 |
|
|
Home :: International :: Manuals :: Howto :: FAQ :: Man Pages :: Email Login |
ACCEPT
Section: Linux Programmer's Manual (2)Updated: 7 May 1999
Index Return to Main Contents
̾Á°
accept - ¥½¥±¥Ã¥È¤Ø¤ÎÀܳ¤ò¼õ¤±¤ë½ñ¼°
#include <sys/types.h>#include <sys/socket.h>
int accept(int s, struct sockaddr *addr, socklen_t *addrlen);
ÀâÌÀ
accept ´Ø¿ô¤Ï¡¢Àܳ»Ø¸þ¤Î¥½¥±¥Ã¥È·¿ (SOCK_STREAM, SOCK_SEQPACKET, SOCK_RDM) ¤ËÍѤ¤¤é¤ì¤ë¡£ ¤³¤Î´Ø¿ô¤Ï¡¢ÊÝα¾õÂÖ¤ÎÀܳÍ׵᤬Æþ¤Ã¤Æ¤¤¤ë¥¥å¡¼¤«¤é ÀèƬ¤ÎÀܳÍ×µá¤ò¼è¤ê½Ð¤·¡¢ s ¤È¤Û¤ÜƱ¤¸Â°À¤ò»ý¤Ã¤¿ÀܳºÑ¤ß¥½¥±¥Ã¥È¤ò¿·µ¬¤ËÀ¸À®¤·¡¢ ¤³¤Î¥½¥±¥Ã¥È¤Ë¿·¤·¤¤¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤ò³ä¤êÅö¤Æ¡¢ ¤½¤Î¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤òÊÖ¤¹¡£ ¤â¤È¤â¤È¤Î¥½¥±¥Ã¥È s ¤Ï¤³¤Î¸Æ¤Ó½Ð¤·¤Ë¤è¤Ã¤Æ±Æ¶Á¤ò¼õ¤±¤Ê¤¤¡£ ¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤ËÂФ¹¤ë¥Õ¥é¥° (F_SETFL fcntl ¤Ë¤è¤Ã¤ÆÀßÄꤵ¤ì¤ë¤â¤Î¤¹¤Ù¤Æ¡£ÈóÄä»ß (non-blocking) ¤ä ÈóƱ´ü (async) ¤Ê¤É) ¤Ï¡¢ accept ¤Ë¤è¤Ã¤Æ¤Ï·Ñ¾µ¤µ¤ì¤Ê¤¤¤³¤È¤ËÃí°Õ¡£°ú¤¿ô s ¤Ï¡¢ socket(2) ¤Ë¤è¤Ã¤ÆÀ¸À®¤µ¤ì¡¢ bind(2) ¤Ë¤è¤Ã¤Æ¥í¡¼¥«¥ë¥¢¥É¥ì¥¹¤Ë¥Ð¥¤¥ó¥É¤µ¤ì¡¢ listen(2) ¤ò·Ð¤ÆÀܳ¤òÂԤäƤ¤¤ë¥½¥±¥Ã¥È¤Ç¤¢¤ë¡£
