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//===- lib/Debugger/FDHandle.h - File Descriptor Handle ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a family of utility functions which are useful for doing
// various things with files.
//
//===----------------------------------------------------------------------===//
#ifndef LIB_DEBUGGER_FDHANDLE_H
#define LIB_DEBUGGER_FDHANDLE_H
#include "llvm/System/Path.h"
namespace llvm {
/// FDHandle - Simple handle class to make sure a file descriptor gets closed
/// when the object is destroyed. This handle acts similarly to an
/// std::auto_ptr, in that the copy constructor and assignment operators
/// transfer ownership of the handle. This means that FDHandle's do not have
/// value semantics.
///
class FDHandle {
int FD;
public:
FDHandle() : FD(-1) {}
FDHandle(int fd) : FD(fd) {}
FDHandle(FDHandle &RHS) : FD(RHS.FD) {
RHS.FD = -1; // Transfer ownership
}
~FDHandle() throw();
/// get - Get the current file descriptor, without releasing ownership of it.
int get() const { return FD; }
operator int() const { return FD; }
FDHandle &operator=(int fd) throw();
FDHandle &operator=(FDHandle &RHS) {
int fd = RHS.FD;
RHS.FD = -1; // Transfer ownership
return operator=(fd);
}
/// release - Take ownership of the file descriptor away from the FDHandle
/// object, so that the file is not closed when the FDHandle is destroyed.
int release() {
int Ret = FD;
FD = -1;
return Ret;
}
};
} // End llvm namespace
#endif
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