| // 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. |
| // To prevent long-lasting loops (which would likely be a bug, such as a signal |
| // that should be masked) to go unnoticed, there is a limit after which the |
| // caller will nonetheless see an EINTR in Debug builds. |
| // |
| // On Windows, this wrapper macro does nothing. |
| // |
| // 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_POSIX_EINTR_WRAPPER_H_ |
| #define BASE_POSIX_EINTR_WRAPPER_H_ |
| |
| #include "build/build_config.h" |
| |
| #if defined(OS_POSIX) |
| |
| #include <errno.h> |
| |
| #if defined(NDEBUG) |
| |
| #define HANDLE_EINTR(x) ({ \ |
| decltype(x) eintr_wrapper_result; \ |
| do { \ |
| eintr_wrapper_result = (x); \ |
| } while (eintr_wrapper_result == -1 && errno == EINTR); \ |
| eintr_wrapper_result; \ |
| }) |
| |
| #else |
| |
| #define HANDLE_EINTR(x) ({ \ |
| int eintr_wrapper_counter = 0; \ |
| decltype(x) eintr_wrapper_result; \ |
| do { \ |
| eintr_wrapper_result = (x); \ |
| } while (eintr_wrapper_result == -1 && errno == EINTR && \ |
| eintr_wrapper_counter++ < 100); \ |
| eintr_wrapper_result; \ |
| }) |
| |
| #endif // NDEBUG |
| |
| #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; \ |
| }) |
| |
| #else |
| |
| #define HANDLE_EINTR(x) (x) |
| #define IGNORE_EINTR(x) (x) |
| |
| #endif // OS_POSIX |
| |
| #endif // BASE_POSIX_EINTR_WRAPPER_H_ |