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>Chapter 38. TCP/IP Library Reference</TD
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>CONNECT(2)                    System Calls Manual                   CONNECT(2)
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NAME
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     connect - initiate a connection on a socket
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SYNOPSIS
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     #include &lt;sys/types.h&#62;
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     #include &lt;sys/socket.h&#62;
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     int
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     connect(int s, const struct sockaddr *name, socklen_t namelen);
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DESCRIPTION
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     The parameter s is a socket.  If it is of type SOCK_DGRAM, this call
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     specifies the peer with which the socket is to be associated; this
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     address is that to which datagrams are to be sent, and the only address
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     from which datagrams are to be received.  If the socket is of type
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     SOCK_STREAM, this call attempts to make a connection to another socket.
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     The other socket is specified by name, which is an address in the commu-
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     nications space of the socket.  Each communications space interprets the
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     name parameter in its own way.  Generally, stream sockets may success-
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     fully connect() only once; datagram sockets may use connect() multiple
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     times to change their association.  Datagram sockets may dissolve the
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     association by connecting to an invalid address, such as a null address.
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RETURN VALUES
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     If the connection or binding succeeds, 0 is returned.  Otherwise a -1 is
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     returned, and a more specific error code is stored in errno.
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ERRORS
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     The connect() call fails if:
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     [EBADF]            S is not a valid descriptor.
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     [ENOTSOCK]         S is a descriptor for a file, not a socket.
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     [EADDRNOTAVAIL]    The specified address is not available on this
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                        machine.
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     [EAFNOSUPPORT]     Addresses in the specified address family cannot be
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                        used with this socket.
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     [EISCONN]          The socket is already connected.
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     [ETIMEDOUT]        Connection establishment timed out without establish-
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                        ing a connection.
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     [EINVAL]           A TCP connection with a local broadcast, the all-ones
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                        or a multicast address as the peer was attempted.
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     [ECONNREFUSED]     The attempt to connect was forcefully rejected.
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     [EINTR]            A connect was interrupted before it succeeded by the
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                        delivery of a signal.
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     [ENETUNREACH]      The network isn't reachable from this host.
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     [EADDRINUSE]       The address is already in use.
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     [EFAULT]           The name parameter specifies an area outside the pro-
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                        cess address space.
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     [EINPROGRESS]      The socket is non-blocking and the connection cannot
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                        be completed immediately.  It is possible to select(2)
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                        or poll(2) for completion by selecting the socket for
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                        writing, and also use getsockopt(2) with SO_ERROR to
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                        check for error conditions.
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     [EALREADY]         The socket is non-blocking and a previous connection
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                        attempt has not yet been completed.
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     The following errors are specific to connecting names in the UNIX domain.
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     These errors may not apply in future versions of the UNIX IPC domain.
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     [ENOTDIR]          A component of the path prefix is not a directory.
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     [ENAMETOOLONG]     A component of a pathname exceeded {NAME_MAX} charac-
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                        ters, or an entire path name exceeded {PATH_MAX} char-
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                        acters.
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     [ENOENT]           The named socket does not exist.
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     [EACCES]           Search permission is denied for a component of the
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                        path prefix.
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     [EACCES]           Write access to the named socket is denied.
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     [ELOOP]            Too many symbolic links were encountered in translat-
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                        ing the pathname.
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SEE ALSO
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     accept(2), getsockname(2), getsockopt(2), poll(2), select(2), socket(2)
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HISTORY
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     The connect() function call appeared in 4.2BSD.
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BSD                            February 15, 1999                           BSD
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