include/wx/gsocket.h

   1 /* -------------------------------------------------------------------------
   2  * Project: GSocket (Generic Socket)
   3  * Name:    gsocket.h
   4  * Author:  Guilhem Lavaux
   5  *          Guillermo Rodriguez Garcia <guille@iies.es> (maintainer)
   6  * Purpose: GSocket include file (system independent)
   7  * CVSID:   $Id$
   8  * -------------------------------------------------------------------------
   9  */
  10
  11 #ifndef __GSOCKET_H
  12 #define __GSOCKET_H
  13
  14 #ifndef __GSOCKET_STANDALONE__
  15 #include "wx/setup.h"
  16
  17 // kludge for GTK..  gsockgtk.c craps out miserably if we include
  18 // defs.h ...  no idea how other files get away with it..
  19
  20 #if !defined( __WXMSW__ ) && !defined(  WXDLLEXPORT )
  21 #define WXDLLEXPORT
  22 #endif
  23
  24 #endif
  25
  26 #if wxUSE_SOCKETS || defined(__GSOCKET_STANDALONE__)
  27
  28 #include <stddef.h>
  29 #ifndef __WXMAC__
  30 #include <sys/types.h>
  31 #endif
  32
  33 #ifdef __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 typedef struct _GSocket GSocket;
  38 typedef struct _GAddress GAddress;
  39
  40 typedef enum {
  41   GSOCK_NOFAMILY = 0,
  42   GSOCK_INET,
  43   GSOCK_INET6,
  44   GSOCK_UNIX
  45 } GAddressType;
  46
  47 typedef enum {
  48   GSOCK_STREAMED,
  49   GSOCK_UNSTREAMED
  50 } GSocketStream;
  51
  52 typedef enum {
  53   GSOCK_NOERROR = 0,
  54   GSOCK_INVOP,
  55   GSOCK_IOERR,
  56   GSOCK_INVADDR,
  57   GSOCK_INVSOCK,
  58   GSOCK_NOHOST,
  59   GSOCK_INVPORT,
  60   GSOCK_WOULDBLOCK,
  61   GSOCK_TIMEDOUT,
  62   GSOCK_MEMERR
  63 } GSocketError;
  64
  65 /* See below for an explanation on how events work.
  66  */
  67 typedef enum {
  68   GSOCK_INPUT  = 0,
  69   GSOCK_OUTPUT = 1,
  70   GSOCK_CONNECTION = 2,
  71   GSOCK_LOST = 3,
  72   GSOCK_MAX_EVENT = 4
  73 } GSocketEvent;
  74
  75 enum {
  76   GSOCK_INPUT_FLAG = 1 << GSOCK_INPUT,
  77   GSOCK_OUTPUT_FLAG = 1 << GSOCK_OUTPUT,
  78   GSOCK_CONNECTION_FLAG = 1 << GSOCK_CONNECTION,
  79   GSOCK_LOST_FLAG = 1 << GSOCK_LOST
  80 };
  81
  82 typedef int GSocketEventFlags;
  83
  84 typedef void (*GSocketCallback)(GSocket *socket, GSocketEvent event,
  85                                 char *cdata);
  86
  87
  88 /* Global initializers */
  89
  90 /* GSocket_Init() must be called at the beginning */
  91 int GSocket_Init(void);
  92
  93 /* GSocket_Cleanup() must be called at the end */
  94 void GSocket_Cleanup(void);
  95
  96
  97 /* Constructors / Destructors */
  98
  99 GSocket *GSocket_new(void);
 100 void GSocket_destroy(GSocket *socket);
 101
 102
 103
 104 /* GSocket_Shutdown:
 105  *  Disallow further read/write operations on this socket, close
 106  *  the fd and disable all callbacks.
 107  */
 108 void GSocket_Shutdown(GSocket *socket);
 109
 110 /* Address handling */
 111
 112 /* GSocket_SetLocal:
 113  * GSocket_GetLocal:
 114  * GSocket_SetPeer:
 115  * GSocket_GetPeer:
 116  *  Set or get the local or peer address for this socket. The 'set'
 117  *  functions return GSOCK_NOERROR on success, an error code otherwise.
 118  *  The 'get' functions return a pointer to a GAddress object on success,
 119  *  or NULL otherwise, in which case they set the error code of the
 120  *  corresponding GSocket.
 121  *
 122  *  Error codes:
 123  *    GSOCK_INVSOCK - the socket is not valid.
 124  *    GSOCK_INVADDR - the address is not valid.
