ideality

#include<stdio.h>

#include<utmp.h>

#include<fcntl.h>

#include<unistd.h>

#define SHOWHOST

int main()

{

    struct utmp current_record;

    int utmpfd;

    int reclen=sizeof(current_record);

    if ((utmpfd=open(UTMP_FILE,O_RDONLY))==-1)

       {

          perror(UTMP_FILE);  /*UTMP_FILE is in utmp.h*/

          exit(1);

        }

       while(read(utmpfd,&current_record,reclen)==reclen)

           show_info(&current_record);

        close(utmpfd);

        return 0;

     }

show_info(struct utmp *utbufp)

{

      printf("%-8.8s",utbufp->ut_name);

      printf(" ");

       printf("%-8.8s",utbufp->ut_line);

       printf(" ¡°);

       printf("%10ld",utbufp->ut_time);

        printf(" ");

        # ifdef SHOWHOST

              printf("(%s)",utbutfp->ut_host);

        # endif

                printf("\n");

    }