/* -------------------------------------------------------------------------
* Project: GSocket (Generic Socket)
* Name: gsocket.h
+ * Author: Guilhem Lavaux
+ * Guillermo Rodriguez Garcia <guille@iies.es> (maintainer)
* Purpose: GSocket include file (system independent)
* CVSID: $Id$
* -------------------------------------------------------------------------
*/
+
#ifndef __GSOCKET_H
#define __GSOCKET_H
GSOCK_MEMERR
} GSocketError;
+/* See below for an explanation on how events work.
+ */
typedef enum {
GSOCK_INPUT = 0,
GSOCK_OUTPUT = 1,
/* GSocket_Init() must be called at the beginning */
bool GSocket_Init();
-/* GSocket_Cleanup() must be called at the ending */
+
+/* GSocket_Cleanup() must be called at the end */
void GSocket_Cleanup();
+
/* Constructors / Destructors */
GSocket *GSocket_new();
void GSocket_destroy(GSocket *socket);
-/* This will disable all further IO calls to this socket */
+
+
+/* GSocket_Shutdown:
+ * Disallow further read/write operations on this socket, close
+ * the fd and disable all callbacks.
+ */
void GSocket_Shutdown(GSocket *socket);
/* Address handling */
+/* GSocket_SetLocal:
+ * GSocket_GetLocal:
+ * GSocket_SetPeer:
+ * GSocket_GetPeer:
+ * Set or get the local or peer address for this socket. The 'set'
+ * functions return GSOCK_NOERROR on success, an error code otherwise.
+ * The 'get' functions return a pointer to a GAddress object on success,
+ * or NULL otherwise, in which case they set the error code of the
+ * corresponding GSocket.
+ *
+ * Error codes:
+ * GSOCK_INVSOCK - the socket is not valid.
+ * GSOCK_INVADDR - the address is not valid.
+ */
GSocketError GSocket_SetLocal(GSocket *socket, GAddress *address);
GSocketError GSocket_SetPeer(GSocket *socket, GAddress *address);
GAddress *GSocket_GetLocal(GSocket *socket);
GAddress *GSocket_GetPeer(GSocket *socket);
-/* Non-oriented connections handlers */
-
-GSocketError GSocket_SetNonOriented(GSocket *socket);
-
/* Server specific parts */
/* GSocket_SetServer:
- * Sets up the socket as a server. It uses the "Local" field of GSocket.
- * "Local" must be set by GSocket_SetLocal() before GSocket_SetServer()
- * is called. Possible error codes are: GSOCK_INVSOCK if socket has not
- * been initialized, GSOCK_INVADDR if the local address has not been
- * defined and GSOCK_IOERR for other internal errors.
+ * Sets up this socket as a server. The local address must have been
+ * set with GSocket_SetLocal() before GSocket_SetServer() is called.
+ * Returns GSOCK_NOERROR on success, one of the following otherwise:
+ *
+ * Error codes:
+ * GSOCK_INVSOCK - the socket is in use.
+ * GSOCK_INVADDR - the local address has not been set.
+ * GSOCK_IOERR - low-level error.
*/
GSocketError GSocket_SetServer(GSocket *socket);
/* GSocket_WaitConnection:
- * Waits for an incoming client connection.
+ * Waits for an incoming client connection. Returns a pointer to
+ * a GSocket object, or NULL if there was an error, in which case
+ * the last error field will be updated for the calling GSocket.
+ *
+ * Error codes (set in the calling GSocket)
+ * GSOCK_INVSOCK - the socket is not valid or not a server.
+ * GSOCK_TIMEDOUT - timeout, no incoming connections.
+ * GSOCK_WOULDBLOCK - the call would block and the socket is nonblocking.
+ * GSOCK_MEMERR - couldn't allocate memory.
+ * GSOCK_IOERR - low-level error.
*/
GSocket *GSocket_WaitConnection(GSocket *socket);
+
/* Client specific parts */
/* GSocket_Connect:
- * Establishes a client connection to a server using the "Peer"
- * field of GSocket. "Peer" must be set by GSocket_SetPeer() before
- * GSocket_Connect() is called. Possible error codes are GSOCK_INVSOCK,
- * GSOCK_INVADDR, GSOCK_TIMEDOUT, GSOCK_WOULDBLOCK and GSOCK_IOERR.
- * If a socket is nonblocking and Connect() returns GSOCK_WOULDBLOCK,
- * the connection request can be completed later. Use GSocket_Select()
- * to check it, or wait for a GSOCK_CONNECTION event.
+ * For stream (connection oriented) sockets, GSocket_Connect() tries
+ * to establish a client connection to a server using the peer address
+ * as established with GSocket_SetPeer(). Returns GSOCK_NOERROR if the
+ * connection has been succesfully established, or one of the error
+ * codes listed below. Note that for nonblocking sockets, a return
+ * value of GSOCK_WOULDBLOCK doesn't mean a failure. The connection
+ * request can be completed later; you should use GSocket_Select()
+ * to poll for GSOCK_CONNECTION | GSOCK_LOST, or wait for the
+ * corresponding asynchronous events.
+ *
+ * For datagram (non connection oriented) sockets, GSocket_Connect()
+ * just sets the peer address established with GSocket_SetPeer() as
+ * default destination.
