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.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" 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>
.\"
.\" 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, Catch up to LDP v2.29
.\"
.\"WORD:	pending			α
.\"WORD:	queue			塼
.\"WORD:	file descriptor		ե롦ǥץ
.\"WORD:	non-blocking		
.\"WORD:	async			Ʊ
.\"WORD:	communication layer	̿
.\"WORD:	value-result argument	ξѤΰ
.\"WORD:	confirmation		³ǧ
.\"WORD:	dequeue			塼Ф
.\"WORD:	rejection		³
.\"
.TH ACCEPT 2 2004-06-17 "Linux" "Linux Programmer's Manual"
.SH ̾
accept \- åȤؤ³
.SH 
.BR "#include <sys/types.h>" "          /* ա׻ */"
.br
.B #include <sys/socket.h>
.sp
.BI "int accept(int " sockfd ", struct sockaddr *" addr ", socklen_t *" addrlen );
.SH 
.BR accept ()
ƥॳϡ³ظΥåȷ
.RB ( SOCK_STREAM ", " SOCK_SEQPACKET )
Ѥ롣
δؿϡα֤³׵᤬äƤ륭塼
Ƭ³׵Ф³ѤߥåȤ򿷵
ΥåȤ򻲾Ȥ뿷ե롦ǥץ֤
줿åȤϡ³Ԥ (listen) ֤ǤϤʤ
ȤȤΥå
.I sockfd
ϤθƤӽФˤäƱƶʤ
.PP

.I sockfd
ϡ
.BR socket (2)
ˤä졢
.BR bind (2)
ˤäƥ륢ɥ쥹˥Хɤ졢
.BR listen (2)
Ф³ԤäƤ륽åȤǤ롣

.I addr

.I sockaddr
¤ΤؤΥݥ󥿤Ǥ롣
ι¤Τˤ³ΥåȤΥɥ쥹äƤ롣
.I addr
֤륢ɥ쥹ΤʥեޥåȤϡ
åȤΥɥ쥹̤ˤäѤ
.RB ( socket (2)
Ӥ줾Υץȥ man ڡ򻲾)
.I addrlen
ξѤΰǡ
ǽ
.I addr
ݥȤ빽¤ΤΥǼƤ롣
꥿ˤϡ֤줿ɥ쥹μºݤĹ (Хñ) 롣
.I addr
 NULL λϲʤ
.PP
塼αȤʤäƤ³׵᤬ʤ
ĥåȤߤˤʤäƤʤȤϡ
.BR accept ()
³ȯޤǸƤӽФ (block) 롣
åȤߤˤʤäƤơ
Ԥ֤³׵᤬塼̵Ȥϡ
.BR accept ()

.B EAGAIN
顼ǼԤ롣
.PP
åȤؤ³Τˤϡ
.BR select (2)
ޤ
.BR poll (2)
ѤФ褤
³׵᤬ȥåȤɤ߹߲ǽˤʤΤǡ

.BR accept ()
ƤǤ³Ф륽åȤФ褤
뤤ϥåȤԤ餫Υ󤬤äȤ
.B SIGIO
 (deliver) 褦ˤ뤳ȤǤ롣ܺ٤
.BR socket (7)
򻲾ȤΤȡ
.PP
Ū³ǧ (confirmation) ɬפȤ褦ʥץȥ
(DECNet ʤ) Ǥϡ
.BR accept ()
ñ˼³׵򥭥塼ФǤꡢ
³ǧϹԤʤȤդ衣³ǧϡ
ե롦ǥץФ
̾ɤ߼/񤭹ߤˤäƤʤ졢³ (rejection)
ϿåȤ򥯥뤳ȤˤäƤʤ롣
ߤΤȤ
Linux ǤΥޥƥĤΤ DECNet Ǥ롣
.SH ֤
硢
.BR accept ()
ϼդåȤΥǥץǤ֤ͤ
顼ȯ \-1 ֤
.I errno
Ŭڤꤹ롣
.SS 顼
Linux 
.BR accept ()
ϡåȤˤ롢ȯѤߤΥͥåȥ顼
.BR accept ()
Υ顼ɤȤϤ
ο񤤤 BSD åȤμȤϰۤʤ롣
ι⤤ưԤˤϡ
ץꥱϥץȥƤͥåȥ顼θΤ
.BR accept ()
ΤȤ˹ԤΥ顼
.B EAGAIN
Ʊ褦˰ƻ (retry) Ԥ٤Ǥ롣
TCP/IP ǤϡʲΥ顼:
.BR ENETDOWN ,
.BR EPROTO ,
.BR ENOPROTOOPT ,
.BR EHOSTDOWN ,
.BR ENONET ,
.BR EHOSTUNREACH ,
.BR EOPNOTSUPP ,
.B ENETUNREACH
.SH 顼
.BR accept ()
ϰʲΥ顼ǼԤ:
.TP
.BR EAGAIN " ޤ " EWOULDBLOCK
åȤߤˤʤäƤơ
ļդоݤ³¸ߤʤ
.TP
.B EBADF
ǥץ
.TP
.B ECONNABORTED
³ߤ줿
.TP
.B EINTR
ͭ³夹ª줿ʥˤä
ƥॳ뤬Ǥ줿
.TP
.B EINVAL
åȤ³Ԥ֤ǤϤʤ⤷ϡ
.I addrlen
Ǥ (㤨Сξʤ)
.TP
.B EMFILE
1ץץǤե롦ǥץξ¤ã
.TP
.B ENFILE
ץ󤵤줿եƥΤξ¤ã
.TP
.B ENOTSOCK
ǥץϥåȤǤϤʤե򻲾ȤƤ롣
.TP
.B EOPNOTSUPP
ȤƤ륽åȤη
.B SOCK_STREAM
Ǥʤ
.PP
.BR accept ()
ϰʲΥ顼ǼԤ뤳Ȥ:
.TP
.B EFAULT
.I addr
桼ɥ쥹֤ν񤭹߲ǽΰˤʤ
.TP
.BR ENOBUFS ", " ENOMEM
꤬­ʤ
¿ξϡƥ꤬­ʤ櫓ǤϤʤ
åȥХåե礭ˤƤ¤Ǥ롣
.TP
.B EPROTO
ץȥ롦顼
.PP
Linux 
.BR accept ()
ϰʲΥ顼ǼԤ:
.TP
.B EPERM
եΥ롼ˤ³ػߤ줿
.PP
¾ˡåȤФͥåȥ顼֤뤳Ȥ⤢롣
Ϥ줾ΥץȥƤ롣
 Linux ͥǤϡ
ʲ˼褦ʥ顼֤Ȥ⤢롣
.BR ENOSR ,
.BR ESOCKTNOSUPPORT ,
.BR EPROTONOSUPPORT ,
.BR ETIMEDOUT .
.B ERESTARTSYS
ȥ졼κ˸뤳Ȥ⤢롣
.SH 
SVr4, 4.4BSD,
.RB ( accept ()
 4.2BSD ǽƼ줿), POSIX.1-2001.
.\" BSD  man ڡˤϡ 5 ĤΥ顼֤줦Ƚ񤫤Ƥ
.\" (EBADF, ENOTSOCK, EOPNOTSUPP, EWOULDBLOCK, EFAULT)
.\" POSIX.1-2001 Ǥϡ
.\" EAGAIN, EBADF, ECONNABORTED, EINTR, EINVAL, EMFILE,
.\" ENFILE, ENOBUFS, ENOMEM, ENOTSOCK, EOPNOTSUPP, EPROTO, EWOULDBLOCK
.\" 顼ȤƵҤƤ롣
.\" ˡSUSv2 ˤ EFAULT, ENOSR ⵭ҤƤ롣
.LP
Linux Ǥϡ
.BR accept ()
֤åȤ listen ԤäƤ륽åȤ
ե֥ե饰
.RB ( O_NONBLOCK

