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BSD 2.11 - man page for connect (bsd section 2)

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CONNECT(2)									       CONNECT(2)

       connect - initiate a connection on a socket

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

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

       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 may successfully connect only once; datagram sockets may
       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.

       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.

       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 family cannot  be  used  with  this

       [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

       [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.

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

       [ENAMETOOLONG] A component of a pathname exceeded 255 characters, 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.

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

4.2 Berkeley Distribution		   May 22, 1986 			       CONNECT(2)
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