Move shared_memory into base/memory subdirectory.

base/shared_memory_posix.cc

Index: base/shared_memory_posix.cc
diff --git a/base/shared_memory_posix.cc b/base/shared_memory_posix.cc
deleted file mode 100644
index 607d665e61767fceeccdcfa966b84177c69ee71b..0000000000000000000000000000000000000000
--- a/base/shared_memory_posix.cc
+++ /dev/null
@@ -1,388 +0,0 @@
-// 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 "base/shared_memory.h"
-
-#include <errno.h>
-#include <fcntl.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-#include "base/file_util.h"
-#include "base/lazy_instance.h"
-#include "base/logging.h"
-#include "base/threading/platform_thread.h"
-#include "base/safe_strerror_posix.h"
-#include "base/synchronization/lock.h"
-#include "base/threading/thread_restrictions.h"
-#include "base/utf_string_conversions.h"
-
-#if defined(OS_MACOSX)
-#include "base/mac/foundation_util.h"
-#endif  // OS_MACOSX
-
-#if defined(OS_ANDROID)
-#include "base/os_compat_android.h"
-#include "third_party/ashmem/ashmem.h"
-#endif
-
-namespace base {
-
-namespace {
-
-// Paranoia. Semaphores and shared memory segments should live in different
-// namespaces, but who knows what's out there.
-const char kSemaphoreSuffix[] = "-sem";
-
-LazyInstance<Lock>::Leaky g_thread_lock_ = LAZY_INSTANCE_INITIALIZER;
-
-}
-
-SharedMemory::SharedMemory()
-    : mapped_file_(-1),
-      inode_(0),
-      mapped_size_(0),
-      memory_(NULL),
-      read_only_(false),
-      requested_size_(0) {
-}
-
-SharedMemory::SharedMemory(SharedMemoryHandle handle, bool read_only)
-    : mapped_file_(handle.fd),
-      inode_(0),
-      mapped_size_(0),
-      memory_(NULL),
-      read_only_(read_only),
-      requested_size_(0) {
-  struct stat st;
-  if (fstat(handle.fd, &st) == 0) {
-    // If fstat fails, then the file descriptor is invalid and we'll learn this
-    // fact when Map() fails.
-    inode_ = st.st_ino;
-  }
-}
-
-SharedMemory::SharedMemory(SharedMemoryHandle handle, bool read_only,
-                           ProcessHandle process)
-    : mapped_file_(handle.fd),
-      inode_(0),
-      mapped_size_(0),
-      memory_(NULL),
-      read_only_(read_only),
-      requested_size_(0) {
-  // We don't handle this case yet (note the ignored parameter); let's die if
-  // someone comes calling.
-  NOTREACHED();
-}
-
-SharedMemory::~SharedMemory() {
-  Close();
-}
-
-// static
-bool SharedMemory::IsHandleValid(const SharedMemoryHandle& handle) {
-  return handle.fd >= 0;
-}
-
-// static
-SharedMemoryHandle SharedMemory::NULLHandle() {
-  return SharedMemoryHandle();
-}
-
-// static
-void SharedMemory::CloseHandle(const SharedMemoryHandle& handle) {
-  DCHECK_GE(handle.fd, 0);
-  if (HANDLE_EINTR(close(handle.fd)) < 0)
-    DPLOG(ERROR) << "close";
-}
-
-bool SharedMemory::CreateAndMapAnonymous(size_t size) {
-  return CreateAnonymous(size) && Map(size);
-}
-
-#if !defined(OS_ANDROID)
-// Chromium mostly only uses the unique/private shmem as specified by
-// "name == L"". The exception is in the StatsTable.
-// TODO(jrg): there is no way to "clean up" all unused named shmem if
-// we restart from a crash.  (That isn't a new problem, but it is a problem.)
-// In case we want to delete it later, it may be useful to save the value
-// of mem_filename after FilePathForMemoryName().
-bool SharedMemory::Create(const SharedMemoryCreateOptions& options) {
-  DCHECK_EQ(-1, mapped_file_);
-  if (options.size == 0) return false;
-
-  if (options.size > static_cast<size_t>(std::numeric_limits<int>::max()))
-    return false;
-
-  // This function theoretically can block on the disk, but realistically
-  // the temporary files we create will just go into the buffer cache
-  // and be deleted before they ever make it out to disk.
-  base::ThreadRestrictions::ScopedAllowIO allow_io;
-
-  FILE *fp;
-  bool fix_size = true;
-
-  FilePath path;
-  if (options.name == NULL || options.name->empty()) {
-    // It doesn't make sense to have a open-existing private piece of shmem
-    DCHECK(!options.open_existing);
-    // Q: Why not use the shm_open() etc. APIs?