 125  */
 126 GSocketError GSocket_SetLocal(GSocket *socket, GAddress *address);
 127 GSocketError GSocket_SetPeer(GSocket *socket, GAddress *address);
 128 GAddress *GSocket_GetLocal(GSocket *socket);
 129 GAddress *GSocket_GetPeer(GSocket *socket);
 130
 131 /* Server specific parts */
 132
 133 /* GSocket_SetServer:
 134  *  Sets up this socket as a server. The local address must have been
 135  *  set with GSocket_SetLocal() before GSocket_SetServer() is called.
 136  *  Returns GSOCK_NOERROR on success, one of the following otherwise:
 137  *
 138  *  Error codes:
 139  *    GSOCK_INVSOCK - the socket is in use.
 140  *    GSOCK_INVADDR - the local address has not been set.
 141  *    GSOCK_IOERR   - low-level error.
 142  */
 143 GSocketError GSocket_SetServer(GSocket *socket);
 144
 145 /* GSocket_WaitConnection:
 146  *  Waits for an incoming client connection. Returns a pointer to
 147  *  a GSocket object, or NULL if there was an error, in which case
 148  *  the last error field will be updated for the calling GSocket.
 149  *
 150  *  Error codes (set in the calling GSocket)
 151  *    GSOCK_INVSOCK    - the socket is not valid or not a server.
 152  *    GSOCK_TIMEDOUT   - timeout, no incoming connections.
 153  *    GSOCK_WOULDBLOCK - the call would block and the socket is nonblocking.
 154  *    GSOCK_MEMERR     - couldn't allocate memory.
 155  *    GSOCK_IOERR      - low-level error.
 156  */
 157 GSocket *GSocket_WaitConnection(GSocket *socket);
 158
 159
 160 /* Client specific parts */
 161
 162 /* GSocket_Connect:
 163  *  For stream (connection oriented) sockets, GSocket_Connect() tries
 164  *  to establish a client connection to a server using the peer address
 165  *  as established with GSocket_SetPeer(). Returns GSOCK_NOERROR if the
 166  *  connection has been succesfully established, or one of the error
 167  *  codes listed below. Note that for nonblocking sockets, a return
 168  *  value of GSOCK_WOULDBLOCK doesn't mean a failure. The connection
 169  *  request can be completed later; you should use GSocket_Select()
 170  *  to poll for GSOCK_CONNECTION | GSOCK_LOST, or wait for the
 171  *  corresponding asynchronous events.
 172  *
 173  *  For datagram (non connection oriented) sockets, GSocket_Connect()
 174  *  just sets the peer address established with GSocket_SetPeer() as
 175  *  default destination.
 176  *
 177  *  Error codes:
 178  *    GSOCK_INVSOCK    - the socket is in use or not valid.
 179  *    GSOCK_INVADDR    - the peer address has not been established.
 180  *    GSOCK_TIMEDOUT   - timeout, the connection failed.
 181  *    GSOCK_WOULDBLOCK - connection in progress (nonblocking sockets only)
 182  *    GSOCK_MEMERR     - couldn't allocate memory.
 183  *    GSOCK_IOERR      - low-level error.
 184  */
 185 GSocketError GSocket_Connect(GSocket *socket, GSocketStream stream);
 186
 187
 188 /* Datagram sockets */
 189
 190 /* GSocket_SetNonOriented:
 191  *  Sets up this socket as a non-connection oriented (datagram) socket.
 192  *  Before using this function, the local address must have been set
 193  *  with GSocket_SetLocal(), or the call will fail. Returns GSOCK_NOERROR
 194  *  on success, or one of the following otherwise.
 195  *
 196  *  Error codes:
 197  *    GSOCK_INVSOCK - the socket is in use.
 198  *    GSOCK_INVADDR - the local address has not been set.
 199  *    GSOCK_IOERR   - low-level error.
 200  */
 201 GSocketError GSocket_SetNonOriented(GSocket *socket);
 202
 203
 204 /* Generic IO */
 205
 206 /* Like recv(), send(), ... */
 207
 208 /* For datagram sockets, the incoming / outgoing addresses
 209  * are stored as / read from the 'peer' address field.
 210  */
 211 int GSocket_Read(GSocket *socket, char *buffer, int size);
 212 int GSocket_Write(GSocket *socket, const char *buffer,
 213                   int size);
 214
 215 /* GSocket_Select:
 216  *  Polls the socket to determine its status. This function will
 217  *  check for the events specified in the 'flags' parameter, and
 218  *  it will return a mask indicating which operations can be
 219  *  performed. This function won't block, regardless of the
 220  *  mode (blocking | nonblocking) of the socket.
 221  */
 222 GSocketEventFlags GSocket_Select(GSocket *socket, GSocketEventFlags flags);
 223
 224
 225 /* Attributes */
 226
 227 /* GSocket_SetNonBlocking:
 228  *  Sets the socket to non-blocking mode. All IO calls will return
 229  *  immediately.
