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[821] | 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 tarball for details.
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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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[1765] | 23 | #include "libbb.h"
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[821] | 24 |
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[1765] | 25 | /* This is a NOFORK applet. Be very careful! */
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| 26 |
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| 27 | int logname_main(int argc, char ATTRIBUTE_UNUSED **argv);
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[821] | 28 | int logname_main(int argc, char ATTRIBUTE_UNUSED **argv)
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| 29 | {
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[1765] | 30 | char buf[128];
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[821] | 31 |
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| 32 | if (argc > 1) {
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| 33 | bb_show_usage();
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| 34 | }
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| 35 |
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[1765] | 36 | /* Using _r function - avoid pulling in static buffer from libc */
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| 37 | if (getlogin_r(buf, sizeof(buf)) == 0) {
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| 38 | puts(buf);
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| 39 | return fflush(stdout);
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[821] | 40 | }
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| 41 |
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| 42 | bb_perror_msg_and_die("getlogin");
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| 43 | }
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