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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 // This provides a wrapper around system calls which may be interrupted by a | 5 // This provides a wrapper around system calls which may be interrupted by a |
| 6 // signal and return EINTR. See man 7 signal. | 6 // signal and return EINTR. See man 7 signal. |
| 7 // To prevent long-lasting loops (which would likely be a bug, such as a signal | 7 // To prevent long-lasting loops (which would likely be a bug, such as a signal |
| 8 // that should be masked) to go unnoticed, there is a limit after which the | 8 // that should be masked) to go unnoticed, there is a limit after which the |
| 9 // caller will nonetheless see an EINTR in Debug builds. | 9 // caller will nonetheless see an EINTR in Debug builds. |
| 10 // | 10 // |
| 11 // On Windows, this wrapper macro does nothing. | 11 // On Windows, this wrapper macro does nothing. |
| 12 // |
| 13 // Don't wrap close calls in HANDLE_EINTR. Use IGNORE_EINTR if the return |
| 14 // value of close is significant. See http://crbug.com/269623. |
| 12 | 15 |
| 13 #ifndef BASE_POSIX_EINTR_WRAPPER_H_ | 16 #ifndef BASE_POSIX_EINTR_WRAPPER_H_ |
| 14 #define BASE_POSIX_EINTR_WRAPPER_H_ | 17 #define BASE_POSIX_EINTR_WRAPPER_H_ |
| 15 | 18 |
| 16 #include "build/build_config.h" | 19 #include "build/build_config.h" |
| 17 | 20 |
| 18 #if defined(OS_POSIX) | 21 #if defined(OS_POSIX) |
| 19 | 22 |
| 20 #include <errno.h> | 23 #include <errno.h> |
| 21 | 24 |
| 22 #if defined(NDEBUG) | 25 #if defined(NDEBUG) |
| 26 |
| 23 #define HANDLE_EINTR(x) ({ \ | 27 #define HANDLE_EINTR(x) ({ \ |
| 24 typeof(x) eintr_wrapper_result; \ | 28 typeof(x) eintr_wrapper_result; \ |
| 25 do { \ | 29 do { \ |
| 26 eintr_wrapper_result = (x); \ | 30 eintr_wrapper_result = (x); \ |
| 27 } while (eintr_wrapper_result == -1 && errno == EINTR); \ | 31 } while (eintr_wrapper_result == -1 && errno == EINTR); \ |
| 28 eintr_wrapper_result; \ | 32 eintr_wrapper_result; \ |
| 29 }) | 33 }) |
| 30 | 34 |
| 31 #else | 35 #else |
| 32 | 36 |
| 33 #define HANDLE_EINTR(x) ({ \ | 37 #define HANDLE_EINTR(x) ({ \ |
| 34 int eintr_wrapper_counter = 0; \ | 38 int eintr_wrapper_counter = 0; \ |
| 35 typeof(x) eintr_wrapper_result; \ | 39 typeof(x) eintr_wrapper_result; \ |
| 36 do { \ | 40 do { \ |
| 37 eintr_wrapper_result = (x); \ | 41 eintr_wrapper_result = (x); \ |
| 38 } while (eintr_wrapper_result == -1 && errno == EINTR && \ | 42 } while (eintr_wrapper_result == -1 && errno == EINTR && \ |
| 39 eintr_wrapper_counter++ < 100); \ | 43 eintr_wrapper_counter++ < 100); \ |
| 40 eintr_wrapper_result; \ | 44 eintr_wrapper_result; \ |
| 41 }) | 45 }) |
| 42 | 46 |
| 43 #endif // NDEBUG | 47 #endif // NDEBUG |
| 44 | 48 |
| 49 #define IGNORE_EINTR(x) ({ \ |
| 50 typeof(x) eintr_wrapper_result; \ |
| 51 do { \ |
| 52 eintr_wrapper_result = (x); \ |
| 53 if (eintr_wrapper_result == -1 && errno == EINTR) { \ |
| 54 eintr_wrapper_result = 0; \ |
| 55 } \ |
| 56 } while (0); \ |
| 57 eintr_wrapper_result; \ |
| 58 }) |
| 59 |
| 45 #else | 60 #else |
| 46 | 61 |
| 47 #define HANDLE_EINTR(x) (x) | 62 #define HANDLE_EINTR(x) (x) |
| 63 #define IGNORE_EINTR(x) (x) |
| 48 | 64 |
| 49 #endif // OS_POSIX | 65 #endif // OS_POSIX |
| 50 | 66 |
| 51 #endif // BASE_POSIX_EINTR_WRAPPER_H_ | 67 #endif // BASE_POSIX_EINTR_WRAPPER_H_ |
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