Revert 149692 - Create a LinuxSandbox class.

content/zygote/zygote_linux.h

 // 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.
 
 #ifndef CONTENT_ZYGOTE_ZYGOTE_H_
 #define CONTENT_ZYGOTE_ZYGOTE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/hash_tables.h"
 #include "base/process.h"
+#include "content/common/seccomp_sandbox.h"
 
 class Pickle;
 class PickleIterator;
 
 namespace content {
 
 class ZygoteForkDelegate;
 
 // This is the object which implements the zygote. The ZygoteMain function,
 // which is called from ChromeMain, simply constructs one of these objects and
 // runs it.
 class Zygote {
  public:
+  // The proc_fd_for_seccomp should be a file descriptor to /proc under the
+  // seccomp sandbox. This is not needed when not using seccomp, and should be
+  // -1 in those cases.
   Zygote(int sandbox_flags,
-         ZygoteForkDelegate* helper);
+         ZygoteForkDelegate* helper,
+         int proc_fd_for_seccomp);
   ~Zygote();
 
   bool ProcessRequests();
 
   static const int kBrowserDescriptor = 3;
   static const int kMagicSandboxIPCDescriptor = 5;
 
  private:
   // Returns true if the SUID sandbox is active.
   bool UsingSUIDSandbox() const;
@@ skipping 48 matching lines @@
 
   // In the SUID sandbox, we try to use a new PID namespace. Thus the PIDs
   // fork() returns are not the real PIDs, so we need to map the Real PIDS
   // into the sandbox PID namespace.
   typedef base::hash_map<base::ProcessHandle, base::ProcessHandle> ProcessMap;
   ProcessMap real_pids_to_sandbox_pids;
 
   const int sandbox_flags_;
   ZygoteForkDelegate* helper_;
 
+#if defined(SECCOMP_SANDBOX)
+  // File descriptor to proc under seccomp, -1 when not using seccomp.
+  int proc_fd_for_seccomp_;
+#endif
+
   // These might be set by helper_->InitialUMA. They supply a UMA enumeration
   // sample we should report on the first fork.
   std::string initial_uma_name_;
   int initial_uma_sample_;
   int initial_uma_boundary_value_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_ZYGOTE_ZYGOTE_H_