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[linuxjm/jm.git] / manual / LDP_man-pages / draft / man2 / accept.2

.\" Copyright (c) 1983, 1990, 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"     This product includes software developed by the University of
.\"     California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" Modified 1993-07-24 by Rik Faith <faith@cs.unc.edu>
.\" Modified 1996-10-21 by Eric S. Raymond <esr@thyrsus.com>
.\" Modified 1998-2000 by Andi Kleen to match Linux 2.2 reality
.\" Modified 2002-04-23 by Roger Luethi <rl@hellgate.ch>
.\" Modified 2004-06-17 by Michael Kerrisk <mtk.manpages@gmail.com>
.\" 2008-12-04, mtk, Add documentation of accept4()
.\"
.\" Japanese Version Copyright (c) 1998-2000 Shinya HANATAKA,
.\"   Takeshi Hakamada and NAKANO Takeo
.\"         all rights reserved.
.\" Translated 1998-04-06, Shinya HANATAKA <shinya@abyss.rim.or.jp>
.\"                        Takeshi Hakamada <hakamada@nsg.sgi.com>
.\" Updated & Modified 2000-10-12, NAKANO Takeo <nakano@apm.seikei.ac.jp
.\" Updated & Modified 2002-09-24, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated & Modified 2005-02-23, Akihiro MOTOKI
.\" Updated & Modified 2006-04-14, Akihiro MOTOKI, LDP v2.29
.\" Updated & Modified 2008-12-24, Akihiro MOTOKI, LDP v3.15
.\" Updated 2008-04-13, Akihiro MOTOKI, LDP v3.20
.\"
.\"WORD:        pending                 ÊÝαÃæ¤Î
.\"WORD:        queue                   ¥­¥å¡¼
.\"WORD:        file descriptor         ¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿
.\"WORD:        nonblocking             ÈóÄä»ß
.\"WORD:        async                   ÈóƱ´ü
.\"WORD:        communication layer     ÄÌ¿®ÁØ
.\"WORD:        value-result argument   Æþ½ÐÎÏξÍѤΰú¤­¿ô
.\"WORD:        confirmation            Àܳ³Îǧ
.\"WORD:        dequeue                 ¥­¥å¡¼¤«¤é¼è¤ê½Ð¤¹
.\"WORD:        rejection               ÀܳµñÈÝ
.\"
.TH ACCEPT 2 2009-02-23 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.\"O accept \- accept a connection on a socket
.SH ̾Á°
accept \- ¥½¥±¥Ã¥È¤Ø¤ÎÀܳ¤ò¼õ¤±¤ë
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
.\"O .BR "#include <sys/types.h>" "          /* See NOTES */"
.BR "#include <sys/types.h>" "          /* ¡ÖÃí°Õ¡×»²¾È */"
.B #include <sys/socket.h>

.BI "int accept(int " sockfd ", struct sockaddr *" addr ", socklen_t *" addrlen );

.B #define _GNU_SOURCE
.B #include <sys/socket.h>

.BI "int accept4(int " sockfd ", struct sockaddr *" addr ,
.BI "            socklen_t *" addrlen ", int " flags );
.fi
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O The
.\"O .BR accept ()
.\"O system call is used with connection-based socket types
.\"O .RB ( SOCK_STREAM ,
.\"O .BR SOCK_SEQPACKET ).
.BR accept ()
¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï¡¢Àܳ»Ø¸þ¤Î¥½¥±¥Ã¥È·¿
.RB ( SOCK_STREAM ", " SOCK_SEQPACKET )
¤ÇÍѤ¤¤é¤ì¤ë¡£
.\"O It extracts the first connection request on the queue of pending
.\"O connections for the listening socket,
.\"O .IR sockfd ,
.\"O creates a new connected socket, and returns a new file
.\"O descriptor referring to that socket.
