PIVOT_ROOT

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_syscall2(int,pivot_root,const char *,new_root,const char *,put_old)

int pivot_root(const char *new_root, const char *put_old);  

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pivot_root ¤Îŵ·¿Åª¤ÊÍøÍÑË¡¤Ï¡¢¥·¥¹¥Æ¥à¤Îµ¯Æ°Ãæ¤Ë¥·¥¹¥Æ¥à¤¬°ì»þŪ¤Ê root ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à (Î㤨¤Ð initrd) ¤ò¥Þ¥¦¥ó¥È¤·¡¢¤³¤ì¤Ë³¤¤¤ÆËÜÅö¤Î root ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤ò¥Þ¥¦¥ó¥È¤·¡¢ ¸å¼Ô¤òɬÍפÊÁ´¤Æ¤Î¥×¥í¥»¥¹¡¦¥¹¥ì¥Ã¥É¤Î ¥«¥ì¥ó¥È root ¤ËÊѹ¹¤¹¤ë¤è¤¦¤Ê¾ì¹ç¤Ç¤¢¤ë¡£

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¾åµ­¤ÎÃÊÍî¤Ï¡¢¾­Íè pivot_root ¤¬Êѹ¹¤µ¤ì¤ë¤«¤âÃΤì¤Ê¤¤¤³¤È¤ò´Õ¤ß¤Æ¡¢¤ï¤¶¤ÈÛ£Ëæ¤Ë½ñ¤¤¤Æ¤¢¤ë¡£ ËÜ¥Ú¡¼¥¸¤òµ­½Ò¤·¤Æ¤¤¤ë»þÅÀ¤Ç¤Ï¡¢ pivot_root ¤Ï¸Å¤¤ root ¥Ç¥£¥ì¥¯¥È¥ê¤òÍѤ¤¤Æ¤¤¤ëÁ´¤Æ¤Î¥×¥í¥»¥¹¡¦¥¹¥ì¥Ã¥É¤Î root ¤È cwd ¤ò new_root ¤ËÊѹ¹¤¹¤ë¡£¤³¤ì¤Ï¥«¡¼¥Í¥ë¤Î¥¹¥ì¥Ã¥É¤¬¸Å¤¤ root ¥Ç¥£¥ì¥¯¥È¥ê¤ò busy ¾õÂ֤ˤ·¤Ê¤¤¤¿¤á¤ËɬÍפǤ¢¤ë¡£¤³¤ì¤é¤Î¥¹¥ì¥Ã¥É¤¬ ¸Å¤¤¥Ç¥£¥ì¥¯¥È¥ê¤ò root / cwd ¤È¤·¤Æ¤¤¤ë¤È¡¢¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Ë °ìÀÚ¥¢¥¯¥»¥¹¤·¤Ê¤¤¾ì¹ç¤Ç¤â¸Å¤¤ root ¤¬ busy ¤Ë¤Ê¤Ã¤Æ¤·¤Þ¤¦¤«¤é¤Ç¤¢¤ë¡£ ¾­Íè¤Ï¡¢¥«¡¼¥Í¥ë¥¹¥ì¥Ã¥É¤¬¤¢¤é¤æ¤ë¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Ø¤Î¥¢¥¯¥»¥¹¤ò ÌÀ¼¨Åª¤ËÊü´þ¤¹¤ë¥á¥«¥Ë¥º¥à¤¬¤Ç¤­¡¢¤³¤Î¤Ç¤·¤ã¤Ð¤ê¤Êµ¡Ç½¤Ï pivot_root ¤«¤éºï½ü¤µ¤ì¤ë¤«¤â¤·¤ì¤Ê¤¤¡£

¤³¤ì¤Ï¥«¥ì¥ó¥È¥×¥í¥»¥¹¤Ë¤Ä¤¤¤Æ¤âÅö¤Æ¤Ï¤Þ¤ë¤³¤È¤ËÃí°Õ¡£ pivot_root ¤¬¥«¥ì¥ó¥È¥×¥í¥»¥¹¤Î cwd ¤Ë±Æ¶Á¤¹¤ë¤«¤É¤¦¤«¤Ï¤ï¤«¤é¤Ê¤¤¡£ ¤·¤¿¤¬¤Ã¤Æ pivot_root ¤Îľ¸å¤Ë chdir(/) ¤ò¸Æ¤Ó½Ð¤¹¤È¤è¤¤¡£

new_root ¤ª¤è¤Ó put_old ¤Ë¤Ï°Ê²¼¤ÎÀ©¸Â¤¬¤¢¤ë:

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new_root ¤È put_old ¤Ï¸½ºß¤Î root ¤ÈƱ¤¸¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Ë¤¢¤Ã¤Æ¤Ï¤Ê¤é¤Ê¤¤¡£

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put_old ¤Ï new_root °Ê²¼¤Ë¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£¤¹¤Ê¤ï¤Á put_old ¤òº¹¤¹Ê¸»úÎó¤Ë 1 ¸Ä°Ê¾å¤Î ../ ¤òÉÕ¤±¤ë¤³¤È¤Ë¤è¤Ã¤Æ new_root ¤ÈƱ¤¸¥Ç¥£¥ì¥¯¥È¥ê¤¬ÆÀ¤é¤ì¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£

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¾¤Î¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤¬ put_old ¤Ë¥Þ¥¦¥ó¥È¤µ¤ì¤Æ¤¤¤Æ¤Ï¤Ê¤é¤Ê¤¤¡£

ÍøÍÑÎã¤Ë¤Ä¤¤¤Æ¤Ï pivot_root(8) ¤ò»²¾È¤Î¤³¤È¡£

¸½ºß¤Î root ¤¬¥Þ¥¦¥ó¥È¥Ý¥¤¥ó¥È¤Ç¤Ï¤Ê¤¤ (chroot(2) ¤ä pivot_root ¤Î¸å¤Ê¤É¡£°Ê²¼¤â»²¾È) ¾ì¹ç¡¢ ¸Å¤¤ root ¥Ç¥£¥ì¥¯¥È¥ê¤Ç¤Ï¤Ê¤¯¡¢ ¤½¤Î¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Î¥Þ¥¦¥ó¥È¥Ý¥¤¥ó¥È¤¬ put_old ¤Ë¥Þ¥¦¥ó¥È¤µ¤ì¤ë¡£  

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EBUSY

new_root ¤Þ¤¿¤Ï put_old ¤¬¡¢¸½ºß¤Î root ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¾å¤Ë¤¢¤ë¤«¡¢´û¤Ë put_old ¤Ë¤Ê¤ó¤é¤«¤Î¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤¬¥Þ¥¦¥ó¥È¤µ¤ì¤Æ¤¤¤ë¡£

EINVAL

put_old ¤¬ new_root ¤Î²¼Áؤˤʤ¤¡£

ENOTDIR

new_root ¤Þ¤¿¤Ï put_old ¤¬¥Ç¥£¥ì¥¯¥È¥ê¤Ç¤Ê¤¤¡£

EPERM

¥«¥ì¥ó¥È¥×¥í¥»¥¹¤¬´ÉÍý¼Ô¸¢¸Â¤ò»ý¤Ã¤Æ¤¤¤Ê¤¤¡£

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pivot_root ¤Î»È¤¤Êý¤¬¤â¤¦¤Á¤ç¤Ã¤ÈÛ£Ëæ¤Ë¤Ê¤ë¤È¡¢ ¤¢¤Ã¤È¤¤¤¦´Ö¤Ë¤ï¤±¤Î¤ï¤«¤é¤Ê¤¤¾õÂ֤ˤʤäƤ·¤Þ¤¦¤À¤í¤¦  

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