Linux Certif

Toute la documentation sur la certification Linux LPI

mlock

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#include <sys/mman.h>



int mlock(const void *addr, size_t len);



int munlock(const void *addr, size_t len);



int mlockall(int flags);



int munlockall(void);

ÀâÌÀ

mlock() ¤È mlockall() ¤Ï¤½¤ì¤¾¤ì¡¢¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î²¾ÁÛ¥¢¥É¥ì¥¹¶õ´Ö¤Î°ìÉô¤Þ¤¿¤ÏÁ´Éô¤ò RAM ¾å¤Ë¥í¥Ã¥¯¤·¡¢¥á¥â¥ê¤¬¥¹¥ï¥Ã¥×¥¨¥ê¥¢¤Ë¥Ú¡¼¥¸¥ó¥°¤µ¤ì¤ë¤Î¤òËɤ°¡£ munlock() ¤È munlockall() ¤ÏµÕ¤ÎÁàºî¤Ç¡¢¤½¤ì¤¾¤ì¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î²¾ÁÛ¥¢¥É¥ì¥¹¶õ´Ö¤Î°ìÉô¤Þ¤¿¤ÏÁ´Éô¤ò ¥í¥Ã¥¯²ò½ü¤¹¤ë¡£¤Ä¤Þ¤ê¡¢»ØÄꤵ¤ì¤¿²¾ÁÛ¥¢¥É¥ì¥¹ÈϰϤΥڡ¼¥¸¤Ï ¥«¡¼¥Í¥ë¥á¥â¥ê¥Þ¥Í¡¼¥¸¥ã¡¼¤«¤éÍ׵ᤵ¤ì¤ì¤Ð¥¹¥ï¥Ã¥×¥¢¥¦¥È¤¹¤ë¤è¤¦¤Ë¤Ê¤ë¡£ ¥á¥â¥ê¤Î¥í¥Ã¥¯¤È¥í¥Ã¥¯²ò½ü¤Ï¥Ú¡¼¥¸Ã±°Ì¤Ç¹Ô¤ï¤ì¤ë¡£

mlock() ¤È munlock()

mlock() ¤Ï addr ¤«¤é»Ï¤Þ¤ëŤµ len ¥Ð¥¤¥È¤Î¥¢¥É¥ì¥¹ÈϰϤΥڡ¼¥¸¤ò¥í¥Ã¥¯¤¹¤ë¡£ ¸Æ¤Ó½Ð¤·¤¬À®¸ù¤·¤¿¾ì¹ç¤Ë¤Ï¡¢ »ØÄꤵ¤ì¤¿¥¢¥É¥ì¥¹ÈϰϤò´Þ¤àÁ´¤Æ¤Î¥Ú¡¼¥¸¤Ï RAM ¤Ë»Ä¤ê³¤±¤ë¤³¤È¤¬Êݾڤµ¤ì¤ë¡£ ¤³¤ì¤é¤Î¥Ú¡¼¥¸¤Ï¸å¤Ç¥í¥Ã¥¯²ò½ü¤µ¤ì¤ë¤Þ¤Ç RAM ¤Ë»Ä¤ê³¤±¤ë¤³¤È¤¬Êݾڤµ¤ì¤ë¡£

mlockall() ¤È munlockall()

mlockall() ¤Ï¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î¥¢¥É¥ì¥¹¶õ´Ö¤Ë¥Þ¥Ã¥×¤µ¤ì¤Æ¤¤¤ëÁ´¤Æ¤Î¥Ú¡¼¥¸¤ò ¥í¥Ã¥¯¤¹¤ë¡£¤³¤ì¤Ë¤Ï¥³¡¼¥É¡¢¥Ç¡¼¥¿¡¢¥¹¥¿¥Ã¥¯¤Î ³Æ¥»¥°¥á¥ó¥È¡¢¶¦Í­¥é¥¤¥Ö¥é¥ê¡¢¥«¡¼¥Í¥ë¤Î¥æ¡¼¥¶¡¼¶õ´Ö¥Ç¡¼¥¿¡¢ ¶¦Í­¥á¥â¥ê¡¢¥á¥â¥ê¡¦¥Þ¥Ã¥×¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¤¬´Þ¤Þ¤ì¤ë¡£ ¥·¥¹¥Æ¥à¡¦¥³¡¼¥ë¤¬À®¸ù¤·¤¿¾ì¹ç¤Ë¤ÏÁ´¤Æ¤Î¥Þ¥Ã¥×¤µ¤ì¤¿¥Ú¡¼¥¸¤Ï RAM ¤Ë »Ä¤ë¤³¤È¤òÊݾڤµ¤ì¤ë¡£ ¤³¤ì¤é¤Î¥Ú¡¼¥¸¤Ï¸å¤Ç¥í¥Ã¥¯²ò½ü¤µ¤ì¤ë¤Þ¤Ç RAM ¤Ë»Ä¤ê³¤±¤ë¤³¤È¤¬Êݾڤµ¤ì¤ë¡£ flags °ú¿ô¤Ï°Ê²¼¤ÎÆâÍƤΰì¤Ä¤Þ¤¿¤ÏÊ£¿ô¤Î¥Ó¥Ã¥È OR ¤«¤é¹½À®¤µ¤ì¤ë:

