dioctl.c

来自「请在解压时看说明文档 内有详细说明」· C语言 代码 · 共 70 行

/************************************************************/
/***** dioctl.c, this is a test program for upperdrv.c *****/
/************************************************************/

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <asm/io.h>

/************************************************************/
/***** define some constants used in upperdrv.c  *****/
/************************************************************/
#ifndef _UPPER_DEVICE_H
#define _UPPER_DEVICE_H
#include <linux/ioctl.h>
#define UPPER_MAJOR 117
#define UPPER_LOW2UPPER 1 // change the input string from low to upper characters
#define UPPER_UNCHAN 0     //copy the input string to the output
#define UPPER_MAGIC UPPER_MAJOR
#define UPPER_RESET _IO(UPPER_MAGIC,0)   // reset the data
#define UPPER_QUERY_NEW_MSG _IO(UPPER_MAGIC,1) // check for new message
#define UPPER_QUERY_MSG_LENGTH _IO(UPPER_MAGIC,2) // get message length
#define IOC_NEW_MSG 1
#endif

int cmd;

int main(int argc,char **argv) {
	int fd,len=0,quit=0;
	int dbg;
	if(argc<3){
		printf("usage: dioctl+device name+[cmd]:cmd=1:change from below to upper;cmd=0:not change\n");
		exit(0);}
	fd=open("/dev/upper",O_WRONLY);
	if(fd<=0) {
		printf("Error opening device for writing!\n");
		return 0;
	}
	else
		printf("open device success\n");
	while(!quit){
		sscanf(argv[2],"%d",&cmd);
		printf("cmd=%d",cmd);
		while(ioctl(fd,UPPER_QUERY_NEW_MSG))
			usleep(1000);
		if(cmd==1){
			len=ioctl(fd,UPPER_LOW2UPPER,NULL);
			printf("len=%d,check if it is 2, then ioctl(fd,UPPER_LOW2UPPER) OK!\n",len);
			quit=1;
			}
		else if(cmd==0){
			len=ioctl(fd,UPPER_UNCHAN,NULL);
			printf("len=%d,check if it is 3, then ioctl(fd,UPPER_UNCHAN) OK!\n",len);
			quit=1;
			}
		if(!len)
			return 0;
		printf("device ioctl changed!\n");
	}
	close(fd);
}