Reid Spencer | 55cf0a6 | 2004-12-22 10:24:55 +0000 | [diff] [blame] | 1 | //===- lib/Debugger/FDHandle.h - File Descriptor Handle ---------*- C++ -*-===// |
Misha Brukman | edf128a | 2005-04-21 22:36:52 +0000 | [diff] [blame] | 2 | // |
Reid Spencer | 55cf0a6 | 2004-12-22 10:24:55 +0000 | [diff] [blame] | 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file was developed by the LLVM research group and is distributed under |
| 6 | // the University of Illinois Open Source License. See LICENSE.TXT for details. |
Misha Brukman | edf128a | 2005-04-21 22:36:52 +0000 | [diff] [blame] | 7 | // |
Reid Spencer | 55cf0a6 | 2004-12-22 10:24:55 +0000 | [diff] [blame] | 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file defines a family of utility functions which are useful for doing |
| 11 | // various things with files. |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | |
| 15 | #ifndef LIB_DEBUGGER_FDHANDLE_H |
| 16 | #define LIB_DEBUGGER_FDHANDLE_H |
| 17 | |
| 18 | #include "llvm/System/Path.h" |
| 19 | |
| 20 | namespace llvm { |
| 21 | |
| 22 | /// FDHandle - Simple handle class to make sure a file descriptor gets closed |
| 23 | /// when the object is destroyed. This handle acts similarly to an |
| 24 | /// std::auto_ptr, in that the copy constructor and assignment operators |
| 25 | /// transfer ownership of the handle. This means that FDHandle's do not have |
| 26 | /// value semantics. |
| 27 | /// |
| 28 | class FDHandle { |
| 29 | int FD; |
| 30 | public: |
| 31 | FDHandle() : FD(-1) {} |
| 32 | FDHandle(int fd) : FD(fd) {} |
| 33 | FDHandle(FDHandle &RHS) : FD(RHS.FD) { |
| 34 | RHS.FD = -1; // Transfer ownership |
| 35 | } |
| 36 | |
| 37 | ~FDHandle() throw(); |
| 38 | |
| 39 | /// get - Get the current file descriptor, without releasing ownership of it. |
| 40 | int get() const { return FD; } |
| 41 | operator int() const { return FD; } |
| 42 | |
| 43 | FDHandle &operator=(int fd) throw(); |
| 44 | |
| 45 | FDHandle &operator=(FDHandle &RHS) { |
| 46 | int fd = RHS.FD; |
| 47 | RHS.FD = -1; // Transfer ownership |
| 48 | return operator=(fd); |
| 49 | } |
| 50 | |
| 51 | /// release - Take ownership of the file descriptor away from the FDHandle |
| 52 | /// object, so that the file is not closed when the FDHandle is destroyed. |
| 53 | int release() { |
| 54 | int Ret = FD; |
| 55 | FD = -1; |
| 56 | return Ret; |
| 57 | } |
| 58 | }; |
| 59 | |
| 60 | } // End llvm namespace |
| 61 | |
| 62 | #endif |