source: branches/3.2/mindi-busybox/coreutils/logname.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 1.4 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini logname implementation for busybox
4 *
5 * Copyright (C) 2000  Edward Betts <edward@debian.org>.
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 */
9
10/* BB_AUDIT SUSv3 compliant */
11/* http://www.opengroup.org/onlinepubs/007904975/utilities/logname.html */
12
13/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
14 *
15 * SUSv3 specifies the string used is that returned from getlogin().
16 * The previous implementation used getpwuid() for geteuid(), which
17 * is _not_ the same.  Erik apparently made this change almost 3 years
18 * ago to avoid failing when no utmp was available.  However, the
19 * correct course of action wrt SUSv3 for a failing getlogin() is
20 * a diagnostic message and an error return.
21 */
22
23//usage:#define logname_trivial_usage
24//usage:       ""
25//usage:#define logname_full_usage "\n\n"
26//usage:       "Print the name of the current user"
27//usage:
28//usage:#define logname_example_usage
29//usage:       "$ logname\n"
30//usage:       "root\n"
31
32#include "libbb.h"
33
34/* This is a NOFORK applet. Be very careful! */
35
36int logname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
37int logname_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
38{
39    char buf[64];
40
41    if (argv[1]) {
42        bb_show_usage();
43    }
44
45    /* Using _r function - avoid pulling in static buffer from libc */
46    if (getlogin_r(buf, sizeof(buf)) == 0) {
47        puts(buf);
48        return fflush_all();
49    }
50
51    bb_perror_msg_and_die("getlogin");
52}
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