#include <stdio.h>#include <stdlib.h>#include <fcntl.h> #include <errno.h> #include <unistd.h>#include <linux/delay.h>#include <sys/ioctl.h> #define DEVICE_GPIOTEST  "/dev/gpio"  //設(shè)備節(jié)點 int main ( int argc , char * argv [ ] ){  	int fd;   	int val =-1;   	fd = open( DEVICE_GPIOTEST,O_RDONLY); //打開設(shè)備  	if( fd < 0 )  {      		perror("can not open device!!!\n");      		exit ( 1 ) ;  	}	  	while ( 1 ) {      		printf(" please Select number to run program\n");     		printf("1 : led on\n");		printf("2 : led off\n");     		scanf("%d", &val);     		if(val ==1)       		ioctl ( fd , 0 , 10 );      		else if ( val ==2 )  {        		close( fd ); 			break;     		}   	}   return 0;}