Move the Linux zygote stuff into its own per-process directory.

content/browser/zygote_host_impl_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 "content/browser/zygote_host_impl_linux.h"
 
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/eintr_wrapper.h"
 #include "base/environment.h"
 #include "base/file_util.h"
 #include "base/linux_util.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
 #include "base/pickle.h"
 #include "base/process_util.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "content/browser/renderer_host/render_sandbox_host_linux.h"
 #include "content/common/unix_domain_socket_posix.h"
+#include "content/common/zygote_commands_linux.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/result_codes.h"
 #include "sandbox/linux/suid/sandbox.h"
 #include "sandbox/linux/suid/suid_unsafe_environment_variables.h"
 
 #if defined(USE_TCMALLOC)
 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
 #endif
 
@@ skipping 134 matching lines @@
   options.fds_to_remap = &fds_to_map;
   base::LaunchProcess(cmd_line.argv(), options, &process);
   CHECK(process != -1) << "Failed to launch zygote process";
 
   if (using_suid_sandbox_) {
     // In the SUID sandbox, the real zygote is forked from the sandbox.
     // We need to look for it.
     // But first, wait for the zygote to tell us it's running.
     // The sending code is in content/browser/zygote_main_linux.cc.
     std::vector<int> fds_vec;
-    const int kExpectedLength = sizeof(kZygoteMagic);
+    const int kExpectedLength = sizeof(content::kZygoteHelloMessage);
     char buf[kExpectedLength];
     const ssize_t len = UnixDomainSocket::RecvMsg(fds[0], buf, sizeof(buf),
                                                   &fds_vec);
     CHECK(len == kExpectedLength) << "Incorrect zygote magic length";
-    CHECK(0 == strcmp(buf, kZygoteMagic)) << "Incorrect zygote magic";
+    CHECK(0 == strcmp(buf, content::kZygoteHelloMessage))
+        << "Incorrect zygote hello";
 
     std::string inode_output;
     ino_t inode = 0;
     // Figure out the inode for |dummy_fd|, close |dummy_fd| on our end,
     // and find the zygote process holding |dummy_fd|.
     if (base::FileDescriptorGetInode(&inode, dummy_fd)) {
       close(dummy_fd);
       std::vector<std::string> get_inode_cmdline;
       get_inode_cmdline.push_back(sandbox_binary_);
       get_inode_cmdline.push_back(base::kFindInodeSwitch);
@@ skipping 12 matching lines @@
     }
   } else {
     // Not using the SUID sandbox.
     pid_ = process;
   }
 
   close(fds[1]);
   control_fd_ = fds[0];
 
   Pickle pickle;
-  pickle.WriteInt(kCmdGetSandboxStatus);
+  pickle.WriteInt(content::kZygoteCommandGetSandboxStatus);
   std::vector<int> empty_fds;
   if (!UnixDomainSocket::SendMsg(control_fd_, pickle.data(), pickle.size(),
                                  empty_fds))
     LOG(FATAL) << "Cannot communicate with zygote";
   // We don't wait for the reply. We'll read it in ReadReply.
 }
 
 ssize_t ZygoteHostImpl::ReadReply(void* buf, size_t buf_len) {
-  // At startup we send a kCmdGetSandboxStatus request to the zygote, but don't
-  // wait for the reply. Thus, the first time that we read from the zygote, we
-  // get the reply to that request.
+  // At startup we send a kZygoteCommandGetSandboxStatus request to the zygote,
+  // but don't wait for the reply. Thus, the first time that we read from the
+  // zygote, we get the reply to that request.
   if (!have_read_sandbox_status_word_) {
     if (HANDLE_EINTR(read(control_fd_, &sandbox_status_,
                           sizeof(sandbox_status_))) !=
         sizeof(sandbox_status_)) {
       return -1;
     }
     have_read_sandbox_status_word_ = true;
   }
 
   return HANDLE_EINTR(read(control_fd_, buf, buf_len));
 }
 
 pid_t ZygoteHostImpl::ForkRequest(
     const std::vector<std::string>& argv,
     const base::GlobalDescriptors::Mapping& mapping,
     const std::string& process_type) {
   DCHECK(init_);
   Pickle pickle;
 
-  pickle.WriteInt(kCmdFork);
+  pickle.WriteInt(content::kZygoteCommandFork);
   pickle.WriteString(process_type);
   pickle.WriteInt(argv.size());
   for (std::vector<std::string>::const_iterator
        i = argv.begin(); i != argv.end(); ++i)
     pickle.WriteString(*i);
 
   pickle.WriteInt(mapping.size());
 
   std::vector<int> fds;
   for (base::GlobalDescriptors::Mapping::const_iterator
@@ skipping 158 matching lines @@
   // Low memory notification is currently only implemented on ChromeOS.
   NOTREACHED() << "AdjustLowMemoryMargin not implemented";
 #endif  // defined(OS_CHROMEOS)
 }
 
 
 void ZygoteHostImpl::EnsureProcessTerminated(pid_t process) {
   DCHECK(init_);
   Pickle pickle;
 
-  pickle.WriteInt(kCmdReap);
+  pickle.WriteInt(content::kZygoteCommandReap);
   pickle.WriteInt(process);
 
   if (HANDLE_EINTR(write(control_fd_, pickle.data(), pickle.size())) < 0)
     PLOG(ERROR) << "write";
 }
 
 base::TerminationStatus ZygoteHostImpl::GetTerminationStatus(
     base::ProcessHandle handle,
     int* exit_code) {
   DCHECK(init_);
   Pickle pickle;
-  pickle.WriteInt(kCmdGetTerminationStatus);
+  pickle.WriteInt(content::kZygoteCommandGetTerminationStatus);
   pickle.WriteInt(handle);
 
   // Set this now to handle the early termination cases.
   if (exit_code)
     *exit_code = content::RESULT_CODE_NORMAL_EXIT;
 
   static const unsigned kMaxMessageLength = 128;
   char buf[kMaxMessageLength];
   ssize_t len;
   {
@@ skipping 33 matching lines @@
 
 pid_t ZygoteHostImpl::GetSandboxHelperPid() const {
   return RenderSandboxHostLinux::GetInstance()->pid();
 }
 
 int ZygoteHostImpl::GetSandboxStatus() const {
   if (have_read_sandbox_status_word_)
     return sandbox_status_;
   return 0;
 }