linux应用层获取输入事件
在Linux输入系统从内核层次较详细的介绍了输入系统构架,linux输入设备驱动实列介绍了如何实现一个简单的输如设备驱动。下面主要介绍如何通过非阻塞的方式,在应用层获取输入事件,代码如下:#include#include#include#include#include#include#include#include#include#i
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在Linux输入系统从内核层次较详细的介绍了输入系统构架,linux输入设备驱动实列介绍了如何实现一个简单的输
如设备驱动。下面主要介绍如何通过非阻塞的方式,在应用层获取输入事件,代码如下:
#include <fcntl.h> #include <stdlib.h> #include <utils/Log.h> #include <unistd.h> #include <sys/mman.h> #include <sys/ioctl.h> #include <cutils/fs.h> #include <cutils/sockets.h> #include <errno.h> #include <sys/inotify.h> #include <sys/limits.h> #include <sys/poll.h> #include <linux/input.h> #include <cutils/list.h> #include <cutils/android_reboot.h> #include <cutils/sockets.h> #include <cutils/iosched_policy.h> #include <cutils/fs.h> #include <termios.h> #include <sys/system_properties.h> #define LOGV(...) __android_log_print(ANDROID_LOG_SILENT, LOG_TAG, __VA_ARGS__) #define LOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__) #define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__) #define DEVICE "/dev/input/event0" struct cmd{ char command[32]; char status[32]; char recovery[1024]; }cmdRecovery; int write_recoveryCmd(){ //char cmdRecovery[] ="boot-recovery"; char *revCmd="recovery\n--update_package=/storage/usbotg/usbotg-sda/mt8127_box_p1v1-ota-eng.innoplay.zip\n--locale=en_US"; memset(&cmdRecovery ,0 ,sizeof(cmdRecovery)); memcpy(cmdRecovery.command,"boot-recovery",sizeof("boot-recovery")); //memcpy(cmdRecovery.recovery,"recovery",sizeof("recovery")); //memcpy(cmdRecovery.recovery,revCmd,sizeof(*revCmd)); memcpy(cmdRecovery.recovery,"recovery\n--update_package=/storage/usbotg/usbotg-sda/mt8127_box_p1v1-ota-eng.innoplay.zip\n--locale=en_US",sizeof("recovery\n--update_package=/storage/usbotg/usbotg-sda/mt8127_box_p1v1-ota-eng.innoplay.zip\n--locale=en_US")); int miscFd = open("/dev/misc", O_WRONLY | O_SYNC); if (miscFd<0) { printf("Can't open /dev/misc (%s)\n", strerror(errno)); return -1; } int count = write(miscFd,(char*) &cmdRecovery, sizeof(cmdRecovery)); printf("sizeof(cmdRecovery)=%d count=%d \n",sizeof(cmdRecovery),count); if (count != sizeof(cmdRecovery)) { printf("Failed writing /dev/misc (%s)\n", strerror(errno)); close(miscFd); return -1; } else{ printf("the recovery len =%d \n",sizeof(*revCmd)); printf("write the cmd =%s \n",cmdRecovery.recovery); sync(); } close(miscFd); return 0; } int write_commandFile(){ char *cmd="--update_package=/storage/usbotg/usbotg-sda/mt8127_box_p1v1-ota-eng.innoplay.zip\n--locale=en_US"; int fd=open("/cache/recovery/command", O_RDWR | O_CREAT |O_SYNC, 0644); if(fd<0){ LOGE("creat the command file failed!\n"); return -1; } int n=write(fd,cmd,sizeof(*cmd)); //fix me !after wirte successfully,but nothing in the file if(n!=sizeof(*cmd)){ printf("write the cmd failed! (%s) \n ", strerror(errno)); return -1; close(fd); } sync(); close(fd); return 0; } int read_recoveryCmd(){ struct cmd readCmd; memset(&readCmd,0,sizeof(readCmd)); int miscFd1 = open("/dev/misc", O_RDONLY); if (miscFd1<0) { printf("Can't open /dev/misc (%s)\n", strerror(errno)); return -1; } int n2=read(miscFd1,&readCmd,sizeof(readCmd)); if(n2!=sizeof(readCmd)){ printf("read error (%s)!", strerror(errno)); close(miscFd1); } close(miscFd1); printf("cmd=%s \n",readCmd.command); printf("recovery =%s \n",readCmd.recovery); return 0; } int main(int argc,char *argv[]){ int fd=0,pollRes=0,res=0; struct pollfd ufds; struct input_event event; fd = open(DEVICE, O_RDWR); if(fd<0){ printf("open recovery key device failed!\n"); return -1; } printf("in the recovery.c\n"); memset(&ufds,0 ,sizeof(ufds)); memset(&event,0 ,sizeof(event)); ufds.fd=fd ; ufds.events = POLLIN; while(1){ printf("in the recovery.c poll!\n"); pollRes =poll(&ufds,1,-1); if(pollRes<0){ printf("poll failed error= %s !\n", strerror(errno)); return -1; } res = read(ufds.fd,&event,sizeof(event)); if(res!= sizeof(event)){ printf("read failed error= %s !\n", strerror(errno)); return -1; } printf("event.code =%d event.value=%d \n",event.code , event.value); if((event.code==KEY_DOWN) ||(event.code==KEY_ENTER)) break; } if(write_recoveryCmd()){ printf("write recovery command error!\n"); return -1; } //property_set("sys.shutdown.requested","1 recovery"); //property_set("persist.sys.safemode","1"); sleep(1); //property_set("sys.powerctl","reboot,recovery"); //will eraser the cmdRecovery.recovery system("reboot"); return 0; }
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