Linux: print page to file rather than using shared memory to send it to the b...

base/file_util_posix.cc

 // Copyright (c) 2006-2008 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/file_util.h"
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <fnmatch.h>
@@ skipping 495 matching lines @@
   int ret_value = HANDLE_EINTR(read(fd, data, size));
   HANDLE_EINTR(close(fd));
   return ret_value;
 }
 
 int WriteFile(const FilePath& filename, const char* data, int size) {
   int fd = creat(filename.value().c_str(), 0666);
   if (fd < 0)
     return -1;
 
-  // Allow for partial writes
+  int rv = WriteFileDescriptor(fd, data, size);
+  HANDLE_EINTR(close(fd));
+  return rv;
+}
+
+int WriteFileDescriptor(const int fd, const char* data, int size) {
+  // Allow for partial writes.
   ssize_t bytes_written_total = 0;
-  do {
-    ssize_t bytes_written_partial =
-      HANDLE_EINTR(write(fd, data + bytes_written_total,
-                         size - bytes_written_total));
-    if (bytes_written_partial < 0) {
-      HANDLE_EINTR(close(fd));
+  for (ssize_t bytes_written_partial = 0; bytes_written_total < size;
+       bytes_written_total += bytes_written_partial) {
+    bytes_written_partial =
+        HANDLE_EINTR(write(fd, data + bytes_written_total,
+                           size - bytes_written_total));
+    if (bytes_written_partial < 0)
       return -1;
-    }
-    bytes_written_total += bytes_written_partial;
-  } while (bytes_written_total < size);
+  }
 
-  HANDLE_EINTR(close(fd));
   return bytes_written_total;
 }
 
 // Gets the current working directory for the process.
 bool GetCurrentDirectory(FilePath* dir) {
   char system_buffer[PATH_MAX] = "";
   if (!getcwd(system_buffer, sizeof(system_buffer))) {
     NOTREACHED();
     return false;
   }
@@ skipping 195 matching lines @@
     munmap(data_, length_);
   if (file_ != -1)
     close(file_);
 
   data_ = NULL;
   length_ = 0;
   file_ = -1;
 }
 
 } // namespace file_util