?? test.c
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#include <stdio.h>#include <stdlib.h>#include <fcntl.h>void showbuf(char *buf);int MAX_LEN=32;int main(){ int fd; int i,j,k; char buf[255]; for(i=0; i<MAX_LEN; i++){ buf[i]=i; } fd=open("/dev/demo",O_RDWR); if(fd < 0){ printf("####DEMO device open fail####\n"); return (-1); } printf("write %d bytes data to /dev/demo \n",MAX_LEN); showbuf(buf); write(fd,buf,MAX_LEN); printf("Read %d bytes data from /dev/demo \n",MAX_LEN); read(fd,buf,MAX_LEN); showbuf(buf); ioctl(fd,1,NULL); ioctl(fd,4,NULL); close(fd);}void showbuf(char *buf){ int i,j=0; for(i=0;i<MAX_LEN;i++){ if(i%4 ==0) printf("\n%4d: ",j++); printf("%4d ",buf[i]); } printf("\n*****************************************************\n");}?? 快捷鍵說明
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