Launch processes asynchronously so as not to block the UI thread. For now, re...

chrome/browser/zygote_host_linux.cc

 // Copyright (c) 2009 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 "chrome/browser/zygote_host_linux.h"
 
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
@@ skipping 182 matching lines @@
   pickle.WriteInt(mapping.size());
 
   std::vector<int> fds;
   for (base::GlobalDescriptors::Mapping::const_iterator
        i = mapping.begin(); i != mapping.end(); ++i) {
     pickle.WriteUInt32(i->first);
     fds.push_back(i->second);
   }
 
   if (!base::SendMsg(control_fd_, pickle.data(), pickle.size(), fds))
-    return -1;
+    return base::kNullProcessHandle;
 
   pid_t pid;
   if (HANDLE_EINTR(read(control_fd_, &pid, sizeof(pid))) != sizeof(pid))
-    return -1;
+    return base::kNullProcessHandle;
 
   return pid;
 }
 
 void ZygoteHost::EnsureProcessTerminated(pid_t process) {
   DCHECK(init_);
   Pickle pickle;
 
   pickle.WriteInt(kCmdReap);
   pickle.WriteInt(process);
@@ skipping 29 matching lines @@
       !read_pickle.ReadBool(&iter, &tmp_child_exited)) {
     LOG(WARNING) << "Error parsing DidProcessCrash response from zygote.";
     return false;
   }
 
   if (child_exited)
     *child_exited = tmp_child_exited;
 
   return did_crash;
 }