¤³¤Î´Ø¿ô¤Ï¡¢ÀܳÂÔ¤Á¥½¥±¥Ã¥È
.I socket
°¸¤Æ¤ÎÊÝα¾õÂÖ¤ÎÀܳÍ׵᤬Æþ¤Ã¤Æ¤¤¤ë¥­¥å¡¼¤«¤é
ÀèƬ¤ÎÀܳÍ×µá¤ò¼è¤ê½Ð¤·¡¢ÀܳºÑ¤ß¥½¥±¥Ã¥È¤ò¿·µ¬¤ËÀ¸À®¤·¡¢
¤½¤Î¥½¥±¥Ã¥È¤ò»²¾È¤¹¤ë¿·¤·¤¤¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¤òÊÖ¤¹¡£
.\"O The newly created socket is not in the listening state.
¿·µ¬¤ËÀ¸À®¤µ¤ì¤¿¥½¥±¥Ã¥È¤Ï¡¢ÀܳÂÔ¤Á (listen) ¾õÂ֤ǤϤʤ¤¡£
.\"O The original socket
.\"O .I sockfd
.\"O is unaffected by this call.
¤â¤È¤â¤È¤Î¥½¥±¥Ã¥È
.I sockfd
¤Ï¤³¤Î¸Æ¤Ó½Ð¤·¤Ë¤è¤Ã¤Æ±Æ¶Á¤ò¼õ¤±¤Ê¤¤¡£
.PP
.\"O The argument
.\"O .I sockfd
.\"O is a socket that has been created with
.\"O .BR socket (2),
.\"O bound to a local address with
.\"O .BR bind (2),
.\"O and is listening for connections after a
.\"O .BR listen (2).
°ú¤­¿ô
.I sockfd
¤Ï¡¢
.BR socket (2)
¤Ë¤è¤Ã¤ÆÀ¸À®¤µ¤ì¡¢
.BR bind (2)
¤Ë¤è¤Ã¤Æ¥í¡¼¥«¥ë¥¢¥É¥ì¥¹¤Ë¥Ð¥¤¥ó¥É¤µ¤ì¡¢
.BR listen (2)
¤ò·Ð¤ÆÀܳ¤òÂԤäƤ¤¤ë¥½¥±¥Ã¥È¤Ç¤¢¤ë¡£

.\"O The argument
.\"O .I addr
.\"O is a pointer to a
.\"O .I sockaddr
.\"O structure.
.\"O This structure is filled in with the address of the peer socket,
.\"O as known to the communications layer.
.\"O The exact format of the address returned
.\"O .I addr
.\"O is determined by the socket's address family (see
.\"O .BR socket (2)
.\"O and the respective protocol man pages).
.I addr
°ú¤­¿ô¤Ï
.I sockaddr
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.I addr
°ú¤­¿ô¤ÇÊÖ¤µ¤ì¤ë¥¢¥É¥ì¥¹¤ÎÀµ³Î¤Ê¥Õ¥©¡¼¥Þ¥Ã¥È¤Ï¡¢
¥½¥±¥Ã¥È¤Î¥¢¥É¥ì¥¹¼ïÊ̤ˤè¤Ã¤ÆÊѤï¤ë
.RB ( socket (2)
¤ª¤è¤Ó¤½¤ì¤¾¤ì¤Î¥×¥í¥È¥³¥ë¤Î man ¥Ú¡¼¥¸¤ò»²¾È)¡£
.\"O When
.\"O .I addr
.\"O is NULL, nothing is filled in; in this case,
.\"O .I addrlen
.\"O is not used, and should also be NULL.
.I addr
¤¬ NULL ¤Î¾ì¹ç¡¢
.I addr
¤Ë¤Ï²¿¤âÆþ¤é¤Ê¤¤¡£¤³¤Î¾ì¹ç¡¢
.I addrlen
¤Ï»ÈÍѤµ¤ì¤º¡¢¤³¤Î°ú¤­¿ô¤Ï NULL ¤Ë¤·¤Æ¤ª¤¯¤Ù¤­¤Ç¤¢¤ë¡£

.\"O The
.\"O .I addrlen
.\"O argument is a value-result argument:
.\"O the caller must initialize it to contain the
.\"O size (in bytes) of the structure pointed to by
.\"O .IR addr ;
.\"O on return it will contain the actual size of the peer address.
