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      1 // Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef BASE_FILE_DESCRIPTOR_POSIX_H_
      6 #define BASE_FILE_DESCRIPTOR_POSIX_H_
      7 
      8 namespace base {
      9 
     10 // -----------------------------------------------------------------------------
     11 // We introduct a special structure for file descriptors in order that we are
     12 // able to use template specialisation to special-case their handling.
     13 //
     14 // WARNING: (Chromium only) There are subtleties to consider if serialising
     15 // these objects over IPC. See comments in ipc/ipc_message_utils.h
     16 // above the template specialisation for this structure.
     17 // -----------------------------------------------------------------------------
     18 struct FileDescriptor {
     19   FileDescriptor()
     20       : fd(-1),
     21         auto_close(false) { }
     22 
     23   FileDescriptor(int ifd, bool iauto_close)
     24       : fd(ifd),
     25         auto_close(iauto_close) { }
     26 
     27   bool operator==(const FileDescriptor& other) const {
     28     return (fd == other.fd && auto_close == other.auto_close);
     29   }
     30 
     31   // A comparison operator so that we can use these as keys in a std::map.
     32   bool operator<(const FileDescriptor& other) const {
     33     return other.fd < fd;
     34   }
     35 
     36   int fd;
     37   // If true, this file descriptor should be closed after it has been used. For
     38   // example an IPC system might interpret this flag as indicating that the
     39   // file descriptor it has been given should be closed after use.
     40   bool auto_close;
     41 };
     42 
     43 }  // namespace base
     44 
     45 #endif  // BASE_FILE_DESCRIPTOR_POSIX_H_
     46