-    // A: Because they're limited to 4mb on OS X.  FFFFFFFUUUUUUUUUUU
-    fp = file_util::CreateAndOpenTemporaryShmemFile(&path, options.executable);
-
-    // Deleting the file prevents anyone else from mapping it in (making it
-    // private), and prevents the need for cleanup (once the last fd is closed,
-    // it is truly freed).
-    if (fp) {
-      if (unlink(path.value().c_str()))
-        PLOG(WARNING) << "unlink";
-    }
-  } else {
-    if (!FilePathForMemoryName(*options.name, &path))
-      return false;
-
-    fp = file_util::OpenFile(path, "w+x");
-    if (fp == NULL && options.open_existing) {
-      // "w+" will truncate if it already exists.
-      fp = file_util::OpenFile(path, "a+");
-      fix_size = false;
-    }
-  }
-  if (fp && fix_size) {
-    // Get current size.
-    struct stat stat;
-    if (fstat(fileno(fp), &stat) != 0) {
-      file_util::CloseFile(fp);
-      return false;
-    }
-    const size_t current_size = stat.st_size;
-    if (current_size != options.size) {
-      if (HANDLE_EINTR(ftruncate(fileno(fp), options.size)) != 0) {
-        file_util::CloseFile(fp);
-        return false;
-      }
-    }
-    requested_size_ = options.size;
-  }
-  if (fp == NULL) {
-#if !defined(OS_MACOSX)
-    PLOG(ERROR) << "Creating shared memory in " << path.value() << " failed";
-    FilePath dir = path.DirName();
-    if (access(dir.value().c_str(), W_OK | X_OK) < 0) {
-      PLOG(ERROR) << "Unable to access(W_OK|X_OK) " << dir.value();
-      if (dir.value() == "/dev/shm") {
-        LOG(FATAL) << "This is frequently caused by incorrect permissions on "
-                   << "/dev/shm.  Try 'sudo chmod 1777 /dev/shm' to fix.";
-      }
-    }
-#else
-    PLOG(ERROR) << "Creating shared memory in " << path.value() << " failed";
-#endif
-    return false;
-  }
-
-  return PrepareMapFile(fp);
-}
-
-// Our current implementation of shmem is with mmap()ing of files.
-// These files need to be deleted explicitly.
-// In practice this call is only needed for unit tests.
-bool SharedMemory::Delete(const std::string& name) {
-  FilePath path;
-  if (!FilePathForMemoryName(name, &path))
-    return false;
-
-  if (file_util::PathExists(path)) {
-    return file_util::Delete(path, false);
-  }
-
-  // Doesn't exist, so success.
-  return true;
-}
-
-bool SharedMemory::Open(const std::string& name, bool read_only) {
-  FilePath path;
-  if (!FilePathForMemoryName(name, &path))
-    return false;
-
-  read_only_ = read_only;
-
-  const char *mode = read_only ? "r" : "r+";
-  FILE *fp = file_util::OpenFile(path, mode);
-  return PrepareMapFile(fp);
-}
-
-#endif  // !defined(OS_ANDROID)
-
-bool SharedMemory::MapAt(off_t offset, size_t bytes) {
-  if (mapped_file_ == -1)
-    return false;
-
-  if (bytes > static_cast<size_t>(std::numeric_limits<int>::max()))
-    return false;
-
-#if defined(OS_ANDROID)
-  if (bytes == 0) {
-    int ashmem_bytes = ashmem_get_size_region(mapped_file_);
-    if (ashmem_bytes < 0)
-      return false;
-
-    DCHECK_GE(static_cast<uint32>(ashmem_bytes), bytes);
-    // The caller wants to determine the map region size from ashmem.
-    bytes = ashmem_bytes - offset;
-    // TODO(port): we set the created size here so that it is available in
-    // transport_dib_android.cc. We should use ashmem_get_size_region()
-    // in transport_dib_android.cc.
