1 //------------------------------------------------------------------------------ 2 // Copyright (c) 2001-2002, OpenBeOS 3 // 4 // Permission is hereby granted, free of charge, to any person obtaining a 5 // copy of this software and associated documentation files (the "Software"), 6 // to deal in the Software without restriction, including without limitation 7 // the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 // and/or sell copies of the Software, and to permit persons to whom the 9 // Software is furnished to do so, subject to the following conditions: 10 // 11 // The above copyright notice and this permission notice shall be included in 12 // all copies or substantial portions of the Software. 13 // 14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 19 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 20 // DEALINGS IN THE SOFTWARE. 21 // 22 // File Name: PortLink.h 23 // Author: DarkWyrm <bpmagic@columbus.rr.com> 24 // Pahtz <pahtz@yahoo.com.au> 25 // Description: Class for low-overhead port-based messaging 26 // 27 //------------------------------------------------------------------------------ 28 #ifndef _PORTLINK_H 29 #define _PORTLINK_H 30 31 #include <OS.h> 32 #include <LinkMsgReader.h> 33 #include <LinkMsgSender.h> 34 35 /* 36 Error checking rules: (for if you don't want to check every return code) 37 38 Calling EndMessage() is optional, implied by Flush() or StartMessage(). 39 40 If you are sending just one message you only need to test Flush() == B_OK 41 42 If you are buffering multiple messages without calling Flush() you must 43 check EndMessage() == B_OK, or the last Attach() for each message. Check 44 Flush() at the end. 45 46 If you are reading, check the last Read() or ReadString() you perform. 47 48 */ 49 50 class BPortLink 51 { 52 public: 53 BPortLink(port_id send = -1, port_id reply = -1); 54 virtual ~BPortLink(); 55 56 status_t StartMessage(int32 code); 57 void CancelMessage(); 58 status_t EndMessage(); 59 60 status_t Flush(bigtime_t timeout = B_INFINITE_TIMEOUT); 61 62 void SetSendPort(port_id port); 63 port_id GetSendPort(); 64 65 void SetReplyPort(port_id port); 66 port_id GetReplyPort(); 67 68 status_t Attach(const void *data, ssize_t size); 69 status_t AttachString(const char *string); 70 template <class Type> status_t Attach(const Type& data) 71 { 72 return Attach(&data, sizeof(Type)); 73 } 74 75 status_t GetNextReply(int32 *code, bigtime_t timeout = B_INFINITE_TIMEOUT); 76 status_t Read(void *data, ssize_t size); 77 status_t ReadString(char **string); 78 template <class T> status_t Read(T *data) 79 { 80 return fReader->Read(data,sizeof(T)); 81 } 82 83 protected: 84 LinkMsgReader *fReader; 85 LinkMsgSender *fSender; 86 }; 87 88 #endif 89