diff options
Diffstat (limited to 'ipc/chromium/src/base/eintr_wrapper.h')
| -rw-r--r-- | ipc/chromium/src/base/eintr_wrapper.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/ipc/chromium/src/base/eintr_wrapper.h b/ipc/chromium/src/base/eintr_wrapper.h new file mode 100644 index 0000000000..c4a8b1a0ad --- /dev/null +++ b/ipc/chromium/src/base/eintr_wrapper.h @@ -0,0 +1,63 @@ +/* -*- 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_ |