/*
* who1.c
*
* Created on: Dec 30, 2013
* Author: Fedora
*/

 

#include <stdio.h>
#include <utmp.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>



#define SHOWHOST

 

void showtime(long timeval){
char* cp;
cp = ctime(&timeval);

 

printf("%12.12s",cp+4);
}

 

void show_info(struct utmp* utbufp){
if(utbufp->ut_type != USER_PROCESS){
return ;
}

 

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

 

#ifdef SHOWHOST
if(utbufp->ut_host[0] != '\0'){
printf("( %s )",utbufp->ut_host);
}
#endif

 

printf("\n");
}
int main(){
struct utmp current_record;
int utmpfd;
int reclen = sizeof(current_record);

 

if((utmpfd = open(UTMP_FILE,O_RDONLY)) == -1){
perror(UTMP_FILE);

 

return 1;
}

 

while( read(utmpfd,&current_record,reclen) == reclen ){
show_info(&current_record);
}

 

close(utmpfd);

 

return 0;
}
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