Stop using chrome-sandbox to determine real pids

content/common/child_process_sandbox_support_impl_linux.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 "content/common/child_process_sandbox_support_impl_linux.h"
 
 #include <sys/stat.h>
 
 #include "base/debug/trace_event.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 163 matching lines @@
     data_length = std::min(data_length, *output_length);
     ssize_t n = HANDLE_EINTR(pread(fd, output, data_length, data_offset));
     if (n != base::checked_cast<ssize_t>(data_length))
       return false;
   }
   *output_length = data_length;
 
   return true;
 }
 
+bool SendRealPidToZygote(int fd, base::ProcessId* out_pid) {
+  Pickle request;
+  request.WriteInt(LinuxSandbox::METHOD_GET_REAL_PID);
+  request.WriteBool(out_pid != NULL);
+
+  uint8_t buf[512];
+  const ssize_t n = UnixDomainSocket::SendRecvMsgWithFD(
+      GetSandboxFD(), buf, sizeof(buf), NULL, request, fd);
+  if (n < 0)
+    return false;
+
+  Pickle reply(reinterpret_cast<char*>(buf), n);
+  PickleIterator iter(reply);
+  int real_pid;
+  if (!iter.ReadInt(&real_pid))
+    return false;
+
+  if (out_pid)
+    *out_pid = real_pid;
+  else {
+    // If caller doesn't want to receive its real PID, then make sure the
+    // browser didn't send it to us.
+    CHECK_EQ(0, real_pid);
+  }
+
+  return true;
+}
+
 }  // namespace content