umask

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Langue: ja

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Version: 2006-05-13 (openSuse - 09/10/07)

Section: 2 (Appels système)

Sommaire

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umask - ¥Õ¥¡¥¤¥ë¥â¡¼¥ÉºîÀ®¥Þ¥¹¥¯¤òÀßÄꤹ¤ë

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#include <sys/types.h>
#include <sys/stat.h>

mode_t umask(mode_t mask);

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umask() ¤Ï¡¢¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î¥Õ¥¡¥¤¥ë¥â¡¼¥ÉºîÀ®¥Þ¥¹¥¯ (umask) ¤ò mask & 0777 ¤ËÀßÄꤹ¤ë¡£

umask ¤Ï¡¢ open(2), mkdir(2) ¤ä¥Õ¥¡¥¤¥ëºîÀ®¤ò¹Ô¤¦¤½¤Î¾¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ç¡¢ ¿·¤·¤¯ºîÀ®¤µ¤ì¤ë¥Õ¥¡¥¤¥ë¤ä¥Ç¥£¥ì¥¯¥È¥ê¤Îµö²Ä (permission) ¤ò ½¤Àµ¤¹¤ë¤¿¤á¤Ë»ÈÍѤµ¤ì¤ë¡£ ¶ñÂÎŪ¤Ë¤Ï umask ¤ËÀßÄꤵ¤ì¤Æ¤¤¤ëµö²Ä¤¬ open(2) ¤ä mkdir(2) ¤Î mode °ú¤­¿ô¤«¤é¼è¤ê¾Ã¤µ¤ì¤ë¡£

mask ¤Ë»ØÄꤹ¤ë¤Î¤Ë»ÈÍѤ¹¤Ù¤­Äê¿ô¤Ë¤Ä¤¤¤Æ¤Ï stat(2) ¤ÇÀâÌÀ¤µ¤ì¤Æ¤¤¤ë¡£

¥×¥í¥»¥¹¤Î umask ¤Î¤è¤¯¤¢¤ë¥Ç¥Õ¥©¥ë¥ÈÃÍ¤Ï S_IWGRP | S_IWOTH (8¿Ê¤Ç 022) ¤Ç¤¢¤ë¡£ ¿·¤·¤¤¥Õ¥¡¥¤¥ë¤òºîÀ®¤¹¤ëºÝ¤Ë open(2) ¤Î mode °ú¤­¿ô¤Ë




    S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH
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    S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH
¤È¤¤¤¦µö²Ä¤ò»ý¤Ä¤³¤È¤Ë¤Ê¤ë (¤Ê¤¼¤Ê¤é 0666 & ~022 = 0644¡¢¤Ä¤Þ¤ê rw-r--r--)¡£

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SVr4, 4.3BSD, POSIX.1-2001.

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fork(2) ¤ÇºîÀ®¤µ¤ì¤¿»Ò¥×¥í¥»¥¹¤Ï¡¢¿Æ¥×¥í¥»¥¹¤Î umask ¤ò·Ñ¾µ¤¹¤ë¡£ execve(2) ¤Ë¤è¤Ã¤Æ umask ¤ÏÊѹ¹¤µ¤ì¤Ê¤¤¡£

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chmod(2), mkdir(2), open(2), stat(2)