1 /* vi: set sw=4 ts=4: */
2 /*
3 * Mini hostid 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 source tree.
8 */
9 //config:config HOSTID
10 //config: bool "hostid (286 bytes)"
11 //config: default y
12 //config: help
13 //config: hostid prints the numeric identifier (in hexadecimal) for
14 //config: the current host.
15
16 //applet:IF_HOSTID(APPLET_NOFORK(hostid, hostid, BB_DIR_USR_BIN, BB_SUID_DROP, hostid))
17
18 //kbuild:lib-$(CONFIG_HOSTID) += hostid.o
19
20 /* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
21
22 //usage:#define hostid_trivial_usage
23 //usage: ""
24 //usage:#define hostid_full_usage "\n\n"
25 //usage: "Print out a unique 32-bit identifier for the machine"
26
27 #include "libbb.h"
28
29 /* This is a NOFORK applet. Be very careful! */
30
31 int hostid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
hostid_main(int argc UNUSED_PARAM,char ** argv UNUSED_PARAM)32 int hostid_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
33 {
34 if (argv[1]) {
35 bb_show_usage();
36 }
37
38 /* POSIX says gethostid returns a "32-bit identifier" */
39 printf("%08x\n", (unsigned)(uint32_t)gethostid());
40
41 return fflush_all();
42 }
43