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 #define _GNU_SOURCE 17 18 #include <unistd.h> 19 #include <stdio.h> 20 #include <dirent.h> 21 #include <string.h> 22 #include <sys/stat.h> 23 #include <sys/ioctl.h> 24 #include <sys/types.h> 25 #include <sys/wait.h> 26 #include <string.h> 27 #include <dlfcn.h> 28 #include <sys/time.h> 29 #include <sys/mman.h> 30 #include <sys/syscall.h> 31 #include <sys/resource.h> 32 #include <fcntl.h> 33 #include <pthread.h> 34 #include <unistd.h> 35 #include <sched.h> 36 #include <stdlib.h> 37 #include <errno.h> 38 39 #define MSG_REQUEST 0x2 40 41 struct voice_svc_write_msg { 42 __u32 msg_type; 43 __u8 payload[0]; 44 }; 45 46 int main() { 47 int g_fd = 0; 48 char* dev_path = "/dev/voice_svc"; 49 50 g_fd = open(dev_path, O_RDWR); 51 if (g_fd < 0) { 52 return -1; 53 } 54 55 int size = sizeof(struct voice_svc_write_msg) + 4; 56 char* msg = (char*)malloc(size); 57 58 (msg + 4)[0] = 'A'; 59 (msg + 4)[1] = 'A'; 60 (msg + 4)[2] = 'A'; 61 (msg + 4)[3] = 'A'; 62 ((struct voice_svc_write_msg*)msg)->msg_type = MSG_REQUEST; 63 64 int i; 65 for (i = 0; i < 20; ++i) { 66 write(g_fd, msg, size); 67 sleep(1); 68 } 69 70 return 0; 71 } 72
