[821] | 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 | *
|
---|
[2725] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
[821] | 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 |
|
---|
[3232] | 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 |
|
---|
[1765] | 32 | #include "libbb.h"
|
---|
[821] | 33 |
|
---|
[1765] | 34 | /* This is a NOFORK applet. Be very careful! */
|
---|
| 35 |
|
---|
[2725] | 36 | int logname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 37 | int logname_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
|
---|
[821] | 38 | {
|
---|
[2725] | 39 | char buf[64];
|
---|
[821] | 40 |
|
---|
[2725] | 41 | if (argv[1]) {
|
---|
[821] | 42 | bb_show_usage();
|
---|
| 43 | }
|
---|
| 44 |
|
---|
[1765] | 45 | /* Using _r function - avoid pulling in static buffer from libc */
|
---|
| 46 | if (getlogin_r(buf, sizeof(buf)) == 0) {
|
---|
| 47 | puts(buf);
|
---|
[2725] | 48 | return fflush_all();
|
---|
[821] | 49 | }
|
---|
| 50 |
|
---|
| 51 | bb_perror_msg_and_die("getlogin");
|
---|
| 52 | }
|
---|