ë¡£
¤³¤Î¥Õ¥é¥°¤¬»ØÄꤵ¤ì¤ë¤È¡¢
.BR mremap ()
¤Ï 5 ÈÖÌܤΰú¤­¿ô
.I "void *new_address"
¤ò¼õ¤±¼è¤ê¡¢¤³¤Î°ú¿ô¤Ï¥Þ¥Ã¥Ô¥ó¥°¤¬°ÜÆ°¤µ¤ì¤ë¤Ù¤­¥¢¥É¥ì¥¹¤ò»ØÄꤹ¤ë¡£
¤³¤Î¥¢¥É¥ì¥¹¤Ï¥Ú¡¼¥¸¶­³¦¤Ë¹ç¤Ã¤Æ¤¤¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
.I new_address
¤È
.I new_size
¤Ç»ØÄꤵ¤ì¤ë¥¢¥É¥ì¥¹ÈϰϤ˲áµî¤Î¥Þ¥Ã¥Ô¥ó¥°¤¬¤¢¤Ã¤¿¾ì¹ç¡¢
¤½¤Î¥Þ¥Ã¥Ô¥ó¥°¤Ï¥¢¥ó¥Þ¥Ã¥×¤µ¤ì¤ë (unmapped)¡£
.B MREMAP_FIXED
¤ò»ØÄꤷ¤¿¾ì¹ç¤Ï¡¢
.B MREMAP_MAYMOVE
¤â»ØÄꤷ¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
.PP
.I old_address
¤È
.I old_size
¤Ç»ØÄꤵ¤ì¤ë¥á¥â¥ê¥»¥°¥á¥ó¥È¤¬
.RB ( mlock (2)
¤äƱÍͤΤâ¤Î¤Ç) ¥í¥Ã¥¯¤µ¤ì¤Æ¤¤¤ë¾ì¹ç¡¢¥»¥°¥á¥ó¥È¤Î¥µ¥¤¥º¤¬ÊѤï¤Ã¤¿¤ê
ºÆÇÛÃÖ¤µ¤ì¤¿¤ê¤·¤¿»þ¤Ë¥í¥Ã¥¯¤â°Ý»ý¤µ¤ì¤ë¡£
¤½¤Î·ë²Ì¡¢¥×¥í¥»¥¹¤Ë¤è¤Ã¤Æ¥í¥Ã¥¯¤µ¤ì¤ë¥á¥â¥ê¤ÎÎ̤ÏÊѲ½¤¹¤ë¡£
.SH ÊÖ¤êÃÍ
À®¸ù¤·¤¿¾ì¹ç¤Ï
.BR mremap ()
¤Ï¿·¤·¤¤²¾ÁÛ¥á¥â¥êÎΰè¤Ø¤Î¥Ý¥¤¥ó¥¿¤òÊÖ¤¹¡£
¥¨¥é¡¼¤Î¾ì¹ç¤Ï
.B MAP_FAILED
(¤¹¤Ê¤ï¤Á \fI(void\ *)\ \-1\fP) ¤¬ÊÖ¤µ¤ì¡¢
\fIerrno\fP ¤¬Å¬ÀÚ¤ËÀßÄꤵ¤ì¤ë¡£
.SH ¥¨¥é¡¼
.TP
.B EAGAIN
¸Æ¤Ó½Ð¤·¸µ¤¬¥í¥Ã¥¯¤µ¤ì¤Æ¤¤¤ë¥á¥â¥ê¥»¥°¥á¥ó¥È¤ò³ÈÄ¥¤·¤è¤¦¤È¤·¤¿¤¬¡¢
.B RLIMIT_MEMLOCK
¥ê¥½¡¼¥¹À©¸Â¤ò±Û¤¨¤º¤Ë¤³¤ì¤ò¹Ô¤¦¤³¤È¤¬¤Ç¤­¤Ê¤¤¡£
.TP
.B EFAULT
¡Ö¥»¥°¥á¥ó¥Æ¡¼¥·¥ç¥ó°ãÈ¿(segmentation fault)¡×
\fIold_address\fP ¤«¤é \fIold_address\fP+\fIold_size\fP ¤Î
ÈϰϤΥ¢¥É¥ì¥¹¤Î¤É¤ì¤«¤¬¤³¤Î¥×¥í¥»¥¹¤Ë¤ª¤¤¤ÆÉÔÀµ¤Ê²¾ÁÛ¥á¥â¥ê¡¦¥¢¥É¥ì¥¹¤Ç¤¢¤ë¡£
¤¿¤È¤¨Í׵ᤷ¤¿¥¢¥É¥ì¥¹¶õ´ÖÁ´ÂΤò´Þ¤à¤è¤¦¤Ê¥Þ¥Ã¥Ô¥ó¥°¤¬¤¢¤Ã¤¿¤È¤·¤Æ¤â¡¢
¤½¤ì¤é¤Î¥Þ¥Ã¥Ô¥ó¥°¤¬°Û¤Ê¤Ã¤¿·¿¤Ê¤é¤Ð
.B EFAULT
¤ò¼õ¤±¼è¤ë¤À¤í¤¦¡£
.TP
.B EINVAL
ÉÔÀµ¤Ê°ú¤­¿ô¤¬Í¿¤¨¤é¤ì¤¿¡£
