1 /* 2 * Copyright 2012, The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 18 /** 19 * The probability of a syscall failing from 0.0 to 1.0 20 */ 21 #define PROBABILITY 0.9 22 23 24 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <errno.h> 28 29 /* for various intercepted calls */ 30 #include <sys/types.h> 31 #include <sys/socket.h> 32 #include <sys/stat.h> 33 #include <fcntl.h> 34 35 /* For builds on glibc */ 36 #define __USE_GNU 37 #include <dlfcn.h> 38 39 #include "interrupter.h" 40 41 static int probability = PROBABILITY * RAND_MAX; 42 43 static int maybe_interrupt() { 44 if (rand() < probability) { 45 return 1; 46 } 47 return 0; 48 } 49 50 DEFINE_INTERCEPT(read, ssize_t, int, void*, size_t); 51 DEFINE_INTERCEPT(write, ssize_t, int, const void*, size_t); 52 DEFINE_INTERCEPT(accept, int, int, struct sockaddr*, socklen_t*); 53 DEFINE_INTERCEPT(creat, int, const char*, mode_t); 54
