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

.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
.\" Portions extracted from /usr/include/sys/socket.h, which does not have
.\" any authorship information in it.  It is probably available under the GPL.
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date.  The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein.  The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\"
.\" Other portions are from the 6.9 (Berkeley) 3/10/91 man page:
.\"
.\" Copyright (c) 1983 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 1997-01-31 by Eric S. Raymond <esr@thyrsus.com>
.\" Modified 1998, 1999 by Andi Kleen
.\" Modified 2004-06-23 by Michael Kerrisk <mtk.manpages@gmail.com>
.\"
.\" Japanese Version Copyright (c) 1996 Yosiaki Yanagihara
.\"         all rights reserved.
.\" Translated 1996-06-25, Yosiaki Yanagihara <yosiaki@bsd2.kbnes.nec.co.jp>
.\" Updated & Modified 1997-11-06, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated & Modified 1999-08-14, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated & Modified 2000-01-13, Kentaro Shirakata <argrath@yo.rim.or.jp>
.\" Updated & Modified 2005-02-23, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated & Modified 2005-10-05, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.TH CONNECT 2 2008-12-03 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O connect \- initiate a connection on a socket
connect \- ¥½¥±¥Ã¥È¤ÎÀܳ¤ò¹Ô¤¦
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
.\"O .BR "#include <sys/types.h>" "          /* See NOTES */"
.BR "#include <sys/types.h>" "          /* ¡ÖÃí°Õ¡×»²¾È */"
.br
.B #include <sys/socket.h>
.sp
.BI "int connect(int " sockfd ", const struct sockaddr *" addr ,
.BI "            socklen_t " addrlen );
.fi
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O The
.\"O .BR connect ()
.\"O system call connects the socket referred to by the file descriptor
.\"O .I sockfd
.\"O to the address specified by
.\"O .IR addr .
.\"O The
.\"O .I addrlen
.\"O argument specifies the size of
.\"O .IR addr .
.\"O The format of the address in
.\"O .I addr
.\"O is determined by the address space of the socket
.\"O .IR sockfd ;
.\"O see
.\"O .BR socket (2)
.\"O for further details.
.BR connect ()
¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï¡¢¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿
.I sockfd
¤¬»²¾È¤·¤Æ¤¤¤ë¥½¥±¥Ã¥È¤ò
.I addr
¤Ç»ØÄꤵ¤ì¤¿¥¢¥É¥ì¥¹¤ËÀܳ¤¹¤ë¡£
.I addrlen
°ú¤­¿ô¤Ï
.I addr
¤ÎÂ礭¤µ¤ò¼¨¤¹¡£
.I addr
¤Î¥¢¥É¥ì¥¹¤Î¥Õ¥©¡¼¥Þ¥Ã¥È¤Ï¥½¥±¥Ã¥È
.I sockfd
¤Î¥¢¥É¥ì¥¹¶õ´Ö¤Ë¤è¤ê°Û¤Ê¤ë¡£
¤µ¤é¤Ê¤ë¾ÜºÙ¤Ï
.BR socket (2)
¤ò»²¾È¤Î¤³¤È¡£

.\"O If the socket
.\"O .I sockfd
.\"O is of type
.\"O .B SOCK_DGRAM
.\"O then
.\"O .I addr
.\"O is the address to which datagrams are sent by default, and the only
.\"O address from which datagrams are received.
.\"O If the socket is of type
.\"O .B SOCK_STREAM
.\"O or
.\"O .BR SOCK_SEQPACKET ,
.\"O this call attempts to make a connection to the socket that is bound
.\"O to the address specified by
.\"O .IR addr .
¥½¥±¥Ã¥È
.I sockfd
¤¬
.B SOCK_DGRAM
·¿¤Ç¤¢¤ì¤Ð¡¢
.I addr
¤Ï¡¢¥Ç¥Õ¥©¥ë¥È¤Î¥Ç¡¼¥¿¥°¥é¥à¤ÎÁ÷¿®Àè¤Î¥¢¥É¥ì¥¹¤Ç¤¢¤ê¡¢
¥Ç¡¼¥¿¥°¥é¥à¤ò¼õ¿®¤¹¤ëÍ£°ì¤Î¥¢¥É¥ì¥¹¤ò¼¨¤¹¤Ë²á¤®¤Ê¤¤¡£
¥½¥±¥Ã¥È¤¬
.B SOCK_STREAM
·¿¤â¤·¤¯¤Ï
.B SOCK_SEQPACKET
·¿¤Ç¤¢¤ì¤Ð¡¢¤³¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï
.I addr
¤Ç»ØÄꤵ¤ì¤¿¥¢¥É¥ì¥¹¤Ë·ë¤ÓÉÕ¤±¤é¤ì¤¿¥½¥±¥Ã¥È¤ËÂФ¹¤ëÀܳ¤Î
ºîÀ®¤ò»î¤ß¤ë¡£
.PP
.\"O Generally, connection-based protocol sockets may successfully
.\"O .BR connect ()
.\"O only once; connectionless protocol sockets may use
.\"O .BR connect ()
.\"O multiple times to change their association.
