Contents of /tags/mkinitrd-6_1_5/busybox/coreutils/logname.c
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Wed Aug 5 17:52:52 2009 UTC (15 years, 1 month ago) by niro
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Wed Aug 5 17:52:52 2009 UTC (15 years, 1 month ago) by niro
File MIME type: text/plain
File size: 1215 byte(s)
tagged 'mkinitrd-6_1_5'
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 tarball for details. |
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 | #include "libbb.h" |
24 | |
25 | /* This is a NOFORK applet. Be very careful! */ |
26 | |
27 | int logname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
28 | int logname_main(int argc, char **argv UNUSED_PARAM) |
29 | { |
30 | char buf[128]; |
31 | |
32 | if (argc > 1) { |
33 | bb_show_usage(); |
34 | } |
35 | |
36 | /* Using _r function - avoid pulling in static buffer from libc */ |
37 | if (getlogin_r(buf, sizeof(buf)) == 0) { |
38 | puts(buf); |
39 | return fflush(stdout); |
40 | } |
41 | |
42 | bb_perror_msg_and_die("getlogin"); |
43 | } |