Linux中实现30分钟无操作自动关机[Linux安全]

目前就来实践一下,写一个自动关机的小程序.该程序可以保护进程的方法运行,当用户在一按时间(比方30分钟)没有鼠标和键盘操作后就会自动关机.

这个程序操纵了上篇文章中实现的daemonize函数,为程序成立了保护进程所需求的运行环境.

由于需求同时监听鼠标和键盘操作,所以需求采取多线程的方法来实现.此中两个线程辨别监督鼠标和键盘,一旦检测到呼应行动(鼠标点击和移动、击键等),全局时间戳stamp(time_t)就会被设成当前时间.主线程每隔一按时间(比方1秒)查抄stamp,若当前时间值(time(NULL))比stamp大30*60,则履行停机操作(利用system函数履行init 0号令,大概利用reboot函数).

#include

#include

#include

#include

#include //~ O_RDWR, S_IRWXU etc.

#include

#include

#include

#include

void daemonize();

//~ thread functions

void *listen_ms(void *);

void *listen_kb(void *);

//~ time stamp, keeping the time

//~ when the last KB or Mouse event happened.

volatile time_t stamp;

//~ mutex keeping stamp consistent.

pthread_mutex_t stamp_mutex;

int

main()

{

daemonize();

//~ initialize the mutex, stamp

pthread_mutex_init(&stamp_mutex, NULL);

//time(&stamp);

stamp = time(NULL);

//~ create two threads monitoring the Mouse and Keyboard.

pthread_t ms_tid, kb_tid;

if(pthread_create(&ms_tid, NULL, listen_ms, NULL) != 0)

{

perror("pthread_create");

exit(1);

}

if(pthread_create(&kb_tid, NULL, listen_kb, NULL) != 0)

{

perror("pthread_create");

exit(1);

}

unsigned int interval = 60 * 30;

while(1)

{

sleep(1);

pthread_mutex_lock(&stamp_mutex);

if( time(NULL) - stamp >interval )

{

/*printf("shutdown\n");*/

/*fflush(stdin);*/

system("init 0");

}

pthread_mutex_unlock(&stamp_mutex);

}

//~ join the threads, though it'll never be excuted.

pthread_join(ms_tid, NULL);

pthread_join(kb_tid, NULL);

return 0;

}

void *

listen_ms(void * arg)

{

int fd = open("/dev/input/mice", O_RDONLY);

if(fd <0)

{

perror("open mice");

exit(1);

}

char buf[256];

while( read(fd, buf, sizeof(buf)) >0 )

{

/*printf("Moused Moved.\n");*/

pthread_mutex_lock(&stamp_mutex);

//time(&stamp);

stamp = time(NULL);

pthread_mutex_unlock(&stamp_mutex);

}

close(fd);

}

void *

listen_kb(void * arg)

{

int fd = open("/dev/input/event3", O_RDONLY);

if(fd <0)

{

perror("open event3");

exit(1);

}

char buf[256];

while( read(fd, buf, sizeof(buf)) >0 )

{

/*printf("Key Hit.\n");*/

pthread_mutex_lock(&stamp_mutex);

//time(&stamp);

stamp = time(NULL);

pthread_mutex_unlock(&stamp_mutex);

}

close(fd);

}

void

daemonize()

{

if( fork() >0)

exit(0);

setsid();

close(0);

close(1);

close(2);

int fd = open("/dev/null", O_RDWR);

//int fd = open("log.txt", O_RDWR);

dup2(fd, 1);

dup2(fd, 2);

chdir("/");

umask(0);

signal(SIGCHLD, SIG_IGN);

}

需求阐明的是,同享变量stamp需求互斥地拜候.别的,对鼠标事件的监听是借助于对设备文件/dev/input/mice的读取(阻塞方法),键盘的监听借助于对/dev/input/event3的非阻塞读取,但我猜想在差别机械上大概会是别的诸如event0,event5之类的文件.

不足之处在于,无法对全屏情势举行判断,便是说,假如你全屏看一部较长的片子,大概会被关机…… 　　以上是“Linux中实现30分钟无操作自动关机[Linux安全]”的内容，如果你对以上该文章内容感兴趣，你可以看看七道奇为您推荐以下文章：