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