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NULL
Section: Linux Programmer's Manual (4)Updated: 21 November 1992
Index Return to Main Contents
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null, zero - ¥Ç¡¼¥¿¤ÎÁݤ¤À¤áÀâÌÀ
null ¤Þ¤¿¤Ï zero ¥¹¥Ú¥·¥ã¥ë¥Õ¥¡¥¤¥ë(special file)¤Ë½ñ¤«¤ì ¤¿¥Ç¡¼¥¿¤Ï¼Î¤Æ¤é¤ì¤ë¡£null ¥¹¥Ú¥·¥ã¥ë¥Õ¥¡¥¤¥ë¤òÆɤà¤È¾ï¤Ë end of file ¤¬ÊÖ¤µ¤ì¡¢ÂоÈŪ ¤Ë zero ¤òÆɤà¤È¾ï¤Ë \0 ʸ»ú(null ʸ»ú)¤¬ÊÖ¤µ¤ì¤ë¡£
null ¤È zero ¤Ï°ìÈÌŪ¤Ë¼¡¤Î¤è¤¦¤Ë¤·¤Æºî¤é¤ì¤ë:
-
mknod -m 666 /dev/null c 1 3
mknod -m 666 /dev/zero c 1 5
chown root:mem /dev/null /dev/zero
Ãí°Õ
¤â¤·¡¢¤³¤ì¤é¤Î¥Ç¥Ð¥¤¥¹¤¬Á´¤Æ¤Î¥æ¡¼¥¶¤ËÂФ·¤ÆÆɤ߽ñ¤²Äǽ¤Ç¤Ê¤¤¾ì¹ç¡¢Â¿ ¤¯¤Î¥×¥í¥°¥é¥à¤ÎÆ°ºî¤¬¤ª¤«¤·¤¯¤Ê¤ë¤À¤í¤¦¡£¥Õ¥¡¥¤¥ë
/dev/null/dev/zero
´ØÏ¢¹àÌÜ
mknod(1), chown(1)ËÝÌõ¼Ô
ÀÐÀî ËÓ <ishikawa@linux.or.jp>