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 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.

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 errno.

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 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.

[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.

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