.\"O Connectionless sockets may
.\"O dissolve the association by connecting to an address with the
.\"O .I sa_family
.\"O member of
.\"O .I sockaddr
.\"O set to
.\"O .BR AF_UNSPEC
.\"O (supported on Linux since kernel 2.2).
°ìÈÌŪ¤Ë¡¢Àܳ»Ø¸þ (connection-oriented) ¥×¥í¥È¥³¥ë¤Ç¤Ï°ìÅÙ¤À¤±
.BR connect ()
¤¬À®¸ù¤¹¤ë¡£
ÈóÀܳ (connectionless) ¥×¥í¥È¥³¥ë¤Ç¤ÏÂбþ¤òÊѹ¹¤¹¤ë¤¿¤á¤Ë²¿ÅÙ¤â
.BR connect ()
¤ò»ÈÍѤǤ­¤ë¡£
ÈóÀܳ¥½¥±¥Ã¥È¤Ï
.I sockaddr
¤Î
.I sa_family
¥á¥ó¥Ð¤Ë
.B AF_UNSPEC
¤òÀßÄꤹ¤ë¤³¤È¤Ç¡¢Àܳ¥¢¥É¥ì¥¹¤ÎÂбþ¤ò²ò¾Ã¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë
.RB ( AF_UNSPEC
¤Ï¥«¡¼¥Í¥ë 2.2 °Ê¹ß¤Î Linux ¤Ç¥µ¥Ý¡¼¥È)¡£
.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O If the connection or binding succeeds, zero is returned.
.\"O On error, \-1 is
.\"O returned, and
.\"O .I errno
.\"O is set appropriately.
Àܳ¤Þ¤¿¤ÏÂбþ¤Å¤±¤ËÀ®¸ù¤¹¤ë¤È¥¼¥í¤òÊÖ¤¹¡£
¼ºÇÔ¤¹¤ë¤È \-1 ¤òÊÖ¤·¡¢
.I errno
¤ËŬÀÚ¤ÊÃͤòÀßÄꤹ¤ë¡£
.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.\"O The following are general socket errors only.
.\"O There may be other domain-specific error codes.
°Ê²¼¤Ï°ìÈÌŪ¤Ê¥½¥±¥Ã¥È¤Ë¤Ä¤¤¤Æ¤Î¥¨¥é¡¼¤Ç¤¢¤ë¡£Â¾¤Ë¥É¥á¥¤¥óÆÃÍ­¤Î¥¨¥é¡¼
¤¬È¯À¸¤¹¤ë²ÄǽÀ­¤¬¤¢¤ë¡£
.TP
.B EACCES
.\"O For Unix domain sockets, which are identified by pathname:
.\"O Write permission is denied on the socket file,
.\"O or search permission is denied for one of the directories
.\"O in the path prefix.
.\"O (See also
.\"O .BR path_resolution (7).)
Unix ¥É¥á¥¤¥ó¥½¥±¥Ã¥È¤Ï¥Ñ¥¹Ì¾¤Ç¼±Ê̤µ¤ì¤ë¡£
¥½¥±¥Ã¥È¡¦¥Õ¥¡¥¤¥ë¤Ø¤Î½ñ¤­¹þ¤ßµö²Ä¤¬¤Ê¤«¤Ã¤¿¤«¡¢¥Ñ¥¹Ì¾¤Ø
Åþ㤹¤ë¤Þ¤Ç¤Î¥Ç¥£¥ì¥¯¥È¥ê¤Î¤¤¤º¤ì¤«¤ËÂФ¹¤ë¸¡º÷µö²Ä¤¬¤Ê¤«¤Ã¤¿¡£
.RB ( path_resolution (7)
¤â»²¾È¤Î¤³¤È)
.TP
.BR EACCES ", " EPERM
.\"O The user tried to connect to a broadcast address without having the socket
.\"O broadcast flag enabled or the connection request failed because of a local
.\"O firewall rule.
