1 // Copyright 2010 Google LLC 2 // 3 // Redistribution and use in source and binary forms, with or without 4 // modification, are permitted provided that the following conditions are 5 // met: 6 // 7 // * Redistributions of source code must retain the above copyright 8 // notice, this list of conditions and the following disclaimer. 9 // * Redistributions in binary form must reproduce the above 10 // copyright notice, this list of conditions and the following disclaimer 11 // in the documentation and/or other materials provided with the 12 // distribution. 13 // * Neither the name of Google LLC nor the names of its 14 // contributors may be used to endorse or promote products derived from 15 // this software without specific prior written permission. 16 // 17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29 #ifndef COMMON_LINUX_EINTR_WRAPPER_H_ 30 #define COMMON_LINUX_EINTR_WRAPPER_H_ 31 32 #include <errno.h> 33 34 // This provides a wrapper around system calls which may be interrupted by a 35 // signal and return EINTR. See man 7 signal. 36 // 37 38 #define HANDLE_EINTR(x) ({ \ 39 __typeof__(x) eintr_wrapper_result; \ 40 do { \ 41 eintr_wrapper_result = (x); \ 42 } while (eintr_wrapper_result == -1 && errno == EINTR); \ 43 eintr_wrapper_result; \ 44 }) 45 46 #define IGNORE_EINTR(x) ({ \ 47 __typeof__(x) eintr_wrapper_result; \ 48 do { \ 49 eintr_wrapper_result = (x); \ 50 if (eintr_wrapper_result == -1 && errno == EINTR) { \ 51 eintr_wrapper_result = 0; \ 52 } \ 53 } while (0); \ 54 eintr_wrapper_result; \ 55 }) 56 57 #endif // COMMON_LINUX_EINTR_WRAPPER_H_ 58