Implement ScopedFD in terms of ScopedGeneric.

content/common/sandbox_linux/sandbox_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 <dirent.h>
 #include <fcntl.h>
 #include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include <limits>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
+#include "base/files/scoped_file.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "content/common/sandbox_linux/sandbox_linux.h"
 #include "content/common/sandbox_linux/sandbox_seccomp_bpf_linux.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/sandbox_linux.h"
 #include "sandbox/linux/services/credentials.h"
 #include "sandbox/linux/services/thread_helpers.h"
 #include "sandbox/linux/services/yama.h"
 #include "sandbox/linux/suid/client/setuid_sandbox_client.h"
 
 using sandbox::Yama;
 
 namespace {
 
 struct FDCloser {
   inline void operator()(int* fd) const {
     DCHECK(fd);
     PCHECK(0 == IGNORE_EINTR(close(*fd)));
     *fd = -1;
   }
 };
 
-// Don't use base::ScopedFD since it doesn't CHECK that the file descriptor was
-// closed.
-typedef scoped_ptr<int, FDCloser> SafeScopedFD;
-
 void LogSandboxStarted(const std::string& sandbox_name) {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   const std::string process_type =
       command_line.GetSwitchValueASCII(switches::kProcessType);
   const std::string activated_sandbox =
       "Activated " + sandbox_name + " sandbox for process type: " +
       process_type + ".";
 #if defined(OS_CHROMEOS)
   LOG(WARNING) << activated_sandbox;
 #else
@@ skipping 136 matching lines @@
   }
 
   return sandbox_status_flags_;
 }
 
 // Threads are counted via /proc/self/task. This is a little hairy because of
 // PID namespaces and existing sandboxes, so "self" must really be used instead
 // of using the pid.
 bool LinuxSandbox::IsSingleThreaded() const {
   bool is_single_threaded = false;
-  int proc_self_task = OpenProcTaskFd(proc_fd_);
+  base::ScopedFD proc_self_task(OpenProcTaskFd(proc_fd_));
 
 // In Debug mode, it's mandatory to be able to count threads to catch bugs.
 #if !defined(NDEBUG)
   // Using CHECK here since we want to check all the cases where
   // !defined(NDEBUG)
   // gets built.
-  CHECK_LE(0, proc_self_task) << "Could not count threads, the sandbox was not "
-                              << "pre-initialized properly.";
+  CHECK(proc_self_task) << "Could not count threads, the sandbox was not "
+                        << "pre-initialized properly.";
 #endif  // !defined(NDEBUG)
 
-  if (proc_self_task < 0) {
+  if (!proc_self_task) {
     // Pretend to be monothreaded if it can't be determined (for instance the
     // setuid sandbox is already engaged but no proc_fd_ is available).
     is_single_threaded = true;
   } else {
-    SafeScopedFD task_closer(&proc_self_task);
     is_single_threaded =
-        sandbox::ThreadHelpers::IsSingleThreaded(proc_self_task);
+        sandbox::ThreadHelpers::IsSingleThreaded(proc_self_task.get());
   }
 
   return is_single_threaded;
 }
 
 bool LinuxSandbox::seccomp_bpf_started() const {
   return seccomp_bpf_started_;
 }
 
 sandbox::SetuidSandboxClient*
@@ skipping 137 matching lines @@
         (sandbox_status_flags_ != kSandboxLinuxInvalid) &&
         (GetStatus() & kSandboxLinuxSeccompBPF);
   }
   if (promised_seccomp_bpf_would_start) {
     CHECK(seccomp_bpf_started_);
   }
 }
 
 void LinuxSandbox::StopThreadAndEnsureNotCounted(base::Thread* thread) const {
   DCHECK(thread);
-  int proc_self_task = OpenProcTaskFd(proc_fd_);
-  PCHECK(proc_self_task >= 0);
-  SafeScopedFD task_closer(&proc_self_task);
-  CHECK(
-      sandbox::ThreadHelpers::StopThreadAndWatchProcFS(proc_self_task, thread));
+  base::ScopedFD proc_self_task(OpenProcTaskFd(proc_fd_));
+  PCHECK(proc_self_task);
+  CHECK(sandbox::ThreadHelpers::StopThreadAndWatchProcFS(proc_self_task.get(),
+                                                         thread));
 }
 
 }  // namespace content