/* -------------------------------------------------------------------------
* 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
-#include <sys/types.h>
+#ifndef __GSOCKET_STANDALONE__
+#include "wx/setup.h"
+#endif
-#if !defined(__cplusplus)
+#if wxUSE_SOCKETS || defined(__GSOCKET_STANDALONE__)
-typedef int bool;
+#include <stddef.h>
+#include <sys/types.h>
+#if !defined(__cplusplus)
+typedef unsigned int bool;
#endif
#ifndef TRUE
#define FALSE 0
#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
typedef struct _GSocket GSocket;
typedef struct _GAddress GAddress;
GSOCK_INVADDR,
GSOCK_INVSOCK,
GSOCK_NOHOST,
- GSOCK_INVPORT
+ GSOCK_INVPORT,
+ GSOCK_WOULDBLOCK,
+ GSOCK_TIMEDOUT,
+ GSOCK_MEMERR
} GSocketError;
+/* See below for an explanation on how events work.
+ */
typedef enum {
GSOCK_INPUT = 0,
GSOCK_OUTPUT = 1,
typedef int GSocketEventFlags;
-typedef void (*GSocketFallback)(GSocket *socket, GSocketEvent event,
+typedef void (*GSocketCallback)(GSocket *socket, GSocketEvent event,
char *cdata);
-#ifdef __cplusplus
-extern "C" {
-#endif
-/* Global initialisers */
+/* Global initializers */
/* 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 IO calls to this socket but errors are still available */
+
+
+/* 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() setup the socket as a server. It uses the "Local" field
- of GSocket. "Local" must be set by GSocket_SetLocal() before
- GSocket_SetServer() is called. In the other case, it returns GSOCK_INVADDR.
-*/
+/* GSocket_SetServer:
+ * 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.
-*/
+/* GSocket_WaitConnection:
+ * 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. In the other case, it returns GSOCK_INVADDR.
-*/
+/* GSocket_Connect:
+ * 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,
int size);
-bool GSocket_DataAvailable(GSocket *socket);
-/* Flags */
+/* GSocket_Select:
+ * Polls the socket to determine its status. This function will
+ * 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.
+ */
+GSocketEventFlags GSocket_Select(GSocket *socket, GSocketEventFlags flags);
-/*
- GSocket_SetBlocking() puts the socket in non-blocking mode. This is useful
- if we don't want to wait.
-*/
-void GSocket_SetBlocking(GSocket *socket, bool block);
-/*
- GSocket_GetError() returns the last error occured on the socket stream.
-*/
+/* Attributes */
+/* GSocket_SetNonBlocking:
+ * 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. 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 fallback is possible for each event (INPUT, OUTPUT, CONNECTION, LOST)
- INPUT: The function is called when there is at least a byte in the
- input buffer
- OUTPUT: The function is called when the system is sure the next write call
- will not block
- CONNECTION: Two cases is possible:
- Client socket -> the connection is established
- Server socket -> a client request a connection
- LOST: the connection is lost
-
- SetFallback accepts a combination of these flags so a same callback can
- receive different events.
-
- 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()
-*/
-void GSocket_SetFallback(GSocket *socket, GSocketEventFlags event,
- GSocketFallback fallback, char *cdata);
-
-/*
- UnsetFallback will disables all fallbacks specified by "event".
- NOTE: event may be a combination of flags
-*/
-void GSocket_UnsetFallback(GSocket *socket, GSocketEventFlags event);
+/* 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:
+ * Enables the callbacks specified by 'flags'. Note that 'flags'
+ * may be a combination of flags OR'ed toghether, so the same
+ * callback function can be made to accept different events.
+ * The callback function must have the following prototype:
+ *
+ * void function(GSocket *socket, GSocketEvent event, char *cdata)
+ */
+void GSocket_SetCallback(GSocket *socket, GSocketEventFlags flags,
+ GSocketCallback fallback, char *cdata);
+
+/* GSocket_UnsetCallback:
+ * Disables all callbacks specified by 'flags', which may be a
+ * combination of flags OR'ed toghether.
+ */
+void GSocket_UnsetCallback(GSocket *socket, GSocketEventFlags flags);
+
/* GAddress */
void GAddress_SetFamily(GAddress *address, GAddressType type);
GAddressType GAddress_GetFamily(GAddress *address);
-/*
- The use of any of the next functions will set the address family to the adapted
- one. For example if you use GAddress_INET_SetHostName, address family will be AF_INET
- implicitely
-*/
+/* The use of any of the next functions will set the address family to
+ * the specific one. For example if you use GAddress_INET_SetHostName,
+ * address family will be implicitly set to AF_INET.
+ */
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,
GSocketError GAddress_UNIX_SetPath(GAddress *address, const char *path);
GSocketError GAddress_UNIX_GetPath(GAddress *address, char *path, size_t sbuf);
-/*
- * System specific functions
- */
-
-/* On systems needing an event id */
-void GSocket_SetEventID(GSocket *socket, unsigned long evt_id);
-
-/* On systems which don't have background refresh */
-void GSocket_DoEvent(unsigned long evt_id);
-
#ifdef __cplusplus
};
-#endif
+#endif /* __cplusplus */
-#endif
- /* __GSOCKET_H */
+
+#endif /* wxUSE_SOCKETS || defined(__GSOCKET_STANDALONE__) */
+
+#endif /* __GSOCKET_H */
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