ubase/last.c

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C
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2014-10-16 10:27:39 +00:00
/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <utmp.h>
#include <unistd.h>
#include "config.h"
#include "util.h"
void
usage(void)
{
fputs("last [user]\n", stderr);
exit(1);
}
int
main(int argc, char **argv)
{
FILE *fp;
struct utmp ut;
char *user, *file, *prog;
time_t t;
switch (argc) {
case 1:
user = NULL;
break;
case 2:
user = argv[1];
break;
default:
usage();
}
prog = basename(argv[0]);
file = (!strcmp(prog, "last")) ? WTMP_PATH : BTMP_PATH;
if ((fp = fopen(file, "r")) == NULL)
eprintf("fopen %s:", file);
while (fread(&ut, sizeof(ut), 1, fp) == 1) {
if (ut.ut_type != USER_PROCESS ||
(user && strcmp(user, ut.ut_name))) {
continue;
}
t = ut.ut_time;
printf("%-8.8s %-8.8s %-16.16s %s",
ut.ut_user, ut.ut_line, ut.ut_host, ctime(&t));
}
if (fclose(fp))
eprintf("fclose %s:", file);
return 0;
}