addr °ú¿ô¤Ï sockaddr ¹½Â¤ÂΤؤΥݥ¤¥ó¥¿¤Ç¤¢¤ë¡£ ¤³¤Î¹½Â¤ÂΤˤÏÀܳ¼ÂÂΤΥ¢¥É¥ì¥¹¤¬Æþ¤Ã¤Æ¤¤¤ë (¤³¤ÎÀܳ¼ÂÂΤÏÄÌ¿®ÁؤȸƤФì¤Æ¤¤¤ë¤â¤Î¤Ç¤¢¤ë) ¡£ addr °ú¤¿ô¤ÇÅϤ¹¥¢¥É¥ì¥¹¤ÎÀµ³Î¤Ê¥Õ¥©¡¼¥Þ¥Ã¥È¤Ï¡¢ ¥½¥±¥Ã¥È¤Î¥Õ¥¡¥ß¥ê¡¼¤Ë¤è¤Ã¤Æ·è¤Þ¤ë (socket(2) ¤ª¤è¤Ó¤½¤ì¤¾¤ì¤Î¥×¥í¥È¥³¥ë¤Î man ¥Ú¡¼¥¸¤ò¸«¤è)¡£ addrlen °ú¿ô¤ÏÆþ½ÐÎÏξÍѤΥѥé¥á¡¼¥¿¤Ç¡¢ ºÇ½é¤Ï addr ¤¬¥Ý¥¤¥ó¥È¤¹¤ë¹½Â¤ÂΤΥµ¥¤¥º¤ò³ÊǼ¤·¤Æ¤¤¤ë¡£ ¥ê¥¿¡¼¥ó»þ¤Ë¤Ï¡¢ÊÖ¤µ¤ì¤¿¥¢¥É¥ì¥¹¤Î¼ÂºÝ¤ÎŤµ(byteñ°Ì)¤¬Æþ¤ë¡£ addr ¤¬ NULL ¤Î»þ¤Ï²¿¤âÂåÆþ¤µ¤ì¤Ê¤¤¡£
¥¥å¡¼¤ËÊÝα¤È¤Ê¤Ã¤Æ¤¤¤ëÀܳÍ׵᤬¤Ê¤¯¡¢ ¤«¤Ä¥½¥±¥Ã¥È¤¬ÈóÄä»ß¤Ë¤Ê¤Ã¤Æ¤¤¤Ê¤¤¤È¤¤Ï¡¢ accept ¤ÏÀܳ¤¬È¯À¸¤¹¤ë¤Þ¤Ç¸Æ¤Ó½Ð¤·¸µ¤òÄä»ß (block) ¤¹¤ë¡£ ¥½¥±¥Ã¥È¤¬ÈóÄä»ß¤Ë¤Ê¤Ã¤Æ¤¤¤Æ¡¢ ÂÔ¤Á¾õÂÖ¤ÎÀܳÍ׵᤬¥¥å¡¼¤Ë̵¤¤¤È¤¤Ï¡¢ accept ¤Ï EAGAIN ¤òÊÖ¤¹¡£
¥½¥±¥Ã¥È¤Ø¤ÎÀܳÅþÃå¤òÃΤë¤Ë¤Ï¡¢ select(2) ¤Þ¤¿¤Ï poll(2) ¤òÍѤ¤¤ì¤Ð¤è¤¤¡£ ¿·¤·¤¤ÀܳÍ׵᤬Íè¤ë¤È¥½¥±¥Ã¥È¤ÏÆɤ߹þ¤ß²Äǽ¤Ë¤Ê¤ë¤Î¤Ç¡¢ ¤½¤¦¤·¤¿¤é accept ¤ò¸Æ¤ó¤Ç¤½¤ÎÀܳ¤ËÂФ¹¤ë¥½¥±¥Ã¥È¤ò¼èÆÀ¤¹¤ì¤Ð¤è¤¤¡£ ¤¢¤ë¤¤¤Ï¥½¥±¥Ã¥È¤òÀßÄꤷ¤Æ¡¢²¿¤é¤«¤Î¥¢¥¯¥·¥ç¥ó¤¬¤¢¤Ã¤¿¤È¤¤Ë SIGIO ¤òÇÛÁ÷ (deliver) ¤µ¤»¤ë¤è¤¦¤Ë¤¹¤ë¤³¤È¤â¤Ç¤¤ë¡£¾ÜºÙ¤Ï socket(7) ¤ò»²¾È¤Î¤³¤È¡£
ÌÀ¼¨Åª¤ÊÀܳ³Îǧ (confirmation) ¤òɬÍפȤ¹¤ë¤è¤¦¤Ê¥×¥í¥È¥³¥ë (DECNet ¤Ê¤É) ¤Ç¤Ï¡¢ accept ¤Ïñ¤Ë¼¡¤ÎÀܳÍ×µá¤ò¥¥å¡¼¤«¤é¼è¤ê½Ð¤¹¤À¤±¤Ç¤¢¤ê¡¢ Àܳ³Îǧ¤Ï¹Ô¤ï¤Ê¤¤¤³¤È¤ËÃí°Õ¤»¤è¡£Àܳ³Îǧ¤Ï¡¢ ¿·¤·¤¤¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤ËÂФ¹¤ë Ä̾ï¤ÎÆɤ߼è¤ê/½ñ¤¹þ¤ß¤Ë¤è¤Ã¤Æ¤Ê¤µ¤ì¡¢ÀܳµñÈÝ (rejection) ¤Ï¿·¤·¤¤¥½¥±¥Ã¥È¤ò¥¯¥í¡¼¥º¤¹¤ë¤³¤È¤Ë¤è¤Ã¤Æ¤Ê¤µ¤ì¤ë¡£ ¸½ºß¤Î¤È¤³¤í¡¢ Linux ¾å¤Ç¤³¤ì¤é¤Î¥»¥Þ¥ó¥Æ¥£¥¯¥¹¤ò»ý¤Ä¤Î¤Ï DECNet ¤À¤±¤Ç¤¢¤ë¡£
Ãí°Õ
SIGIO ¤¬ÆϤ±¤é¤ì¤¿¸å¤ä¡¢ select(2) ¤Þ¤¿¤Ï poll(2) ¤¬Æɤ߹þ¤ß²Äǽ¥¤¥Ù¥ó¥È¤òÊÖ¤·¤¿¸å¤Ë¡¢ ɬ¤º¤·¤âÂÔµ¡Ãæ¤ÎÀܳ¤¬¤¢¤ë¤È¤Ï¸Â¤é¤Ê¤¤¡£ ¤Ê¤¼¤Ê¤é¤½¤ÎÀܳ¤Ï¡¢ accept ¤¬¸Æ¤Ð¤ì¤ëÁ°¤Ë¡¢ÈóƱ´üŪ¤Ê¥Í¥Ã¥È¥ï¡¼¥¯¥¨¥é¡¼¤ä ¾¤Î¥¹¥ì¥Ã¥É¤«¤é¸Æ¤Ð¤ì¤¿ (Ê̤Î) accept ¤Ë¤è¤Ã¤Æ ºï½ü¤µ¤ì¤Æ¤¤¤ë¤«¤â¤·¤ì¤Ê¤¤¤«¤é¤Ç¤¢¤ë¡£ ¤³¤Î¾ì¹ç¡¢¤½¤Î accept ¸Æ¤Ó½Ð¤·¤ÏÄä»ß (block) ¤·¡¢¼¡¤ÎÀܳ¤ÎÅþÃå¤òÂÔ¤Á¤Ä¤Å¤±¤ë¡£ accept ¤ËÄä»ß¤ò¹Ô¤ï¤»¤Ê¤¤¤è¤¦¤Ë¤¹¤ë¤Ë¤Ï¡¢ÅϤ¹¥½¥±¥Ã¥È s ¤Ë O_NONBLOCK ¥Õ¥é¥°¤ò¥»¥Ã¥È¤·¤Æ¤ª¤¯É¬Íפ¬¤¢¤ë (socket(7) ¤ò¸«¤è)¡£ÊÖ¤êÃÍ
¤³¤Î¥³¡¼¥ë¤Ï¥¨¥é¡¼¤¬µ¯¤³¤ë¤È -1 ¤òÊÖ¤¹¡£ À®¸ù¤·¤¿»þ¤Ï¼õ¤±ÉÕ¤±¤¿¥½¥±¥Ã¥È¤Î¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤Ç¤¢¤ëÈóÉé¤ÎÀ°¿ôÃͤòÊÖ¤¹¡£¥¨¥é¡¼½èÍý
Linux ¤Î accept ¤Ï¡¢¿·¤·¤¤¥½¥±¥Ã¥È¤Ë¤ª¤±¤ë¡¢È¯À¸ºÑ¤ß¤Î¥Í¥Ã¥È¥ï¡¼¥¯¥¨¥é¡¼¤ò accept ¤«¤é¤Î¥¨¥é¡¼¥³¡¼¥É¤È¤·¤ÆÅϤ¹¡£ ¤³¤Î¿¶Éñ¤¤¤Ï BSD ¥½¥±¥Ã¥È¤Î¼ÂÁõ¤È¤Ï°Û¤Ê¤ë¡£ ¿®ÍêÀ¤Î¹â¤¤Æ°ºî¤ò¹Ô¤¦¤¿¤á¤Ë¤Ï¡¢ ¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ï¥×¥í¥È¥³¥ë¤ÇÄêµÁ¤µ¤ì¤Æ¤¤¤ë¥Í¥Ã¥È¥ï¡¼¥¯¥¨¥é¡¼¤Î¸¡ÃΤò