// Copyright (c) 2010 Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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#ifndef COMMON_LINUX_EINTR_WRAPPER_H_
#define COMMON_LINUX_EINTR_WRAPPER_H_

#include <errno.h>

// This provides a wrapper around system calls which may be interrupted by a
// signal and return EINTR. See man 7 signal.
//


#if __cplusplus >= 201103L
#include <type_traits>
#define TYPEOF(x) std::remove_reference<decltype(x)>::type
#else
#define TYPEOF(x) typeof(x)
#endif


#define HANDLE_EINTR(x) ({ \
  TYPEOF(x) eintr_wrapper_result; \
  do { \
    eintr_wrapper_result = (x); \
  } while (eintr_wrapper_result == -1 && errno == EINTR); \
  eintr_wrapper_result; \
})

#define IGNORE_EINTR(x) ({ \
  typeof(x) eintr_wrapper_result; \
  do { \
    eintr_wrapper_result = (x); \
    if (eintr_wrapper_result == -1 && errno == EINTR) { \
      eintr_wrapper_result = 0; \
    } \
  } while (0); \
  eintr_wrapper_result; \
})

#endif  // COMMON_LINUX_EINTR_WRAPPER_H_
