michael@0: // Copyright (c) 2009 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "chrome/common/transport_dib.h"
michael@0: 
michael@0: #include <unistd.h>
michael@0: #include <sys/stat.h>
michael@0: 
michael@0: #include "base/eintr_wrapper.h"
michael@0: #include "base/shared_memory.h"
michael@0: 
michael@0: TransportDIB::TransportDIB()
michael@0:     : size_(0) {
michael@0: }
michael@0: 
michael@0: TransportDIB::TransportDIB(TransportDIB::Handle dib)
michael@0:     : shared_memory_(dib, false /* read write */),
michael@0:       size_(0) {
michael@0: }
michael@0: 
michael@0: TransportDIB::~TransportDIB() {
michael@0: }
michael@0: 
michael@0: // static
michael@0: TransportDIB* TransportDIB::Create(size_t size, uint32_t sequence_num) {
michael@0:   TransportDIB* dib = new TransportDIB;
michael@0:   if (!dib->shared_memory_.Create("", false /* read write */,
michael@0:                                   false /* do not open existing */, size)) {
michael@0:     delete dib;
michael@0:     return NULL;
michael@0:   }
michael@0: 
michael@0:   dib->size_ = size;
michael@0:   return dib;
michael@0: }
michael@0: 
michael@0: // static
michael@0: TransportDIB* TransportDIB::Map(TransportDIB::Handle handle) {
michael@0:   TransportDIB* dib = new TransportDIB(handle);
michael@0:   struct stat st;
michael@0:   fstat(handle.fd, &st);
michael@0: 
michael@0:   if (!dib->shared_memory_.Map(st.st_size)) {
michael@0:     delete dib;
michael@0:     HANDLE_EINTR(close(handle.fd));
michael@0:     return nullptr;
michael@0:   }
michael@0: 
michael@0:   dib->size_ = st.st_size;
michael@0: 
michael@0:   return dib;
michael@0: }
michael@0: 
michael@0: void* TransportDIB::memory() const {
michael@0:   return shared_memory_.memory();
michael@0: }
michael@0: 
michael@0: TransportDIB::Id TransportDIB::id() const {
michael@0:   return shared_memory_.id();
michael@0: }
michael@0: 
michael@0: TransportDIB::Handle TransportDIB::handle() const {
michael@0:   return shared_memory_.handle();
michael@0: }