remap_file_pages

Autres langues

Langue: ja

Version: 2004-10-28 (openSuse - 09/10/07)

Section: 2 (Appels système)

̾Á°

remap_file_pages - ÈóÀþ·Á¥Õ¥¡¥¤¥ë¥Þ¥Ã¥Ô¥ó¥°¤òºîÀ®¤¹¤ë¡£

½ñ¼°


#define _GNU_SOURCE

#include <sys/mman.h>



int remap_file_pages(void *start, size_t size, int prot,

                     ssize_t pgoff, int flags);

ÀâÌÀ

remap_file_pages() ¥·¥¹¥Æ¥à¥³¡¼¥ë¤ÏÈóÀþ·Á¤Ê¥Þ¥Ã¥Ô¥ó¥°¡¢ ¤Ä¤Þ¤ê¥Õ¥¡¥¤¥ë¤Î¥Ú¡¼¥¸¤¬¥á¥â¥ê¾å¤ÇϢ³¤·¤Ê¤¤½çÈ֤ǥޥåפµ¤ì¤ë ¥Þ¥Ã¥Ô¥ó¥°¤òºîÀ®¤¹¤ë¤¿¤á¤Ë»È¤ï¤ì¤ë¡£ remap_file_pages() ¤ò»È¤¦Êý¤¬ mmap(2) ¤ò·«¤êÊÖ¤·¤Æ»È¤¦¤è¤êÍ¥¤ì¤Æ¤¤¤ëÅÀ¤Ï¡¢ Á°¼Ô¤ÎÊýË¡¤Ç¤Ï¥«¡¼¥Í¥ë¤¬ VMA (Virtual Memory Area, ²¾ÁÛ¥á¥â¥êÎΰè) ¥Ç¡¼¥¿¹½Â¤ÂΤòÄɲäǺîÀ®¤¹¤ëɬÍפ¬¤Ê¤¤¤³¤È¤Ç¤¢¤ë¡£

ÈóÀþ·Á¥Þ¥Ã¥Ô¥ó¥°¤òºîÀ®¤¹¤ë¤¿¤á¤Ë¤Ï¡¢ °Ê²¼¤Î¤è¤¦¤Ê¥¹¥Æ¥Ã¥×¤ò¼Â¹Ô¤¹¤ë:

1.
mmap(2) ¤ò»È¤¤¡¢¥Þ¥Ã¥Ô¥ó¥°¤òºîÀ®¤¹¤ë (¤³¤Î¥Þ¥Ã¥Ô¥ó¥°¤ÏºÇ½é¤ÏÀþ·Á¤Ç¤¢¤ë)¡£ ¤³¤Î¥Þ¥Ã¥Ô¥ó¥°¤Ï MAP_SHARED ¥Õ¥é¥°¤ò»ØÄꤷ¤ÆºîÀ®¤µ¤ì¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
2.
remap_file_pages() ¤ò 1 ²ó°Ê¾å¸Æ¤Ó½Ð¤·¤Æ¡¢ ¥Þ¥Ã¥Ô¥ó¥°¤Î¥Ú¡¼¥¸¤È¥Õ¥¡¥¤¥ë¤Î¥Ú¡¼¥¸¤ÎÂбþ´Ø·¸¤òºÆ¹½À®¤¹¤ë¡£ ¥Õ¥¡¥¤¥ë¤ÎƱ¤¸¥Ú¡¼¥¸¤ò¥Þ¥Ã¥Ô¥ó¥°Îΰè¤ÎÊ£¿ô¤Î¾ì½ê¤Ë ¥Þ¥Ã¥×¤¹¤ë¤³¤È¤¬²Äǽ¤Ç¤¢¤ë¡£

pgoff ¤È size °ú¤­¿ô¤Ï¡¢¥Þ¥Ã¥Ô¥ó¥°Æâ¤ÇºÆÇÛÃÖ¤µ¤ì¤ë¥Õ¥¡¥¤¥ë¤ÎÎΰè¤ò»ØÄꤹ¤ë¡£ pgoff ¤Ï¥Õ¥¡¥¤¥ë¥ª¥Õ¥»¥Ã¥È¤Ç¤¢¤ê¡¢Ã±°Ì¤Ï¥·¥¹¥Æ¥à¤Î¥Ú¡¼¥¸¥µ¥¤¥º¤Ç¤¢¤ë¡£ size ¤ÏÎΰè¤ÎŤµ¤Ç¤¢¤ê¡¢Ã±°Ì¤Ï¥Ð¥¤¥È¤Ç¤¢¤ë¡£

