CONNECT(2)CONNECT(2)NAMEconnect - 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 ALSOaccept(2), select(2), socket(2), getsockname(2)4.2 Berkeley Distribution May 22, 1986 CONNECT(2)
