last.c - ubase - suckless linux base utils | |
git clone git://git.suckless.org/ubase | |
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last.c (1085B) | |
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1 /* See LICENSE file for copyright and license details. */ | |
2 #include <errno.h> | |
3 #include <libgen.h> | |
4 #include <paths.h> | |
5 #include <pwd.h> | |
6 #include <stdio.h> | |
7 #include <stdlib.h> | |
8 #include <string.h> | |
9 #include <time.h> | |
10 #include <utmp.h> | |
11 #include <unistd.h> | |
12 | |
13 #include "config.h" | |
14 #include "util.h" | |
15 | |
16 static void | |
17 usage(void) | |
18 { | |
19 eprintf("usage: %s [user]\n", argv0); | |
20 } | |
21 | |
22 int | |
23 main(int argc, char **argv) | |
24 { | |
25 FILE *fp; | |
26 struct utmp ut; | |
27 char *user, *file, *prog; | |
28 time_t t; | |
29 | |
30 ARGBEGIN { | |
31 default: | |
32 usage(); | |
33 } ARGEND; | |
34 | |
35 switch (argc) { | |
36 case 0: | |
37 user = NULL; | |
38 break; | |
39 case 1: | |
40 user = argv[0]; | |
41 break; | |
42 default: | |
43 usage(); | |
44 } | |
45 | |
46 prog = basename(argv0); | |
47 file = (!strcmp(prog, "last")) ? WTMP_PATH : BTMP_PATH; | |
48 if ((fp = fopen(file, "r")) == NULL) | |
49 eprintf("fopen %s:", file); | |
50 | |
51 while (fread(&ut, sizeof(ut), 1, fp) == 1) { | |
52 if (ut.ut_type != USER_PROCESS || | |
53 (user && strcmp(user, ut.ut_name))) { | |
54 continue; | |
55 } | |
56 | |
57 t = ut.ut_time; | |
58 printf("%-8.8s %-8.8s %-16.16s %s", | |
59 ut.ut_user, ut.ut_line, ut.ut_host, ctime(&t)); | |
60 } | |
61 if (fclose(fp)) | |
62 eprintf("fclose %s:", file); | |
63 return 0; | |
64 } |