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CLOSE
Section: Linux Programmer's Manual (2)Updated: April 14, 1996
Index Return to Main Contents
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close - ¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤ò¥¯¥í¡¼¥º¤¹¤ë½ñ¼°
#include <unistd.h> int close(int fd);
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close ¤Ï¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼ (descriptor) ¤ò¥¯¥í¡¼¥º¤¹¤ë¡£ ¤½¤Î¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤Ï¡¢¤É¤Î¥Õ¥¡¥¤¥ë¤â»²¾È¤·¤Æ¤¤¤Ê¤¤¾õÂ֤ˤʤꡢ ºÆ»ÈÍѤ¬²Äǽ¤Ë¤Ê¤ë¡£ ¸Æ¤Ó½Ð¤·¤¿¥×¥í¥»¥¹¤¬½êͤ·¤Æ¤¤¤ë¥í¥Ã¥¯ (lock) ¤Î¤¦¤Á¡¢ »²¾È¤¹¤ë¥Õ¥¡¥¤¥ë¤Ë´ØÏ¢¤·¤Æ¤¤¤ë¤â¤Î¤ÏÁ´¤Æ (¤½¤Î¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤¬¥í¥Ã¥¯¤ò¼èÆÀ¤¹¤ë¤Î¤Ë »ÈÍѤµ¤ì¤¿¤«¤É¤¦¤«¤Ë¤«¤«¤ï¤é¤º) ºï½ü¤µ¤ì¤ë¡£fd ¤¬¤½¤Î¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤ÎºÇ¸å¤Î¥³¥Ô¡¼¤À¤Ã¤¿¾ì¹ç¤Ë¤Ï¡¢ ¤½¤Î¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤Ë´ØÏ¢¤·¤¿»ñ¸»¤Ï²òÊü¤µ¤ì¤ë¡£ ¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤¬ unlink ¤ò»ÈÍѤ·¤Æºï½ü (remove) ¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¤ËÂФ¹¤ëºÇ¸å¤Î»²¾È¤À¤Ã¤¿¾ì¹ç¤Ë¤Ï¡¢ ¤½¤Î¥Õ¥¡¥¤¥ë¤Ï½üµî (delete) ¤µ¤ì¤ë¡£
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close ¤ÏÀ®¸ù¤·¤¿¾ì¹ç¤Ï¥¼¥í¤òÊÖ¤·¡¢¥¨¥é¡¼¤¬È¯À¸¤·¤¿¾ì¹ç¤Ï -1 ¤òÊÖ¤¹¡£¥¨¥é¡¼
- EBADF
- fd ¤¬Í¸ú¤Ê¥ª¡¼¥×¥ó¤µ¤ì¤¿¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤Ç¤Ê¤¤¡£
