1 .\" Hey Emacs! This file is -*- nroff -*- source.
3 .\" Copyright (C) 1996 Andries Brouwer <aeb@cwi.nl>
4 .\" and Copyright (C) 2006, 2007 Michael Kerrisk <mtk.manpages@gmail.com>
6 .\" Permission is granted to make and distribute verbatim copies of this
7 .\" manual provided the copyright notice and this permission notice are
8 .\" preserved on all copies.
10 .\" Permission is granted to copy and distribute modified versions of this
11 .\" manual under the conditions for verbatim copying, provided that the
12 .\" entire resulting derived work is distributed under the terms of a
13 .\" permission notice identical to this one.
15 .\" Since the Linux kernel and libraries are constantly changing, this
16 .\" manual page may be incorrect or out-of-date. The author(s) assume no
17 .\" responsibility for errors or omissions, or for damages resulting from
18 .\" the use of the information contained herein. The author(s) may not
19 .\" have taken the same level of care in the production of this manual,
20 .\" which is licensed free of charge, as they might when working
23 .\" Formatted or processed versions of this manual, if unaccompanied by
24 .\" the source, must acknowledge the copyright and authors of this work.
26 .\" Modified 1997-01-31 by Eric S. Raymond <esr@thyrsus.com>
27 .\" Modified 2000-03-25 by Jim Van Zandt <jrv@vanzandt.mv.com>
28 .\" Modified 2001-10-04 by John Levon <moz@compsoc.man.ac.uk>
29 .\" Modified 2003-02-02 by Andi Kleen <ak@muc.de>
30 .\" Modified 2003-05-21 by Michael Kerrisk <mtk.manpages@gmail.com>
31 .\" MAP_LOCKED works from 2.5.37
32 .\" Modified 2004-06-17 by Michael Kerrisk <mtk.manpages@gmail.com>
33 .\" Modified 2004-09-11 by aeb
34 .\" Modified 2004-12-08, from Eric Estievenart <eric.estievenart@free.fr>
35 .\" Modified 2004-12-08, mtk, formatting tidy-ups
36 .\" Modified 2006-12-04, mtk, various parts rewritten
37 .\" 2007-07-10, mtk, Added an example program.