¥½¥±¥Ã¥È¤Î¥Ö¥í¡¼¥É¥­¥ã¥¹¥È¡¦¥Õ¥é¥°¤¬Í­¸ú¤Ë¤Ê¤Ã¤Æ¤¤¤Ê¤¤¤Î¤Ë
¥æ¡¼¥¶¤¬¥Ö¥í¡¼¥É¥­¥ã¥¹¥È¤ØÀܳ¤ò»î¤ß¤¿¡£¤Þ¤¿¤Ï¡¢¥í¡¼¥«¥ë¤Î¥Õ¥¡¥¤¥¢¥¦¥©¡¼¥ë¤Î
µ¬Â§¤Ë¤è¤êÀܳ¤ÎÍ׵᤬¼ºÇÔ¤·¤¿¡£
.TP
.B EADDRINUSE
.\"O Local address is already in use.
¥í¡¼¥«¥ë¥¢¥É¥ì¥¹¤¬´û¤Ë»ÈÍѤµ¤ì¤Æ¤¤¤ë¡£
.TP
.B EAFNOSUPPORT
.\"O The passed address didn't have the correct address family in its
.\"O .I sa_family
.\"O field.
ÅϤµ¤ì¤¿¥¢¥É¥ì¥¹¤Î
.I sa_family
¥Õ¥£¡¼¥ë¥É¤¬Àµ¤·¤¤¥¢¥É¥ì¥¹¡¦¥Õ¥¡¥ß¥ê¡¼¤Ç¤Ï¤Ê¤¤¡£
.TP
.B EAGAIN
.\"O No more free local ports or insufficient entries in the routing cache.
.\"O For
.\"O .B AF_INET
.\"O see the description of
.\"O .I /proc/sys/net/ipv4/ip_local_port_range
.\"O .BR ip (7)
.\"O for information on how to increase the number of local ports.
»ÈÍѲÄǽ¤Ê¥í¡¼¥«¥ë¤Î¥Ý¡¼¥È¤¬¤Ê¤¤¤«¡¢
¥ë¡¼¥Æ¥£¥ó¥°¥­¥ã¥Ã¥·¥å¤Ë½½Ê¬¤Ê¥¨¥ó¥È¥ê¤¬¤Ê¤¤¡£
.B AF_INET
¤Î¾ì¹ç¤Ë¡¢¥í¡¼¥«¥ë¥Ý¡¼¥È¤Î¿ô¤òÁý¤ä¤¹ÊýË¡¤Ë¤Ä¤¤¤Æ¤Ï¡¢
.BR ip (7)
¤Î
.I /proc/sys/net/ipv4/ip_local_port_range
¤ÎÀâÌÀ¤ò»²¾È¤Î¤³¤È¡£
.TP
.B EALREADY
.\"O The socket is nonblocking and a previous connection attempt has not yet
.\"O been completed.
¥½¥±¥Ã¥È¤¬ÈóÄä»ß (nonblocking) ¤ËÀßÄꤵ¤ì¤Æ¤ª¤ê¡¢
Á°¤ÎÀܳ¤¬´°Î»¤·¤Æ¤¤¤Ê¤¤¡£
.TP
.B EBADF
.\"O The file descriptor is not a valid index in the descriptor table.
¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤¬¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¥Æ¡¼¥Ö¥ë¤Î
Í­¸ú¤Ê¥¤¥ó¥Ç¥Ã¥¯¥¹¤Ç¤Ï¤Ê¤¤¡£
.TP
.B ECONNREFUSED
.\"O No-one listening on the remote address.
¥ê¥â¡¼¥È¥¢¥É¥ì¥¹¤ÇÀܳ¤òÂԤäƤ¤¤ë¥×¥í¥°¥é¥à¤¬¤Ê¤¤¡£
.TP
.B EFAULT
.\"O The socket structure address is outside the user's address space.
¥½¥±¥Ã¥È¹½Â¤ÂΤΥ¢¥É¥ì¥¹¤¬¥æ¡¼¥¶¡¼¤Î¥¢¥É¥ì¥¹¶õ´Ö³°¤Ë¤¢¤ë¡£
.TP
.B EINPROGRESS
.\"O The socket is nonblocking and the connection cannot be completed
.\"O immediately.  It is possible to
.\"O .BR select (2)
.\"O or
.\"O .BR poll (2)
.\"O for completion by selecting the socket for writing.
