base/eintr_wrapper.h

   1 // Copyright (c) 2009 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 // This provides a wrapper around system calls which may be interrupted by a
   6 // signal and return EINTR. See man 7 signal.
   7 //
   8 // On Windows, this wrapper macro does nothing.
   9
  10 #ifndef BASE_EINTR_WRAPPER_H_
  11 #define BASE_EINTR_WRAPPER_H_
  12 #pragma once
  13
  14 #include "build/build_config.h"
  15
  16 #if defined(OS_POSIX)
  17
  18 #include <errno.h>
  19
  20 #define HANDLE_EINTR(x) ({ \
  21   typeof(x) __eintr_result__; \
  22   do { \
  23     __eintr_result__ = x; \
  24   } while (__eintr_result__ == -1 && errno == EINTR); \
  25   __eintr_result__;\
  26 })
  27
  28 #else
  29
  30 #define HANDLE_EINTR(x) x
  31
  32 #endif  // OS_POSIX
  33
  34 #endif  // BASE_EINTR_WRAPPER_H_