38 .\" 2008-11-18, mtk, document MAP_STACK
40 .\" Japanese Version Copyright (c) 1997-2000 SUTO, Mitsuaki and NAKANO Takeo
41 .\" all rights reserved.
42 .\" Translated 1997-06-26, SUTO, Mitsuaki <suto@av.crl.sony.co.jp>
43 .\" Updated & Modified 1999-03-01, NAKANO Takeo <nakano@apm.seikei.ac.jp>
44 .\" Updated 2000-10-12, Nakano Takeo
45 .\" Updated 2001-08-16, Nakano Takeo
46 .\" Updated 2001-11-11, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
47 .\" Updated 2002-08-13, Akihiro MOTOKI
48 .\" Updated 2003-07- 2, Akihiro MOTOKI
49 .\" Updated 2003-09-14, Akihiro MOTOKI
50 .\" Updated & Modified 2004-12-28, Yuichi SATO <ysato444@yahoo.co.jp>
51 .\" Updated 2005-09-06, Akihiro MOTOKI
52 .\" Updated 2005-10-05, Akihiro MOTOKI
53 .\" Updated 2006-07-23, Akihiro MOTOKI, LDP v2.36
54 .\" Updated 2007-01-07, Akihiro MOTOKI, LDP v2.43
55 .\" Updated 2007-05-04, Akihiro MOTOKI, LDP v2.46
56 .\" Updated 2007-09-03, Akihiro MOTOKI, LDP v2.64
57 .\" Updated 2008-08-05, Akihiro MOTOKI, LDP v3.05
58 .\" Updated 2008-09-02, Akihiro MOTOKI, LDP v3.08
59 .\" Updated 2008-12-24, Akihiro MOTOKI, LDP v3.15
60 .\" Updated 2010-04-18, Akihiro MOTOKI, LDP v3.24
62 .\"WORD file descriptor ¥Õ¥¡¥¤¥ëµ½Ò»Ò
64 .TH MMAP 2 2009-09-26 "Linux" "Linux Programmer's Manual"
66 mmap, munmap \- ¥Õ¥¡¥¤¥ë¤ä¥Ç¥Ð¥¤¥¹¤ò¥á¥â¥ê¤Ë¥Þ¥Ã¥×/¥¢¥ó¥Þ¥Ã¥×¤¹¤ë
69 .B #include <sys/mman.h>
71 .BI "void *mmap(void *" addr ", size_t " length \
72 ", int " prot ", int " flags ,
73 .BI " int " fd ", off_t " offset );
74 .BI "int munmap(void *" addr ", size_t " length );
78 ¤Ï¡¢¿·¤·¤¤¥Þ¥Ã¥Ô¥ó¥°¤ò¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î²¾ÁÛ¥¢¥É¥ì¥¹¶õ´Ö¤ËºîÀ®¤¹¤ë¡£
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89 ¤¬ NULL ¤Ç¤Ê¤¤¾ì¹ç¡¢¥«¡¼¥Í¥ë¤Ï¥Þ¥Ã¥Ô¥ó¥°¤ò¤É¤³¤ËÇÛÃÖ¤¹¤ë¤«¤Î¥Ò¥ó¥È¤È¤·¤Æ
91 ¤ò»ÈÍѤ¹¤ë¡£Linux ¤Ç¤Ï¡¢¥Þ¥Ã¥Ô¥ó¥°¤Ï¤¹¤°¶á¤¯¤Î¥Ú¡¼¥¸¶³¦¤ËºîÀ®¤µ¤ì¤ë¡£
92 .\" Linux 2.6.24 ¤è¤êÁ°¤Ç¤Ï¡¢¥¢¥É¥ì¥¹¤Ï (¥¢¥É¥ì¥¹¤¬Â礤¯¤Ê¤ëÊý¸þ¤Ç)