.B O_ASYNC
ʤ) Ѿ֤ʤס
ưɸŪ BSD åȤμȤϰۤʤäƤ롣
.\" Ĥ¸ȤǤ Tru64 5.1  HP-UX 11 
.\" ե֥ե饰Ѿʤ褦Ǥ롣 -- MTK Jun 05
ܿθץǤϥե֥ե饰Ѿ뤫ɤ
ˤ
.BR accept ()
֤åȤФƤɬפʥե饰Ūꤹ褦
٤Ǥ롣

.SH 
POSIX.1-2001 Ǥ
.I <sys/types.h>
Υ󥯥롼ɤɬܤȤƤ餺
Linux ǤϤΥإåեɬפǤϤʤ
ŪˤϡĤμ (BSD ) ǤΥإåե뤬
ɬפǤꡢܿɬפʥץꥱǤϤΥե
󥯥롼ɤΤǤ

.B SIGIO
Ϥ줿䡢
.BR select (2)
ޤ
.BR poll (2)
ɤ߹߲ǽ٥Ȥ֤ˡ
ɬԵ³Ȥϸ¤ʤ
ʤʤ餽³ϡ
.BR accept ()
ƤФˡƱŪʥͥåȥ顼
¾ΥåɤƤФ줿 (̤) accept ˤä
Ƥ뤫⤷ʤǤ롣
ξ硢
.BR accept ()
ƤӽФ (block) ³ԤĤŤ롣
.BR accept ()
ߤԤ碌ʤ褦ˤˤϡϤå
.I sockfd

.B O_NONBLOCK
ե饰򥻥åȤƤɬפ
.RB ( socket (7)
򸫤)
.SS socklen_t 
.BR accept ()
 3 ϡȤ \fIint *\fP Ƥ
(libc4  libc5, 4.x BSD, SunOS 4, SGI ʤ¿ΥƥǤϤʤäƤ)
POSIX.1g draft ɸϡ
 \fIsize_t *\fP ѹ褦ȤSunOS 5 ǤϤƤ롣
 POSIX drafts ˤ \fIsocklen_t *\fP ޤޤ褦ˤʤꡢ
Single Unix Specification  glibc2 ǤϤΤ褦褦ˤʤä
Linus Torvald ȯѤ:

.\" .I fails: only italicizes a single line
֤ޤȤʥ饤֥ꤿС "socklen_t"
Υ int Ʊˤʤʤʤ
ʤ BSD åؤ˲뤳Ȥˤʤä㤦
POSIX Ϻǽ餳Ĥ size_t ˤǡ
ܤʸ򤬤ʤꤿƤ
(¿ʬͤ¾ˤ⤤Ȼפ¿Ϥʤä褦)
Ĥ size_t ˤΤϴˤƤ롣
㤨 64 ӥåȥƥǤϡ
size_t  "int" ƱʤƤȤϤۤȤɤʤ͡
Υ "int"  ƱǤʤإ٤ʤ
BSD åȥ󥿡եäƤΤϤΤʤ顣
ޤȤ⤫ POSIX οͤ⡢
"socklen_t" ȤʤȤҤͤФ
⤽ǽ餫äƤɤä
ääʾ塢
̾դηʤʤʤȻפäߤ͡
ʤǤϤ狼ʤ
(äȺǽˤäޤäϼʴְ㤤ǴĤ֤ʤä顢
ä̾դؤƼʬ缺Ԥ򤴤ޤȤ)
.SH 
.BR bind (2)
ȡ
.SH Ϣ
.BR bind (2),
.BR connect (2),
.BR listen (2),
.BR select (2),
.BR socket (2)