linux: use /proc/self/exe when exec'ing ourselves

chrome/test/chrome_process_util.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/test/chrome_process_util.h"
 
 #include <vector>
 #include <set>
 
 #include "base/process_util.h"
@@ skipping 82 matching lines @@
   // are children of one of the processes that we've already seen.
   {
     ChildProcessFilter filter(result);
     base::NamedProcessIterator it(chrome::kBrowserProcessExecutableName,
                                   &filter);
     while ((process_entry = it.NextProcessEntry()))
       result.push_back(process_entry->pid);
   }
 #endif  // defined(OS_LINUX)
 
-#if defined(OS_MACOSX)
-  // On Mac OS X we run the subprocesses with a different bundle, so they end
-  // up with a different name, so we have to collect them in a second pass.
+#if defined(OS_LINUX) || defined(OS_MACOSX)
+  // On Mac OS X we run the subprocesses with a different bundle, and
+  // on Linux via /proc/self/exe, so they end up with a different
+  // name.  We must collect them in a second pass.
   {
     ChildProcessFilter filter(browser_pid);
     base::NamedProcessIterator it(chrome::kHelperProcessExecutableName,
                                   &filter);
     while ((process_entry = it.NextProcessEntry()))
       result.push_back(process_entry->pid);
   }
 #endif  // defined(OS_MACOSX)
 
   result.push_back(browser_pid);
 
   return result;
 }
 
 #if !defined(OS_MACOSX)
 
 size_t ChromeTestProcessMetrics::GetPagefileUsage() {
   return process_metrics_->GetPagefileUsage();
 }
 
 size_t ChromeTestProcessMetrics::GetWorkingSetSize() {
   return process_metrics_->GetWorkingSetSize();
 }
 
 #endif  // !defined(OS_MACOSX)