93 .\" ¤¹¤°¼¡¤Î¥Ú¡¼¥¸¶³¦¤ËÀÚ¤ê¾å¤²¤é¤ì¤Æ¤¤¤¿¡£
94 .\" Linux 2.6.24 °Ê¹ß¤Ç¤Ï¡¢Àڤ겼¤²¤é¤ì¤ë!
95 ¿·¤·¤¤¥Þ¥Ã¥Ô¥ó¥°¤Î¥¢¥É¥ì¥¹¤Ï¡¢¸Æ¤Ó½Ð¤·¤ÎÊÖ¤êÃͤȤ·¤ÆÊÖ¤µ¤ì¤ë¡£
97 ¥Õ¥¡¥¤¥ë¥Þ¥Ã¥Ô¥ó¥°¤ÎÆâÍƤϡ¢
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100 ¤Ç»²¾È¤µ¤ì¤ë¥Õ¥¡¥¤¥ë (¤â¤·¤¯¤Ï¾¤Î¥ª¥Ö¥¸¥§¥¯¥È) ¤Î¥ª¥Õ¥»¥Ã¥È
104 ¥Ð¥¤¥È¤Î¥Ç¡¼¥¿¤Ç½é´ü²½¤µ¤ì¤ë
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110 .I sysconf(_SC_PAGE_SIZE)
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139 (Ê£¿ô¤Ï»ØÄê¤Ç¤¤Ê¤¤) ¤ò
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151 ¤¬¸Æ¤Ð¤ì¤ë¤Þ¤Ç¹Ô¤ï¤ì¤Ê¤¤¤³¤È¤â¤¢¤ë¡£
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155 ¥Þ¥Ã¥Ô¥ó¥°¤ËÂФ¹¤ë¹¹¿·¤ÏƱ¤¸¥Õ¥¡¥¤¥ë¤ò¥Þ¥Ã¥Ô¥ó¥°¤·¤Æ¤¤¤ë¾¤Î¥×¥í¥»¥¹
156 ¤Ë¤Ï¸«¤¨¤º¡¢¹¹¿·¤¬¥Þ¥Ã¥Ô¥ó¥°¸µ¤Î¥Õ¥¡¥¤¥ë¤òÄ̤¸¤ÆÅÁ¤¨¤é¤ì¤ë¤³¤È¤â¤Ê¤¤¡£
158 ¤Î¸Æ¤Ó½Ð¤·¸å¤Ë¥Þ¥Ã¥Ô¥ó¥°¸µ¤Î¥Õ¥¡¥¤¥ë¤ËÂФ·¤Æ¹Ô¤ï¤ì¤¿Êѹ¹¤¬¡¢
159 ¥Þ¥Ã¥×Îΰè¤ËÈ¿±Ç¤µ¤ì¤ë¤«¤É¤¦¤«¤Ïµ¬Äꤵ¤ì¤Æ¤¤¤Ê¤¤¡£
161 ¾åµ¤ÎÆó¤Ä¤Î¥Õ¥é¥°¤Ï POSIX.1-2001 ¤Çµ¬Äꤵ¤ì¤Æ¤¤¤ë¡£
163 ¤µ¤é¤Ë¡¢°Ê²¼¤ÎÃͤΤ¦¤Á 0 ¸Ä°Ê¾å¤ò¥Ó¥Ã¥ÈËè¤ÎÏÀÍýÏ (OR) ¤Ç
165 ¤Ë»ØÄꤹ¤ë¤³¤È¤¬¤Ç¤¤ë¡£
167 .BR MAP_32BIT " (Linux 2.4.20, 2.6 °Ê¹ß)"
168 ¥Þ¥Ã¥Ô¥ó¥°¤ò¥×¥í¥»¥¹¤Î¥¢¥É¥ì¥¹¶õ´Ö¤ÎÀèƬ 2 ¥®¥¬¥Ð¥¤¥È°ÊÆâ¤ËÇÛÃÖ¤¹¤ë¡£
169 ¤³¤Î¥Õ¥é¥°¤¬¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤ë¤Î¤Ï x86-64 ¥¢¡¼¥¥Æ¥¯¥Á¥ã¾å¤Î
170 64 ¥Ó¥Ã¥È¥×¥í¥°¥é¥à¤Î¤ß¤Ç¤¢¤ë¡£
171 ¤³¤Î¥Õ¥é¥°¤¬Äɲ䵤줿¤Î¤Ï¡¢¥¹¥ì¥Ã¥É¤Î¥¹¥¿¥Ã¥¯¤ò¥á¥â¥ê¤ÎÀèƬ 2GB °ÊÆâ¤Î
172 ¤É¤³¤«¤Ë³ä¤êÅö¤Æ¤ë¤³¤È¤Ç¡¢½é´ü¤Î¤¤¤¯¤Ä¤«¤Î 64 ¥Ó¥Ã¥È¥×¥í¥»¥Ã¥µ¤Ë¤ª¤±¤ë
173 ¥³¥ó¥Æ¥¥¹¥È¥¹¥¤¥Ã¥Á¤ÎÀǽÌäÂê¤ò²þÁ±¤¹¤ë¤¿¤á¤Ç¤¢¤ë¡£
174 .\" See http://lwn.net/Articles/294642 "Tangled up in threads", 19 Aug 08
175 ºÇ¶á¤Î x86-64 ¥×¥í¥»¥Ã¥µ¤Ç¤Ï¤³¤ÎÀǽÌäÂê¤Ï¤â¤Ï¤ä¸ºß¤»¤º¡¢
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207 ¤òÁȤ߹ç¤ï¤»¤Æ¤ÎÍøÍѤÏ
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211 ¤³¤Î¥Õ¥é¥°¤Ï̵»ë¤µ¤ì¤ë
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215 ¤Ç¼ºÇÔ¤¹¤ë¤è¤¦¤Ë¥·¥°¥Ê¥ë¤¬ÀßÄꤵ¤ì¤Æ¤¤¤¿¤¬¡¢¤³¤ì¤Ï denial-of-service
