release/src/router/busybox/coreutils/hostid.c

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