Implement monitoring of file descriptors in wxMotif event loop.

[wxWidgets.git] / interface / wx / socket.h

diff --git a/interface/wx/socket.h b/interface/wx/socket.h
index 67e2e117258dfd3ce52186fc1062d45858dbb33d..6c2f80060d810bb922b99a267a380b6a12e3397c 100644 (file)
--- a/interface/wx/socket.h
+++ b/interface/wx/socket.h
@@ -3,10 +3,20 @@
 // Purpose:     interface of wxIP*address, wxSocket* classes
 // Author:      wxWidgets team
 // RCS-ID:      $Id$
 // Purpose:     interface of wxIP*address, wxSocket* classes
 // Author:      wxWidgets team
 // RCS-ID:      $Id$

-// Licence:     wxWindows license
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 
 /////////////////////////////////////////////////////////////////////////////
 
 

+/**
+    The type of the native socket.
+
+    Notice that the definition below is simplified and this type is not always
+    int, e.g. it is a 64 bit integer type under Win64.
+
+    @since 2.9.5
+  */
+typedef int wxSOCKET_T;
+

 /**
     @class wxIPaddress
 
 /**
     @class wxIPaddress
 


@@ -14,7 +24,7 @@
     objects. Currently, only wxIPV4address is implemented. An experimental
     implementation for IPV6, wxIPV6address, is being developed.
 
     objects. Currently, only wxIPV4address is implemented. An experimental
     implementation for IPV6, wxIPV6address, is being developed.
 

-    @library{wxbase}
+    @library{wxnet}

     @category{net}
 */
 class wxIPaddress : public wxSockAddress
     @category{net}
 */
 class wxIPaddress : public wxSockAddress


@@ -103,7 +113,7 @@ public:
 
     A class for working with IPv4 network addresses.
 
 
     A class for working with IPv4 network addresses.
 

-    @library{wxbase}
+    @library{wxnet}

     @category{net}
 */
 class wxIPV4address : public wxIPaddress
     @category{net}
 */
 class wxIPV4address : public wxIPaddress


@@ -400,7 +410,7 @@ public:
 
     You are unlikely to need to use this class: only wxSocketBase uses it.
 
 
     You are unlikely to need to use this class: only wxSocketBase uses it.
 

-    @library{wxbase}
+    @library{wxnet}

     @category{net}
 
     @see wxSocketBase, wxIPaddress, wxIPV4address
     @category{net}
 
     @see wxSocketBase, wxIPaddress, wxIPV4address


@@ -427,6 +437,26 @@ public:
         Returns the length of the socket address.
     */
     int SockAddrLen();
         Returns the length of the socket address.
     */
     int SockAddrLen();

+
+    /**
+        Returns the pointer to the low-level representation of the address.
+
+        This can be used to pass socket address information to a 3rd party
+        library.
+
+        @return
+            Pointer to a sockaddr-derived struct.
+    */
+    const sockaddr *GetAddressData() const;
+
+    /**
+        Returns the length of the buffer retrieved by GetAddressData().
+
+        @return
+            The size of the sockaddr-derived struct corresponding to this
+            address.
+    */
+    int GetAddressDataLen() const;

 };
 
 
 };
 
 


@@ -435,10 +465,12 @@ public:
     @class wxSocketEvent
 
     This event class contains information about socket events.
     @class wxSocketEvent
 
     This event class contains information about socket events.

+    This kind of events are sent to the event handler specified with
+    wxSocketBase::SetEventHandler.

 
     @beginEventTable{wxSocketEvent}
     @event{EVT_SOCKET(id, func)}
 
     @beginEventTable{wxSocketEvent}
     @event{EVT_SOCKET(id, func)}

-           Process a socket event, supplying the member function.
+        Process a socket event, supplying the member function.

     @endEventTable
 
     @library{wxnet}
     @endEventTable
 
     @library{wxnet}


@@ -550,7 +582,32 @@ enum wxSocketEventFlags
     in the output buffer. This is the same as issuing exactly one nonblocking
     low-level call to @b recv() or @b send(). Note that @e nonblocking here
     refers to when the function returns, not to whether the GUI blocks during
     in the output buffer. This is the same as issuing exactly one nonblocking
     low-level call to @b recv() or @b send(). Note that @e nonblocking here
     refers to when the function returns, not to whether the GUI blocks during