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219 ¤³¤Î¥Õ¥é¥°¤Ï̵»ë¤µ¤ì¤ë¡£
220 .\" 1.1.38 ¤ÇƳÆþ¤µ¤ì¡¢1.3.24 ¤Çºï½ü¤µ¤ì¤¿¡£
221 .\" proc_follow_link ¤Ç¥Æ¥¹¥È¤µ¤ì¤ë¥Õ¥é¥°¤Ç¤¢¤ë¡£(¤º¤Ã¤ÈÁ°¤Ï¡¢
222 .\" ¥Þ¥Ã¥×¸µ¤Î¥Õ¥¡¥¤¥ë¤¬¼Â¹Ô²Äǽ¤Ç¤¢¤ë¤³¤È¤òÃΤ餻¤ë¤è¤¦¤Ë¤Ê¤Ã¤Æ¤¤¤¿¡£
223 .\" ¤·¤«¤·¡¢¤½¤Î¾ðÊó¤Ï¼ÂºÝ¤Ë¤Ï¤É¤³¤Ç¤â»È¤ï¤ì¤Ê¤«¤Ã¤¿¡£)
224 .\" Linus ¤Ï MAP_EXECUTABLE ¤Ë´ØÏ¢¤·¤Æ DoS ¤ÎÏäò¤·¤¿¤¬¡¢
225 .\" MAP_DENYWRITE ¤Î¤³¤È¤ò¹Í¤¨¤Æ¤¤¤¿¤Î¤«¤Ê¡©
228 ¸ß´¹À¤Î¤¿¤á¤Î¥Õ¥é¥°¡£Ìµ»ë¤µ¤ì¤ë¡£
229 .\" On some systems, this was required as the opposite of
230 .\" MAP_ANONYMOUS -- mtk, 1 May 2007
234 ¤ò¥¢¥É¥ì¥¹¤Î¥Ò¥ó¥È¤È¤·¤Æ»ÈÍѤ¹¤ë¤Î¤Ç¤Ï¤Ê¤¯¡¢
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254 ¤³¤Î¥ª¥×¥·¥ç¥ó¤ò»ØÄꤹ¤ë¤ÈµÕ¸þ¤¤Ë¥Þ¥Ã¥Ô¥ó¥°¤ò¹Ô¤¦)
256 .BR MAP_HUGETLB " (Linux 2.6.32 °Ê¹ß)"
257 "huge page" ¤ò»È¤Ã¤Æ¥Þ¥Ã¥Ô¥ó¥°¤ò³ä¤êÅö¤Æ¤ë¡£
258 ¾Ü¤·¤¤¾ðÊó¤Ï¡¢¥«¡¼¥Í¥ë¡¦¥½¡¼¥¹¤Î
259 .I Documentation/vm/hugetlbpage.txt
262 .BR MAP_LOCKED " (Linux 2.5.37 °Ê¹ß)"
263 ¥Þ¥Ã¥×¤µ¤ì¤¿Îΰè¤Î¥Ú¡¼¥¸¤ò
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270 .BR MAP_NONBLOCK " (Linux 2.5.46 °Ê¹ß)"
272 ¤ÈÁȤ߹ç¤ï¤»¤¿¾ì¹ç¤Î¤ß°ÕÌ£¤ò»ý¤Ä¡£
273 read-ahead (Á°¤â¤Ã¤ÆÆɤ߹þ¤à¤³¤È) ¤ò¼Â¹Ô¤·¤Ê¤¤¡£
274 ñ¤Ë¡¢¤¹¤Ç¤Ë RAM ¾å¤Ë¸ºß¤¹¤ë¥Ú¡¼¥¸¤ËÂФ·¤Æ
275 ¥Ú¡¼¥¸¥Æ¡¼¥Ö¥ë¥¨¥ó¥È¥ê¤òºîÀ®¤¹¤ë¤À¤±¤Ç¤¢¤ë¡£
276 Linux 2.6.23 °Ê¹ß¤Ç¤Ï¡¢¤³¤Î¥Õ¥é¥°¤Ï
278 ¤Ë²¿¤Î±Æ¶Á¤âÍ¿¤¨¤Ê¤¤¡£
283 ¤òÁȤ߹ç¤ï¤»¤¿¾ì¹ç¤ÎÆ°ºî¤Ï¼ÂÁõ¤·Ä¾¤µ¤ì¤ë¤«¤â¤·¤ì¤Ê¤¤¡£
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294 .I /proc/sys/vm/overcommit_memory
295 ¥Õ¥¡¥¤¥ë¤Ë¤Ä¤¤¤Æ¤ÎµÄÏÀ¤â»²¾È¡£
296 ¥Ð¡¼¥¸¥ç¥ó 2.6 ¤è¤êÁ°¤Î¥«¡¼¥Í¥ë¤Ç¤Ï¡¢¤³¤Î¥Õ¥é¥°¤Ï½ñ¤¹þ¤ß²Äǽ¤Ê
297 ¥×¥é¥¤¥Ù¡¼¥È¡¦¥Þ¥Ã¥Ô¥ó¥°¤Ë¤Ä¤¤¤Æ¤Î¤ß¸ú²Ì¤¬¤¢¤Ã¤¿¡£
299 .BR MAP_POPULATE " (Linux 2.5.46 °Ê¹ß)"
300 ¥Þ¥Ã¥Ô¥ó¥°ÍѤΥڡ¼¥¸¥Æ¡¼¥Ö¥ë¤òÇÛÃÖ (populate) ¤¹¤ë
301 ¥Õ¥¡¥¤¥ë¥Þ¥Ã¥Ô¥ó¥°¤Î¾ì¹ç¤Ë¤Ï¡¢¤³¤ì¤Ë¤è¤ê¥Õ¥¡¥¤¥ë¤¬ÀèÆÉ¤ß (read-ahead)
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317 .BR MAP_STACK " (Linux 2.6.27 °Ê¹ß)"
318 ¥×¥í¥»¥¹¤ä¥¹¥ì¥Ã¥É¤Î¥¹¥¿¥Ã¥¯¤ËŬ¤·¤¿¥¢¥É¥ì¥¹¤Ë¥Þ¥Ã¥Ô¥ó¥°¤ò³ä¤êÅö¤Æ¤ë¡£
