Linux Certif

Toute la documentation sur la certification Linux LPI

unlinkat

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#define _ATFILE_SOURCE

#include <fcntl.h>



int unlinkat(int dirfd, const char *pathname, int flags);

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unlinkat() ¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï¡¢¤³¤Î man ¥Ú¡¼¥¸¤ÇÀâÌÀ¤·¤Æ¤¤¤ë°ã¤¤¤¬¤¢¤ë°Ê³°¤Ï¡¢ (flags ¤Ë AT_REMOVEDIR ¥Õ¥é¥°¤¬´Þ¤Þ¤ì¤ë¤«Èݤ«¤Ë¤è¤ê) unlink(2) ¤Þ¤¿¤Ï rmdir(2) ¤ÈÁ´¤¯Æ±¤¸¤è¤¦¤ËÆ°ºî¤¹¤ë¡£

pathname ¤Ç»ØÄꤵ¤ì¤ë¥Ñ¥¹Ì¾¤¬ÁêÂХѥ¹Ì¾¤Ç¤¢¤ë¾ì¹ç¡¢ ¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿ dirfd ¤Ç»²¾È¤µ¤ì¤ë¥Ç¥£¥ì¥¯¥È¥ê¤«¤é¤ÎÁêÂХѥ¹Ì¾¤È¤·¤Æ²ò¼á¤µ¤ì¤ë (unlink(2) ¤Þ¤¿¤Ï rmdir(2) ¤Ç¤Ï¡¢ÁêÂХѥ¹¤Ï¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î ¥«¥ì¥ó¥È¥ï¡¼¥­¥ó¥°¥Ç¥£¥ì¥¯¥È¥ê¤«¤é¤ÎÁêÂХѥ¹¤È¤Ê¤ë)¡£

pathname ¤Ç»ØÄꤵ¤ì¤ë¥Ñ¥¹Ì¾¤¬ÁêÂХѥ¹Ì¾¤Ç¤¢¤ê¡¢¤«¤Ä dirfd ¤¬ÆÃÊ̤ÊÃÍ AT_FDCWD ¤Ç¤¢¤ë¾ì¹ç¡¢ pathname ¤Ï (unlink(2) ¤Þ¤¿¤Ï rmdir(2) ¤ÈƱ¤¸¤è¤¦¤Ë) ¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î ¥«¥ì¥ó¥È¥ï¡¼¥­¥ó¥°¥Ç¥£¥ì¥¯¥È¥ê¤«¤é¤ÎÁêÂХѥ¹Ì¾¤È¤·¤Æ²ò¼á¤µ¤ì¤ë¡£

pathname ¤Ç»ØÄꤵ¤ì¤ë¥Ñ¥¹Ì¾¤¬ÀäÂХѥ¹Ì¾¤Ç¤¢¤ë¾ì¹ç¡¢ dirfd ¤Ï̵»ë¤µ¤ì¤ë¡£

flags ¤Ï¥Ó¥Ã¥È¥Þ¥¹¥¯¤Ç¤¢¤ê¡¢0 ¤Þ¤¿¤Ï unlinkat() ¤ÎÁàºî¤òÀ©¸æ¤¹¤ë¥Õ¥é¥°ÃͤΠOR ¤ò»ØÄê¤Ç¤­¤ë¡£ ¸½ºß¤Î¤È¤³¤í 1 ¤Ä¤Î¥Õ¥é¥°¤À¤±¤¬ÄêµÁ¤µ¤ì¤Æ¤¤¤ë:

AT_REMOVEDIR

¥Ç¥Õ¥©¥ë¥È¤Ç¤Ï¡¢ unlinkat() ¤Ï pathname ¤ËÂФ·¤Æ unlink(2) ¤ÈƱ¤¸Áàºî¤ò¹Ô¤¦¡£ AT_REMOVEDIR ¥Õ¥é¥°¤¬»ØÄꤵ¤ì¤ë¤È¡¢ pathname ¤ËÂФ·¤Æ rmdir(2) ¤ÈƱ¤¸Áàºî¤ò¹Ô¤¦¡£

ÊÖ¤êÃÍ

À®¸ù¤·¤¿¾ì¹ç¡¢ unlinkat() ¤Ï 0 ¤òÊÖ¤¹¡£ ¥¨¥é¡¼¤Î¾ì¹ç¡¢-1 ¤¬ÊÖ¤µ¤ì¤Æ¡¢ errno ¤Ë¤Ï¥¨¥é¡¼¤ò¼¨¤¹Ãͤ¬ÀßÄꤵ¤ì¤ë¡£

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unlink(2) ¤Þ¤¿¤Ï rmdir(2) ¤ÈƱ¤¸¥¨¥é¡¼¤¬ unlinkat() ¤Ç¤âµ¯¤³¤ë¡£ unlinkat() ¤Ç¤Ï¡¢¤½¤Î¾¤Ë°Ê²¼¤Î¥¨¥é¡¼¤¬µ¯¤³¤ë:

EBADF

dirfd ¤¬Í­¸ú¤Ê¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Ç¤Ê¤¤¡£

EINVAL

flags ¤ËÉÔÀµ¤Ê¥Õ¥é¥°Ãͤ¬»ØÄꤵ¤ì¤¿¡£

ENOTDIR

pathname ¤¬ÁêÂХѥ¹¤Ç¡¢¤«¤Ä dirfd ¤¬¥Ç¥£¥ì¥¯¥È¥ê°Ê³°¤Î¥Õ¥¡¥¤¥ë¤ò»²¾È¤¹¤ë¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Ç¤¢¤ë¡£

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unlinkat() ¤Ï Linux ¥«¡¼¥Í¥ë 2.6.16 ¤ÇÄɲ䵤줿¡£

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¤³¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ïɸ½àŪ¤Ç¤Ï¤Ê¤¤¤¬¡¢ POSIX.1 ¤Î¾­Íè¤Î¥ê¥Ó¥¸¥ç¥ó¤Ë´Þ¤á¤ë¤³¤È¤¬Äó°Æ¤µ¤ì¤Æ¤¤¤ë¡£ Solaris ¤Ë¤Ï¡¢¤³¤ì¤ÈƱ¤¸¤è¤¦¤Ê¥·¥¹¥Æ¥à¥³¡¼¥ë¤¬Â¸ºß¤¹¤ë¡£

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unlinkat() ¤¬É¬ÍפÊÍýͳ¤Ë¤Ä¤¤¤Æ¤Ï¡¢ openat(2) ¤ò»²¾È¤¹¤ë¤³¤È¡£

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openat(2), rmdir(2), unlink(2), path_resolution(7)