-    this time.
+    this time.  Also note that this flag impacts both Read and Write
+    operations.  If it is desired to control Read independently of Write, for
+    example you want no wait on Read(), but you do want to wait on Write(), then
+    use wxSOCKET_NOWAIT_READ and wxSOCKET_NOWAIT_WRITE.
+
+    If @b wxSOCKET_NOWAIT_READ (this flag is new since wxWidgets 2.9.5) is
+    specified, Read operations will return immediately. Read operations will
+    retrieve only available data. This is the same as issuing exactly one
+    nonblocking low-level call to @b recv(). Note that @e nonblocking here
+    refers to when the function returns, not to whether the GUI blocks during
+    this time.  This flag should not be enabled if ReadMsg() is going to be
+    used (it will be ignored), if you do then thread-safety may be at risk.
+    Note that wxSOCKET_NOWAIT_READ impacts only Read operations and does not
+    impact Write operations, allowing Read and Write operations to be set
+    differently.
+
+    If @b wxSOCKET_NOWAIT_WRITE (this flag is new since wxWidgets 2.9.5) is
+    specified, Write operations will return immediately. Write operations will
+    write as much data as possible, depending on how much space is available in
+    the output buffer. This is the same as issuing exactly one nonblocking
+    low-level call to @b send(). Note that @e nonblocking here refers to when
+    the function returns, not to whether the GUI blocks during this time.  This
+    flag should not be enabled if WriteMsg() is going to be used (it will be
+    ignored), if you use it then thread safety may be at risk. Note that
+    wxSOCKET_NOWAIT_WRITE impacts only Write operations and does not impact
+    Write operations, allowing Read and Write operations to be set differently.

 
     If @b wxSOCKET_WAITALL is specified, IO calls won't return until ALL
     the data has been read or written (or until an error occurs), blocking if
 
     If @b wxSOCKET_WAITALL is specified, IO calls won't return until ALL
     the data has been read or written (or until an error occurs), blocking if


@@ -558,7 +615,32 @@ enum wxSocketEventFlags
     same as having a loop which makes as many blocking low-level calls to
     @b recv() or @b send() as needed so as to transfer all the data. Note
     that @e blocking here refers to when the function returns, not
     same as having a loop which makes as many blocking low-level calls to
     @b recv() or @b send() as needed so as to transfer all the data. Note
     that @e blocking here refers to when the function returns, not

-    to whether the GUI blocks during this time.
+    to whether the GUI blocks during this time.  Note that wxSOCKET_WAITALL
+    impacts both Read and Write operations.  If you desire to wait
+    for all on just Read operations, but not on Write operations, (or vice versa),
+    use wxSOCKET_WAITALL_READ or wxSOCKET_WAITALL_WRITE.
+
+    If @b wxSOCKET_WAITALL_READ (this flag is new since wxWidgets 2.9.5) is
+    specified, Read operations won't return until ALL the data has been read
+    (or until an error occurs), blocking if necessary, and issuing several low
+    level calls if necessary. This is the same as having a loop which makes as
+    many blocking low-level calls to @b recv() as needed so as to transfer all
+    the data. Note that @e blocking here refers to when the function returns,
+    not to whether the GUI blocks during this time.  Note that
+    wxSOCKET_WAITALL_READ only has an impact on Read operations, and has no
+    impact on Write operations, allowing Read and Write operations to have
+    different settings.
+
+    If @b wxSOCKET_WAITALL_WRITE (this flag is new since wxWidgets 2.9.5) is
+    specified, Write() and WriteMsg() calls won't return until ALL the data has
+    been written (or until an error occurs), blocking if necessary, and issuing
+    several low level calls if necessary. This is the same as having a loop
+    which makes as many blocking low-level calls to @b send() as needed so as
+    to transfer all the data. Note that @e blocking here refers to when the
+    function returns, not to whether the GUI blocks during this time.  Note
+    that wxSOCKET_WAITALL_WRITE only has an impact on Write operations, and has
+    no impact on Read operations, allowing Read and Write operations to have
+    different settings.

 
     The @b wxSOCKET_BLOCK flag controls whether the GUI blocks during
     IO operations. If this flag is specified, the socket will not yield
 
     The @b wxSOCKET_BLOCK flag controls whether the GUI blocks during
     IO operations. If this flag is specified, the socket will not yield


@@ -574,7 +656,7 @@ enum wxSocketEventFlags
 
     @b wxSOCKET_REUSEADDR can also be used with socket clients to (re)bind to a
     particular local port for an outgoing connection.
 