.I addrlen
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.I addr
¤¬»Ø¤¹¹½Â¤ÂΤΥµ¥¤¥º (¥Ð¥¤¥Èñ°Ì) ¤Ç½é´ü²½¤·¤Æ¤ª¤«¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
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.\"O The returned address is truncated if the buffer provided is too small;
.\"O in this case,
.\"O .I addrlen
.\"O will return a value greater than was supplied to the call.
ÅϤµ¤ì¤¿¥Ð¥Ã¥Õ¥¡¤¬¾®¤µ²á¤®¤ë¾ì¹ç¤Ë¤Ï¡¢ÊÖ¤µ¤ì¤ë¥¢¥É¥ì¥¹¤ÎËöÈø¤Ï
ÀÚ¤êµÍ¤á¤é¤ì¤ë¡£¤³¤Î¾ì¹ç¤Ë¤Ï¡¢
.I addrlen
¤Ç¤Ï¡¢¸Æ¤Ó½Ð¤·»þ¤ËÅϤµ¤ì¤¿Ãͤè¤ê¤âÂ礭¤ÊÃͤ¬ÊÖ¤µ¤ì¤ë¡£
.PP
.\"O If no pending
.\"O connections are present on the queue, and the socket is not marked as
.\"O nonblocking,
.\"O .BR accept ()
.\"O blocks the caller until a connection is present.
.\"O If the socket is marked
.\"O nonblocking and no pending connections are present on the queue,
.\"O .BR accept ()
.\"O fails with the error
.\"O .BR EAGAIN
.\"O or
.\"O .BR EWOULDBLOCK .
¥­¥å¡¼¤ËÊÝα¤È¤Ê¤Ã¤Æ¤¤¤ëÀܳÍ׵᤬¤Ê¤¯¡¢
¤«¤Ä¥½¥±¥Ã¥È¤¬ÈóÄä»ß¤Ë¤Ê¤Ã¤Æ¤¤¤Ê¤¤¤È¤­¤Ï¡¢
.BR accept ()
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ÂÔ¤Á¾õÂÖ¤ÎÀܳÍ׵᤬¥­¥å¡¼¤Ë̵¤¤¤È¤­¤Ï¡¢
.BR accept ()
¤Ï¥¨¥é¡¼
.B EAGAIN
¤«
.B EWOULDBLOCK
¤Ç¼ºÇÔ¤¹¤ë¡£
.PP
.\"O In order to be notified of incoming connections on a socket, you can use
.\"O .BR select (2)
.\"O or
.\"O .BR poll (2).
.\"O A readable event will be delivered when a new connection is attempted and you
.\"O may then call
.\"O .BR accept ()
.\"O to get a socket for that connection.
.\"O Alternatively, you can set the socket to deliver
.\"O .B SIGIO
.\"O when activity occurs on a socket; see
.\"O .BR socket (7)
.\"O for details.
¥½¥±¥Ã¥È¤Ø¤ÎÀܳÅþÃå¤òÃΤë¤Ë¤Ï¡¢
.BR select (2)
¤Þ¤¿¤Ï
.BR poll (2)
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¤½¤¦¤·¤¿¤é
.BR accept ()
¤ò¸Æ¤ó¤Ç¤½¤ÎÀܳ¤ËÂФ¹¤ë¥½¥±¥Ã¥È¤ò¼èÆÀ¤¹¤ì¤Ð¤è¤¤¡£
¤¢¤ë¤¤¤Ï¥½¥±¥Ã¥È¤ËÀßÄê¤ò¹Ô¤¤¡¢²¿¤é¤«¤Î¥¢¥¯¥·¥ç¥ó¤¬¤¢¤Ã¤¿¤È¤­¤Ë
.B SIGIO
¤òÇÛÁ÷ (deliver) ¤µ¤»¤ë¤è¤¦¤Ë¤¹¤ë¤³¤È¤â¤Ç¤­¤ë¡£¾ÜºÙ¤Ï
.BR socket (7)
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.PP
.\"O For certain protocols which require an explicit confirmation,
.\"O such as
.\"O DECNet,
.\"O .BR accept ()
.\"O can be thought of as merely dequeuing the next connection request and not
.\"O implying confirmation.
.\"O Confirmation can be implied by
.\"O a normal read or write on the new file descriptor, and rejection can be
.\"O implied by closing the new socket.
