opendarwin man page for connect

CONNECT(2)						      BSD System Calls Manual							CONNECT(2)

NAME
     connect -- initiate a connection on a socket

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

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

DESCRIPTION
     The parameter s is a socket.  If it is of type SOCK_DGRAM, 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, 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 dis-
     solve the association by connecting to an invalid address, such as a null address or an address with the address family set to AF_UNPSEC (the
     error EAFNOSUPPORT will be harmlessly returned).

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

ERRORS
     The connect() 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 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 {NAME_MAX} characters, or an entire path name exceeded {PATH_MAX} 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)

HISTORY
     The connect() function call appeared in 4.2BSD.

4.2 Berkeley Distribution					   June 4, 1993 					 4.2 Berkeley Distribution