2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
178 lines
5.4 KiB
Groff
178 lines
5.4 KiB
Groff
.\" $NetBSD: connect.2,v 1.28 2010/05/31 12:16:20 njoly Exp $
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.\"
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.\" Copyright (c) 1983, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)connect.2 8.1 (Berkeley) 6/4/93
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.\"
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.Dd May 18, 2004
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.Dt CONNECT 2
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.Os
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.Sh NAME
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.Nm connect
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.Nd initiate a connection on a socket
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/socket.h
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.Ft int
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.Fn connect "int s" "const struct sockaddr *name" "socklen_t namelen"
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.Sh DESCRIPTION
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The parameter
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.Fa s
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is a socket.
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If it is of type
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.Dv SOCK_DGRAM ,
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this call specifies the peer with which the socket is to be associated;
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this address is that to which datagrams are to be sent,
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and the only address from which datagrams are to be received.
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If the socket is of type
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.Dv SOCK_STREAM ,
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this call attempts to make a connection to
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another socket.
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The other socket is specified by
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.Fa name ,
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which is an address in the communications space of the socket.
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.Fa namelen
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indicates the amount of space pointed to by
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.Fa name ,
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in bytes.
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Each communications space interprets the
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.Fa name
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parameter in its own way.
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Generally, stream sockets may successfully
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.Fn connect
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only once; datagram sockets may use
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.Fn connect
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multiple times to change their association.
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Datagram sockets may dissolve the association
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by connecting to an invalid address, such as a null address.
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.Pp
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If a
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.Fn connect
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call is interrupted by a signal, it will return with errno set to
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.Er EINTR
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and the connection attempt will proceed as if the socket was non-blocking.
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Subsequent calls to
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.Fn connect
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will set errno to
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.Er EALREADY .
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.Sh RETURN VALUES
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If the connection or binding succeeds, 0 is returned.
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Otherwise a \-1 is returned, and a more specific error
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code is stored in
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.Va errno .
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.Sh ERRORS
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The
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.Fn connect
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call fails if:
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.Bl -tag -width Er
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.It Bq Er EBADF
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.Fa s
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is not a valid descriptor.
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.It Bq Er ENOTSOCK
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.Fa s
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is a descriptor for a file, not a socket.
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.It Bq Er EADDRNOTAVAIL
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The specified address is not available on this machine.
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.It Bq Er EAFNOSUPPORT
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Addresses in the specified address family cannot be used with this socket.
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.It Bq Er EISCONN
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The socket is already connected.
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.It Bq Er ETIMEDOUT
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Connection establishment timed out without establishing a connection.
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.It Bq Er ECONNREFUSED
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The attempt to connect was forcefully rejected.
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.It Bq Er ENETUNREACH
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The network isn't reachable from this host.
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.It Bq Er EADDRINUSE
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The address is already in use.
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.It Bq Er EFAULT
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The
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.Fa name
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parameter specifies an area outside
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the process address space.
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.It Bq Er EINPROGRESS
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The socket is non-blocking and the connection cannot be completed immediately.
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It is possible to
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.Xr select 2
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or
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.Xr poll 2
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for completion by selecting or polling the socket for writing.
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The success or failure of the connect operation may be determined by using
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.Xr getsockopt 2
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to read the socket error status with the
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.Dv SO_ERROR
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option at the
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.Dv SOL_SOCKET
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level.
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The returned socket error status is zero on success, or one of the
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error codes listed here on failure.
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.It Bq Er EALREADY
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Either the socket is non-blocking mode or a previous call to
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.Fn connect
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was interrupted by a signal, and the connection attempt has not yet
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been completed.
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.It Bq Er EINTR
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The connection attempt was interrupted by a signal.
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.El
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.Pp
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The following errors are specific to connecting names in the
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.Ux
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domain.
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These errors may not apply in future versions of the
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.Ux
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IPC domain.
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.Bl -tag -width Er
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.It Bq Er ENOTDIR
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A component of the path prefix is not a directory.
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.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded
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.Brq Dv NAME_MAX
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characters, or an entire path name exceeded
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.Brq Dv PATH_MAX
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characters.
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.It Bq Er ENOENT
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The named socket does not exist.
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.It Bq Er EACCES
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Search permission is denied for a component of the path prefix, or
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write access to the named socket is denied.
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.It Bq Er ELOOP
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Too many symbolic links were encountered in translating the pathname.
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.El
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.Sh SEE ALSO
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.Xr accept 2 ,
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.Xr getsockname 2 ,
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.Xr getsockopt 2 ,
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.Xr poll 2 ,
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.Xr select 2 ,
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.Xr socket 2
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.Sh HISTORY
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The
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.Fn connect
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function call appeared in
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.Bx 4.2 .
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