.\"O Currently only
.\"O DECNet
.\"O has these semantics on Linux.
ÌÀ¼¨Åª¤ÊÀܳ³Îǧ (confirmation) ¤òɬÍפȤ¹¤ë¤è¤¦¤Ê¥×¥í¥È¥³¥ë
(DECNet ¤Ê¤É) ¤Ç¤Ï¡¢
.BR 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¥×¥¿¤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¡£

.\"O If
.\"O .IR flags
.\"O is 0, then
.\"O .BR accept4 ()
.\"O is the same as
.\"O .BR accept ().
.\"O The following values can be bitwise ORed in
.\"O .IR flags
.\"O to obtain different behavior:
.I flags
¤¬ 0 ¤Î¾ì¹ç¡¢
.BR accept4 ()
¤Ï
.BR accept ()
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.I flags
¤Ë°Ê²¼¤ÎÃͤò¥Ó¥Ã¥ÈËè¤ÎÏÀÍýÏ (OR) ¤Ç»ØÄꤹ¤ë¤³¤È¤Ç¡¢
°Û¤Ê¤ëÆ°ºî¤ò¤µ¤»¤ë¤³¤È¤¬¤Ç¤­¤ë¡£
.TP 16
.B SOCK_NONBLOCK
.\"O Set the
.\"O .BR O_NONBLOCK
.\"O file status flag on the new open file description.
.\"O Using this flag saves extra calls to
.\"O .BR fcntl (2)
.\"O to achieve the same result.
¿·¤·¤¯À¸À®¤µ¤ì¤ë¥ª¡¼¥×¥ó¥Õ¥¡¥¤¥ëµ­½Ò (open file description) ¤Î
.B O_NONBLOCK
¥Õ¥¡¥¤¥ë¥¹¥Æ¡¼¥¿¥¹¥Õ¥é¥°¤ò¥»¥Ã¥È¤¹¤ë¡£
¤³¤Î¥Õ¥é¥°¤ò»È¤¦¤³¤È¤Ç¡¢
.B O_NONBLOCK
¤ò¥»¥Ã¥È¤¹¤ë¤¿¤á¤Ë
.BR fcntl (2)
¤òÄɲäǸƤӽФ¹É¬Íפ¬¤Ê¤¯¤Ê¤ë¡£
.TP
.B SOCK_CLOEXEC
.\"O Set the close-on-exec
.\"O .RB ( FD_CLOEXEC )
.\"O flag on the new file descriptor.
.\"O See the description of the
.\"O .B O_CLOEXEC
.\"O flag in
.\"O .BR open (2)
.\"O for reasons why this may be useful.
¿·¤·¤¤¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤ËÂФ·¤Æ
close-on-exec
.RB ( FD_CLOEXEC )
¥Õ¥é¥°¤ò¥»¥Ã¥È¤¹¤ë¡£
¤³¤Î¥Õ¥é¥°¤¬Ìò¤ËΩ¤ÄÍýͳ¤Ë¤Ä¤¤¤Æ¤Ï¡¢
.BR open (2)
¤Î
.B O_CLOEXEC
¥Õ¥é¥°¤ÎÀâÌÀ¤ò»²¾È¤Î¤³¤È¡£
.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O On success,
.\"O these system calls return a nonnegative integer that is a descriptor
.\"O for the accepted socket.
.\"O On error, \-1 is returned, and
.\"O .I errno
.\"O is set appropriately.
À®¸ù¤·¤¿¾ì¹ç¡¢¤³¤ì¤é¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï
¼õ¤±ÉÕ¤±¤¿¥½¥±¥Ã¥È¤Î¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Ç¤¢¤ëÈóÉé¤ÎÀ°¿ôÃͤòÊÖ¤¹¡£
¥¨¥é¡¼¤¬È¯À¸¤·¤¿¾ì¹ç¤Ï \-1 ¤òÊÖ¤·¡¢
.I errno
¤òŬÀÚ¤ËÀßÄꤹ¤ë¡£
.\"O .SS "Error Handling"
.SS ¥¨¥é¡¼½èÍý
.\"O Linux
.\"O .BR accept ()
.\"O (and
.\"O .BR accept4 ())
.\"O passes already-pending network errors on the new socket
.\"O as an error code from
.\"O .BR accept ().
