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72 lines
2.7 KiB
C
72 lines
2.7 KiB
C
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// This provides a wrapper around system calls which may be interrupted by a
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// signal and return EINTR. See man 7 signal.
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// To prevent long-lasting loops (which would likely be a bug, such as a signal
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// that should be masked) to go unnoticed, there is a limit after which the
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// caller will nonetheless see an EINTR in Debug builds.
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//
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// On Windows and Fuchsia, this wrapper macro does nothing because there are no
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// signals.
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//
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// Don't wrap close calls in HANDLE_EINTR. Use IGNORE_EINTR if the return
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// value of close is significant. See http://crbug.com/269623.
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#ifndef BASE_POSIX_EINTR_WRAPPER_H_
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#define BASE_POSIX_EINTR_WRAPPER_H_
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#include "util/build_config.h"
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#if defined(OS_POSIX) && !defined(OS_FUCHSIA)
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#include <errno.h>
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#if defined(NDEBUG)
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#define HANDLE_EINTR(x) \
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({ \
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decltype(x) eintr_wrapper_result; \
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do { \
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eintr_wrapper_result = (x); \
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} while (eintr_wrapper_result == -1 && errno == EINTR); \
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eintr_wrapper_result; \
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})
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#else
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#define HANDLE_EINTR(x) \
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({ \
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int eintr_wrapper_counter = 0; \
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decltype(x) eintr_wrapper_result; \
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do { \
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eintr_wrapper_result = (x); \
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} while (eintr_wrapper_result == -1 && errno == EINTR && \
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eintr_wrapper_counter++ < 100); \
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eintr_wrapper_result; \
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})
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#endif // NDEBUG
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#define IGNORE_EINTR(x) \
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({ \
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decltype(x) eintr_wrapper_result; \
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do { \
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eintr_wrapper_result = (x); \
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if (eintr_wrapper_result == -1 && errno == EINTR) { \
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eintr_wrapper_result = 0; \
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} \
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} while (0); \
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eintr_wrapper_result; \
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})
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#else // !OS_POSIX || OS_FUCHSIA
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#define HANDLE_EINTR(x) (x)
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#define IGNORE_EINTR(x) (x)
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#endif // !OS_POSIX || OS_FUCHSIA
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#endif // BASE_POSIX_EINTR_WRAPPER_H_
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