MCL_CURRENT

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MCL_FUTURE

¾­Íè¡¢¥×¥í¥»¥¹¤Î¥¢¥É¥ì¥¹¶õ´Ö¤Ë¥Þ¥Ã¥×¤µ¤ì¤ëÁ´¤Æ¤Î¥Ú¡¼¥¸¤ò¥í¥Ã¥¯¤¹¤ë¡£ Î㤨¤Ð¡¢¥Ò¡¼¥× (heap) ¤ä¥¹¥¿¥Ã¥¯¤ÎÀ®Ä¹¤Ë¤è¤ê¿·¤·¤¯É¬Íפˤʤä¿¥Ú¡¼¥¸¤À¤±¤Ç ¤Ê¤¯¡¢¿·¤·¤¯¥á¥â¥ê¥Þ¥Ã¥×¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¤ä¶¦Í­¥á¥â¥êÎΰè¤â¥í¥Ã¥¯¤µ¤ì¤ë¡£

MCL_FUTURE ¤¬»ØÄꤵ¤ì¤Æ¤¤¤ë¤È¡¢°Ê¸å¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë (Î㤨¤Ð¡¢ mmap(2), sbrk(2), malloc(3)) ¤Ï¡¢¥í¥Ã¥¯¤¹¤ë¥Ð¥¤¥È¿ô¤¬µö²Ä¤µ¤ì¤¿ºÇÂçÃÍ (²¼µ­»²¾È) ¤òĶ¤¨¤¿¾ì¹ç¤Ë ¼ºÇÔ¤¹¤ë²ÄǽÀ­¤¬¤¢¤ë¡£ ƱÍͤˡ¢¥¹¥¿¥Ã¥¯¤ÎÀ®Ä¹¤â¼ºÇÔ¤¹¤ë²ÄǽÀ­¤¬¤¢¤ë¡£ ¤½¤Î¾ì¹ç¡¢¥«¡¼¥Í¥ë¤Ï¥¹¥¿¥Ã¥¯¤Î³ÈÄ¥¤òµñÈݤ·¡¢ SIGSEGV ¤ò¥×¥í¥»¥¹¤ËÁ÷¤ë¡£

munlockall() ¤Ï¡¢¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î¥¢¥É¥ì¥¹¶õ´Ö¤Ë¥Þ¥Ã¥Ô¥ó¥°¤µ¤ì¤Æ¤¤¤ë Á´¤Æ¤Î¥Ú¡¼¥¸¤ò¥í¥Ã¥¯²ò½ü¤¹¤ë¡£

ÊÖ¤êÃÍ

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ENOMEM

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ENOMEM

(Linux 2.4 °ÊÁ°) ¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤¬ RAM ¤ÎȾʬ°Ê¾å¤ò¥í¥Ã¥¯¤·¤è¤¦¤È¤·¤¿¡£

EPERM

(Linux 2.6.9 °Ê¹ß) ¸Æ¤Ó½Ð¤·¸µ¤ÏÆø¢ (CAP_IPC_LOCK) ¤ò»ý¤¿¤º¡¢¥½¥Õ¥È»ñ¸»À©¸Â RLIMIT_MEMLOCK ¤¬ 0 ¤Ç¤¢¤ë¡£

EPERM

(Linux 2.6.8 °ÊÁ°) ¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤¬ munlockall() ¤ò¸Æ¤Ó½Ð¤¹¤Î¤ËɬÍפÊÆø¢¤ò½êÍ­¤·¤Æ¤¤¤Ê¤«¤Ã¤¿¡£ Linux ¤Ç¤Ï¡¢ CAP_IPC_LOCK ¥±¡¼¥Ñ¥Ó¥ê¥Æ¥£¤¬É¬ÍפǤ¢¤ë¡£

mlock() ¤È munlock() ÍѤȤ·¤Æ:

EINVAL

len ¤¬Éé¤Î¿ô¤Ç¤¢¤ë¡£

EINVAL

(Linux ¤Ç¤Ï¤³¤Î°ÕÌ£¤Ç»È¤ï¤ì¤Ê¤¤) addr ¤¬¥Ú¡¼¥¸¥µ¥¤¥º¤ÎÇÜ¿ô¤Ç¤Ï¤Ê¤¤¡£

ENOMEM

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mlockall() ÍѤȤ·¤Æ:

EINVAL

̤ÃΤΠflags ¤¬»ØÄꤵ¤ì¤¿¡£

munlockall() ÍѤȤ·¤Æ:

EPERM

(Linux 2.6.8 °ÊÁ°) ¸Æ¤Ó½Ð¤·¸µ¤¬¸¢¸Â (CAP_IPC_LOCK) ¤ò»ý¤Ã¤Æ¤¤¤Ê¤¤¡£

½àµò

POSIX.1-2001, SVr4

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Linux ¤Ç¤ÎÃí°Õ

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mmap(2), shmctl(2), setrlimit(2), sysconf(3), capabilities(7)