²ÄǽÀ­¤Î¤¢¤ë¸¶°ø¤Ï°Ê²¼¤ÎÄ̤ê¤Ç¤¢¤ë:
¤¿¤¤¤Æ¤¤¤Ï \fIold_address\fP ¤¬¥Ú¡¼¥¸¶­³¦¤Ë
¹ç¤Ã¤Æ¤Ê¤¤;
.I flags
¤Ë
.B MREMAP_MAYMOVE
¤Þ¤¿¤Ï
.B MREMAP_FIXED
°Ê³°¤ÎÃͤ¬»ØÄꤵ¤ì¤Æ¤¤¤ë;
.I new_size
¤¬¥¼¥í;
.I new_size
¤Þ¤¿¤Ï
.I new_address
¤ÎÃͤ¬ÉÔÀµ;
.I new_address
¤È
.I new_size
¤Ç»ØÄꤵ¤ì¤ë¿·¤·¤¤¥¢¥É¥ì¥¹ÈϰϤ¬
.I old_address
¤È
.I old_size
¤Ç»ØÄꤵ¤ì¤ë¸Å¤¤¥¢¥É¥ì¥¹ÈϰϤȽŤʤäƤ¤¤ë;
.B MREMAP_FIXED
¤¬»ØÄꤵ¤ì¤Æ¤¤¤ë¤¬
.B MREMAP_MAYMOVE
¤¬»ØÄꤵ¤ì¤Æ¤¤¤Ê¤¤¡£
.TP
.B ENOMEM
¸½ºß¤Î²¾ÁÛ¥¢¥É¥ì¥¹¤Ç¤Ï¥á¥â¥êÎΰ褬³ÈÄ¥¤Ç¤­¤º¡¢
.B MREMAP_MAYMOVE
¥Õ¥é¥°¤¬ \fIflags\fP ¤ËÀßÄꤵ¤ì¤Æ¤¤¤Ê¤¤¡£
¤Þ¤¿¤Ï½½Ê¬¤Ê (²¾ÁÛ) ¥á¥â¥ê¤¬Â¸ºß¤·¤Ê¤¤¡£
.SH ½àµò
¤³¤Î¥³¡¼¥ë¤Ï Linux ÆÃÍ­¤Ç¤¢¤ê¡¢°Ü¿¢¤ò°Õ¿Þ¤·¤¿¥×¥í¥°¥é¥à¤Ç
»ÈÍѤ¹¤Ù¤­¤Ç¤Ï¤Ê¤¤¡£
.\" 4.2BSD ¤Ë¤Ï (¼ÂºÝ¤Ë¼ÂÁõ¤µ¤ì¤Æ¤¤¤¿¤ï¤±¤Ç¤Ï¤Ê¤¤¤¬)
.\" Á´¤¯°Û¤Ã¤¿Êý¼° (semantics) ¤Ë¤è¤ë
.\" .BR mremap (2)
.\" ¥³¡¼¥ë¤¬¤¢¤Ã¤¿¡£
.\" FIXME perhaps remove above statement about 4.2BSD.
.SH Ãí°Õ
¥Ð¡¼¥¸¥ç¥ó 2.4 ¤è¤êÁ°¤Î glibc ¤Ç¤Ï¡¢
.B MREMAP_FIXED
¤ÎÄêµÁ¤Ï¸ø³«¤µ¤ì¤Æ¤ª¤é¤º¡¢
.BR mremap ()
¤Î¥×¥í¥È¥¿¥¤¥×¤Ï
.I new_address
°ú¤­¿ô¤ò¼è¤é¤Ê¤«¤Ã¤¿¡£
.SH ´ØÏ¢¹àÌÜ
.BR brk (2),
.BR getpagesize (2),
.BR getrlimit (2),
.BR mlock (2),
.BR mmap (2),
.BR sbrk (2),
.BR realloc (3),
.BR malloc (3)
.P
¥Ú¡¼¥¸Ê¬³ä¤µ¤ì¤¿¥á¥â¥ê¤Ë¤Ä¤¤¤Æ¤â¤Ã¤È¾Ü¤·¤¯ÃΤꤿ¤¤¤Ê¤é¤Ð
¤¢¤Ê¤¿¤Î¹¥¤ß¤Î OS ¤Î¶µ²Ê½ñ¤ò»²¾È¤¹¤ë¤³¤È¡£
(\fIModern Operating Systems\fP by Andrew S. Tannenbaum,
\fIInside Linux\fP by Randolf Bentson,
\fIThe Design of the UNIX Operating System\fP by Maurice J. Bach.)