Non-SFI mode: Use dummy PID for NaCl's IPC channel for nacl_helper_nonsfi.

ipc/ipc_channel_posix.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ipc/ipc_channel_posix.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <sys/socket.h>
@@ skipping 755 matching lines @@
     Close();
     if (AcceptsConnections()) {
       listener()->OnChannelListenError();
     } else {
       listener()->OnChannelError();
     }
   }
 }
 
 int ChannelPosix::GetHelloMessageProcId() const {
+#if defined(OS_NACL_NONSFI)
+  // In nacl_helper_nonsfi, getpid() invoked by GetCurrentProcId() is not
+  // allowed and would cause a SIGSYS crash because of the seccomp sandbox.
+  return -1;
+#else
   int pid = base::GetCurrentProcId();
 #if defined(OS_LINUX)
   // Our process may be in a sandbox with a separate PID namespace.
   if (global_pid_) {
     pid = global_pid_;
   }
-#endif
+#endif  // defined(OS_LINUX)
   return pid;
+#endif  // defined(OS_NACL_NONSFI)
 }
 
 void ChannelPosix::QueueHelloMessage() {
   // Create the Hello message
   scoped_ptr<Message> msg(new Message(MSG_ROUTING_NONE,
                                       HELLO_MESSAGE_TYPE,
                                       IPC::Message::PRIORITY_NORMAL));
   if (!msg->WriteInt(GetHelloMessageProcId())) {
     NOTREACHED() << "Unable to pickle hello message proc id";
   }
@@ skipping 335 matching lines @@
 }
 
 #if defined(OS_LINUX)
 // static
 void Channel::SetGlobalPid(int pid) {
   ChannelPosix::SetGlobalPid(pid);
 }
 #endif  // OS_LINUX
 
 }  // namespace IPC