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 3 // found in the LICENSE file. 4 5 // This provides a wrapper around system calls which may be interrupted by a 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 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. 10 // 11 // On Windows, this wrapper macro does nothing. 12 13 #ifndef BASE_POSIX_EINTR_WRAPPER_H_ 14 #define BASE_POSIX_EINTR_WRAPPER_H_ 15 16 #include "build/build_config.h" 17 18 #if defined(OS_POSIX) 19 20 #include <errno.h> 21 22 #if defined(NDEBUG) 23 #define HANDLE_EINTR(x) ({ \ 24 typeof(x) eintr_wrapper_result; \ 25 do { \ 26 eintr_wrapper_result = (x); \ 27 } while (eintr_wrapper_result == -1 && errno == EINTR); \ 28 eintr_wrapper_result; \ 29 }) 30 31 #else 32 33 #define HANDLE_EINTR(x) ({ \ 34 int eintr_wrapper_counter = 0; \ 35 typeof(x) eintr_wrapper_result; \ 36 do { \ 37 eintr_wrapper_result = (x); \ 38 } while (eintr_wrapper_result == -1 && errno == EINTR && \ 39 eintr_wrapper_counter++ < 100); \ 40 eintr_wrapper_result; \ 41 }) 42 43 #endif // NDEBUG 44 45 #else 46 47 #define HANDLE_EINTR(x) (x) 48 49 #endif // OS_POSIX 50 51 #endif // BASE_POSIX_EINTR_WRAPPER_H_ 52
