Connect 1 1

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Theconnect function establishes a connection to a specified socket.

Syntax

Parameters

s

A descriptor identifying an unconnected socket.

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name

A pointer to thesockaddr structure to which the connection should be established. Switchresx 4 9 12.

namelen

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The length, in bytes, of the sockaddr structure pointed to by the name parameter.

Return value

If no error occurs,connect returns zero. Otherwise, it returns SOCKET_ERROR, and a specific error code can be retrieved by callingWSAGetLastError.

On a blocking socket, the return value indicates success or failure of the connection attempt.

With a nonblocking socket, the connection attempt cannot be completed immediately. In this case,connect will return SOCKET_ERROR, andWSAGetLastError will returnWSAEWOULDBLOCK. In this case, there are three possible scenarios:

• Use the select function to determine the completion of the connection request by checking to see if the socket is writeable.
• If the application is using WSAAsyncSelect to indicate interest in connection events, then the application will receive an FD_CONNECT notification indicating that the connect operation is complete (successfully or not).
• If the application is using WSAEventSelect to indicate interest in connection events, then the associated event object will be signaled indicating that the connect operation is complete (successfully or not).

Until the connection attempt completes on a nonblocking socket, all subsequent calls toconnect on the same socket will fail with the error codeWSAEALREADY, andWSAEISCONN when the connection completes successfully. Due to ambiguities in version 1.1 of the Windows Sockets specification, error codes returned fromconnect while a connection is already pending may vary among implementations. As a result, it is not recommended that applications use multiple calls to connect to detect connection completion. If they do, they must be prepared to handleWSAEINVAL andWSAEWOULDBLOCK error values the same way that they handleWSAEALREADY, to assure robust operation.

Bookmacster 2 9 15 niv. If the error code returned indicates the connection attempt failed (that is,WSAECONNREFUSED,WSAENETUNREACH,WSAETIMEDOUT) the application can callconnect again for the same socket.

Remarks

Theconnect function is used to create a connection to the specified destination. If socket s, is unbound, unique values are assigned to the local association by the system, and the socket is marked as bound.

For connection-oriented sockets (for example, type SOCK_STREAM), an active connection is initiated to the foreign host using name (an address in the namespace of the socket; for a detailed description, seebind andsockaddr).

When the socket call completes successfully, the socket is ready to send and receive data. If the address member of the structure specified by the name parameter is filled with zeros,connect will return the errorWSAEADDRNOTAVAIL. Any attempt to reconnect an active connection will fail with the error codeWSAEISCONN. Sql injection tool get cc cvv generator.

Tableau mac. For connection-oriented, nonblocking sockets, it is often not possible to complete the connection immediately. In such a case, this function returns the errorWSAEWOULDBLOCK. However, the operation proceeds.

When the success or failure outcome becomes known, it may be reported in one of two ways, depending on how the client registers for notification. Jump desktop 8 2 1991.

• If the client uses the select function, success is reported in the writefds set and failure is reported in the exceptfds set.
• If the client uses the functions WSAAsyncSelect or WSAEventSelect, the notification is announced with FD_CONNECT and the error code associated with the FD_CONNECT indicates either success or a specific reason for failure.

If the connection is not completed immediately, the client should wait for connection completion before attempting to set socket options using setsockopt. Calling setsockopt while a connection is in progress is not supported.

For a connectionless socket (for example, type SOCK_DGRAM), the operation performed byconnect is merely to establish a default destination address that can be used on subsequentsend/WSASend andrecv/WSARecv calls. Any datagrams received from an address other than the destination address specified will be discarded. If the address member of the structure specified by name is filled with zeros, the socket will be disconnected. Then, the default remote address will be indeterminate, sosend/WSASend andrecv/WSARecv calls will return the error codeWSAENOTCONN. However,sendto/WSASendTo andrecvfrom/WSARecvFrom can still be used. The default destination can be changed by simply callingconnect again, even if the socket is already connected. Any datagrams queued for receipt are discarded if name is different from the previousconnect.

Quark download. For connectionless sockets, name can indicate any valid address, including a broadcast address. However, to connect to a broadcast address, a socket must usesetsockopt to enable the SO_BROADCAST option. Otherwise,connect will fail with the error codeWSAEACCES.

When a connection between sockets is broken, the socket that was connected should be discarded and new socket should be created. When a problem develops on a connected socket, the application must discard the socket and create the socket again in order to return to a stable point.

Example Code

For another example that uses the connect function, see Getting Started With Winsock.

Notes for IrDA Sockets

• The Af_irda.h header file must be explicitly included.
• If an existing IrDA connection is detected at the media-access level, WSAENETDOWN is returned.
• If active connections to a device with a different address exist, WSAEADDRINUSE is returned.
• If the socket is already connected or an exclusive/multiplexed mode change failed, WSAEISCONN is returned.
• If the socket was previously bound to a local service name to accept incoming connections using bind, WSAEINVAL is returned. Note that once a socket is bound, it cannot be used for establishing an outbound connection.

IrDA implements the connect function with addresses of the form sockaddr_irda. Typically, a client application will create a socket with the socket function, scan the immediate vicinity for IrDA devices with the IRLMP_ENUMDEVICES socket option, choose a device from the returned list, form an address, and then callconnect. There is no difference between blocking and nonblocking semantics. Playonmac 4 1.

Requirements

Connect 1-1 Coupon

See also