ipc/glue/Transport_posix.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: sw=2 ts=8 et :
   3  */
   4 /* This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   7
   8 #include <unistd.h>
   9
  10 #include <string>
  11
  12 #include "chrome/common/child_process_info.h"
  13
  14 #include "mozilla/ipc/Transport.h"
  15 #include "mozilla/ipc/FileDescriptor.h"
  16
  17 using namespace base;
  18 using namespace std;
  19
  20 namespace mozilla {
  21 namespace ipc {
  22
  23 bool
  24 CreateTransport(ProcessHandle /*unused*/, ProcessHandle /*unused*/,
  25                 TransportDescriptor* aOne, TransportDescriptor* aTwo)
  26 {
  27   // Gecko doesn't care about this random ID, and the argument to this
  28   // function isn't really necessary, it can be just any random
  29   // pointer value
  30   wstring id = ChildProcessInfo::GenerateRandomChannelID(aOne);
  31   // Use MODE_SERVER to force creation of the socketpair
  32   Transport t(id, Transport::MODE_SERVER, nullptr);
  33   int fd1 = t.GetFileDescriptor();
  34   int fd2, dontcare;
  35   t.GetClientFileDescriptorMapping(&fd2, &dontcare);
  36   if (fd1 < 0 || fd2 < 0) {
  37     return false;
  38   }
  39
  40   // The Transport closes these fds when it goes out of scope, so we
  41   // dup them here
  42   fd1 = dup(fd1);
  43   fd2 = dup(fd2);
  44   if (fd1 < 0 || fd2 < 0) {
  45     return false;
  46   }
  47
  48   aOne->mFd = base::FileDescriptor(fd1, true/*close after sending*/);
  49   aTwo->mFd = base::FileDescriptor(fd2, true/*close after sending*/);
  50   return true;
  51 }
  52
  53 Transport*
  54 OpenDescriptor(const TransportDescriptor& aTd, Transport::Mode aMode)
  55 {
  56   return new Transport(aTd.mFd.fd, aMode, nullptr);
  57 }
  58
  59 Transport*
  60 OpenDescriptor(const FileDescriptor& aFd, Transport::Mode aMode)
  61 {
  62   return new Transport(aFd.PlatformHandle(), aMode, nullptr);
  63 }
  64
  65 void
  66 CloseDescriptor(const TransportDescriptor& aTd)
  67 {
  68   close(aTd.mFd.fd);
  69 }
  70
  71 } // namespace ipc
  72 } // namespace mozilla