-    mapped_size_ = ashmem_bytes;
-  }
-#endif
-
-  memory_ = mmap(NULL, bytes, PROT_READ | (read_only_ ? 0 : PROT_WRITE),
-                 MAP_SHARED, mapped_file_, offset);
-
-  bool mmap_succeeded = memory_ != (void*)-1 && memory_ != NULL;
-  if (mmap_succeeded) {
-#if !defined(OS_ANDROID)
-    mapped_size_ = bytes;
-#endif
-    DCHECK_EQ(0U, reinterpret_cast<uintptr_t>(memory_) &
-        (SharedMemory::MAP_MINIMUM_ALIGNMENT - 1));
-  } else {
-    memory_ = NULL;
-  }
-
-  return mmap_succeeded;
-}
-
-bool SharedMemory::Unmap() {
-  if (memory_ == NULL)
-    return false;
-
-  munmap(memory_, mapped_size_);
-  memory_ = NULL;
-  mapped_size_ = 0;
-  return true;
-}
-
-SharedMemoryHandle SharedMemory::handle() const {
-  return FileDescriptor(mapped_file_, false);
-}
-
-void SharedMemory::Close() {
-  Unmap();
-
-  if (mapped_file_ > 0) {
-    if (HANDLE_EINTR(close(mapped_file_)) < 0)
-      PLOG(ERROR) << "close";
-    mapped_file_ = -1;
-  }
-}
-
-void SharedMemory::Lock() {
-  g_thread_lock_.Get().Acquire();
-  LockOrUnlockCommon(F_LOCK);
-}
-
-void SharedMemory::Unlock() {
-  LockOrUnlockCommon(F_ULOCK);
-  g_thread_lock_.Get().Release();
-}
-
-#if !defined(OS_ANDROID)
-bool SharedMemory::PrepareMapFile(FILE *fp) {
-  DCHECK_EQ(-1, mapped_file_);
-  if (fp == NULL) return false;
-
-  // This function theoretically can block on the disk, but realistically
-  // the temporary files we create will just go into the buffer cache
-  // and be deleted before they ever make it out to disk.
-  base::ThreadRestrictions::ScopedAllowIO allow_io;
-
-  file_util::ScopedFILE file_closer(fp);
-
-  mapped_file_ = dup(fileno(fp));
-  if (mapped_file_ == -1) {
-    if (errno == EMFILE) {
-      LOG(WARNING) << "Shared memory creation failed; out of file descriptors";
-      return false;
-    } else {
-      NOTREACHED() << "Call to dup failed, errno=" << errno;
-    }
-  }
-
-  struct stat st;
-  if (fstat(mapped_file_, &st))
-    NOTREACHED();
-  inode_ = st.st_ino;
-
-  return true;
-}
-#endif
-
-// For the given shmem named |mem_name|, return a filename to mmap()
-// (and possibly create).  Modifies |filename|.  Return false on
-// error, or true of we are happy.
-bool SharedMemory::FilePathForMemoryName(const std::string& mem_name,
-                                         FilePath* path) {
-  // mem_name will be used for a filename; make sure it doesn't
-  // contain anything which will confuse us.
-  DCHECK_EQ(std::string::npos, mem_name.find('/'));
-  DCHECK_EQ(std::string::npos, mem_name.find('\0'));
-
-  FilePath temp_dir;
-  if (!file_util::GetShmemTempDir(&temp_dir, false))
-    return false;
-
-#if !defined(OS_MACOSX)
-#if defined(GOOGLE_CHROME_BUILD)
-  std::string name_base = std::string("com.google.Chrome");
-#else
-  std::string name_base = std::string("org.chromium.Chromium");
-#endif
-#else  // OS_MACOSX
-  std::string name_base = std::string(base::mac::BaseBundleID());
-#endif  // OS_MACOSX
-  *path = temp_dir.AppendASCII(name_base + ".shmem." + mem_name);
-  return true;
-}
-
-void SharedMemory::LockOrUnlockCommon(int function) {
-  DCHECK_GE(mapped_file_, 0);
-  while (lockf(mapped_file_, function, 0) < 0) {
-    if (errno == EINTR) {
-      continue;
-    } else if (errno == ENOLCK) {
-      // temporary kernel resource exaustion
-      base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(500));
-      continue;
-    } else {
-      NOTREACHED() << "lockf() failed."
-                   << " function:" << function
-                   << " fd:" << mapped_file_
-                   << " errno:" << errno
-                   << " msg:" << safe_strerror(errno);
-    }
-  }
-}
-
-bool SharedMemory::ShareToProcessCommon(ProcessHandle process,
-                                        SharedMemoryHandle *new_handle,
-                                        bool close_self) {
-  const int new_fd = dup(mapped_file_);
-  if (new_fd < 0) {
-    DPLOG(ERROR) << "dup() failed.";
-    return false;
-  }
-
-  new_handle->fd = new_fd;
-  new_handle->auto_close = true;
-
-  if (close_self)
-    Close();
-
-  return true;
-}
-
-}  // namespace base