+ *
+ * Error codes:
+ * GSOCK_INVSOCK - the socket is in use or not valid.
+ * GSOCK_INVADDR - the peer address has not been established.
+ * GSOCK_TIMEDOUT - timeout, the connection failed.
+ * GSOCK_WOULDBLOCK - connection in progress (nonblocking sockets only)
+ * GSOCK_MEMERR - couldn't allocate memory.
+ * GSOCK_IOERR - low-level error.
*/
GSocketError GSocket_Connect(GSocket *socket, GSocketStream stream);
+
+/* Datagram sockets */
+
+/* GSocket_SetNonOriented:
+ * Sets up this socket as a non-connection oriented (datagram) socket.
+ * Before using this function, the local address must have been set
+ * with GSocket_SetLocal(), or the call will fail. Returns GSOCK_NOERROR
+ * on success, or one of the following otherwise.
+ *
+ * Error codes:
+ * GSOCK_INVSOCK - the socket is in use.
+ * GSOCK_INVADDR - the local address has not been set.
+ * GSOCK_IOERR - low-level error.
+ */
+GSocketError GSocket_SetNonOriented(GSocket *socket);
+
+
/* Generic IO */
/* Like recv(), send(), ... */
-/* NOTE: In case we read from a non-oriented connection, the incoming
- * (outgoing) connection address is stored in the "Local" ("Peer")
- * field.
+/* For datagram sockets, the incoming / outgoing addresses
+ * are stored as / read from the 'peer' address field.
*/
int GSocket_Read(GSocket *socket, char *buffer, int size);
int GSocket_Write(GSocket *socket, const char *buffer,
* check for the events specified in the 'flags' parameter, and
* it will return a mask indicating which operations can be
* performed. This function won't block, regardless of the
- * mode (blocking|nonblocking) of the socket.
+ * mode (blocking | nonblocking) of the socket.
*/
GSocketEventFlags GSocket_Select(GSocket *socket, GSocketEventFlags flags);
-/* Flags/Parameters */
-/* GSocket_SetTimeout:
- * Sets the timeout for blocking calls. Time is
- * expressed in milliseconds.
- */
-void GSocket_SetTimeout(GSocket *socket, unsigned long millisec);
+/* Attributes */
/* GSocket_SetNonBlocking:
- * Sets the socket to non-blocking mode. This is useful if
- * we don't want to wait.
+ * Sets the socket to non-blocking mode. All IO calls will return
+ * immediately.
*/
void GSocket_SetNonBlocking(GSocket *socket, bool non_block);
+/* GSocket_SetTimeout:
+ * Sets the timeout for blocking calls. Time is expressed in
+ * milliseconds.
+ */
+void GSocket_SetTimeout(GSocket *socket, unsigned long millisec);
+
/* GSocket_GetError:
- * Returns the last error occured for this socket.
+ * Returns the last error occured for this socket. Note that successful
+ * operations do not clear this back to GSOCK_NOERROR, so use it only
+ * after an error.
*/
GSocketError GSocket_GetError(GSocket *socket);
+
/* Callbacks */
-/* Only one callback is possible for each event (INPUT, OUTPUT, CONNECTION
- * and LOST). The callbacks are called in the following situations:
- *
- * INPUT: There is at least one byte in the input buffer
- * OUTPUT: The system is sure that the next write call will not block
- * CONNECTION: Two cases are possible:
- * Client socket -> the connection is established
- * Server socket -> a client requests a connection
- * LOST: The connection is lost
- *
- * An event is generated only once and its state is reseted when the
- * relative IO call is requested.
- * For example: INPUT -> GSocket_Read()
- * CONNECTION -> GSocket_Accept()
+/* GSOCK_INPUT:
+ * There is data to be read in the input buffer. If, after a read
+ * operation, there is still data available, the callback function will
+ * be called again.
+ * GSOCK_OUTPUT:
+ * The socket is available for writing. That is, the next write call
+ * won't block. This event is generated only once, when the connection is
+ * first established, and then only if a call failed with GSOCK_WOULDBLOCK,
+ * when the output buffer empties again. This means that the app should
+ * assume that it can write since the first OUTPUT event, and no more
+ * OUTPUT events will be generated unless an error occurs.
+ * GSOCK_CONNECTION:
+ * Connection succesfully established, for client sockets, or incoming
+ * client connection, for server sockets. Wait for this event (also watch
+ * out for GSOCK_LOST) after you issue a nonblocking GSocket_Connect() call.
+ * GSOCK_LOST:
+ * The connection is lost (or a connection request failed); this could
+ * be due to a failure, or due to the peer closing it gracefully.
*/
/* GSocket_SetCallback:
*/
void GSocket_UnsetCallback(GSocket *socket, GSocketEventFlags flags);
+
/* GAddress */
GAddress *GAddress_new();
*/
GSocketError GAddress_INET_SetHostName(GAddress *address, const char *hostname);
+GSocketError GAddress_INET_SetAnyAddress(GAddress *address);
GSocketError GAddress_INET_SetHostAddress(GAddress *address,
unsigned long hostaddr);
GSocketError GAddress_INET_SetPortName(GAddress *address, const char *port,
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