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-.\"
.\" 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.
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+.\" %%%LICENSE_END
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.\" 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.
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.\" 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>
.\"
-.TH CONNECT 2 2008-12-03 "Linux" "Linux Programmer's Manual"
+.TH CONNECT 2 2014-09-06 "Linux" "Linux Programmer's Manual"
.SH NAME
connect \- initiate a connection on a socket
.SH SYNOPSIS
If the socket
.I sockfd
is of type
-.B SOCK_DGRAM
+.BR SOCK_DGRAM ,
then
.I addr
is the address to which datagrams are sent by default, and the only
set to
.BR AF_UNSPEC
(supported on Linux since kernel 2.2).
-.SH "RETURN VALUE"
+.SH RETURN VALUE
If the connection or binding succeeds, zero is returned.
On error, \-1 is returned, and
.I errno
There may be other domain-specific error codes.
.TP
.B EACCES
-For Unix domain sockets, which are identified by pathname:
+For UNIX domain sockets, which are identified by pathname:
Write permission is denied on the socket file,
or search permission is denied for one of the directories
in the path prefix.
.B EADDRINUSE
Local address is already in use.
.TP
+.B EADDRNOTAVAIL
+(Internet domain sockets)
+The socket referred to by
+.I sockfd
+had not previously been bound to an address and,
+upon attempting to bind it to an ephemeral port,
+it was determined that all port numbers in the ephemeral port range
+are currently in use.
+See the discussion of
+.I /proc/sys/net/ipv4/ip_local_port_range
+in
+.BR ip (7).
+.TP
.B EAFNOSUPPORT
The passed address didn't have the correct address family in its
.I sa_family
field.
.TP
.B EAGAIN
-No more free local ports or insufficient entries in the routing cache.
-For
-.B AF_INET
-see the description of
-.I /proc/sys/net/ipv4/ip_local_port_range
-.BR ip (7)
-for information on how to increase the number of local ports.
+Insufficient entries in the routing cache.
.TP
.B EALREADY
The socket is nonblocking and a previous connection attempt has not yet
.B ENOTSOCK
The file descriptor is not associated with a socket.
.TP
+.B EPROTOTYPE
+The socket type does not support the requested communications protocol.
+This error can occur, for example,
+on an attempt to connect a UNIX domain datagram socket to a stream socket.
+.TP
.B ETIMEDOUT
Timeout while attempting connection.
The server may be too
busy to accept new connections.
Note that for IP sockets the timeout may
be very long when syncookies are enabled on the server.
-.SH "CONFORMING TO"
+.SH CONFORMING TO
SVr4, 4.4BSD, (the
.BR connect ()
function first appeared in 4.2BSD), POSIX.1-2001.
also used by glibc.
See also
.BR accept (2).
+
+If
+.BR connect ()
+fails, consider the state of the socket as unspecified.
+Portable applications should close the socket and create a new one for
+reconnecting.
.SH EXAMPLE
An example of the use of
.BR connect ()
is shown in
.BR getaddrinfo (3).
-.SH "SEE ALSO"
+.SH SEE ALSO
.BR accept (2),
.BR bind (2),
.BR getsockname (2),
.BR listen (2),
.BR socket (2),
.BR path_resolution (7)
+.SH COLOPHON
+This page is part of release 3.79 of the Linux
+.I man-pages
+project.
+A description of the project,
+information about reporting bugs,
+and the latest version of this page,
+can be found at
+\%http://www.kernel.org/doc/man\-pages/.