Add error handling to random access file

runtime/bin/file_linux.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/file.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <unistd.h>
@@ skipping 67 matching lines @@
   return TEMP_FAILURE_RETRY(lseek(handle_->fd(), position, SEEK_SET) != -1);
 }
 
 
 bool File::Truncate(int64_t length) {
   ASSERT(handle_->fd() >= 0);
   return TEMP_FAILURE_RETRY(ftruncate(handle_->fd(), length) != -1);
 }
 
 
-void File::Flush() {
+bool File::Flush() {
   ASSERT(handle_->fd() >= 0);
-  TEMP_FAILURE_RETRY(fsync(handle_->fd()));
+  return TEMP_FAILURE_RETRY(fsync(handle_->fd()) != -1);
 }
 
 
 off_t File::Length() {
   ASSERT(handle_->fd() >= 0);
   off_t position = TEMP_FAILURE_RETRY(lseek(handle_->fd(), 0, SEEK_CUR));
   if (position < 0) {
     // The file is not capable of seeking. Return an error.
     return -1;
   }
@@ skipping 119 matching lines @@
   int result = fstat(fd, &buf);
   if (result == -1) {
     FATAL2("Failed stat on file descriptor %d: %s", fd, strerror(errno));
   }
   if (S_ISCHR(buf.st_mode)) return kTerminal;
   if (S_ISFIFO(buf.st_mode)) return kPipe;
   if (S_ISSOCK(buf.st_mode)) return kSocket;
   if (S_ISREG(buf.st_mode)) return kFile;
   return kOther;
 }