#include<stdio.h>
#include<fcntl.h>       // For open()
#include<unistd.h>      // For read()
#include<string.h>

int main(int charc, char * argv[])
{
int fd;
char wbuf[40];
char rbuf[40];
ssize_t rd,wr;

strcpy(wbuf,”HELLO KERNEL!!\n”);
strcpy(rbuf,””);
fd = open(argv[1], O_RDWR);
printf(“File Descp. = %d\n”,fd);

wr = write(fd, wbuf, sizeof (wbuf));
printf(“\nData in file is: \n%s\n”,wbuf);

fd = open(argv[1], O_RDWR);
printf(“File Descp. = %d\n”,fd);

rd = read(fd, rbuf, sizeof (rbuf));
printf(“\nrd = %d \n”, rd);
printf(“%s\n”, rbuf);

close(fd);
printf(“File closed”);
return 0;

}