.\"O After
.\"O .BR select (2)
.\"O indicates writability, use
.\"O .BR getsockopt (2)
.\"O to read the
.\"O .B SO_ERROR
.\"O option at level
.\"O .B SOL_SOCKET
.\"O to determine whether
.\"O .BR connect ()
.\"O completed successfully
.\"O .RB ( SO_ERROR
.\"O is zero) or unsuccessfully
.\"O .RB ( SO_ERROR
.\"O is one of the usual error codes listed here,
.\"O explaining the reason for the failure).
¥½¥±¥Ã¥È¤¬ÈóÄä»ß (nonblocking) ¤ËÀßÄꤵ¤ì¤Æ¤¤¤Æ¡¢Àܳ¤ò¤¹¤°¤Ë
´°Î»¤¹¤ë¤³¤È¤¬¤Ç¤­¤Ê¤¤¡£¤½¤Î¾ì¹ç¡¢
.BR select (2)
¤ä
.BR poll (2)
¤ò»È¤Ã¤Æ¤½¤Î¥½¥±¥Ã¥È¤¬½ñ¤­¹þ¤ß²Äǽ¤Ë¤Ê¤ë¤Î¤òÂԤĤ³¤È¤Ç¡¢
Àܳ¤Î´°Î»¤òÃΤ뤳¤È¤¬¤Ç¤­¤ë¡£
.BR select (2)
¤Ç½ñ¤­¹þ¤ß²Äǽ¤Ë¤Ê¤Ã¤¿¸å¤Ë¡¢
.BR getsockopt (2)
¤ò»È¤Ã¤Æ
.B SOL_SOCKET
¥ì¥Ù¥ë¤Ç
.B SO_ERROR
¥ª¥×¥·¥ç¥ó¤òÆɤ߽Ф¹¤³
¤È¤Ë¤è¤ê¡¢
.BR connect ()
¤¬À®¸ù¤·¤¿¤«¡¢¼ºÇÔ¤·¤¿¤«¤òȽÃǤǤ­¤ë¡£
À®¸ù¤Î¾ì¹ç
.B SO_ERROR
¤¬ 0 ¤Ç¤¢¤ê¡¢
¼ºÇԤξì¹ç
.B SO_ERROR
¤¬¤³¤³¤Î¥ê¥¹¥È¤Ë¤¢¤ë¤¤¤º¤ì¤«¤Î¥¨¥é¡¼¥³¡¼¥É¤Ç¤¢¤ê¡¢
¤½¤ì¤Ë¤è¤ê¼ºÇԤθ¶°ø¤¬Ê¬¤«¤ë¡£
.TP
.B EINTR
.\"O The system call was interrupted by a signal that was caught; see
.\"O .BR signal (7).
.\"O .\" For TCP, the connection will complete asynchronously.
.\"O .\" See http://lkml.org/lkml/2005/7/12/254
Ê᪤µ¤ì¤¿¥·¥°¥Ê¥ë¤Ë¤è¤ê¥·¥¹¥Æ¥à¥³¡¼¥ë¤¬ÃæÃǤµ¤ì¤¿¡£
.BR signal (7)
»²¾È¡£
.\" TCP ¤Î¾ì¹ç¤Ï¡¢Àܳ½èÍý¤ÏÈóƱ´ü¤Ë¤Ê¤ë¤¬´°Î»¤¹¤ë¤À¤í¤¦¡£
.\" http://lkml.org/lkml/2005/7/12/254 ¤ò»²¾È¤Î¤³¤È¡£
.TP
.B EISCONN
.\"O The socket is already connected.
¥½¥±¥Ã¥È¤Ï´û¤ËÀܳ (connect) ¤µ¤ì¤Æ¤¤¤ë¡£
.TP
.B ENETUNREACH
.\"O Network is unreachable.
Åþã¤Ç¤­¤Ê¤¤¥Í¥Ã¥È¥ï¡¼¥¯¤Ç¤¢¤ë¡£
.TP
.B ENOTSOCK
.\"O The file descriptor is not associated with a socket.
¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¡¼¤¬¥½¥±¥Ã¥È¤È´ØÏ¢ÉÕ¤±¤é¤ì¤Æ¤¤¤Ê¤¤¡£
.TP
.B ETIMEDOUT
.\"O Timeout while attempting connection.
.\"O The server may be too
.\"O busy to accept new connections.
.\"O Note that for IP sockets the timeout may
.\"O be very long when syncookies are enabled on the server.
