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CHROOT

Section: Linux Programmer's Manual (2)
Updated: 21 August 1997
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chroot - ¥ë¡¼¥È¡¦¥Ç¥£¥ì¥¯¥È¥ê¤òÊѹ¹¤¹¤ë  

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#include <unistd.h>

int chroot(const char *path);  

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chroot ¤Ï¡¢¥ë¡¼¥È¡¦¥Ç¥£¥ì¥¯¥È¥ê¤ò path ¤Ç»ØÄꤵ¤ì¤¿¥Ç¥£¥ì¥¯¥È¥ê¤ËÊѹ¹¤¹¤ë¡£ ¤³¤Î¥Ç¥£¥ì¥¯¥È¥ê°Ê²¼¤¬ / ¤«¤é»Ï¤Þ¤ë¥Ñ¥¹Ì¾¤È¤·¤Æ»È¤ï¤ì¤ë¡£ ¤³¤Î¥ë¡¼¥È¡¦¥Ç¥£¥ì¥¯¥È¥ê¤Ï¸½ºß¤Î¥×¥í¥»¥¹¤ÎÁ´¤Æ¤Î»Ò¥×¥í¥»¥¹¤Ë¼õ¤±·Ñ¤¬¤ì¤ë¡£

¥¹¡¼¥Ñ¡¼¡¦¥æ¡¼¥¶¡¼¤À¤±¤¬¥ë¡¼¥È¡¦¥Ç¥£¥ì¥¯¥È¥ê¤òÊѹ¹¤Ç¤­¤ë¡£

¤³¤Î¥³¡¼¥ë¤Ï¸½ºß¤Îºî¶È¥Ç¥£¥ì¥¯¥È¥ê (working directory) ¤òÊѹ¹¤·¤Ê¤¤¤³¤È¤ËÃí°Õ¡£ ¤½¤Î¤¿¤á '.' ¤¬ '/' ¤òº¬¤È¤¹¤ë¥Ä¥ê¡¼¤Î³°¤Ë¤Ê¤ë¾ì¹ç¤¬¤¢¤ë¡£ ÆÃ¤Ë¡¢¥¹¡¼¥Ñ¡¼¡¦¥æ¡¼¥¶¡¼¤Ï `mkdir foo; chroot foo; cd ..' ¤È¤¹¤ì¤Ð¡Öchroot jail¡×¤«¤éƨ¤²½Ð¤»¤Æ¤·¤Þ¤¦¡£  

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À®¸ù¤¹¤ë¤È 0 ¤òÊÖ¤¹¡£ ¼ºÇÔ¤¹¤ë¤È -1¤òÊÖ¤·¡¢ errno ¤ËŬÀÚ¤ÊÃͤòÀßÄꤹ¤ë¡£  

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¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Ë¤è¤Ã¤Æ¤Ï¾¤Î¥¨¥é¡¼¤¬ÊÖ¤µ¤ì¤ë»ö¤¬¤¢¤ë¡£ °ìÈÌŪ¤Ê¥¨¥é¡¼¤ò°Ê²¼¤Ëµó¤²¤ë:
EPERM
¼Â¸ú UID ¤¬¥¼¥í¤Ç¤Ê¤¤¡£
EFAULT
path ¤¬³ä¤êÅö¤Æ¤é¤ì¤¿¥¢¥É¥ì¥¹¶õ´Ö³°¤ò»Ø¤·¤Æ¤¤¤ë¡£
ENAMETOOLONG
path ¤¬Ä¹²á¤®¤ë¡£
ENOENT
¥Õ¥¡¥¤¥ë¤¬Â¸ºß¤·¤Ê¤¤¡£
ENOMEM
¥«¡¼¥Í¥ë¤Ë½½Ê¬¤Ê¥á¥â¥ê¤¬¤Ê¤¤¡£
ENOTDIR
path ¤ÎÆâÍÆ¤¬¥Ç¥£¥ì¥¯¥È¥ê¤Ç¤Ï¤Ê¤¤¡£
EACCES
¥Ñ¥¹Ì¾¤ÎÅÓÃæ¤Î¤É¤³¤«¤Ë¸¡º÷µö²Ä (search permission) ¤¬¤Ê¤¤¡£
ELOOP
path ¤ò²ò·è¤¹¤ëºÝ¤ËÁø¶ø¤·¤¿¥·¥ó¥Ü¥ê¥Ã¥¯¡¦¥ê¥ó¥¯¤¬Â¿²á¤®¤ë¡£
EIO
I/O ¥¨¥é¡¼¤¬È¯À¸¤·¤¿¡£
 

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SVr4, SVID, 4.4BSD, X/OPEN¡£ ¤³¤Î´Ø¿ô¤Ï POSIX.1 ¤Ë¤Ï¤Ê¤¤¡£ SVr4 ¤Ë¤Ï¾¤Ë EINTR, ENOLINK, EMULTIHOP ¥¨¥é¡¼¾õÂ֤ˤĤ¤¤Æ¤Îµ­½Ò¤¬¤¢¤ë¡£ X/OPEN ¤Ë¤Ï EIO, ENOMEM, EFAULT ¥¨¥é¡¼¾õÂ֤ε­½Ò¤Ï¤Ê¤¤¡£ ¤³¤Î¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹¤Ï X/OPEN ¤ò¼õ¤±·Ñ¤¤¤À¤â¤Î¤Ç¤¢¤ë¡£  

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chdir(2)


 

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