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// Copyright (c) 2009 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/nacl/nacl_thread.h"
#include <vector>
#include "base/atomicops.h"
#include "base/scoped_ptr.h"
#include "chrome/common/nacl_messages.h"
#include "native_client/src/shared/imc/nacl_imc.h"
#if defined(OS_LINUX)
#include "chrome/renderer/renderer_sandbox_support_linux.h"
#endif
#if defined(OS_MACOSX)
namespace {
// On Mac OS X, shm_open() works in the sandbox but does not give us
// an FD that we can map as PROT_EXEC. Rather than doing an IPC to
// get an executable SHM region when CreateMemoryObject() is called,
// we preallocate one on startup, since NaCl's sel_ldr only needs one
// of them. This saves a round trip.
base::subtle::Atomic32 g_shm_fd = -1;
int CreateMemoryObject(size_t size, bool executable) {
if (executable && size > 0) {
int result_fd = base::subtle::NoBarrier_AtomicExchange(&g_shm_fd, -1);
if (result_fd != -1) {
// ftruncate() is disallowed by the Mac OS X sandbox and
// returns EPERM. Luckily, we can get the same effect with
// lseek() + write().
if (lseek(result_fd, size - 1, SEEK_SET) == -1) {
LOG(ERROR) << "lseek() failed: " << errno;
return -1;
}
if (write(result_fd, "", 1) != 1) {
LOG(ERROR) << "write() failed: " << errno;
return -1;
}
return result_fd;
}
}
// Fall back to NaCl's default implementation.
return -1;
}
} // namespace
#endif // defined(OS_MACOSX)
// This is ugly. We need an interface header file for the exported
// sel_ldr interfaces.
// TODO(gregoryd,sehr): Add an interface header.
#if defined(OS_WIN)
typedef HANDLE NaClHandle;
#else
typedef int NaClHandle;
#endif // NaClHandle
// This is currently necessary because we have a conflict between
// NaCl's "struct NaClThread" and Chromium's "class NaClThread".
extern "C" int NaClMainForChromium(int handle_count, const NaClHandle* handles,
int debug);
NaClThread::NaClThread(bool debug) {
debug_enabled_ = debug ? 1 : 0;
}
NaClThread::~NaClThread() {
}
NaClThread* NaClThread::current() {
return static_cast<NaClThread*>(ChildThread::current());
}
bool NaClThread::OnControlMessageReceived(const IPC::Message& msg) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(NaClThread, msg)
IPC_MESSAGE_HANDLER(NaClProcessMsg_Start, OnStartSelLdr)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
void NaClThread::OnStartSelLdr(std::vector<nacl::FileDescriptor> handles) {
#if defined(OS_LINUX)
nacl::SetCreateMemoryObjectFunc(
renderer_sandbox_support::MakeSharedMemorySegmentViaIPC);
#elif defined(OS_MACOSX)
nacl::SetCreateMemoryObjectFunc(CreateMemoryObject);
CHECK(handles.size() >= 1);
g_shm_fd = nacl::ToNativeHandle(handles[handles.size() - 1]);
handles.pop_back();
#endif
scoped_array<NaClHandle> array(new NaClHandle[handles.size()]);
for (size_t i = 0; i < handles.size(); i++) {
array[i] = nacl::ToNativeHandle(handles[i]);
}
NaClMainForChromium(static_cast<int>(handles.size()), array.get(),
debug_enabled_);
}
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