aos/scoped/scoped_fd.h

#ifndef AOS_SCOPED_SCOPED_FD_H_
#define AOS_SCOPED_SCOPED_FD_H_

#include <unistd.h>

#include "aos/macros.h"

namespace aos {

// Smart "pointer" (container) for a file descriptor.
class ScopedFD {
 public:
  explicit ScopedFD(int fd = -1) : fd_(fd) {}
  ~ScopedFD() { Close(); }
  int get() const { return fd_; }
  int release() {
    const int r = fd_;
    fd_ = -1;
    return r;
  }
  void reset(int new_fd = -1) {
    if (fd_ != new_fd) {
      Close();
      fd_ = new_fd;
    }
  }
  operator bool() const { return fd_ != -1; }

 private:
  int fd_;
  void Close();
  DISALLOW_COPY_AND_ASSIGN(ScopedFD);
};

}  // namespace aos

#endif  // AOS_SCOPED_SCOPED_FD_H_