mac: Remove POSIX shared memory.

base/memory/shared_memory_handle_mac.cc

 // Copyright 2015 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_handle.h"
 
 #include <mach/mach_vm.h>
 #include <stddef.h>
 #include <sys/mman.h>
 #include <unistd.h>
 
 #include "base/mac/mac_util.h"
 #include "base/posix/eintr_wrapper.h"
 
 namespace base {
 
-static_assert(sizeof(SharedMemoryHandle::Type) <=
-                  sizeof(SharedMemoryHandle::TypeWireFormat),
-              "Size of enum SharedMemoryHandle::Type exceeds size of type "
-              "transmitted over wire.");
-
-SharedMemoryHandle::SharedMemoryHandle() : type_(POSIX), file_descriptor_() {}
-
-SharedMemoryHandle::SharedMemoryHandle(
-    const base::FileDescriptor& file_descriptor)
-    : type_(POSIX), file_descriptor_(file_descriptor) {}
-
-SharedMemoryHandle::SharedMemoryHandle(int fd, bool auto_close)
-    : type_(POSIX), file_descriptor_(fd, auto_close) {}
+SharedMemoryHandle::SharedMemoryHandle() {}
 
 SharedMemoryHandle::SharedMemoryHandle(mach_vm_size_t size) {
-  type_ = MACH;
   mach_port_t named_right;
   kern_return_t kr = mach_make_memory_entry_64(
       mach_task_self(),
       &size,
       0,  // Address.
       MAP_MEM_NAMED_CREATE | VM_PROT_READ | VM_PROT_WRITE,
       &named_right,
       MACH_PORT_NULL);  // Parent handle.
   if (kr != KERN_SUCCESS) {
     memory_object_ = MACH_PORT_NULL;
     return;
   }
 
   memory_object_ = named_right;
   size_ = size;
   pid_ = GetCurrentProcId();
   ownership_passes_to_ipc_ = false;
 }
 
 SharedMemoryHandle::SharedMemoryHandle(mach_port_t memory_object,
                                        mach_vm_size_t size,
                                        base::ProcessId pid)
-    : type_(MACH),
-      memory_object_(memory_object),
+    : memory_object_(memory_object),
       size_(size),
       pid_(pid),
       ownership_passes_to_ipc_(false) {}
 
-SharedMemoryHandle::SharedMemoryHandle(const SharedMemoryHandle& handle)
-    : type_(handle.type_) {
+SharedMemoryHandle::SharedMemoryHandle(const SharedMemoryHandle& handle) {
   CopyRelevantData(handle);
 }
 
 SharedMemoryHandle& SharedMemoryHandle::operator=(
     const SharedMemoryHandle& handle) {
   if (this == &handle)
     return *this;
 
-  type_ = handle.type_;
   CopyRelevantData(handle);
   return *this;
 }
 
 SharedMemoryHandle SharedMemoryHandle::Duplicate() const {
-  switch (type_) {
-    case POSIX: {
-      if (!IsValid())
-        return SharedMemoryHandle();
+  if (!IsValid())
+    return SharedMemoryHandle(MACH_PORT_NULL, 0, 0);
 
-      int duped_fd = HANDLE_EINTR(dup(file_descriptor_.fd));
-      if (duped_fd < 0)
-        return SharedMemoryHandle();
-      return SharedMemoryHandle(duped_fd, true);
-    }
-    case MACH: {
-      if (!IsValid())
-        return SharedMemoryHandle(MACH_PORT_NULL, 0, 0);
-
-      // Increment the ref count.
-      kern_return_t kr = mach_port_mod_refs(mach_task_self(), memory_object_,
-                                            MACH_PORT_RIGHT_SEND, 1);
-      DCHECK_EQ(kr, KERN_SUCCESS);
-      SharedMemoryHandle handle(*this);
-      handle.SetOwnershipPassesToIPC(true);
-      return handle;
-    }
-  }
+  // Increment the ref count.
+  kern_return_t kr = mach_port_mod_refs(mach_task_self(), memory_object_,
+                                        MACH_PORT_RIGHT_SEND, 1);
+  DCHECK_EQ(kr, KERN_SUCCESS);
+  SharedMemoryHandle handle(*this);
+  handle.SetOwnershipPassesToIPC(true);
+  return handle;
 }
 
 bool SharedMemoryHandle::operator==(const SharedMemoryHandle& handle) const {
   if (!IsValid() && !handle.IsValid())
     return true;
 
-  if (type_ != handle.type_)
-    return false;
-
-  switch (type_) {
-    case POSIX:
-      return file_descriptor_ == handle.file_descriptor_;
-    case MACH:
-      return memory_object_ == handle.memory_object_ && size_ == handle.size_ &&
-             pid_ == handle.pid_;
-  }
+  return memory_object_ == handle.memory_object_ && size_ == handle.size_ &&
+         pid_ == handle.pid_;
 }
 
 bool SharedMemoryHandle::operator!=(const SharedMemoryHandle& handle) const {
   return !(*this == handle);
 }
 