     @b wxSOCKET_REUSEADDR can also be used with socket clients to (re)bind to a
     particular local port for an outgoing connection.

-    This option can have surprising platform dependent behavior, so check the
+    This option can have surprising platform dependent behaviour, so check the

     documentation for your platform's implementation of setsockopt().
 
     Note that on BSD-based systems(e.g. Mac OS X), use of
     documentation for your platform's implementation of setsockopt().
 
     Note that on BSD-based systems(e.g. Mac OS X), use of


@@ -594,7 +676,7 @@ enum wxSocketEventFlags
       the data.
     - @b wxSOCKET_BLOCK has nothing to do with the previous flags and
       it controls whether the GUI blocks.
       the data.
     - @b wxSOCKET_BLOCK has nothing to do with the previous flags and
       it controls whether the GUI blocks.

-    - @b wxSOCKET_REUSEADDR controls special platform-specific behavior for
+    - @b wxSOCKET_REUSEADDR controls special platform-specific behaviour for

       reusing local addresses/ports.
 */
 enum
       reusing local addresses/ports.
 */
 enum


@@ -603,11 +685,15 @@ enum
     wxSOCKET_NOWAIT = 1,    ///< Read/write as much data as possible and return immediately.
     wxSOCKET_WAITALL = 2,   ///< Wait for all required data to be read/written unless an error occurs.
     wxSOCKET_BLOCK = 4,     ///< Block the GUI (do not yield) while reading/writing data.
     wxSOCKET_NOWAIT = 1,    ///< Read/write as much data as possible and return immediately.
     wxSOCKET_WAITALL = 2,   ///< Wait for all required data to be read/written unless an error occurs.
     wxSOCKET_BLOCK = 4,     ///< Block the GUI (do not yield) while reading/writing data.

-    wxSOCKET_REUSEADDR = 8, ///< Allows the use of an in-use port (wxServerSocket only)
+    wxSOCKET_REUSEADDR = 8, ///< Allows the use of an in-use port.

     wxSOCKET_BROADCAST = 16, ///< Switches the socket to broadcast mode
     wxSOCKET_BROADCAST = 16, ///< Switches the socket to broadcast mode

-    wxSOCKET_NOBIND = 32    ///< Stops the socket from being bound to a specific
+    wxSOCKET_NOBIND = 32,   ///< Stops the socket from being bound to a specific

                             ///< adapter (normally used in conjunction with
                             ///< @b wxSOCKET_BROADCAST)
                             ///< adapter (normally used in conjunction with
                             ///< @b wxSOCKET_BROADCAST)

+    wxSOCKET_NOWAIT_READ = 64,    ///< Read as much data as possible and return immediately
+    wxSOCKET_WAITALL_READ = 128,  ///< Wait for all required data to be read unless an error occurs.
+    wxSOCKET_NOWAIT_WRITE = 256,   ///< Write as much data as possible and return immediately
+    wxSOCKET_WAITALL_WRITE = 512   ///< Wait for all required data to be written unless an error occurs.

 };
 
 
 };
 
 


@@ -622,7 +708,7 @@ enum
     wxFTP or wxHTTP in another thread) you must initialize the sockets from the
     main thread by calling Initialize() before creating the other ones.
 
     wxFTP or wxHTTP in another thread) you must initialize the sockets from the
     main thread by calling Initialize() before creating the other ones.
 

-    @beginEventTable{wxSocketEvent}
+    @beginEventEmissionTable{wxSocketEvent}

     @event{EVT_SOCKET(id, func)}
         Process a @c wxEVT_SOCKET event.
         See @ref wxSocketEventFlags and @ref wxSocketFlags for more info.
     @event{EVT_SOCKET(id, func)}
         Process a @c wxEVT_SOCKET event.
         See @ref wxSocketEventFlags and @ref wxSocketFlags for more info.


@@ -688,6 +774,8 @@ public:
         does anything) but you must call Shutdown() exactly once for every call
         to Initialize().
 
         does anything) but you must call Shutdown() exactly once for every call
         to Initialize().
 

+        This function should only be called from the main thread.
+

         @return
             @true if the sockets can be used, @false if the initialization
             failed and sockets are not available at all.
         @return
             @true if the sockets can be used, @false if the initialization
             failed and sockets are not available at all.


@@ -699,6 +787,9 @@ public:
 
         This function undoes the call to Initialize() and must be called after
         every successful call to Initialize().
 
         This function undoes the call to Initialize() and must be called after
         every successful call to Initialize().

