Move chrome/nacl to components/nacl.

chrome/app/nacl_fork_delegate_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 "chrome/app/nacl_fork_delegate_linux.h"
-
-#include <signal.h>
-#include <stdlib.h>
-#include <sys/resource.h>
-#include <sys/socket.h>
-
-#include <set>
-
-#include "base/basictypes.h"
-#include "base/command_line.h"
-#include "base/files/file_path.h"
-#include "base/logging.h"
-#include "base/path_service.h"
-#include "base/posix/eintr_wrapper.h"
-#include "base/posix/unix_domain_socket_linux.h"
-#include "base/process_util.h"
-#include "base/third_party/dynamic_annotations/dynamic_annotations.h"
-#include "chrome/common/chrome_paths.h"
-#include "chrome/common/chrome_switches.h"
-#include "chrome/common/nacl_helper_linux.h"
-
-NaClForkDelegate::NaClForkDelegate()
-    : status_(kNaClHelperUnused),
-      fd_(-1) {}
-
-// Note these need to match up with their counterparts in nacl_helper_linux.c
-// and nacl_helper_bootstrap_linux.c.
-const char kNaClHelperReservedAtZero[] =
-    "--reserved_at_zero=0xXXXXXXXXXXXXXXXX";
-const char kNaClHelperRDebug[] = "--r_debug=0xXXXXXXXXXXXXXXXX";
-
-void NaClForkDelegate::Init(const int sandboxdesc) {
-  VLOG(1) << "NaClForkDelegate::Init()";
-  int fds[2];
-
-  // Confirm a hard-wired assumption.
-  // The NaCl constant is from chrome/nacl/nacl_linux_helper.h
-  DCHECK(kNaClSandboxDescriptor == sandboxdesc);
-
-  CHECK(socketpair(PF_UNIX, SOCK_SEQPACKET, 0, fds) == 0);
-  base::FileHandleMappingVector fds_to_map;
-  fds_to_map.push_back(std::make_pair(fds[1], kNaClZygoteDescriptor));
-  fds_to_map.push_back(std::make_pair(sandboxdesc, kNaClSandboxDescriptor));
-
-  status_ = kNaClHelperUnused;
-  base::FilePath helper_exe;
-  base::FilePath helper_bootstrap_exe;
-  if (!PathService::Get(chrome::FILE_NACL_HELPER, &helper_exe)) {
-    status_ = kNaClHelperMissing;
-  } else if (!PathService::Get(chrome::FILE_NACL_HELPER_BOOTSTRAP,
-                               &helper_bootstrap_exe)) {
-    status_ = kNaClHelperBootstrapMissing;
-  } else if (RunningOnValgrind()) {
-    status_ = kNaClHelperValgrind;
-  } else {
-    CommandLine cmd_line(helper_bootstrap_exe);
-    cmd_line.AppendArgPath(helper_exe);
-    cmd_line.AppendArgNative(kNaClHelperReservedAtZero);
-    cmd_line.AppendArgNative(kNaClHelperRDebug);
-    base::LaunchOptions options;
-    options.fds_to_remap = &fds_to_map;
-    options.clone_flags = CLONE_FS | SIGCHLD;
-
-    // The NaCl processes spawned may need to exceed the ambient soft limit
-    // on RLIMIT_AS to allocate the untrusted address space and its guard
-    // regions.  The nacl_helper itself cannot just raise its own limit,
-    // because the existing limit may prevent the initial exec of
-    // nacl_helper_bootstrap from succeeding, with its large address space
-    // reservation.
-    std::set<int> max_these_limits;
-    max_these_limits.insert(RLIMIT_AS);
-    options.maximize_rlimits = &max_these_limits;
-
-    if (!base::LaunchProcess(cmd_line.argv(), options, NULL))
-      status_ = kNaClHelperLaunchFailed;
-    // parent and error cases are handled below
-  }
-  if (HANDLE_EINTR(close(fds[1])) != 0)
-    LOG(ERROR) << "close(fds[1]) failed";
-  if (status_ == kNaClHelperUnused) {
-    const ssize_t kExpectedLength = strlen(kNaClHelperStartupAck);
-    char buf[kExpectedLength];
-
-    // Wait for ack from nacl_helper, indicating it is ready to help
-    const ssize_t nread = HANDLE_EINTR(read(fds[0], buf, sizeof(buf)));
-    if (nread == kExpectedLength &&
-        memcmp(buf, kNaClHelperStartupAck, nread) == 0) {
-      // all is well
-      status_ = kNaClHelperSuccess;
-      fd_ = fds[0];
-      return;
-    }
-
-    status_ = kNaClHelperAckFailed;
-    LOG(ERROR) << "Bad NaCl helper startup ack (" << nread << " bytes)";
-  }
-  // TODO(bradchen): Make this LOG(ERROR) when the NaCl helper
-  // becomes the default.
-  fd_ = -1;
-  if (HANDLE_EINTR(close(fds[0])) != 0)
-    LOG(ERROR) << "close(fds[0]) failed";
-}
-
-void NaClForkDelegate::InitialUMA(std::string* uma_name,
-                                  int* uma_sample,
-                                  int* uma_boundary_value) {
-  *uma_name = "NaCl.Client.Helper.InitState";
-  *uma_sample = status_;
-  *uma_boundary_value = kNaClHelperStatusBoundary;
-}
-
-NaClForkDelegate::~NaClForkDelegate() {
-  // side effect of close: delegate process will terminate
-  if (status_ == kNaClHelperSuccess) {
-    if (HANDLE_EINTR(close(fd_)) != 0)
-      LOG(ERROR) << "close(fd_) failed";
-  }
-}
-
-bool NaClForkDelegate::CanHelp(const std::string& process_type,
-                               std::string* uma_name,
-                               int* uma_sample,
-                               int* uma_boundary_value) {
-  if (process_type != switches::kNaClLoaderProcess)
-    return false;
-  *uma_name = "NaCl.Client.Helper.StateOnFork";
-  *uma_sample = status_;
-  *uma_boundary_value = kNaClHelperStatusBoundary;
-  return status_ == kNaClHelperSuccess;
-}
-
-pid_t NaClForkDelegate::Fork(const std::vector<int>& fds) {
-  base::ProcessId naclchild;
-  VLOG(1) << "NaClForkDelegate::Fork";
-
-  DCHECK(fds.size() == kNaClParentFDIndex + 1);
-  if (!UnixDomainSocket::SendMsg(fd_, kNaClForkRequest,
-                                 strlen(kNaClForkRequest), fds)) {
-    LOG(ERROR) << "NaClForkDelegate::Fork: SendMsg failed";
-    return -1;
-  }
-  int nread = HANDLE_EINTR(read(fd_, &naclchild, sizeof(naclchild)));
-  if (nread != sizeof(naclchild)) {
-    LOG(ERROR) << "NaClForkDelegate::Fork: read failed";
-    return -1;
-  }
-  VLOG(1) << "nacl_child is " << naclchild << " (" << nread << " bytes)";
-  return naclchild;
-}
-
-bool NaClForkDelegate::AckChild(const int fd,
-                                const std::string& channel_switch) {
-  int nwritten = HANDLE_EINTR(write(fd, channel_switch.c_str(),
-                                    channel_switch.length()));
-  if (nwritten != static_cast<int>(channel_switch.length())) {
-    return false;
-  }
-  return true;
-}