help.c

   1 /* help.c -- print help and usage message.
   2  *
   3  * This program is copyright (C) 1994 Michael K. Johnson, and is free
   4  * software which is freely distributable under the terms of the
   5  * GNU General Public License version 2, included as the file COPYING in this
   6  * distribution.  It is NOT public domain software, and any
   7  * redistribution not permitted by the GNU General Public License is
   8  * expressly forbidden without prior written permission from
   9  * the author.
  10  *
  11  */
  12
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <unistd.h>
  17 #include "vlock.h"
  18
  19
  20 void print_help(int exitcode) {
  21   fprintf(stderr,
  22           "vlock: locks virtual consoles, saving your current session.\n"
  23           "Usage: vlock [options]\n"
  24           "       Where [options] are any of:\n"
  25           "-c or --current: lock only this virtual console, allowing user to\n"
  26           "       switch to other virtual consoles.\n"
  27           "-a or --all: lock all virtual consoles by preventing other users\n"
  28           "       from switching virtual consoles.\n"
  29           "-s or --disable-sysrq: disable sysrq while consoles are locked to\n"
  30           "       prevent killing vlock with SAK, requires --all.\n"
  31           "-v or --version: Print the version number of vlock and exit.\n"
  32           "-h or --help: Print this help message and exit.\n"
  33           );
  34           exit(exitcode);
  35 }