CONNECT(2)                           BSD                            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 name, which is an address in
     the communications space of the socket.  Each communications space
     interprets the name parameter in its own way.  Generally, stream sockets
     can successfully connect only once; datagram sockets can use connect
     multiple times to change their association.  Datagram sockets may
     dissolve the association by connecting to an invalid address such as a
     null address.

ERRORS
     The connect call fails if any of the following are true:

     [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 family cannot be
                       used with this socket.

     [EISCONN]         The socket is already connected.

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

     [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 name parameter specifies an area outside the
                       process address space.

     [EINPROGRESS]     The socket is non-blocking and the connection cannot be
                       completed immediately.  It is possible to select(2) for
                       completion by selecting the socket for writing.

     [EALREADY]        The socket is non-blocking and a previous 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.

     [ENAMETOOLONG]    A component of a pathname exceeded 255 characters, or
                       an entire pathname 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)

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

NOTES
     Some implementations also define the following error:

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