1 /*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source. A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12 /*
13 * Copyright 2019 Robert Mustacchi
14 */
15
16 #include <unistd.h>
17 #include <err.h>
18 #include <sys/types.h>
19 #include <unistd.h>
20 #include <stdlib.h>
21 #include <pwd.h>
22 #include <libgen.h>
23 #include <locale.h>
24 #include <libintl.h>
25
26 int
main(int argc,char * argv[])27 main(int argc, char *argv[])
28 {
29 char *name;
30 char uidbuf[32];
31
32 (void) setlocale(LC_ALL, "");
33 #if !defined(TEXT_DOMAIN)
34 #define TEXT_DOMAIN "SYS_TEST"
35 #endif
36 (void) textdomain(TEXT_DOMAIN);
37
38 if (argc != 1) {
39 warnx(gettext("illegal arguments"));
40 (void) fprintf(stderr, gettext("Usage: %s\n"),
41 basename(argv[0]));
42 return (1);
43 }
44
45 /*
46 * In some cases getlogin() can fail. The most common case is due to
47 * something like using script(1). Deal with that by falling back to the
48 * current user ID, which is as accurate as we can be. This is what the
49 * ksh93 version used to do.
50 */
51 name = getlogin();
52 if (name == NULL) {
53 uid_t uid;
54 struct passwd *pass;
55
56 uid = getuid();
57 pass = getpwuid(uid);
58 if (pass != NULL) {
59 name = pass->pw_name;
60 } else {
61 (void) snprintf(uidbuf, sizeof (uidbuf), "%u", uid);
62 name = uidbuf;
63 }
64 }
65
66 if (printf("%s\n", name) == -1) {
67 err(EXIT_FAILURE, gettext("failed to write out login name"));
68 }
69
70 return (0);
71 }
72