C++11 declares a type safe null pointer

content/common/sandbox_linux/bpf_gpu_policy_linux.cc

 // Copyright (c) 2013 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/sandbox_linux/bpf_gpu_policy_linux.h"
 
 #include <dlfcn.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/socket.h>
@@ skipping 130 matching lines @@
       return Allow();
     default:
       return GpuProcessPolicy::EvaluateSyscall(sysno);
   }
 }
 
 void UpdateProcessTypeToGpuBroker() {
   base::CommandLine::StringVector exec =
       base::CommandLine::ForCurrentProcess()->GetArgs();
   base::CommandLine::Reset();
-  base::CommandLine::Init(0, NULL);
+  base::CommandLine::Init(0, nullptr);
   base::CommandLine::ForCurrentProcess()->InitFromArgv(exec);
   base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(
       switches::kProcessType, "gpu-broker");
 
   // Update the process title. The argv was already cached by the call to
   // SetProcessTitleFromCommandLine in content_main_runner.cc, so we can pass
-  // NULL here (we don't have the original argv at this point).
-  SetProcessTitleFromCommandLine(NULL);
+  // nullptr here (we don't have the original argv at this point).
+  SetProcessTitleFromCommandLine(nullptr);
 }
 
 bool UpdateProcessTypeAndEnableSandbox(sandbox::bpf_dsl::SandboxBPFDSLPolicy* (
     *broker_sandboxer_allocator)(void)) {
   DCHECK(broker_sandboxer_allocator);
   UpdateProcessTypeToGpuBroker();
   return SandboxSeccompBPF::StartSandboxWithExternalPolicy(
       make_scoped_ptr(broker_sandboxer_allocator()));
 }
 
 }  // namespace
 
-GpuProcessPolicy::GpuProcessPolicy() : broker_process_(NULL) {}
+GpuProcessPolicy::GpuProcessPolicy() : broker_process_(nullptr) {}
 
 GpuProcessPolicy::~GpuProcessPolicy() {}
 
 // Main policy for x86_64/i386. Extended by CrosArmGpuProcessPolicy.
 ResultExpr GpuProcessPolicy::EvaluateSyscall(int sysno) const {
   switch (sysno) {
     case __NR_ioctl:
 #if defined(__i386__) || defined(__x86_64__) || defined(__mips__)
     // The Nvidia driver uses flags not in the baseline policy
     // (MAP_LOCKED | MAP_EXECUTABLE | MAP_32BIT)
@@ skipping 35 matching lines @@
   // Create a new broker process.
   InitGpuBrokerProcess(
       GpuBrokerProcessPolicy::Create,
       std::vector<std::string>(),  // No extra files in whitelist.
       std::vector<std::string>());
 
   if (IsArchitectureX86_64() || IsArchitectureI386()) {
     // Accelerated video dlopen()'s some shared objects
     // inside the sandbox, so preload them now.
     if (IsAcceleratedVideoEnabled()) {
-      const char* I965DrvVideoPath = NULL;
+      const char* I965DrvVideoPath = nullptr;
 
       if (IsArchitectureX86_64()) {
         I965DrvVideoPath = "/usr/lib64/va/drivers/i965_drv_video.so";
       } else if (IsArchitectureI386()) {
         I965DrvVideoPath = "/usr/lib/va/drivers/i965_drv_video.so";
       }
 
       dlopen(I965DrvVideoPath, RTLD_NOW|RTLD_GLOBAL|RTLD_NODELETE);
       dlopen("libva.so.1", RTLD_NOW|RTLD_GLOBAL|RTLD_NODELETE);
       dlopen("libva-x11.so.1", RTLD_NOW|RTLD_GLOBAL|RTLD_NODELETE);
     }
   }
 
   return true;
 }
 
 void GpuProcessPolicy::InitGpuBrokerProcess(
     sandbox::bpf_dsl::SandboxBPFDSLPolicy* (*broker_sandboxer_allocator)(void),
     const std::vector<std::string>& read_whitelist_extra,
     const std::vector<std::string>& write_whitelist_extra) {
   static const char kDriRcPath[] = "/etc/drirc";
   static const char kDriCard0Path[] = "/dev/dri/card0";
 
-  CHECK(broker_process_ == NULL);
+  CHECK(broker_process_ == nullptr);
 
   // All GPU process policies need these files brokered out.
   std::vector<std::string> read_whitelist;
   read_whitelist.push_back(kDriCard0Path);
   read_whitelist.push_back(kDriRcPath);
   // Add eventual extra files from read_whitelist_extra.
   read_whitelist.insert(read_whitelist.end(),
                         read_whitelist_extra.begin(),
                         read_whitelist_extra.end());
 
   std::vector<std::string> write_whitelist;
   write_whitelist.push_back(kDriCard0Path);
   // Add eventual extra files from write_whitelist_extra.
   write_whitelist.insert(write_whitelist.end(),
                          write_whitelist_extra.begin(),
                          write_whitelist_extra.end());
 
   broker_process_ = new BrokerProcess(GetFSDeniedErrno(),
                                       read_whitelist,
                                       write_whitelist);
   // The initialization callback will perform generic initialization and then
   // call broker_sandboxer_callback.
   CHECK(broker_process_->Init(base::Bind(&UpdateProcessTypeAndEnableSandbox,
                                          broker_sandboxer_allocator)));
 }
 
 }  // namespace content