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322 ¤¬É¬Íפʾì¹ç¤Ë¡¢glibc ¤Ë¤½¤Î¥µ¥Ý¡¼¥È¤ò¸å¤ÇÆ©²áŪ¤Ë¼ÂÁõ¤Ç¤¤ë¤è¤¦¤Ë¤¹¤ë
324 .\" See http://lwn.net/Articles/294642 "Tangled up in threads", 19 Aug 08
325 .\" commit cd98a04a59e2f94fa64d5bf1e26498d27427d5e7
326 .\" http://thread.gmane.org/gmane.linux.kernel/720412
327 .\" "pthread_create() slow for many threads; also time to revisit 64b
328 .\" context switch optimization?"
330 ¤¤¤¯¤Ä¤«¤Î¥·¥¹¥Æ¥à¤Ç¤Ï¡¢¾åµ°Ê³°¤Ë¥Õ¥é¥°¤È¤·¤Æ
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600 #include <sys/mman.h>
601 #include <sys/stat.h>
607 #define handle_error(msg) \\
608 do { perror(msg); exit(EXIT_FAILURE); } while (0)
611 main(int argc, char *argv[])
616 off_t offset, pa_offset;
620 if (argc < 3 || argc > 4) {
621 fprintf(stderr, "%s file offset [length]\\n", argv[0]);
625 fd = open(argv[1], O_RDONLY);
627 handle_error("open");
629 if (fstat(fd, &sb) == \-1) /* To obtain file size */
630 handle_error("fstat");
632 offset = atoi(argv[2]);
633 pa_offset = offset & ~(sysconf(_SC_PAGE_SIZE) \- 1);
634 /* offset for mmap() must be page aligned */
636 if (offset >= sb.st_size) {
637 fprintf(stderr, "offset is past end of file\\n");
642 length = atoi(argv[3]);
643 if (offset + length > sb.st_size)
644 length = sb.st_size \- offset;
645 /* Can\(aqt display bytes past end of file */
647 } else { /* No length arg ==> display to end of file */
648 length = sb.st_size \- offset;
651 addr = mmap(NULL, length + offset \- pa_offset, PROT_READ,
652 MAP_PRIVATE, fd, pa_offset);
653 if (addr == MAP_FAILED)
654 handle_error("mmap");
656 s = write(STDOUT_FILENO, addr + offset \- pa_offset, length);
659 handle_error("write");
661 fprintf(stderr, "partial write");
677 .BR remap_file_pages (2),
683 B.O. Gallmeister, POSIX.4, O'Reilly, pp. 128-129 and 389-391.
685 .\" »ä¤Î¸å¤Ë¤Ä¤¤¤Æ¸À¤Ã¤Æ¤ß¤Æ: ¥×¥é¥¤¥Ù¡¼¥È¤ÊÆɤ߹þ¤ßÀìÍѤΥޥåԥ󥰤Ï
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