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LISTEN
Section: Linux Programmer's Manual (2)Updated: 23 July 1993
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listen - ¥½¥±¥Ã¥È(socket)¾å¤ÎÀܳ¤òÂԤĽñ¼°
#include <sys/socket.h>int listen(int s, int backlog);
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Àܳ¤ò¼õ¤±ÉÕ¤±¤ë¤¿¤á¤Ë¡¢¥½¥±¥Ã¥È¤ÏºÇ½é¤Ë socket(2) ¤ÇÀ¸À®¤µ¤ì¤ë¡£Æþ¤Ã¤Æ¤¯¤ëÀܳ¤Î¤¿¤á¤Î¥¥å¡¼¤ÎºÇÂçĹ¤Ï listen ¤Ë¤è¤Ã¤Æ»ØÄꤵ¤ì¤¿¤¢¤È¡¢Àܳ¤¬ accept(2) ¤Ë¤è¤Ã¤Æ¼õ¤±ÉÕ¤±¤é¤ì¤ë¡£ listen ¥³¡¼¥ë¤Ï SOCK_STREAM ·¿¤Þ¤¿¤Ï SOCK_SEQPACKET ·¿¤Î¥½¥±¥Ã¥È¤Î¤ß¤ËŬÍѤǤ¤ë¡£
backlog °ú¤¿ô¤Ï¡¢ÊÝαÃæ¤ÎÀܳ¤Î¥¥å¡¼¤¬³ÈÄ¥¤¹¤ë¤³¤È¤Î¤Ç¤¤ëºÇÂçŤò»ØÄꤹ¤ë¡£ ¥¥å¡¼¤¬¤¤¤Ã¤Ñ¤¤¤Î¾õÂÖ¤ÇÀܳÍ׵᤬ÅþÃ夹¤ë¤È¡¢¥¯¥é¥¤¥¢¥ó¥È¤Ï ECONNREFUSED ¤È¤¤¤¦¥¨¥é¡¼¤ò¼õ¤±¼è¤ë¡£²¼°ÌÁؤΥץí¥È¥³¥ë¤¬ºÆÁ÷¿®¤ò¥µ¥Ý¡¼¥È ¤·¤Æ¤¤¤ì¤Ð¡¢Í×µá¤Ï̵»ë¤µ¤ì¡¢¥ê¥È¥é¥¤¤¬À®¸ù¤¹¤ë¤«¤â¤·¤ì¤Ê¤¤¡£
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TCP ¥½¥±¥Ã¥È¤Ç¤Î backlog °ú¿ô¤Î¿¶¤ëÉñ¤¤¤Ï Linux 2.2 ¤ÇÊѹ¹¤µ¤ì¤¿¡£ ¸½ºß¤Ç¤Ï¤³¤Î°ú¿ô¤Ï¡¢ ¼õ¤±ÉÕ¤±¤é¤ì¤ë¤Î¤òÂԤäƤ¤¤ë¡¢ ´°Á´¤Ë ³ÎΩ¤µ¤ì¤¿¥½¥±¥Ã¥È¤Î¥¥å¡¼¤ÎŤµ¤ò»ØÄꤹ¤ë¡£ °ÊÁ°¤ÏÉÔ´°Á´¤ÊÀܳÍ×µá¤Î¿ô¤Ç¤¢¤Ã¤¿¤¬¡¢¤³¤ì¤òÃÖ¤´¹¤¨¤¿¡£ ÉÔ´°Á´¤Ê¥½¥±¥Ã¥È¤Î¥¥å¡¼¤ÎºÇÂçĹ¤Ï sysctl ´Ø¿ô¤Î tcp_max_syn_backlog ¤òÍѤ¤¤Æ¥»¥Ã¥È¤¹¤ë¡£ syncookie ¤¬Í¸ú¤Ë¤Ê¤Ã¤Æ¤¤¤ë¾ì¹ç¡¢ ÏÀÍýŪ¤ËºÇÂçĹ¤Ï¸ºß¤»¤º¡¢ sysctl ´Ø¿ô¤Ë¤è¤ëÀßÄê¤Ï̵»ë¤µ¤ì¤ë¡£ÊÖ¤êÃÍ
À®¸ù»þ¤Ë¤Ï0¤òÊÖ¤¹¡£¥¨¥é¡¼»þ¤Ë¤Ï -1¤òÊÖ¤·¡¢ errno ¤òŬÀÚ¤ËÀßÄꤹ¤ë¡£¥¨¥é¡¼
- EADDRINUSE
- Ê̤Υ½¥±¥Ã¥È¤¬´û¤ËƱ¤¸¥Ý¡¼¥È¤ò listen ¤·¤Æ¤¤¤ë¡£
- EBADF
- °ú¤¿ô s ¤Ï͸ú¤Ê¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤Ç¤Ï¤Ê¤¤¡£
- ENOTSOCK
- °ú¤¿ô s ¤Ï¥½¥±¥Ã¥È¤Ç¤Ï¤Ê¤¤¡£
- EOPNOTSUPP
- ¥½¥±¥Ã¥È¤Ï listen ¤¬¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤ë·¿¤Ç¤Ï¤Ê¤¤¡£
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Single Unix, 4.4BSD, POSIX 1003.1g ¥É¥é¥Õ¥È¡£ listen ´Ø¿ô¤Ï 4.2BSD¤Ç½é¤á¤Æ¼ÂÁõ¤µ¤ì¤¿¡£¥Ð¥°
¥½¥±¥Ã¥È¤¬ AF_INET ·¿¤Ç¤¢¤ê¡¢ backlog °ú¤¿ô¤¬ SOMAXCONN Äê¿ô (Linux 2.0 ¤È 2.2 ¤Ç¤Ï 128) ¤è¤ê¤âÂ礤±¤ì¤Ð¡¢backlog ¤Ï°ÅÌۤΤ¦¤Á¤Ë SOAXCONN ¤ËÀÚ¤êµÍ¤á¤é¤ì¤ë¡£ BSD (¤È¡¢¤¤¤¯¤Ä¤«¤Î BSD ¤«¤éÇÉÀ¸¤·¤¿¥·¥¹¥Æ¥à)¤Ç¤Ï backlog ¤ò 5 ¤Ë À©¸Â¤·¤Æ¤¤¤ë¤Î¤Ç¡¢°Ü¿¢À¤ò¹Íθ¤·¤¿¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ç¤Ï ¤³¤ÎÃÍ (SOMAXCONN) ¤ËÍê¤Ã¤Æ¤Ï¤¤¤±¤Ê¤¤¡£´ØÏ¢¹àÌÜ
accept(2), connect(2), socket(2)