Linux ¤Î
.BR accept ()
(¤È
.BR accept4 ())
¤Ï¡¢¿·¤·¤¤¥½¥±¥Ã¥È¤Ë¤ª¤±¤ë¡¢È¯À¸ºÑ¤ß¤Î¥Í¥Ã¥È¥ï¡¼¥¯¥¨¥é¡¼¤ò
.BR accept ()
¤«¤é¤Î¥¨¥é¡¼¥³¡¼¥É¤È¤·¤ÆÅϤ¹¡£
.\"O This behavior differs from other BSD socket
.\"O implementations.
.\"O For reliable operation the application should detect
.\"O the network errors defined for the protocol after
.\"O .BR accept ()
.\"O and treat
.\"O them like
.\"O .B EAGAIN
.\"O by retrying.
.\"O In case of TCP/IP these are
¤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
.BR accept ()
¤Î¤¢¤È¤Ë¹Ô¤¤¡¢¤½¤ì¤é¤Î¥¨¥é¡¼¤ò
.B EAGAIN
¤ÈƱ¤¸¤è¤¦¤Ë°·¤¤¡¢ºÆ»î¹Ô (retry) ¤ò¹Ô¤¦¤Ù¤­¤Ç¤¢¤ë¡£
.\"O .BR ENETDOWN ,
.\"O .BR EPROTO ,
.\"O .BR ENOPROTOOPT ,
.\"O .BR EHOSTDOWN ,
.\"O .BR ENONET ,
.\"O .BR EHOSTUNREACH ,
.\"O .BR EOPNOTSUPP ,
.\"O and
.\"O .BR ENETUNREACH .
TCP/IP ¤Ç¤Ï¡¢°Ê²¼¤Î¥¨¥é¡¼¤¬³ºÅö¤¹¤ë:
.BR ENETDOWN ,
.BR EPROTO ,
.BR ENOPROTOOPT ,
.BR EHOSTDOWN ,
.BR ENONET ,
.BR EHOSTUNREACH ,
.BR EOPNOTSUPP ,
.B ENETUNREACH
.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.TP
.\"O .BR EAGAIN " or " EWOULDBLOCK
.BR EAGAIN " ¤Þ¤¿¤Ï " EWOULDBLOCK
.\" Actually EAGAIN on Linux
.\"O The socket is marked nonblocking and no connections are
.\"O present to be accepted.
.\"O POSIX.1-2001 allows either error to be returned for this case,
.\"O and does not require these constants to have the same value,
.\"O so a portable application should check for both possibilities.
¥½¥±¥Ã¥È¤¬ÈóÄä»ß¤Ë¤Ê¤Ã¤Æ¤¤¤Æ¡¢
¤«¤Ä¼õÉÕ¤±ÂоݤÎÀܳ¤¬Â¸ºß¤·¤Ê¤¤¡£
POSIX.1-2001 ¤Ï¡¢¤³¤Î¾ì¹ç¤Ë¤É¤Á¤é¤Î¥¨¥é¡¼¤òÊÖ¤¹¤³¤È¤âǧ¤á¤Æ¤ª¤ê¡¢
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³Îǧ¤¹¤Ù¤­¤Ç¤¢¤ë¡£
.TP
.B EBADF
.\"O The descriptor is invalid.
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.TP
.B ECONNABORTED
.\"O A connection has been aborted.
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.TP
.B EFAULT
.\"O The
.\"O .I addr
.\"O argument is not in a writable part of the user address space.
.I addr
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.TP
.B EINTR
.\"O The system call was interrupted by a signal that was caught
.\"O before a valid connection arrived; see
.\"O .BR signal (7).
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¥·¥¹¥Æ¥à¥³¡¼¥ë¤¬ÃæÃǤµ¤ì¤¿¡£
.BR signal (7)
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.TP
.B EINVAL
.\"O Socket is not listening for connections, or
.\"O .I addrlen
.\"O is invalid (e.g., is negative).
