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FSYNC

Section: Linux Programmer's Manual (2)
Updated: 2001-04-18
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fsync - ¥á¥â¥ê¾å¤Ë¤¢¤ë¥Õ¥¡¥¤¥ë¤ÎÆâÍÆ¤ò¥Ç¥£¥¹¥¯¾å¤Î¤â¤Î¤ÈƱ´ü¤µ¤»¤ë  

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#include <unistd.h>

int fsync(int fd);

int fdatasync(int fd);  

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fsync ¤Ï¥Õ¥¡¥¤¥ë¤Î¥á¥â¥ê¾å¤ÎÉôʬ¤ÎÁ´¤Æ¤ò¥Ç¥£¥¹¥¯¤Ë¥³¥Ô¡¼¤·¡¢¤½¤ì¤éÁ´¤Æ¤¬ °ÂÄꤷ¤¿µ­²±ÇÞÂΤËÃÖ¤«¤ì¤¿¤È¥Ç¥Ð¥¤¥¹¤¬Êó¹ð¤¹¤ë¤Þ¤ÇÂԤġ£ ¤Þ¤¿¥á¥¿¥Ç¡¼¥¿¾õÂÖ(stat)¾ðÊó¤ò¹¹¿·¤¹¤ë¡£¤³¤ì¤Ï¤½¤Î¥Õ¥¡¥¤¥ë¤¬Â¸ºß¤· ¤Æ¤¤¤ë¥Ç¥£¥ì¥¯¥È¥ê¤Î¥¨¥ó¥È¥ê¤¬¥Ç¥£¥¹¥¯¤Ø½ñ¤­¹þ¤Þ¤ì¤¿¤³¤È¤òÊݾڤ¹¤ë ¤ï¤±¤Ç¤Ï¤Ê¤¤¡£ Êݾڤ¹¤ë¤¿¤á¤Ë¤ÏÌÀ¼¨Åª¤Ë¤½¤Î¥Ç¥£¥ì¥¯¥È¥ê¤Î¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼ ¤ËÂФ·¤Æ¤â fsync ¤¹¤ëɬÍפ¬¤¢¤ë¡£

fdatasync ¤Ï fsync ¤È¤Û¤È¤ó¤ÉƱ¤¸¤Ç¤¢¤ë¤¬¡¢¥æ¡¼¥¶¥Ç¡¼¥¿¤Î¤ß¤ò½ñ¤­½Ð¤·¡¢mtime ¤ä atime ¤Î ¤è¤¦¤Ê¥á¥¿¥Ç¡¼¥¿¤ËÂФ·¤ÆÆ±´ü¤ò¤·¤Ê¤¤ÅÀ¤¬°Û¤Ã¤Æ¤¤¤ë¡£

 

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EBADF
fd ¤¬½ñ¤­¹þ¤ß¤Î¤¿¤á¤Ë¥ª¡¼¥×¥ó¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤Ç¤Ê¤¤¡£
EROFS, EINVAL
fd ¤¬Æ±´üÁàºî¤ò¥µ¥Ý¡¼¥È¤·¤Æ¤Ê¤¤ÆÃ¼ì¤Ê¥Õ¥¡¥¤¥ë¤ò»²¾È¤·¤Æ¤¤¤ë¡£
EIO
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¥Ï¡¼¥É¥Ç¥£¥¹¥¯¤Î½ñ¤­¹þ¤ß¥­¥ã¥Ã¥·¥å¤¬Í­¸ú¤Ë¤Ê¤Ã¤Æ¤¤¤ë¾ì¹ç¡¢ fsync/fdatasync ¤«¤éÌá¤Ã¤Æ¤­¤¿¤È¤·¤Æ¤â¡¢¼ÂºÝ¤Ë¤Ï±Êµ×Ū¤Êµ­²±ÇÞÂΤËÃÖ¤«¤ì¤Æ¤¤¤Ê¤¤ ¤«¤â¤ì¤Ê¤¤¡£

ext2 ¥Õ¥¡¥¤¥ë¡¦¥·¥¹¥Æ¥à¤¬ sync ¥ª¥×¥·¥ç¥ó¤Ä¤­¤Ç¥Þ¥¦¥ó¥È¤µ¤ì¤Æ¤¤¤ë¾ì¹ç¡¢ fsync ¤Ç¥Ç¥£¥ì¥¯¥È¥ê¡¦¥¨¥ó¥È¥ê¤â°ÅÌۤΤ¦¤Á¤ËƱ´ü¤¹¤ë¡£

2.4 ¤è¤êÁ°¤Î¥«¡¼¥Í¥ë¤Ç¤ÏµðÂç¤Ê¥Õ¥¡¥¤¥ë¤Ë fsync ¤ò»ÈÍѤ¹¤ë¤³¤È¤Ï¸úΨ¤¬°­¤¤¾ì¹ç¤¬¤¢¤ë¡£ Ê̤ÎÊýË¡¤È¤·¤Æ open(2) ¤ÎºÝ¤Ë O_SYNC ¥Õ¥é¥°¤ò»ÈÍѤ¹¤ë¤Î¤¬Îɤ¤¤«¤â¤·¤ì¤Ê¤¤¡£  

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POSIX.1b (°ÊÁ°¤Î POSIX.4)  

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bdflush(2), open(2), sync(2), mount(8), update(8), sync(8)


 

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