accept ¤Î¤¢¤È¤Ë¹Ô¤¤¡¢¤½¤ì¤é¤Î¥¨¥é¡¼¤ò EAGAIN ¤ÈƱ¤¸¤è¤¦¤Ë°·¤¤¡¢ºÆ»î¹Ô (retry) ¤ò¹Ô¤¦¤Ù¤¤Ç¤¢¤ë¡£ TCP/IP ¤Ç¤Ï¡¢¤³¤ì¤é¤Ï ENETDOWN, EPROTO, ENOPROTOOPT, EHOSTDOWN, ENONET, EHOSTUNREACH, EOPNOTSUPP, ENETUNREACH ¤Ç¤¢¤ë¡£¥¨¥é¡¼
- EAGAIN ¤Þ¤¿¤Ï EWOULDBLOCK
- ¥½¥±¥Ã¥È¤¬ÈóÄä»ß¤Ë¤Ê¤Ã¤Æ¤¤¤Æ¡¢ ¤«¤Ä¼õÉÕ¤±ÂоݤÎÀܳ¤¬Â¸ºß¤·¤Ê¤¤¡£
- EBADF
- ¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤¬ÉÔÀµ¡£
- ENOTSOCK
- ¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤Ï¥½¥±¥Ã¥È¤Ç¤Ï¤Ê¤¯¥Õ¥¡¥¤¥ë¤ò»²¾È¤·¤Æ¤¤¤ë¡£
- EOPNOTSUPP
- »²¾È¤·¤Æ¤¤¤ë¥½¥±¥Ã¥È¤Î·¿¤¬ SOCK_STREAM ¤Ç¤Ê¤¤¡£
- EFAULT
- addr °ú¤¿ô¤¬¥æ¡¼¥¶¥¢¥É¥ì¥¹¶õ´Ö¤Î½ñ¤¹þ¤ß²ÄǽÎΰè¤Ë¤Ê¤¤¡£
- EPERM
- ¥Õ¥¡¥¤¥¢¥¦¥©¡¼¥ë¤Î¥ë¡¼¥ë¤Ë¤è¤êÀܳ¤¬¶Ø»ß¤µ¤ì¤¿¡£
- ENOBUFS, ENOMEM
- ¥á¥â¥ê¤¬Â¤ê¤Ê¤¤¡£ ¿¤¯¤Î¾ì¹ç¤Ï¡¢¥·¥¹¥Æ¥à¥á¥â¥ê¤¬Â¤ê¤Ê¤¤¤ï¤±¤Ç¤Ï¤Ê¤¯¡¢ ¥½¥±¥Ã¥È¥Ð¥Ã¥Õ¥¡¤ÎÂ礤µ¤Ë¤è¤ë¥á¥â¥ê³ä¤êÅö¤Æ¤ÎÀ©¸Â¤Ç¤¢¤ë¡£
¤³¤Î¾¤Ë¡¢¿·¤·¤¤¥½¥±¥Ã¥È¤ËÂФ¹¤ë¥Í¥Ã¥È¥ï¡¼¥¯¥¨¥é¡¼¤¬ÊÖ¤µ¤ì¤ë¤³¤È¤â¤¢¤ë¡£ ¤³¤ì¤é¤Ï¤½¤ì¤¾¤ì¤Î¥×¥í¥È¥³¥ë¤ÇÄêµÁ¤µ¤ì¤Æ¤¤¤ë¡£ ¤¤¤í¤¤¤í¤Ê Linux ¥«¡¼¥Í¥ë¤Ç¤Ï¡¢ °Ê²¼¤Ë¼¨¤¹¤è¤¦¤Ê¥¨¥é¡¼¤òÊÖ¤¹¤³¤È¤â¤¢¤ë¡£ EMFILE, EINVAL, ENOSR, ENOBUFS, EPERM, ECONNABORTED, ESOCKTNOSUPPORT, EPROTONOSUPPORT, ETIMEDOUT, ERESTARTSYS.