+
+        This function should only be called from the main thread, just as
+        Initialize().

      */
     static void Shutdown();
 
      */
     static void Shutdown();
 


@@ -777,9 +868,42 @@ public:
         Use this function to get the number of bytes actually transferred
         after using one of the following IO calls: Discard(), Peek(), Read(),
         ReadMsg(), Unread(), Write(), WriteMsg().
         Use this function to get the number of bytes actually transferred
         after using one of the following IO calls: Discard(), Peek(), Read(),
         ReadMsg(), Unread(), Write(), WriteMsg().

+
+        @deprecated
+        This function is kept mostly for backwards compatibility.  Use
+        LastReadCount() or LastWriteCount() instead.  LastCount() is still
+        needed for use with less commonly used functions: Discard(),
+        Peek(), and Unread().

     */
     wxUint32 LastCount() const;
 
     */
     wxUint32 LastCount() const;
 

+    /**
+        Returns the number of bytes read by the last Read() or ReadMsg()
+        call (receive direction only).
+
+        This function is thread-safe, in case Read() is executed in a
+        different thread than Write().  Use LastReadCount() instead of
+        LastCount() for this reason.
+
+        Unlike LastCount(), the functions Discard(), Peek(), and Unread()
+        are currently not supported by LastReadCount().
+
+        @since 2.9.5
+    */
+    wxUint32 LastReadCount() const;
+
+    /**
+        Returns the number of bytes written by the last Write() or WriteMsg()
+        call (transmit direction only).
+
+        This function is thread-safe, in case Write() is executed in a
+        different thread than Read().  Use LastWriteCount() instead of
+        LastCount() for this reason.
+
+        @since 2.9.5
+    */
+    wxUint32 LastWriteCount() const;
+

     /**
         Returns the last wxSocket error. See @ref wxSocketError .
 
     /**
         Returns the last wxSocket error. See @ref wxSocketError .
 


@@ -909,7 +1033,7 @@ public:
     /**
         Read up to the given number of bytes from the socket.
 
     /**
         Read up to the given number of bytes from the socket.
 

-        Use LastCount() to verify the number of bytes actually read.
+        Use LastReadCount() to verify the number of bytes actually read.

         Use Error() to determine if the operation succeeded.
 
         @param buffer
         Use Error() to determine if the operation succeeded.
 
         @param buffer


@@ -923,7 +1047,7 @@ public:
             The exact behaviour of Read() depends on the combination of flags being used.
             For a detailed explanation, see SetFlags()
 
             The exact behaviour of Read() depends on the combination of flags being used.
             For a detailed explanation, see SetFlags()
 

-        @see Error(), LastError(), LastCount(),
+        @see Error(), LastError(), LastReadCount(),

              SetFlags()
     */
     wxSocketBase& Read(void* buffer, wxUint32 nbytes);
              SetFlags()
     */
     wxSocketBase& Read(void* buffer, wxUint32 nbytes);


@@ -935,7 +1059,7 @@ public:
         bytes will be discarded. This function always waits for the buffer to
         be entirely filled, unless an error occurs.
 
         bytes will be discarded. This function always waits for the buffer to
         be entirely filled, unless an error occurs.
 

-        Use LastCount() to verify the number of bytes actually read.
+        Use LastReadCount() to verify the number of bytes actually read.

 
         Use Error() to determine if the operation succeeded.
 
 
         Use Error() to determine if the operation succeeded.
 


@@ -951,8 +1075,15 @@ public:
             and it will always ignore the @b wxSOCKET_NOWAIT flag.
             The exact behaviour of ReadMsg() depends on the @b wxSOCKET_BLOCK flag.
             For a detailed explanation, see SetFlags().
             and it will always ignore the @b wxSOCKET_NOWAIT flag.
             The exact behaviour of ReadMsg() depends on the @b wxSOCKET_BLOCK flag.
             For a detailed explanation, see SetFlags().

+            For thread safety, in case ReadMsg() and WriteMsg() are called in
+            different threads, it is a good idea to call
+            SetFlags(wxSOCKET_WAITALL|wx_SOCKET_BLOCK) before the first calls
+            to ReadMsg() and WriteMsg() in different threads, as each of these
+            functions will call SetFlags() which performs read/modify/write.  By
+            setting these flags before the multi-threading, it will ensure that
+            they don't get reset by thread race conditions.

