1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "base/files/memory_mapped_file.h" 6 7 #include <sys/mman.h> 8 #include <sys/stat.h> 9 #include <unistd.h> 10 11 #include "base/logging.h" 12 #include "base/threading/thread_restrictions.h" 13 14 namespace base { 15 16 MemoryMappedFile::MemoryMappedFile() 17 : file_(kInvalidPlatformFileValue), 18 data_(NULL), 19 length_(0) { 20 } 21 22 bool MemoryMappedFile::MapFileToMemoryInternal() { 23 ThreadRestrictions::AssertIOAllowed(); 24 25 struct stat file_stat; 26 if (fstat(file_, &file_stat) == kInvalidPlatformFileValue) { 27 DPLOG(ERROR) << "fstat " << file_; 28 return false; 29 } 30 length_ = file_stat.st_size; 31 32 data_ = static_cast<uint8*>( 33 mmap(NULL, length_, PROT_READ, MAP_SHARED, file_, 0)); 34 if (data_ == MAP_FAILED) 35 DPLOG(ERROR) << "mmap " << file_; 36 37 return data_ != MAP_FAILED; 38 } 39 40 void MemoryMappedFile::CloseHandles() { 41 ThreadRestrictions::AssertIOAllowed(); 42 43 if (data_ != NULL) 44 munmap(data_, length_); 45 if (file_ != kInvalidPlatformFileValue) 46 close(file_); 47 48 data_ = NULL; 49 length_ = 0; 50 file_ = kInvalidPlatformFileValue; 51 } 52 53 } // namespace base 54