¥½¥±¥Ã¥È¤¬ÀܳÂÔ¤Á¾õÂ֤ǤϤʤ¤¡£¤â¤·¤¯¤Ï¡¢
.I addrlen
¤¬ÉÔÀµ¤Ç¤¢¤ë (Î㤨¤Ð¡¢Éé¤Î¾ì¹ç¤Ê¤É)¡£
.TP
.B EINVAL
.\"O .RB ( accept4 ())
.\"O invalid value in
.\"O .IR flags .
.RB ( accept4 ())
.I flags
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.TP
.B EMFILE
.\"O The per-process limit of open file descriptors has been reached.
1¥×¥í¥»¥¹¤¬¥ª¡¼¥×¥ó¤Ç¤­¤ë¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¿ô¤Î¾å¸Â¤Ë㤷¤¿¡£
.TP
.B ENFILE
.\"O The system limit on the total number of open files has been reached.
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.TP
.BR ENOBUFS ", " ENOMEM
.\"O Not enough free memory.
.\"O This often means that the memory allocation is limited by the socket buffer
.\"O limits, not by the system memory.
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.TP
.B ENOTSOCK
.\"O The descriptor references a file, not a socket.
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.TP
.B EOPNOTSUPP
.\"O The referenced socket is not of type
.\"O .BR SOCK_STREAM .
»²¾È¤·¤Æ¤¤¤ë¥½¥±¥Ã¥È¤Î·¿¤¬
.B SOCK_STREAM
¤Ç¤Ê¤¤¡£
.TP
.B EPROTO
.\"O Protocol error.
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.PP
.\"O In addition, Linux
.\"O .BR accept ()
.\"O may fail if:
¾åµ­¤Ë²Ã¤¨¤Æ¡¢Linux ¤Î
.BR accept ()
¤Ï°Ê²¼¤Î¥¨¥é¡¼¤Ç¼ºÇÔ¤¹¤ë:
.TP
.B EPERM
.\"O Firewall rules forbid connection.
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.PP
.\"O In addition, network errors for the new socket and as defined
.\"O for the protocol may be returned.
.\"O Various Linux kernels can
.\"O return other errors such as
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.BR ENOSR ,
.BR ESOCKTNOSUPPORT ,
.BR EPROTONOSUPPORT ,
.BR ETIMEDOUT .
.\"O The value
.\"O .B ERESTARTSYS
.\"O may be seen during a trace.
.B ERESTARTSYS
¤¬¥È¥ì¡¼¥¹¤ÎºÇÃæ¤Ë¸½¤ì¤ë¤³¤È¤â¤¢¤ë¡£
.\"O .SH VERSIONS
.SH ¥Ð¡¼¥¸¥ç¥ó
.\"O The
.\"O .BR accept4 ()
.\"O system call is available starting with Linux 2.6.28;
.\"O support in glibc is available starting with version 2.10.
.BR accept4 ()
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glibc ¤Ç¤Î¥µ¥Ý¡¼¥È¤Ï¥Ð¡¼¥¸¥ç¥ó 2.10 °Ê¹ß¤ÇÍøÍѲÄǽ¤Ç¤¢¤ë¡£
.\"O .SH CONFORMING TO
.SH ½àµò
.\"O .BR accept ():
.\"O POSIX.1-2001,
.\"O SVr4, 4.4BSD,
.\"O .RB ( accept ()
.\"O first appeared in 4.2BSD).
.\"O .\" The BSD man page documents five possible error returns
.\"O .\" (EBADF, ENOTSOCK, EOPNOTSUPP, EWOULDBLOCK, EFAULT).
.\"O .\" POSIX.1-2001 documents errors
.\"O .\" EAGAIN, EBADF, ECONNABORTED, EINTR, EINVAL, EMFILE,
.\"O .\" ENFILE, ENOBUFS, ENOMEM, ENOTSOCK, EOPNOTSUPP, EPROTO, EWOULDBLOCK.
.\"O .\" In addition, SUSv2 documents EFAULT and ENOSR.
.BR accept ():
POSIX.1-2001,
SVr4, 4.4BSD,
.RB ( accept ()
¤Ï 4.2BSD ¤Ç½é¤á¤Æ¼ÂÁõ¤µ¤ì¤¿).