 
 

-        @see Error(), LastError(), LastCount(), SetFlags(), WriteMsg()
+        @see Error(), LastError(), LastReadCount(), SetFlags(), WriteMsg()

     */
     wxSocketBase& ReadMsg(void* buffer, wxUint32 nbytes);
 
     */
     wxSocketBase& ReadMsg(void* buffer, wxUint32 nbytes);
 


@@ -1136,7 +1267,7 @@ public:
     /**
         Write up to the given number of bytes to the socket.
 
     /**
         Write up to the given number of bytes to the socket.
 

-        Use LastCount() to verify the number of bytes actually written.
+        Use LastWriteCount() to verify the number of bytes actually written.

 
         Use Error() to determine if the operation succeeded.
 
 
         Use Error() to determine if the operation succeeded.
 


@@ -1152,7 +1283,7 @@ public:
         The exact behaviour of Write() depends on the combination of flags being used.
         For a detailed explanation, see SetFlags().
 
         The exact behaviour of Write() depends on the combination of flags being used.
         For a detailed explanation, see SetFlags().
 

-        @see Error(), LastError(), LastCount(), SetFlags()
+        @see Error(), LastError(), LastWriteCount(), SetFlags()

     */
     wxSocketBase& Write(const void* buffer, wxUint32 nbytes);
 
     */
     wxSocketBase& Write(const void* buffer, wxUint32 nbytes);
 


@@ -1165,7 +1296,7 @@ public:
         This function always waits for the entire buffer to be sent, unless an
         error occurs.
 
         This function always waits for the entire buffer to be sent, unless an
         error occurs.
 

-        Use LastCount() to verify the number of bytes actually written.
+        Use LastWriteCount() to verify the number of bytes actually written.

 
         Use Error() to determine if the operation succeeded.
 
 
         Use Error() to determine if the operation succeeded.
 


@@ -1182,8 +1313,15 @@ public:
         it will always ignore the @b wxSOCKET_NOWAIT flag. The exact behaviour of
         WriteMsg() depends on the @b wxSOCKET_BLOCK flag. For a detailed explanation,
         see SetFlags().
         it will always ignore the @b wxSOCKET_NOWAIT flag. The exact behaviour of
         WriteMsg() depends on the @b wxSOCKET_BLOCK flag. For a detailed explanation,
         see SetFlags().

+        For thread safety, in case ReadMsg() and WriteMsg() are called in
+        different threads, it is a good idea to call
+        @code SetFlags(wxSOCKET_WAITALL|wx_SOCKET_BLOCK) @endcode before the
+        first calls to ReadMsg() and WriteMsg() in different threads, as each
+        of these functions calls SetFlags() which performs read/modify/write.
+        By setting these flags before the multi-threading, it will ensure that
+        they don't get reset by thread race conditions.

 
 

-        @see  Error(), LastError(), LastCount(), SetFlags(), ReadMsg()
+        @see  Error(), LastError(), LastWriteCount(), SetFlags(), ReadMsg()

 
     */
     wxSocketBase& WriteMsg(const void* buffer, wxUint32 nbytes);
 
     */
     wxSocketBase& WriteMsg(const void* buffer, wxUint32 nbytes);


@@ -1259,6 +1397,25 @@ public:
     */
     void SetNotify(wxSocketEventFlags flags);
 
     */
     void SetNotify(wxSocketEventFlags flags);
 

+    /**
+        Returns the native socket descriptor.
+
+        This is intended to use with rarely used specific platform features
+        that can only be accessed via the actual socket descriptor.
+
+        Do not use this for reading or writing data from or to the socket as
+        this would almost surely interfere with wxSocket code logic and result
+        in unexpected behaviour.
+
+        The socket must be successfully initialized, e.g. connected for client
+        sockets, before this method can be called.
+
+        @return Returns the native socket descriptor.
+
+        @since 2.9.5
+    */
+    wxSOCKET_T GetSocket() const;
+

     //@}
 };
 
     //@}
 };
 


@@ -1294,7 +1451,7 @@ public:
     /**
         Write a buffer of @a nbytes bytes to the socket.
 
     /**
         Write a buffer of @a nbytes bytes to the socket.
 

-        Use wxSocketBase::LastCount() to verify the number of bytes actually wrote.
+        Use wxSocketBase::LastWriteCount() to verify the number of bytes actually wrote.

         Use wxSocketBase::Error() to determine if the operation succeeded.
 
         @param address
         Use wxSocketBase::Error() to determine if the operation succeeded.
 
         @param address