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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
// Copyright (c) 2012 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.
// This provides a wrapper around system calls which may be interrupted by a
// signal and return EINTR. See man 7 signal.
//
// On Windows, this wrapper macro does nothing because there are no
// signals.
//
// Don't wrap close calls in HANDLE_EINTR. Use IGNORE_EINTR if the return
// value of close is significant. See http://crbug.com/269623.
#ifndef BASE_EINTR_WRAPPER_H_
#define BASE_EINTR_WRAPPER_H_
#include "build/build_config.h"
#if defined(OS_POSIX)
# include <errno.h>
# define HANDLE_EINTR(x) \
({ \
decltype(x) eintr_wrapper_result; \
do { \
eintr_wrapper_result = (x); \
} while (eintr_wrapper_result == -1 && errno == EINTR); \
eintr_wrapper_result; \
})
# define IGNORE_EINTR(x) \
({ \
decltype(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; \
})
# define HANDLE_RV_EINTR(x) \
({ \
decltype(x) eintr_wrapper_result; \
do { \
eintr_wrapper_result = (x); \
} while (eintr_wrapper_result == EINTR); \
eintr_wrapper_result; \
})
#else
# define HANDLE_EINTR(x) (x)
# define IGNORE_EINTR(x) (x)
# define HANDLE_RV_EINTR(x) (x)
#endif // OS_POSIX
#endif // !BASE_EINTR_WRAPPER_H_
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