Implement ScopedFD in terms of ScopedGeneric.

base/memory/shared_memory_posix.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 "base/memory/shared_memory.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
@@ skipping 12 matching lines @@
 
 #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
 
-using file_util::ScopedFD;
 using file_util::ScopedFILE;
 
 namespace base {
 
 namespace {
 
 LazyInstance<Lock>::Leaky g_thread_lock_ = LAZY_INSTANCE_INITIALIZER;
 
 }
 
@@ skipping 81 matching lines @@
   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;
 
   ScopedFILE fp;
   bool fix_size = true;
-  int readonly_fd_storage = -1;
-  ScopedFD readonly_fd(&readonly_fd_storage);
+  ScopedFD readonly_fd;
 
   FilePath path;
   if (options.name_deprecated == NULL || options.name_deprecated->empty()) {
     // It doesn't make sense to have a open-existing private piece of shmem
     DCHECK(!options.open_existing_deprecated);
     // Q: Why not use the shm_open() etc. APIs?
     // A: Because they're limited to 4mb on OS X.  FFFFFFFUUUUUUUUUUU
     fp.reset(base::CreateAndOpenTemporaryShmemFile(&path, options.executable));
 
     if (fp) {
       // Also open as readonly so that we can ShareReadOnlyToProcess.
-      *readonly_fd = HANDLE_EINTR(open(path.value().c_str(), O_RDONLY));
-      if (*readonly_fd < 0) {
+      readonly_fd.reset(HANDLE_EINTR(open(path.value().c_str(), O_RDONLY)));
+      if (!readonly_fd.is_valid()) {
         DPLOG(ERROR) << "open(\"" << path.value() << "\", O_RDONLY) failed";
         fp.reset();
       }
       // 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 (unlink(path.value().c_str()))
         PLOG(WARNING) << "unlink";
     }
   } else {
@@ skipping 31 matching lines @@
             "Invalid owner when opening existing shared memory file.";
         close(fd);
         return false;
       }
 
       // An existing file was opened, so its size should not be fixed.
       fix_size = false;
     }
 
     // Also open as readonly so that we can ShareReadOnlyToProcess.
-    *readonly_fd = HANDLE_EINTR(open(path.value().c_str(), O_RDONLY));
-    if (*readonly_fd < 0) {
+    readonly_fd.reset(HANDLE_EINTR(open(path.value().c_str(), O_RDONLY)));
+    if (!readonly_fd.is_valid()) {
       DPLOG(ERROR) << "open(\"" << path.value() << "\", O_RDONLY) failed";
       close(fd);
       fd = -1;
     }
     if (fd >= 0) {
       // "a+" is always appropriate: if it's a new file, a+ is similar to w+.
       fp.reset(fdopen(fd, "a+"));
     }
   }
   if (fp && fix_size) {
@@ skipping 45 matching lines @@
 
 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+";
   ScopedFILE fp(base::OpenFile(path, mode));
-  int readonly_fd_storage = -1;
-  ScopedFD readonly_fd(&readonly_fd_storage);
-  *readonly_fd = HANDLE_EINTR(open(path.value().c_str(), O_RDONLY));
-  if (*readonly_fd < 0) {
+  ScopedFD readonly_fd(HANDLE_EINTR(open(path.value().c_str(), O_RDONLY)));
+  if (!readonly_fd.is_valid()) {
     DPLOG(ERROR) << "open(\"" << path.value() << "\", O_RDONLY) failed";
   }
   return PrepareMapFile(fp.Pass(), readonly_fd.Pass());
 }
 
 #endif  // !defined(OS_ANDROID)
 
 bool SharedMemory::MapAt(off_t offset, size_t bytes) {
   if (mapped_file_ == -1)
     return false;
@@ skipping 64 matching lines @@
 
 void SharedMemory::UnlockDeprecated() {
   LockOrUnlockCommon(F_ULOCK);
   g_thread_lock_.Get().Release();
 }
 
 #if !defined(OS_ANDROID)
 bool SharedMemory::PrepareMapFile(ScopedFILE fp, ScopedFD readonly_fd) {
   DCHECK_EQ(-1, mapped_file_);
   DCHECK_EQ(-1, readonly_mapped_file_);
-  if (fp == NULL || *readonly_fd < 0) return false;
+  if (fp == NULL || !readonly_fd.is_valid()) 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;
 
   struct stat st = {};
   struct stat readonly_st = {};
   if (fstat(fileno(fp.get()), &st))
     NOTREACHED();
-  if (fstat(*readonly_fd, &readonly_st))
+  if (fstat(readonly_fd.get(), &readonly_st))
     NOTREACHED();
   if (st.st_dev != readonly_st.st_dev || st.st_ino != readonly_st.st_ino) {
     LOG(ERROR) << "writable and read-only inodes don't match; bailing";
     return false;
   }
 
   mapped_file_ = dup(fileno(fp.get()));
   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;
     }
   }
   inode_ = st.st_ino;
-  readonly_mapped_file_ = *readonly_fd.release();
+  readonly_mapped_file_ = readonly_fd.release();
 
   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) {
@@ skipping 64 matching lines @@
   new_handle->fd = new_fd;
   new_handle->auto_close = true;
 
   if (close_self)
     Close();
 
   return true;
 }
 
 }  // namespace base