Àܳ¤ò»î¤ß¤Æ¤¤¤ëÅÓÃæ¤Ç»þ´ÖÀÚ¤ì (timeout) ¤Ë¤Ê¤Ã¤¿¡£¥µ¡¼¥Ð¡¼¤¬º®»¨¤·¤Æ¤¤¤Æ
¿·¤¿¤ÊÀܳ¤ò¼õ¤±Æþ¤ì¤é¤ì¤Ê¤¤¤Î¤«¤â¤·¤ì¤Ê¤¤¡£
IP ¥½¥±¥Ã¥È¤Ç¤Ï¡¢ syncookie ¤¬¥µ¡¼¥Ð¡¼¤ÇÍ­¸ú¤Ë¤Ê¤Ã¤Æ¤¤¤ë¾ì¹ç¡¢
¥¿¥¤¥à¥¢¥¦¥È¤¬Èó¾ï¤ËŤ¯¤Ê¤ë¾ì¹ç¤¬¤¢¤ë¤Î¤ÇÃí°Õ¤¹¤ë¤³¤È¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
.\"O SVr4, 4.4BSD, (the
.\"O .BR connect ()
.\"O function first appeared in 4.2BSD), POSIX.1-2001.
.\"O .\" SVr4 documents the additional
.\"O .\" general error codes
.\"O .\" .BR EADDRNOTAVAIL ,
.\"O .\" .BR EINVAL ,
.\"O .\" .BR EAFNOSUPPORT ,
.\"O .\" .BR EALREADY ,
.\"O .\" .BR EINTR ,
.\"O .\" .BR EPROTOTYPE ,
.\"O .\" and
.\"O .\" .BR ENOSR .
SVr4, 4.4BSD,
.RB ( connect ()
´Ø¿ô¤Ï 4.2BSD ¤ÇºÇ½é¤ËÅо줷¤¿), POSIX.1-2001.
.\" SVr4 ¤Ç¤Ï¡¢°ìÈÌŪ¤Ê¥¨¥é¡¼¡¦¥³¡¼¥É¤È¤·¤Æ
.\" .BR EADDRNOTAVAIL ,
.\" .BR EINVAL ,
.\" .BR EAFNOSUPPORT ,
.\" .BR EALREADY ,
.\" .BR EINTR ,
.\" .BR EPROTOTYPE ,
.\" .B ENOSR
.\" ¤¬Äɲ䵤ì¤Æ¤¤¤ë¡£
.\"O .\" It also
.\"O .\" documents many additional error conditions not described here.
.\" ¤Þ¤¿¡¢Ëܥޥ˥奢¥ë¤Ë¤Ïµ­ºÜ¤·¤Æ¤¤¤Ê¤¤ÄɲäΥ¨¥é¡¼¾ò·ï¤¬Â¿¤¯µ­ºÜ¤µ¤ì¤Æ¤¤¤ë¡£
.\"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
¥¤¥ó¥¯¥ë¡¼¥É¤¹¤ë¤Î¤¬¸­ÌÀ¤Ç¤¢¤í¤¦¡£

.\"O The third argument of
.\"O .BR connect ()
.\"O is in reality an
.\"O .I int
.\"O (and this is what 4.x BSD and libc4 and libc5 have).
.\"O Some POSIX confusion resulted in the present
.\"O .IR socklen_t ,
.\"O also used by glibc.
.\"O See also
.\"O .BR accept (2).
.BR connect ()
¤Î»°ÈÖÌܤΰú¤­¿ô¤Ï 4.x BSD ¤ä libc4, libc5 ¤ÈƱÍͤ˼ºݤˤÏ
.I int
¤Ç¤¢¤ë¡£
POSIX ¤Ç¤Ïäþ;¶ÊÀÞ¤ò·Ð¤Æ¸½ºß¤Î
.I socklen_t
¤Ë¤Ê¤Ã¤Æ¤ª¤ê¡¢
glibc ¤Ç¤â
.I socklen_t
¤ò»È¤Ã¤Æ¤¤¤ë¡£
.BR accept (2)
¤â»²¾È¤Î¤³¤È¡£
.\"O .SH EXAMPLE
.SH Îã
.\"O An example of the use of
.\"O .BR connect ()
.\"O is shown in
.\"O .BR getaddrinfo (3).
.BR connect ()
¤ÎÍøÍÑÎ㤬
.BR getaddrinfo (3)
¤Ëµ­ºÜ¤µ¤ì¤Æ¤¤¤ë¡£
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR accept (2),
.BR bind (2),
.BR getsockname (2),
.BR listen (2),
.BR socket (2),
.BR path_resolution (7)