Linux Certif

Toute la documentation sur la certification Linux LPI

fchmodat

̾Á°

fchmodat - ¥Ç¥£¥ì¥¯¥È¥ê¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤«¤éÁêÂÐŪ¤Ê°ÌÃ֤ˤ¢¤ë¥Õ¥¡¥¤¥ë¤Î¥¢¥¯¥»¥¹¸¢¤òÊѹ¹¤¹¤ë

½ñ¼°

#define _ATFILE_SOURCE

#include <sys/stat.h>



int fchmodat(int dirfd, const char *pathname, mode_t mode, int flags);

ÀâÌÀ

fchmodat() ¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï¡¢¤³¤Î man ¥Ú¡¼¥¸¤ÇÀâÌÀ¤·¤Æ¤¤¤ë°ã¤¤¤¬¤¢¤ë°Ê³°¤Ï¡¢ chmod(2) ¤ÈÁ´¤¯Æ±¤¸¤è¤¦¤ËÆ°ºî¤¹¤ë¡£

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

pathname ¤¬ÁêÂХѥ¹¤Ç¤¢¤ê¡¢¤«¤Ä dirfd ¤¬ÆÃÊ̤ÊÃÍ AT_FDCWD ¤Ç¤¢¤ë¾ì¹ç¡¢ pathname ¤Ï (chmod(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 ¤¬ÀäÂХѥ¹¤Ç¤¢¤ë¾ì¹ç¡¢ dirfd ¤Ï̵»ë¤µ¤ì¤ë¡£

flags ¤Ï 0 ¤Þ¤¿¤Ï°Ê²¼¤Î¥Õ¥é¥°¤Ç¤¢¤ë¡£

AT_SYMLINK_NOFOLLOW

pathname ¤¬¥·¥ó¥Ü¥ê¥Ã¥¯¥ê¥ó¥¯¤Î¾ì¹ç¤Ï¡¢¤½¤ì¤òé¤ë¤Î¤Ç¤Ï¤Ê¤¯¡¢ ¥ê¥ó¥¯¼«¿È¤ËÂФ·¤Æ (¥¢¥¯¥»¥¹¸¢¤ÎÊѹ¹¤Î) Áàºî¤ò¹Ô¤¦¡£ ¤³¤Î¥Õ¥é¥°¤Ï¸½ºß¤Î¤È¤³¤í¼ÂÁõ¤µ¤ì¤Æ¤¤¤Ê¤¤¡£

ÊÖ¤êÃÍ

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

¥¨¥é¡¼

chmod(2) ¤ÈƱ¤¸¥¨¥é¡¼¤¬ fchmodat() ¤Ç¤âµ¯¤³¤ë¡£ fchmodat() ¤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¡£

ENOTSUP

flags ¤Ë¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤Ê¤¤ÃÍ AT_SYMLINK_NOFOLLOW ¤¬ »ØÄꤵ¤ì¤¿¡£

¥Ð¡¼¥¸¥ç¥ó

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

½àµò

¤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¡£

Ãí°Õ

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

´ØÏ¢¹àÌÜ

chmod(2), openat(2), path_resolution(7)