LXR 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//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
  31int hostid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  32int 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