Include What You Use: #include <errno.h> where errno is used, or use DPLOG

base/files/memory_mapped_file_posix.cc

 // Copyright 2013 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/files/memory_mapped_file.h"
 
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <unistd.h>
 
 #include "base/logging.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/threading/thread_restrictions.h"
 
 namespace base {
 
 MemoryMappedFile::MemoryMappedFile()
     : file_(kInvalidPlatformFileValue),
       data_(NULL),
       length_(0) {
 }
 
 bool MemoryMappedFile::MapFileToMemoryInternal() {
   ThreadRestrictions::AssertIOAllowed();
 
   struct stat file_stat;
   if (fstat(file_, &file_stat) == kInvalidPlatformFileValue) {
-    DLOG(ERROR) << "Couldn't fstat " << file_ << ", errno " << errno;
+    DPLOG(ERROR) << "fstat " << file_;
     return false;
   }
   length_ = file_stat.st_size;
 
   data_ = static_cast<uint8*>(
       mmap(NULL, length_, PROT_READ, MAP_SHARED, file_, 0));
   if (data_ == MAP_FAILED)
-    DLOG(ERROR) << "Couldn't mmap " << file_ << ", errno " << errno;
+    DPLOG(ERROR) << "mmap " << file_;
 
   return data_ != MAP_FAILED;
 }
 
 void MemoryMappedFile::CloseHandles() {
   ThreadRestrictions::AssertIOAllowed();
 
   if (data_ != NULL)
     munmap(data_, length_);
   if (file_ != kInvalidPlatformFileValue)
     ignore_result(HANDLE_EINTR(close(file_)));
 
   data_ = NULL;
   length_ = 0;
   file_ = kInvalidPlatformFileValue;
 }
 
 }  // namespace base