.\" BSD ¤Î man ¥Ú¡¼¥¸¤Ë¤Ï¡¢ 5 ¤Ä¤Î¥¨¥é¡¼¤¬ÊÖ¤µ¤ì¤¦¤ë¤È½ñ¤«¤ì¤Æ¤¤¤ë
.\" (EBADF, ENOTSOCK, EOPNOTSUPP, EWOULDBLOCK, EFAULT)¡£
.\" POSIX.1-2001 ¤Ç¤Ï¡¢
.\" EAGAIN, EBADF, ECONNABORTED, EINTR, EINVAL, EMFILE,
.\" ENFILE, ENOBUFS, ENOMEM, ENOTSOCK, EOPNOTSUPP, EPROTO, EWOULDBLOCK
.\" ¤¬¥¨¥é¡¼¤È¤·¤Æµ­½Ò¤µ¤ì¤Æ¤¤¤ë¡£
.\" ¤µ¤é¤Ë¡¢SUSv2 ¤Ë¤Ï EFAULT, ENOSR ¤âµ­½Ò¤µ¤ì¤Æ¤¤¤ë¡£

.\"O .BR accept4 ()
.\"O is a nonstandard Linux extension.
.BR accept4 ()
¤ÏÈóɸ½à¤Î Linux ¤Ë¤è¤ë³ÈÄ¥¤Ç¤¢¤ë¡£
.LP
.\"O On Linux, the new socket returned by
.\"O .BR accept ()
.\"O does \fInot\fP inherit file status flags such as
.\"O .B O_NONBLOCK
.\"O and
.\"O .B O_ASYNC
.\"O from the listening socket.
.\"O This behavior differs from the canonical BSD sockets implementation.
.\"O .\" Some testing seems to show that Tru64 5.1 and HP-UX 11 also
.\"O .\" do not inherit file status flags -- MTK Jun 05
.\"O Portable programs should not rely on inheritance or noninheritance
.\"O of file status flags and always explicitly set all required flags on
.\"O the socket returned from
.\"O .BR accept ().
Linux ¤Ç¤Ï¡¢
.BR accept ()
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.RB ( O_NONBLOCK
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.B O_ASYNC
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¤³¤ÎÆ°ºî¤Ïɸ½àŪ¤Ê BSD ¥½¥±¥Ã¥È¤Î¼ÂÁõ¤È¤Ï°Û¤Ê¤Ã¤Æ¤¤¤ë¡£
.\" ¤¤¤¯¤Ä¤«¼Â¸³¤·¤¿¤È¤³¤í¤Ç¤Ï Tru64 5.1 ¤È HP-UX 11 ¤â
.\" ¥Õ¥¡¥¤¥ë¾õÂ֥ե饰¤ò·Ñ¾µ¤·¤Ê¤¤¤è¤¦¤Ç¤¢¤ë¡£ -- MTK Jun 05
°Ü¿¢À­¤ò¹Íθ¤·¤¿¥×¥í¥°¥é¥à¤Ç¤Ï¥Õ¥¡¥¤¥ë¾õÂ֥ե饰¤¬·Ñ¾µ¤µ¤ì¤ë¤«¤É¤¦¤«¤Ï
Á°Äó¤Ë¤»¤º¡¢¾ï¤Ë
.BR accept ()
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.\"O .SH NOTES
.SH Ãí°Õ
.\"O POSIX.1-2001 does not require the inclusion of
.\"O .IR <sys/types.h> ,
.\"O and this header file is not required on Linux.
.\"O However, some historical (BSD) implementations required this header
.\"O file, and portable applications are probably wise to include it.