½àµò
SVr4, 4.4BSD (accept ´Ø¿ô¤Ï BSD 4.2 ¤Ç½é¤á¤Æ¼ÂÁõ¤µ¤ì¤¿)¡£ BSD ¤Î man ¥Ú¡¼¥¸¤Ç¤Ï¡¢ 5 ¤Ä¤Î¥¨¥é¡¼¤¬ÊÖ¤µ¤ì¤¦¤ë¤È¤·¤Æ¤¤¤ë (EBADF, ENOTSOCK, EOPNOTSUPP, EWOULDBLOCK, EFAULT)¡£ SUSv2 ¤Ç¤Ï¡¢ EAGAIN, EBADF, ECONNABORTED, EFAULT, EINTR, EINVAL, EMFILE, ENFILE, ENOBUFS, ENOMEM, ENOSR, ENOTSOCK, EOPNOTSUPP, EPROTO, EWOULDBLOCK ¤¬¥¨¥é¡¼¤È¤·¤Æµ½Ò¤µ¤ì¤Æ¤¤¤ë¡£linux ¤Î accept ¤Ï O_NONBLOCK ¤Î¤è¤¦¤Ê¥Õ¥é¥°¤ò·Ñ¾µ¤·¤Ê¤¤¡£ ¤³¤ÎÆ°ºî¤Ï¾¤Î BSD ¥½¥±¥Ã¥È¤Î¼ÂÁõ¤È¤Ï°Û¤Ã¤Æ¤¤¤ë¡£ °Ü¿¢À¤ò¹Íθ¤·¤¿¥×¥í¥°¥é¥à¤Ç¤Ï¤³¤ÎÆ°ºî¤òÁ°Äó¤Ë¤»¤º¡¢ ¾ï¤Ë accept ¤è¤êÊÖ¤µ¤ì¤¿¥½¥±¥Ã¥È¤ËÂФ·¤ÆɬÍפʥե饰¤òÁ´¤Æ¤ò ÀßÄꤹ¤ë¤Ù¤¤Ç¤¢¤ë¡£
Ãí°Õ
accept ¤ÎÂè 3 °ú¿ô¤Ï¡¢¤â¤È¤â¤È `int *' ¤ÈÀë¸À¤µ¤ì¤Æ¤¤¤¿ (libc4 ¤ä libc5, BSD 4.*, SunOS 4, SGI ¤Ê¤É¿¤¯¤Î¥·¥¹¥Æ¥à¤Ç¤Ï¤½¤¦¤Ê¤Ã¤Æ¤¤¤ë)¡£ POSIX 1003.1g draft ɸ½à¤Ï¡¢ ¤³¤ì¤ò `size_t *' ¤ËÊѹ¹¤·¤è¤¦¤È¤·¡¢SunOS 5 ¤Ç¤Ï¤½¤¦Àë¸À¤µ¤ì¤Æ¤¤¤ë¡£ ¸å¤Ë POSIX draftis ¤Ë¤Ï `socklen_t *' ¤¬´Þ¤Þ¤ì¤ë¤è¤¦¤Ë¤Ê¤ê¡¢ Single Unix Specification ¤ä glibc2 ¤Ç¤Ï¤³¤Î¤è¤¦¤ËÀë¸À¤µ¤ì¤ë¤è¤¦¤Ë¤Ê¤Ã¤¿¡£ Linus Torvald ¤Îȯ¸À¤ò°úÍѤ¹¤ë: ¤Þ¤È¤â¤Ê¥é¥¤¥Ö¥é¥ê¤òºî¤ê¤¿¤±¤ì¤Ð¡¢ "socklen_t" ¤Î¥µ¥¤¥º¤Ï int ¤ÈƱ¤¸¤Ë¤·¤Ê¤¤ã¤Ê¤é¤Ê¤¤¡£ ¤µ¤â¤Ê¤¤¤È BSD ¥½¥±¥Ã¥ÈÁؤòÇ˲õ¤¹¤ë¤³¤È¤Ë¤Ê¤Ã¤Á¤ã¤¦¡£ POSIX ¤ÏºÇ½é¤³¤¤¤Ä¤ò size_t ¤Ë¤·¤¿¤ó¤Ç¡¢ ¤Ü¤¯¤ÏÈà¤é¤Ëʸ¶ç¤ò¤¬¤Ê¤ê¤¿¤Æ¤¿ (¿ʬ¾¤Ë¤â¤¤¤¿¤È»×¤¦¡£ ¤¢¤Þ¤ê¿¤¯¤Ï¤Ê¤«¤Ã¤¿¤í¤¦¤±¤É)¡£ ¤³¤¤¤Ä¤ò size_t ¤Ë¤¹¤ë¤Î¤Ï´°Á´¤Ë¤¤¤«¤ì¤Æ¤ë¡£ Î㤨¤Ð 64 ¥Ó¥Ã¥È¥¢¡¼¥¥Æ¥¯¥Á¥ã¤Ç¤Ï¡¢ size_t ¤¬ "int" ¤ÈƱ¤¸¥µ¥¤¥º¤À¤Ê¤ó¤Æ¤³¤È¤Ï¤Û¤È¤ó¤É¤Ê¤¤¤«¤é¤Í¡£ ¤³¤Î¥µ¥¤¥º¤Ï "int" ¤È Ʊ¤¸¤Ç¤Ê¤¤ã¤Ê¤é¤Ê¤¤¤ó¤À¡£ BSD ¥½¥±¥Ã¥È¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹¤Ã¤Æ¤¤¤¦¤Î¤Ï¤½¤¦¤¤¤¦¤â¤Î¤Ê¤ó¤À¤«¤é¤µ¡£ ¤Þ¤¢¤È¤â¤«¤¯ POSIX ¤Î¿Í¤¿¤Á¤â¡¢ "socklen_t" ¤òºî¤ë¤È¤¤¤¦²ò·èºö¤ò¤Ê¤ó¤È¤«¤Ò¤Í¤ê½Ð¤·¤¿¡£ ¤½¤â¤½¤âºÇ½é¤«¤éÊü¤Ã¤Æ¤ª¤±¤ÐÎɤ«¤Ã¤¿¤ó¤À¤¬¡¢ ¤½¤¤¤Ä¤Ë¤«¤«¤º¤é¤ï¤Ã¤Á¤ã¤Ã¤¿¤È¤¤Ë¡¢ ̾Á°ÉÕ¤¤Î·¿¤ò»ý¤¿¤»¤Ê¤¤ã¤Ê¤é¤Ê¤¤¡¢¤È»×¤Ã¤¿¤ß¤¿¤¤¤À¤Í¡£ ¤Ê¤ó¤Ç¤«¤Ï¤è¤¯¤ï¤«¤é¤Ê¤¤¤±¤É (¤¤Ã¤ÈºÇ½é¤Ë¤ä¤Ã¤Á¤Þ¤Ã¤¿Çϼ¯¤Ê´Ö°ã¤¤¤Ç´é¤ò¤Ä¤Ö¤·¤¿¤¯¤Ê¤«¤Ã¤¿¤«¤é¡¢ ¤³¤Ã¤½¤ê̾Á°¤òÉÕ¤±Âؤ¨¤Æ¼«Ê¬¤¿¤Á¤ÎÂ缺ÇÔ¤ò¤´¤Þ¤«¤½¤¦¤È¤·¤¿¤ó¤À¤í¤¦)¡£´ØÏ¢¹àÌÜ
bind(2), connect(2), listen(2), select(2), socket(2)