SUCCESSSUCCESS!!!
imenting with file descriptors. (Not too exciting) */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

main(argc,argv)
int argc;
char *argv[];
{int fd;
 char *buf=(char *)malloc(10);
 char *bufa=(char *)malloc(10);
 if (argc!=2) {
  printf("Enter a file name!!!\n");
  exit(1);
 }
 strcpy(buf,"SUCCESS!!!");

 fd=open(argv[1],O_RDWR);
 printf("RDWR Descriptor # %d\n",fd);
 close(fd);
 fd=open(argv[1],O_RDONLY | O_APPEND);
 printf("RDONLY | APPEND Descriptor # %d\n",fd);
 close(fd);
 fd=open(argv[1],O_RDWR | O_APPEND);
 if (read(fd,bufa,10)>0) printf("Read from file: %s \n",bufa);
 else printf("Read Nothing");
 if (lseek(fd,0,SEEK_SET)== -1)
  printf("Seek Disabled\n");
 else write(fd,buf,10);
 if (read(fd,bufa,10)>0) printf("Read from file: %s \n",bufa);
 else printf("Read Nothing");
 printf("RDWR | APPEND Descriptor # %d\n",fd);
 close(fd);
}