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32 .\" @(#)connect.2 8.1 (Berkeley) 6/4/93
40 .Nd initiate a connection on a socket
47 .Fn connect "int s" "const struct sockaddr *name" "socklen_t namelen"
55 this call specifies the peer with which the socket is to be associated;
56 this address is that to which datagrams are to be sent,
57 and the only address from which datagrams are to be received.
58 If the socket is of type
60 this call attempts to make a connection to
62 The other socket is specified by
64 which is an address in the communications space of the socket.
65 Each communications space interprets the
67 argument in its own way.
68 Generally, stream sockets may successfully
70 only once; datagram sockets may use
72 multiple times to change their association.
73 Datagram sockets may dissolve the association
74 by connecting to an invalid address, such as a null address.
86 is not a valid descriptor.
91 is a descriptor for a file, not a socket.
92 .It Bq Er EADDRNOTAVAIL
93 The specified address is not available on this machine.
94 .It Bq Er EAFNOSUPPORT
95 Addresses in the specified address family cannot be used with this socket.
97 The socket is already connected.
99 Connection establishment timed out without establishing a connection.
100 .It Bq Er ECONNREFUSED
101 The attempt to connect was forcefully rejected.
102 .It Bq Er ENETUNREACH
103 The network is not reachable from this host.
104 .It Bq Er EHOSTUNREACH
105 The remote host is not reachable from this host.
107 The address is already in use.
111 argument specifies an area outside
112 the process address space.
113 .It Bq Er EINPROGRESS
114 The socket is non-blocking
115 and the connection cannot
116 be completed immediately.
119 for completion by selecting the socket for writing.
121 The connection attempt was interrupted by the delivery of a signal.
122 The connection will be established in the background,
126 A previous connection attempt has not yet been completed.
128 An attempt is made to connect to a broadcast address (obtained through the
132 return value) through a socket that does not provide broadcast functionality.
135 The following errors are specific to connecting names in the UNIX domain.
136 These errors may not apply in future versions of the UNIX IPC domain.
139 A component of the path prefix is not a directory.
140 .It Bq Er ENAMETOOLONG
141 A component of a pathname exceeded 255 characters,
142 or an entire path name exceeded 1023 characters.
144 The named socket does not exist.
146 Search permission is denied for a component of the path prefix.
148 Write access to the named socket is denied.
150 Too many symbolic links were encountered in translating the pathname.
161 system call appeared in