#include	<stdio.h>
#include	<sys/types.h>
#include	<utmp.h>
#include	<fcntl.h>

/*
 *	who version 1		- read /etc/utmp and list info therein
 */

#define	INFOFILE	"/var/adm/utmp"
/* #define	SHOWHOST */

main(int ac, char **av)
{
	struct utmp	utbuf;		/* read info into here */
	int		utmpfd;		/* read from this descriptor */

	if ( (utmpfd = open( INFOFILE, O_RDONLY )) == -1 ){
		fprintf(stderr,"%s: cannot open %s\n", *av, INFOFILE);
		exit(1);
	}

	while ( read( utmpfd, &utbuf, sizeof(utbuf) ) == sizeof(utbuf) )
		show_info( &utbuf );
	close( utmpfd );
	return 0;			/* went ok			*/
}
/*
 *	show info()
 *			displays the contents of the utmp struct
 *			in human readable form
 *			*note* these sizes should not be hardwired
 */
show_info( struct utmp *utbufp )
{
	printf("%-8.8s", utbufp->ut_name);		/* the logname	*/
	printf(" ");					/* a space	*/
	printf("%-8.8s", utbufp->ut_line);		/* the tty	*/
	printf(" ");					/* a space	*/
	printf("%10ld", utbufp->ut_time);		/* login time	*/
	printf(" ");					/* a space	*/
#ifdef	SHOWHOST
	printf("(%s)", utbufp->ut_host);		/* the host	*/
#endif
	printf("\n");					/* newline	*/
}