freebsd-dev/lib/libc/sys/connect.2
Ceri Davies d5882f3f58 [1] - Document EHOSTUNREACH as a possible error
[2]	- Remove a contraction

PR:		docs/50401
Submitted by:	[1] Slaven Rezic <slaven@rezic.de>
MFC after:	1 week
2003-04-01 20:25:46 +00:00

154 lines
4.9 KiB
Groff

.\" Copyright (c) 1983, 1993
.\" The Regents of the University of California. All rights reserved.
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.\" @(#)connect.2 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd June 4, 1993
.Dt CONNECT 2
.Os
.Sh NAME
.Nm connect
.Nd initiate a connection on a socket
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/types.h
.In sys/socket.h
.Ft int
.Fn connect "int s" "const struct sockaddr *name" "socklen_t namelen"
.Sh DESCRIPTION
The
.Fa s
argument
is a socket.
If it is of type
.Dv SOCK_DGRAM ,
this call specifies the peer with which the socket is to be associated;
this address is that to which datagrams are to be sent,
and the only address from which datagrams are to be received.
If the socket is of type
.Dv SOCK_STREAM ,
this call attempts to make a connection to
another socket.
The other socket is specified by
.Fa name ,
which is an address in the communications space of the socket.
Each communications space interprets the
.Fa name
argument in its own way.
Generally, stream sockets may successfully
.Fn connect
only once; datagram sockets may use
.Fn connect
multiple times to change their association.
Datagram sockets may dissolve the association
by connecting to an invalid address, such as a null address.
.Sh RETURN VALUES
.Rv -std connect
.Sh ERRORS
The
.Fn connect
system call fails if:
.Bl -tag -width Er
.It Bq Er EBADF
The
.Fa s
argument
is not a valid descriptor.
.It Bq Er ENOTSOCK
The
.Fa s
argument
is a descriptor for a file, not a socket.
.It Bq Er EADDRNOTAVAIL
The specified address is not available on this machine.
.It Bq Er EAFNOSUPPORT
Addresses in the specified address family cannot be used with this socket.
.It Bq Er EISCONN
The socket is already connected.
.It Bq Er ETIMEDOUT
Connection establishment timed out without establishing a connection.
.It Bq Er ECONNREFUSED
The attempt to connect was forcefully rejected.
.It Bq Er ENETUNREACH
The network is not reachable from this host.
.It Bq Er EHOSTUNREACH
The remote host is not reachable from this host.
.It Bq Er EADDRINUSE
The address is already in use.
.It Bq Er EFAULT
The
.Fa name
argument specifies an area outside
the process address space.
.It Bq Er EINPROGRESS
The socket is non-blocking
and the connection cannot
be completed immediately.
It is possible to
.Xr select 2
for completion by selecting the socket for writing.
.It Bq Er EALREADY
The socket is non-blocking
and a previous connection attempt
has not yet been completed.
.El
.Pp
The following errors are specific to connecting names in the UNIX domain.
These errors may not apply in future versions of the UNIX IPC domain.
.Bl -tag -width Er
.It Bq Er ENOTDIR
A component of the path prefix is not a directory.
.It Bq Er ENAMETOOLONG
A component of a pathname exceeded 255 characters,
or an entire path name exceeded 1023 characters.
.It Bq Er ENOENT
The named socket does not exist.
.It Bq Er EACCES
Search permission is denied for a component of the path prefix.
.It Bq Er EACCES
Write access to the named socket is denied.
.It Bq Er ELOOP
Too many symbolic links were encountered in translating the pathname.
.El
.Sh SEE ALSO
.Xr accept 2 ,
.Xr getpeername 2 ,
.Xr getsockname 2 ,
.Xr select 2 ,
.Xr socket 2
.Sh HISTORY
The
.Fn connect
system call appeared in
.Bx 4.2 .