src/mknod.c

   1 /* mknod -- make special files
   2    Copyright (C) 1990, 1991 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 /* Usage: mknod [-m mode] [--mode=mode] path {bcu} major minor
  19                 make a block or character device node
  20           mknod [-m mode] [--mode=mode] path p
  21                 make a FIFO (named pipe)
  22
  23    Options:
  24    -m, --mode=mode      Set the mode of created nodes to MODE, which is
  25                         symbolic as in chmod and uses the umask as a point of
  26                         departure.
  27
  28    David MacKenzie <djm@ai.mit.edu>  */
  29
  30 #ifdef HAVE_CONFIG_H
  31 #if defined (CONFIG_BROKETS)
  32 /* We use <config.h> instead of "config.h" so that a compilation
  33    using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
  34    (which it would do because it found this file in $srcdir).  */
  35 #include <config.h>
  36 #else
  37 #include "config.h"
  38 #endif
  39 #endif
  40
  41 #include <stdio.h>
  42 #include <getopt.h>
  43 #include <sys/types.h>
  44 #include "system.h"
  45 #include "modechange.h"
  46 #include "version.h"
  47
  48 void error ();
  49
  50 static void usage ();
  51
  52 /* The name this program was run with. */
  53 char *program_name;
  54
  55 /* If non-zero, display usage information and exit.  */
  56 static int show_help;
  57
  58 /* If non-zero, print the version on standard output and exit.  */
  59 static int show_version;
  60
  61 static struct option const longopts[] =
  62 {
  63   {"mode", required_argument, NULL, 'm'},
  64   {"help", no_argument, &show_help, 1},
  65   {"version", no_argument, &show_version, 1},
  66   {NULL, 0, NULL, 0}
  67 };
  68
  69 void
  70 main (argc, argv)
  71      int argc;
  72      char **argv;
  73 {
  74   unsigned short newmode;
  75   struct mode_change *change;
  76   char *symbolic_mode;
  77   int optc;
  78
  79   program_name = argv[0];
  80   symbolic_mode = NULL;
  81
  82   while ((optc = getopt_long (argc, argv, "m:", longopts, (int *) 0)) != EOF)
  83     {
  84       switch (optc)
  85         {
  86         case 0:
  87           break;
  88         case 'm':
  89           symbolic_mode = optarg;
  90           break;
  91         default:
  92           usage ();
  93         }
  94     }
  95
  96   if (show_version)
  97     {
  98       printf ("%s\n", version_string);
  99       exit (0);
 100     }
 101
 102   if (show_help)
 103     usage ();
 104
 105   newmode = 0666 & ~umask (0);
 106   if (symbolic_mode)
 107     {
 108       change = mode_compile (symbolic_mode, 0);
 109       if (change == MODE_INVALID)
 110         error (1, 0, "invalid mode");
 111       else if (change == MODE_MEMORY_EXHAUSTED)
 112         error (1, 0, "virtual memory exhausted");
 113       newmode = mode_adjust (newmode, change);
 114     }
 115
 116   if (argc - optind != 2 && argc - optind != 4)
 117     usage ();
 118
 119   /* Only check the first character, to allow mnemonic usage like
 120      `mknod /dev/rst0 character 18 0'. */
 121
 122   switch (argv[optind + 1][0])
 123     {
 124     case 'b':                   /* `block' or `buffered' */
 125 #ifndef S_IFBLK
 126       error (4, 0, "block special files not supported");
 127 #else
 128       if (argc - optind != 4)
 129         usage ();
 130       if (mknod (argv[optind], newmode | S_IFBLK,
 131                  makedev (atoi (argv[optind + 2]), atoi (argv[optind + 3]))))
 132         error (1, errno, "%s", argv[optind]);
 133 #endif
 134       break;
 135
 136     case 'c':                   /* `character' */
 137     case 'u':                   /* `unbuffered' */
 138 #ifndef S_IFCHR
 139       error (4, 0, "character special files not supported");
 140 #else
 141       if (argc - optind != 4)
 142         usage ();
 143       if (mknod (argv[optind], newmode | S_IFCHR,
 144                  makedev (atoi (argv[optind + 2]), atoi (argv[optind + 3]))))
 145         error (1, errno, "%s", argv[optind]);
 146 #endif
 147       break;
 148
 149     case 'p':                   /* `pipe' */
 150 #ifndef S_ISFIFO
 151       error (4, 0, "fifo files not supported");
 152 #else
 153       if (argc - optind != 2)
 154         usage ();
 155       if (mkfifo (argv[optind], newmode))
 156         error (1, errno, "%s", argv[optind]);
 157 #endif
 158       break;
 159
 160     default:
 161       usage ();
 162     }
 163
 164   exit (0);
 165 }
 166
 167 static void
 168 usage ()
 169 {
 170   fprintf (stderr, "\
 171 Usage: %s [options] path {bcu} major minor\n\
 172        %s [options] path p\n\
 173 Options:\n\
 174        [-m mode] [--mode=mode] [--help] [--version]\n",
 175            program_name, program_name);
 176   exit (1);
 177 }