-SharedMemoryHandle::Type SharedMemoryHandle::GetType() const {
-  return type_;
-}
-
 bool SharedMemoryHandle::IsValid() const {
-  switch (type_) {
-    case POSIX:
-      return file_descriptor_.fd >= 0;
-    case MACH:
-      return memory_object_ != MACH_PORT_NULL;
-  }
-}
-
-void SharedMemoryHandle::SetFileHandle(int fd, bool auto_close) {
-  DCHECK(!IsValid());
-  file_descriptor_.fd = fd;
-  file_descriptor_.auto_close = auto_close;
-  type_ = POSIX;
-}
-
-const FileDescriptor SharedMemoryHandle::GetFileDescriptor() const {
-  DCHECK_EQ(type_, POSIX);
-  return file_descriptor_;
+  return memory_object_ != MACH_PORT_NULL;
 }
 
 mach_port_t SharedMemoryHandle::GetMemoryObject() const {
-  DCHECK_EQ(type_, MACH);
   return memory_object_;
 }
 
 bool SharedMemoryHandle::GetSize(size_t* size) const {
-  if (!IsValid())
-    return false;
+  if (!IsValid()) {
+    *size = 0;
+    return true;
+  }
 
-  switch (type_) {
-    case SharedMemoryHandle::POSIX:
-      struct stat st;
-      if (fstat(file_descriptor_.fd, &st) != 0)
-        return false;
-      if (st.st_size < 0)
-        return false;
-      *size = st.st_size;
-      return true;
-    case SharedMemoryHandle::MACH:
-      *size = size_;
-      return true;
-  }
+  *size = size_;
+  return true;
 }
 
 bool SharedMemoryHandle::MapAt(off_t offset,
                                size_t bytes,
                                void** memory,
                                bool read_only) {
   DCHECK(IsValid());
-  switch (type_) {
-    case SharedMemoryHandle::POSIX:
-      *memory = mmap(nullptr, bytes, PROT_READ | (read_only ? 0 : PROT_WRITE),
-                     MAP_SHARED, file_descriptor_.fd, offset);
-
-      return *memory && *memory != reinterpret_cast<void*>(-1);
-    case SharedMemoryHandle::MACH:
-      // The flag VM_PROT_IS_MASK is only supported on OSX 10.7+.
-      DCHECK(mac::IsOSLionOrLater());
-
-      DCHECK_EQ(pid_, GetCurrentProcId());
-      kern_return_t kr = mach_vm_map(
-          mach_task_self(),
-          reinterpret_cast<mach_vm_address_t*>(memory),    // Output parameter
-          bytes,
-          0,                                               // Alignment mask
-          VM_FLAGS_ANYWHERE,
-          memory_object_,
-          offset,
-          FALSE,                                           // Copy
-          VM_PROT_READ | (read_only ? 0 : VM_PROT_WRITE),  // Current protection
-          VM_PROT_WRITE | VM_PROT_READ | VM_PROT_IS_MASK,  // Maximum protection
-          VM_INHERIT_NONE);
-      return kr == KERN_SUCCESS;
-  }
+  DCHECK_EQ(pid_, GetCurrentProcId());
+  kern_return_t kr = mach_vm_map(
+      mach_task_self(),
+      reinterpret_cast<mach_vm_address_t*>(memory),  // Output parameter
+      bytes,
+      0,  // Alignment mask
+      VM_FLAGS_ANYWHERE, memory_object_, offset,
+      FALSE,                                           // Copy
+      VM_PROT_READ | (read_only ? 0 : VM_PROT_WRITE),  // Current protection
+      VM_PROT_WRITE | VM_PROT_READ | VM_PROT_IS_MASK,  // Maximum protection
+      VM_INHERIT_NONE);
+  return kr == KERN_SUCCESS;
 }
 
 void SharedMemoryHandle::Close() const {
   if (!IsValid())
     return;
 
-  switch (type_) {
-    case POSIX:
-      if (IGNORE_EINTR(close(file_descriptor_.fd)) < 0)
-        DPLOG(ERROR) << "Error closing fd.";
-      break;
-    case MACH:
-      kern_return_t kr = mach_port_deallocate(mach_task_self(), memory_object_);
-      if (kr != KERN_SUCCESS)
-        DPLOG(ERROR) << "Error deallocating mach port: " << kr;
-      break;
-  }
+  kern_return_t kr = mach_port_deallocate(mach_task_self(), memory_object_);
+  if (kr != KERN_SUCCESS)
+    DPLOG(ERROR) << "Error deallocating mach port: " << kr;
 }
 
 void SharedMemoryHandle::SetOwnershipPassesToIPC(bool ownership_passes) {
-  DCHECK_EQ(type_, MACH);
   ownership_passes_to_ipc_ = ownership_passes;
 }
 
 bool SharedMemoryHandle::OwnershipPassesToIPC() const {
-  DCHECK_EQ(type_, MACH);
   return ownership_passes_to_ipc_;
 }
 
 void SharedMemoryHandle::CopyRelevantData(const SharedMemoryHandle& handle) {
-  switch (type_) {
-    case POSIX:
-      file_descriptor_ = handle.file_descriptor_;
-      break;
-    case MACH:
-      memory_object_ = handle.memory_object_;
-      size_ = handle.size_;
-      pid_ = handle.pid_;
-      ownership_passes_to_ipc_ = handle.ownership_passes_to_ipc_;
-      break;
-  }
+  memory_object_ = handle.memory_object_;
+  size_ = handle.size_;
+  pid_ = handle.pid_;
+  ownership_passes_to_ipc_ = handle.ownership_passes_to_ipc_;
 }
 
 }  // namespace base