start °ú¤­¿ô¤Ï 2 ¤Ä¤ÎÌÜŪ¤Ç»È¤ï¤ì¤ë¡£ Âè 1 ¤ÎÌÜŪ¤Ï¡¢¤³¤Î°ú¤­¿ô¤Ë¤è¤Ã¤ÆºÆÊÔÀ®¤·¤¿¤¤¥Ú¡¼¥¸¤Î ¥Þ¥Ã¥Ô¥ó¥°¤ò¼±Ê̤¹¤ë¤³¤È¤Ç¤¢¤ë¡£ ¤è¤Ã¤Æ start ¤Ï mmap(2) ¤Î¸Æ¤Ó½Ð¤·¤Ç²áµî¤Ë¥Þ¥Ã¥×¤µ¤ì¤¿ÎΰèÆâ¤Î¥¢¥É¥ì¥¹¤Ç¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£ Âè 2 ¤ÎÌÜŪ¤Ï¡¢ pgoff ¤È size ¤Ç¼±Ê̤µ¤ì¤ë¥Õ¥¡¥¤¥ë¥Ú¡¼¥¸¤¬ÃÖ¤«¤ì¤ëͽÄê¤Î¥¢¥É¥ì¥¹¤ò¡¢ start ¤Ë¤è¤Ã¤Æ»ØÄꤹ¤ë¤³¤È¤Ç¤¢¤ë¡£

start ¤È size ¤Ë»ØÄꤹ¤ëÃͤϡ¢¥·¥¹¥Æ¥à¤Î¥Ú¡¼¥¸¥µ¥¤¥º¤ÎÇÜ¿ô¤È¤¹¤Ù¤­¤Ç¤¢¤ë¡£ ¤½¤ì°Ê³°¤Î¾ì¹ç¡¢¥«¡¼¥Í¥ë¤Ï¡ÖξÊý¡×¤ÎÃͤò ºÇ¤â¶á¤¤¥Ú¡¼¥¸¥µ¥¤¥º¤ÎÇÜ¿ô¤Ø¡ÖÀڤ겼¤²¤ë¡×¡£

prot °ú¤­¿ô¤Ï 0 ¤Ë»ØÄꤵ¤ì¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£

flags °ú¤­¿ô¤Ï mmap(2) ¤Î¤â¤Î¤ÈƱ¤¸°ÕÌ£¤Ç¤¢¤ë¤¬¡¢ MAP_NONBLOCK °Ê³°¤ÎÁ´¤Æ¤Î¥Õ¥é¥°¤Ï̵»ë¤µ¤ì¤ë¡£

ÊÖ¤êÃÍ

À®¸ù¤·¤¿¾ì¹ç¡¢ remap_file_pages() ¤Ï 0 ¤òÊÖ¤¹¡£ ¥¨¥é¡¼¤Î¾ì¹ç¡¢-1 ¤¬ÊÖ¤µ¤ì¡¢ errno ¤¬Å¬ÀÚ¤ËÀßÄꤵ¤ì¤ë¡£

¥¨¥é¡¼

EINVAL
start ¤¬ MAP_SHARED ¥Õ¥é¥°¤ò»ØÄꤷ¤ÆºîÀ®¤µ¤ì¤¿Í­¸ú¤Ê¥Þ¥Ã¥Ô¥ó¥°¤ò»²¾È¤·¤Æ¤¤¤Ê¤¤¡£
EINVAL
start, size, prot, pgoff ¤Î¤¤¤º¤ì¤«¤¬ÉÔÀµ¤Ç¤¢¤ë¡£

¥Ð¡¼¥¸¥ç¥ó

remap_file_pages() ¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï Linux 2.5.46 ¤ÇÅо줷¤¿¡£

½àµò

remap_file_pages() ¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï Linux ¸ÇÍ­¤Î¤â¤Î¤Ç¤¢¤ë¡£

´ØÏ¢¹àÌÜ

getpagesize(2), mmap(2), mmap2(2), mprotect(2), mremap(2), msync(2), feature_test_macros(7)