键盘中断输入测试程序

今天测试需要写一个接收键盘键的中断输入就停止，再按就继续，亲测有效，程序如下：
#include <stdio.h>
#include “conio.h”
#include <termios.h>
#include <unistd.h>
#include <fcntl.h>

int kbhit(void)
{
struct termios oldt, newt;
int ch;
int oldf;
tcgetattr(STDIN_FILENO, &oldt);
newt = oldt;
newt.c_lflag &= ~(ICANON | ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &newt);
oldf = fcntl(STDIN_FILENO, F_GETFL, 0);
fcntl(STDIN_FILENO, F_SETFL, oldf | O_NONBLOCK);
ch = getchar();
tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
fcntl(STDIN_FILENO, F_SETFL, oldf);
if(ch != EOF)
{
ungetc(ch, stdin);
return 1;
}
return 0;
}

int main()
{
char i;int y=0;
while(1)
{
if(!(kbhit()))
{
y=0;
printf(“key is not pressed\n”);
//do something
}
else
{
printf(“key pressed , press again to resume\n”);
i=getch();
y=1;
}
if(y==1)
{
getch();
}
}
return 0;
}

上面程序需要注意的的是kbhit（）非linux标准库函数，需要加头文件conio.h，这个头文件需要下载，下面把这个头文件内容贴出来：
#include <termios.h>
#include <stdio.h>

static struct termios old, new;

/* Initialize new terminal i/o settings /
void initTermios(int echo)
{
tcgetattr(0, &old); / grab old terminal i/o settings /
new = old; / make new settings same as old settings /
new.c_lflag &= ~ICANON; / disable buffered i/o /
new.c_lflag &= echo ? ECHO : ~ECHO; / set echo mode /
tcsetattr(0, TCSANOW, &new); / use these new terminal i/o settings now */
}

/* Restore old terminal i/o settings */
void resetTermios(void)
{
tcsetattr(0, TCSANOW, &old);
}

/* Read 1 character - echo defines echo mode */
char getch_(int echo)
{
char ch;
initTermios(echo);
ch = getchar();
resetTermios();
return ch;
}

/* Read 1 character without echo */
char getch(void)
{
return getch_(0);
}

/* Read 1 character with echo */
char getche(void)
{
return getch_(1);
}

/* Let’s test it out */

把这个头文件放到linux 如ubuntu下/usr/include/下即可；

Ubuntu下编译：
gcc -o test test.c

执行：
key is not pressed
key is not pressed
key is not pressed
key is not pressed
key is not pressed
key is not pressed
key pressed (execution pause) , press again to resume
按下键盘即可接收停止和继续