busybox/coreutils/logname.c
Denys Vlasenko 8131eea3dc *: introduce and use ffulsh_all()
function                                             old     new   delta
buffer_fill_and_print                                179     196     +17
fflush_all                                             -       9      +9
spawn                                                 87      92      +5
rtcwake_main                                         455     453      -2
...
alarm_intr                                            93      84      -9
readcmd                                             1072    1062     -10
bb_ask                                               345     333     -12
more_main                                            845     832     -13
flush_stdout_stderr                                   42      23     -19
xfflush_stdout                                        27       -     -27
flush_stderr                                          30       -     -30
------------------------------------------------------------------------------
(add/remove: 1/2 grow/shrink: 2/50 up/down: 31/-397)         Total: -366 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2009-11-02 14:19:51 +01:00

44 lines
1.2 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Mini logname implementation for busybox
*
* Copyright (C) 2000 Edward Betts <edward@debian.org>.
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
/* BB_AUDIT SUSv3 compliant */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/logname.html */
/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
*
* SUSv3 specifies the string used is that returned from getlogin().
* The previous implementation used getpwuid() for geteuid(), which
* is _not_ the same. Erik apparently made this change almost 3 years
* ago to avoid failing when no utmp was available. However, the
* correct course of action wrt SUSv3 for a failing getlogin() is
* a diagnostic message and an error return.
*/
#include "libbb.h"
/* This is a NOFORK applet. Be very careful! */
int logname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int logname_main(int argc, char **argv UNUSED_PARAM)
{
char buf[64];
if (argc > 1) {
bb_show_usage();
}
/* Using _r function - avoid pulling in static buffer from libc */
if (getlogin_r(buf, sizeof(buf)) == 0) {
puts(buf);
return fflush_all();
}
bb_perror_msg_and_die("getlogin");
}