linux c 驱动编程

#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <stdio.h>
#include<linux/soundcard.h>


#define length  1 
#define rate	0x5622 
#define size  16 
#define  channels 1 

unsigned char buf[length*rate*size*channels/8];

int main(){

	int  fd ,fr;
	int status;
	int arg;
	 fd=open("/dev/dsp",O_RDWR);
	 fr=open("china.wav",O_RDWR);
	
	if(fd<0){
		perror("open of /dev/dsp failed");
		exit(1);


	}

	printf("1\n");
	arg=size;//璁剧疆姣忕鐨勬瘮鐗规暟
	status=ioctl( fd,SOUND_PCM_WRITE_BITS,&arg);
	if(status==-1){

		perror("sound_pcm_write_btts ioctl failed");
		close(fd);
		close(fr);
		exit(1);
	}
	printf("2\n");
	if(arg!=size){
		perror("unable to set sample size");
		exit(1);
	}
	arg=channels;//璁剧疆棰戦亾
	
	printf("3\n");
	status=ioctl((int)fd,SOUND_PCM_WRITE_CHANNELS,&arg);	

	if(status==-1){
		perror("sound_pcm_write_channels ioctl failed");

		exit(1);
	}

	if(arg!=channels){	
		perror("unable to set number of channels");
		exit(1);
	}

	arg=rate;//璁剧疆閲囨牱鐜�
	status=ioctl((int)fd,SOUND_PCM_WRITE_RATE,&arg);



	if(status==-1){	
		perror("sound_pcm_write_rate failed");
		exit(1);
	}

	printf("4\n");

	FILE * fdr=fdopen(fr,"r");//io鍙ユ焺鍒癷o娴佺殑杞崲
	FILE*  fdw=fdopen(fd,"w");//

	printf("5\n");
	int tag=fread(buf,sizeof(buf),1,fdr);
	

	while(!feof(fdr)){


	printf("6\n");

	status=fread(buf,sizeof(buf),1,fdr);

	if(status <0){

		printf("staus error");
		goto tt;

	}

	status=	fwrite(buf,sizeof(buf),1,fdw);	
	
//	ioctl(fd,I_FLUSH,FLUSHR);


	}
	
	tt:
	fclose(fdr);
	fclose(fdw);
	close(fd);
	close(fr);


}