 230  */
 231 void GSocket_SetNonBlocking(GSocket *socket, int non_block);
 232
 233 /* GSocket_SetTimeout:
 234  *  Sets the timeout for blocking calls. Time is expressed in
 235  *  milliseconds.
 236  */
 237 void GSocket_SetTimeout(GSocket *socket, unsigned long millisec);
 238
 239 /* GSocket_GetError:
 240  *  Returns the last error occured for this socket. Note that successful
 241  *  operations do not clear this back to GSOCK_NOERROR, so use it only
 242  *  after an error.
 243  */
 244 GSocketError WXDLLEXPORT GSocket_GetError(GSocket *socket);
 245
 246
 247 /* Callbacks */
 248
 249 /* GSOCK_INPUT:
 250  *   There is data to be read in the input buffer. If, after a read
 251  *   operation, there is still data available, the callback function will
 252  *   be called again.
 253  * GSOCK_OUTPUT:
 254  *   The socket is available for writing. That is, the next write call
 255  *   won't block. This event is generated only once, when the connection is
 256  *   first established, and then only if a call failed with GSOCK_WOULDBLOCK,
 257  *   when the output buffer empties again. This means that the app should
 258  *   assume that it can write since the first OUTPUT event, and no more
 259  *   OUTPUT events will be generated unless an error occurs.
 260  * GSOCK_CONNECTION:
 261  *   Connection succesfully established, for client sockets, or incoming
 262  *   client connection, for server sockets. Wait for this event (also watch
 263  *   out for GSOCK_LOST) after you issue a nonblocking GSocket_Connect() call.
 264  * GSOCK_LOST:
 265  *   The connection is lost (or a connection request failed); this could
 266  *   be due to a failure, or due to the peer closing it gracefully.
 267  */
 268
 269 /* GSocket_SetCallback:
 270  *  Enables the callbacks specified by 'flags'. Note that 'flags'
 271  *  may be a combination of flags OR'ed toghether, so the same
 272  *  callback function can be made to accept different events.
 273  *  The callback function must have the following prototype:
 274  *
 275  *  void function(GSocket *socket, GSocketEvent event, char *cdata)
 276  */
 277 void GSocket_SetCallback(GSocket *socket, GSocketEventFlags flags,
 278                          GSocketCallback fallback, char *cdata);
 279
 280 /* GSocket_UnsetCallback:
 281  *  Disables all callbacks specified by 'flags', which may be a
 282  *  combination of flags OR'ed toghether.
 283  */
 284 void GSocket_UnsetCallback(GSocket *socket, GSocketEventFlags flags);
 285
 286
 287 /* GAddress */
 288
 289 GAddress *GAddress_new(void);
 290 GAddress *GAddress_copy(GAddress *address);
 291 void GAddress_destroy(GAddress *address);
 292
 293 void GAddress_SetFamily(GAddress *address, GAddressType type);
 294 GAddressType GAddress_GetFamily(GAddress *address);
 295
 296 /* The use of any of the next functions will set the address family to
 297  * the specific one. For example if you use GAddress_INET_SetHostName,
 298  * address family will be implicitly set to AF_INET.
 299  */
 300
 301 GSocketError GAddress_INET_SetHostName(GAddress *address, const char *hostname);
 302 GSocketError GAddress_INET_SetAnyAddress(GAddress *address);
 303 GSocketError GAddress_INET_SetHostAddress(GAddress *address,
 304                                           unsigned long hostaddr);
 305 GSocketError GAddress_INET_SetPortName(GAddress *address, const char *port,
 306                                        const char *protocol);
 307 GSocketError GAddress_INET_SetPort(GAddress *address, unsigned short port);
 308
 309 GSocketError GAddress_INET_GetHostName(GAddress *address, char *hostname,
 310                                        size_t sbuf);
 311 unsigned long GAddress_INET_GetHostAddress(GAddress *address);
 312 unsigned short GAddress_INET_GetPort(GAddress *address);
 313
 314 /* TODO: Define specific parts (INET6, UNIX) */
 315
 316 GSocketError GAddress_UNIX_SetPath(GAddress *address, const char *path);
 317 GSocketError GAddress_UNIX_GetPath(GAddress *address, char *path, size_t sbuf);
 318
 319 #ifdef __cplusplus
 320 }
 321 #endif /* __cplusplus */
 322
 323
 324 #endif    /* wxUSE_SOCKETS || defined(__GSOCKET_STANDALONE__) */
 325
 326 #endif    /* __GSOCKET_H */