| /* 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 source tree. |
| */ |
| |
| /* 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 UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| char buf[64]; |
| |
| if (argv[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"); |
| } |