The first login entry is ignored if a log file contains more than one
entries. For example:
$ utmpdump wtmp.two
Utmp dump of wtmp.two
[7] [07810] [ts/2] [username] [pts/2 ] [192.168.255.114 ] ...
[8] [07810] [ts/2] [ ] [pts/2 ] [ ] ...
$ ln -sf $(realpath wtmp.two) /var/log/wtmp
$ busybox last
USER TTY HOST LOGIN TIME
$ utmpdump wtmp.one
Utmp dump of wtmp.one
[7] [07810] [ts/2] [username] [pts/2 ] [192.168.255.114 ] ...
$ ln -sf $(realpath wtmp.one) /var/log/wtmp
$ busybox last
USER TTY HOST LOGIN TIME
username pts/2 192.168.255.114 May 14 11:12
To fix it, do not break the while loop if the offset is zero.
---
util-linux/last.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/util-linux/last.c b/util-linux/last.c
index 7530d013d..aafd01bb9 100644
--- a/util-linux/last.c
+++ b/util-linux/last.c
@@ -157,7 +157,7 @@ int last_main(int argc UNUSED_PARAM, char **argv
UNUSED_PARAM)
ut.ut_user, ut.ut_line, ut.ut_host, ctime(&t_tmp) + 4);
next:
pos -= sizeof(ut);
- if (pos <= 0)
+ if (pos < 0)
break; /* done. */
xlseek(file, pos, SEEK_SET);
}
--
2.49.0
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