- EINTR
- close() ¥³¡¼¥ë¤¬¥·¥°¥Ê¥ë¤Ë¤è¤êÃæÃÇ (interrupt) ¤µ¤ì¤¿¡£
- EIO
- I/O ¥¨¥é¡¼¤¬È¯À¸¤·¤¿¡£
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SVr4, SVID, POSIX, X/OPEN, BSD 4.3 ¤Ë½àµò¤¹¤ë¡£ SVr4 ¤Ë¤Ï¾¤Ë ENOLINK ¥¨¥é¡¼¾õÂ֤ˤĤ¤¤Æ¤Îµ½Ò¤¬¤¢¤ë¡£Ãí°Õ
close ¤ÎÊÖ¤êÃͤΥÁ¥§¥Ã¥¯¤Ï¤è¤¯¾Êά¤µ¤ì¤ë¤¬¡¢ ¤³¤ì¤Ï¿¼¹ï¤Ê¥×¥í¥°¥é¥ß¥ó¥°¥¨¥é¡¼¤Ç¤¢¤ë¡£ Àǽ¤ò¸þ¾å¤µ¤»¤ë¤¿¤á¤Ë ¡ÖÃÙ±ä½ñ¤¹þ¤ß (write-behind)¡×¤òÍѤ¤¤ë¤è¤¦¤Ê¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¼ÂÁõ¤Ç¤Ï¡¢ write(2) ¤¬À®¸ù¤·¤ÆÊ֤俾ì¹ç¤Ç¤â¡¢ ¼ÂºÝ¤Î¥Ç¡¼¥¿½ñ¤¹þ¤ß¤¬½ª¤Ã¤Æ¤¤¤Ê¤¤¤³¤È¤¬¤¢¤ë¡£ (¥¨¥é¡¼¤¬µ¯¤³¤Ã¤¿¾ì¹ç) ¥¨¥é¡¼¥¹¥Æ¡¼¥¿¥¹¤Ï¡¢ ¸å¤Ë write Áàºî¤ò¹Ô¤¨¤ÐÊó¹ð¤µ¤ì¤ë¤«¤â¤·¤ì¤Ê¤¤¤¬¡¢ ¾¯¤Ê¤¯¤È¤â¥Õ¥¡¥¤¥ë¥¯¥í¡¼¥º¤ÎºÝ¤Ë¤Ïɬ¤ºÊó¹ð¤µ¤ì¤ë¤³¤È¤¬Êݾڤµ¤ì¤Æ¤¤¤ë¡£ ¥Õ¥¡¥¤¥ë¥¯¥í¡¼¥º¤ÎºÝ¤ËÊÖ¤êÃͤò¥Á¥§¥Ã¥¯¤·¤Ê¤¤¤È¡¢ µ¤ÉÕ¤«¤Ê¤¤¤¦¤Á¤Ë¥Ç¡¼¥¿¤ò¼º¤Ã¤Æ¤·¤Þ¤¦¤«¤â¤·¤ì¤Ê¤¤¡£ ¤³¤ì¤ÏÆÃ¤Ë NFS ¤ä¥Ç¥£¥¹¥¯¡¦¥¯¥©¡¼¥¿¤ò»ÈÍѤ·¤¿¾ì¹ç¤Ë¸«¤é¤ì¤ë¡£¥¯¥í¡¼¥º¤ËÀ®¸ù¤·¤Æ¤â¡¢¥Ç¡¼¥¿¤¬¥Ç¥£¥¹¥¯¤ËÊݸ¤µ¤ì¤¿¤«¤É¤¦¤«¤Ï Êݾڤµ¤ì¤Ê¤¤ (¥«¡¼¥Í¥ë¤¬½ñ¤¤³¤ß¤òÃٱ䤵¤»¤ë¤³¤È¤¬¤¢¤ë¤Î¤Ç)¡£ ¥¹¥È¥ê¡¼¥à¤¬¥¯¥í¡¼¥º¤µ¤ì¤ë¤È¤¤Ë¥Ð¥Ã¥Õ¥¡¤ò¥Õ¥é¥Ã¥·¥å¤¹¤ë¤«¤É¤¦¤«¤Ï¡¢ ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Ë¤è¤Ã¤Æ°Û¤Ê¤ë¡£ ¥Ç¡¼¥¿¤¬ÊªÍýŪ¤ËÊݸ¤µ¤ì¤ë¤³¤È¤ò³Î¤«¤Ë¤¹¤ëɬÍפ¬¤¢¤ë¾ì¹ç¤Ë¤Ï¡¢ fsync(2) ¤Þ¤¿¤Ï sync(2) ¤ò»ÈÍѤ¹¤ë¤³¤È¡£ ¤³¤ì¤é¤Î´Ø¿ô¤Ï¤è¤ê¤½¤ÎÌÜŪ¤Ë¶á¤¤Æ°ºî¤ò¤¹¤ë (¤³¤Î»þÅÀ¤Ç¤Ï¥Ç¥£¥¹¥¯¤Î¥Ï¡¼¥É¥¦¥§¥¢¤Ë°Í¸¤¹¤ë)¡£
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open(2), fcntl(2), shutdown(2), unlink(2), fclose(3)