4.3BSD-UWisc/man/cat2/connect.2

CONNECT(2)          UNIX Programmer's Manual           CONNECT(2)



NAME
     connect - initiate a connection on a socket

SYNOPSIS
     #include <sys/types.h>
     #include <sys/socket.h>

     connect(s, name, namelen)
     int s;
     struct sockaddr *name;
     int namelen;

DESCRIPTION
     The parameter _s is a socket.  If it is of type SOCK_DGRAM,
     then 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 SOCK_STREAM,
     then this call attempts to make a connection to another
     socket.  The other socket is specified by _n_a_m_e, which is an
     address in the communications space of the socket.  Each
     communications space interprets the _n_a_m_e parameter in its
     own way.  Generally, stream sockets may successfully _c_o_n_n_e_c_t
     only once; datagram sockets may use _c_o_n_n_e_c_t multiple times
     to change their association.  Datagram sockets may dissolve
     the association by connecting to an invalid address, such as
     a null address.

RETURN VALUE
     If the connection or binding succeeds, then 0 is returned.
     Otherwise a -1 is returned, and a more specific error code
     is stored in _e_r_r_n_o.

ERRORS
     The call fails if:

     [EBADF]             _S is not a valid descriptor.

     [ENOTSOCK]          _S is a descriptor for a file, not a
                         socket.

     [EADDRNOTAVAIL]     The specified address is not available
                         on this machine.

     [EAFNOSUPPORT]      Addresses in the specified address fam-
                         ily cannot be used with this socket.

     [EISCONN]           The socket is already connected.

     [ETIMEDOUT]         Connection establishment timed out
                         without establishing a connection.




Printed 12/27/86          May 22, 1986                          1






CONNECT(2)          UNIX Programmer's Manual           CONNECT(2)



     [ECONNREFUSED]      The attempt to connect was forcefully
                         rejected.

     [ENETUNREACH]       The network isn't reachable from this
                         host.

     [EADDRINUSE]        The address is already in use.

     [EFAULT]            The _n_a_m_e parameter specifies an area
                         outside the process address space.

     [EINPROGRESS]       The socket is non-blocking and the con-
                         nection cannot be completed immediately.
                         It is possible to _s_e_l_e_c_t(2) for comple-
                         tion by selecting the socket for writ-
                         ing.

     [EALREADY]          The socket is non-blocking and a previ-
                         ous connection attempt has not yet been
                         completed.

     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.

     [ENOTDIR]      A component of the path prefix is not a
                    directory.

     [EINVAL]       The pathname contains a character with the
                    high-order bit set.

     [ENAMETOOLONG] A component of a pathname exceeded 255 char-
                    acters, or an entire path name exceeded 1023
                    characters.

     [ENOENT]       The named socket does not exist.

     [EACCES]       Search permission is denied for a component
                    of the path prefix.

     [EACCES]       Write access to the named socket is denied.

     [ELOOP]        Too many symbolic links were encountered in
                    translating the pathname.

SEE ALSO
     accept(2), select(2), socket(2), getsockname(2)








Printed 12/27/86          May 22, 1986                          2