61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini logname implementation for busybox
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*
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* Copyright (C) 2000 Edward Betts <edward@debian.org>.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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*
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* SUSv3 specifies the string used is that returned from getlogin().
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* The previous implementation used getpwuid() for geteuid(), which
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* is _not_ the same. Erik apparently made this change almost 3 years
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* ago to avoid failing when no utmp was available. However, the
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* correct course of action wrt SUSv3 for a failing getlogin() is
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* a diagnostic message and an error return.
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*/
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//config:config LOGNAME
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//config: bool "logname (894 bytes)"
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//config: default y
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//config: help
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//config: logname is used to print the current user's login name.
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//applet:IF_LOGNAME(APPLET_NOFORK(logname, logname, BB_DIR_USR_BIN, BB_SUID_DROP, logname))
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//kbuild:lib-$(CONFIG_LOGNAME) += logname.o
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/* BB_AUDIT SUSv3 compliant */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/logname.html */
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//usage:#define logname_trivial_usage
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//usage: ""
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//usage:#define logname_full_usage "\n\n"
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//usage: "Print the name of the current user"
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//usage:
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//usage:#define logname_example_usage
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//usage: "$ logname\n"
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//usage: "root\n"
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#include "libbb.h"
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/* This is a NOFORK applet. Be very careful! */
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int logname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int logname_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
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{
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char buf[64];
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if (argv[1]) {
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bb_show_usage();
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}
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/* Using _r function - avoid pulling in static buffer from libc */
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if (getlogin_r(buf, sizeof(buf)) == 0) {
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puts(buf);
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return fflush_all();
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}
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bb_perror_msg_and_die("getlogin");
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}
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