POSIX.1-2001 ¤Ç¤Ï
.I <sys/types.h>
¤Î¥¤¥ó¥¯¥ë¡¼¥É¤Ïɬ¿Ü¤È¤µ¤ì¤Æ¤ª¤é¤º¡¢
Linux ¤Ç¤Ï¤³¤Î¥Ø¥Ã¥À¥Õ¥¡¥¤¥ë¤ÏɬÍפǤϤʤ¤¡£
¤·¤«¤·¡¢Îò»ËŪ¤Ë¤Ï¡¢¤¤¤¯¤Ä¤«¤Î¼ÂÁõ (BSD ·Ï) ¤Ç¤³¤Î¥Ø¥Ã¥À¥Õ¥¡¥¤¥ë¤¬
ɬÍפǤ¢¤ê¡¢°Ü¿¢À­¤¬É¬Íפʥ¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ç¤Ï¤³¤Î¥Õ¥¡¥¤¥ë¤ò
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.\"O There may not always be a connection waiting after a
.\"O .B SIGIO
.\"O is delivered or
.\"O .BR select (2)
.\"O or
.\"O .BR poll (2)
.\"O return a readability event because the connection might have been
.\"O removed by an asynchronous network error or another thread before
.\"O .BR accept ()
.\"O is called.
.B SIGIO
¤¬ÆϤ±¤é¤ì¤¿¸å¤ä¡¢
.BR select (2)
¤Þ¤¿¤Ï
.BR poll (2)
¤¬Æɤ߹þ¤ß²Äǽ¥¤¥Ù¥ó¥È¤òÊÖ¤·¤¿¸å¤Ë¡¢
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¤Ê¤¼¤Ê¤é¤½¤ÎÀܳ¤Ï¡¢
.BR 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
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.\"O If this happens then the call will block waiting for the next
.\"O connection to arrive.
.\"O To ensure that
.\"O .BR accept ()
.\"O never blocks, the passed socket
.\"O .I sockfd
.\"O needs to have the
.\"O .B O_NONBLOCK
.\"O flag set (see
.\"O .BR socket (7)).
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.BR accept ()
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.BR accept ()
¤ËÄä»ß¤ò¹Ô¤ï¤»¤Ê¤¤¤è¤¦¤Ë¤¹¤ë¤Ë¤Ï¡¢°ú¤­¿ô¤ËÅϤ¹¥½¥±¥Ã¥È
.I sockfd
¤Ë
.B O_NONBLOCK
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.RB ( socket (7)
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.\"O .SS The socklen_t type
.SS socklen_t ·¿
.\"O The third argument of
.\"O .BR accept ()
.\"O was originally declared as an \fIint *\fP (and is that under libc4 and libc5
.\"O and on many other systems like 4.x BSD, SunOS 4, SGI); a POSIX.1g draft
.\"O standard wanted to change it into a \fIsize_t *\fP, and that is what it is
.\"O for SunOS 5.
.BR accept ()
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.\"O Later POSIX drafts have \fIsocklen_t *\fP,
.\"O and so do the Single Unix Specification and glibc2.
¸å¤Ë POSIX drafts ¤Ë¤Ï \fIsocklen_t *\fP ¤¬´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¤¿¡£
.\"O Quoting Linus Torvalds:
Linus Torvald ¤Îȯ¸À¤ò°úÍѤ¹¤ë:

.\" .I fails: only italicizes a single line
.\"O "_Any_ sane library _must_ have "socklen_t" be the same size
.\"O as int.
.\"O Anything else breaks any BSD socket layer stuff.
.\"O POSIX initially \fIdid\fP make it a size_t, and I (and hopefully others, but
.\"O obviously not too many) complained to them very loudly indeed.
.\"O Making it a size_t is completely broken, exactly because size_t very
.\"O seldom is the same size as "int" on 64-bit architectures, for example.
.\"O And it
.\"O \fIhas\fP to be the same size as "int" because that's what the BSD socket
.\"O interface is.
.\"O Anyway, the POSIX people eventually got a clue, and created "socklen_t".
.\"O They shouldn't have touched it in the first place, but once they did
.\"O they felt it had to have a named type for some unfathomable reason
.\"O (probably somebody didn't like losing face over having done the original
.\"O stupid thing, so they silently just renamed their blunder)."
¡Ö¤Þ¤È¤â¤Ê¥é¥¤¥Ö¥é¥ê¤òºî¤ê¤¿¤±¤ì¤Ð¡¢ "socklen_t"
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.\"O .SH EXAMPLE
.SH Îã
.\"O See
.\"O .BR bind (2).
.BR bind (2)
»²¾È¡£
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR bind (2),
.BR connect (2),
.BR listen (2),
.BR select (2),
.BR socket (2),
.BR socket (7)