/**********************
data:2010-11-21
**********************/
#include <stdio.h>
#include <utmp.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#define SHOWHOST
void show_info(struct utmp *utbufp);
void show_time(long);
int main(int argc, char *argv[])
{
struct utmp current_record;
int utmpfd;
int reclen = sizeof(current_record);
if ((utmpfd = open(UTMP_FILE, O_RDONLY)) == -1)
{
perror(UTMP_FILE);
exit(1);
}
while (read(utmpfd,¤t_record,reclen) == reclen)
show_info(¤t_record);
close(utmpfd);
return 0;
}
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(" ");
printf("%ld", utbufp->ut_pid);
printf(" ");
show_time(utbufp->ut_time);
printf(" ");
#ifdef SHOWHOST
printf("(%s)",utbufp->ut_host);
#endif
printf("/n");
}
void show_time(long timeval)
{
char *cp;
cp = ctime(&timeval);
printf("%12.12s", cp+4);
}