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FLOCK
Section: Linux Programmer's Manual (2)Updated: 11 December 1998
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flock - ¥ª¡¼¥×¥ó¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¤Ë¥í¥Ã¥¯¤ÎŬÍÑ¡¢²ò½ü¤ò¹Ô¤Ê¤¦½ñ¼°
#include <sys/file.h>int flock(int fd, int operation)
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¥ª¡¼¥×¥ó¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¤Ë¥¢¥É¥Ð¥¤¥¶¥ê¡¦¥í¥Ã¥¯(advisory lock)¤ÎŬÍÑ ¤Þ¤¿¤Ï²ò½ü¤ò¹Ô¤¦¡£ ¥Õ¥¡¥¤¥ë¤Ï fd ¤Ç»ØÄꤹ¤ë¡£ ͸ú¤ÊÁàºî(operation)¤Ï°Ê²¼¤ÎÄ̤ê:-
- LOCK_SH
- ¶¦Í¥í¥Ã¥¯¡£ »ØÄꤷ¤¿¥Õ¥¡¥¤¥ë¤ËÂФ·¤Æ¡¢°ì¤Ä°Ê¾å¤Î¥×¥í¥»¥¹¤¬Æ±»þ¤Ë ¶¦Í¥í¥Ã¥¯¤òÊÝ»ý¤¹¤ë¤³¤È¤¬¤Ç¤¤ë¡£
- LOCK_EX
- ÇÓ¾¥í¥Ã¥¯¡£ »ØÄꤷ¤¿¥Õ¥¡¥¤¥ë¤ËÂФ·¤Æ¡¢¤¿¤À°ì¤Ä¤Î¥×¥í¥»¥¹¤À¤±¤¬ Ʊ»þ¤ËÇÓ¾¥í¥Ã¥¯¤òÊÝ»ý¤¹¤ë¤³¤È¤¬¤Ç¤¤ë¡£
- LOCK_UN
- ¥¢¥ó¥í¥Ã¥¯¡£
- LOCK_NB
-
¥í¥Ã¥¯¤¹¤ë¤È¤¤Ë¥Ö¥í¥Ã¥¯¤·¤Ê¤¤¡£Â¾¤ÎÁàºî(operation)¤È¤¤¤Ã¤·¤ç¤Ë(
or
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¥Õ¥¡¥¤¥ë(¤¹¤Ê¤ï¤Á inode)¤Ï¥í¥Ã¥¯¤µ¤ì¤ë¤¬¡¢ ¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤¬¥í¥Ã¥¯¤µ¤ì¤ë¤ï¤±¤Ç¤Ï ¤Ê¤¤¡£ ¤½¤ì¤Ç¡¢ dup(2) ¤ä fork(2) ¤Ë¤è¤Ã¤ÆÊ£¿ô¤Î¥í¥Ã¥¯¤¬ºî¤ê¤À¤µ¤ì¤ë¤³¤È¤Ï¤Ê¤¤¡£
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À®¸ù¤·¤¿¤é¥¼¥í¤¬ÊÖ¤µ¤ì¤ë¡£¥¨¥é¡¼¤Î»þ¤Ï¡¢-1 ¤¬ÊÖ¤µ¤ì¡¢ errno ¤ËŬÀÚ¤ÊÃͤ¬ÀßÄꤵ¤ì¤ë¡£¥¨¥é¡¼
- EWOULDBLOCK
- »ØÄꤷ¤¿¥Õ¥¡¥¤¥ë¤¬¥í¥Ã¥¯¤µ¤ì¤Æ¤ª¤ê¡¢ LOCK_NB ¥Õ¥é¥°¤¬»ØÄꤵ¤ì¤Æ¤¤¤ë¡£
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4.4BSD ( flock(2) ¥³¡¼¥ë¤Ï 4.2BSD ¤ÇºÇ½é¤Ë ¸½¤ï¤ì¤¿)¡£Ãí°Õ
flock(2) ¤Ï NFS ¾å¤Î¥Õ¥¡¥¤¥ë¤Î¥í¥Ã¥¯¤ò¤·¤Ê¤¤¡£Âå¤ê¤Ë fcntl(2) ¤ò»ÈÍѤ¹¤ë¤³¤È¡£¤³¤ì¤Ë¤è¤ê¡¢½½Ê¬¤Ë¿·¤·¤¤¥Ð¡¼¥¸¥ç¥ó¤Î Linux ¤È¡¢¥í¥Ã¥¯µ¡Ç½¤ò ¥µ¥Ý¡¼¥È¤·¤¿ NFS ¥µ¡¼¥Ð¤ò»ÈÍѤ¹¤ë¤³¤È¤Ë¤è¤ê¡¢NFS ¾å¤Ç¥í¥Ã¥¯¤¬¤Ç¤¤ë¡£´ØÏ¢¹àÌÜ
open(2), close(2), dup(2), execve(2), fcntl(2), fork(2), lockf(3). /usr/src/linux/Documentation ¤Ë¤¢¤ë locks.txt ¤È mandatory.txt ¤â»²¾È¤¹¤ë¤³¤È¡£