src/mknod.c

   1 /* mknod -- make special files
   2    Copyright (C) 1990, 1991, 1995 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 #include <config.h>
  31 #include <stdio.h>
  32 #include <getopt.h>
  33 #include <sys/types.h>
  34
  35 #include "system.h"
  36 #include "modechange.h"
  37 #include "version.h"
  38 #include "error.h"
  39 #include "xstrtol.h"
  40
  41 /* The name this program was run with. */
  42 char *program_name;
  43
  44 /* If nonzero, display usage information and exit.  */
  45 static int show_help;
  46
  47 /* If nonzero, print the version on standard output and exit.  */
  48 static int show_version;
  49
  50 static struct option const longopts[] =
  51 {
  52   {"mode", required_argument, NULL, 'm'},
  53   {"help", no_argument, &show_help, 1},
  54   {"version", no_argument, &show_version, 1},
  55   {NULL, 0, NULL, 0}
  56 };
  57
  58 static void
  59 usage (int status)
  60 {
  61   if (status != 0)
  62     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  63              program_name);
  64   else
  65     {
  66       printf (_("Usage: %s [OPTION]... NAME TYPE [MAJOR MINOR]\n"), program_name);
  67       printf (_("\
  68 Create the special file NAME of the given TYPE.\n\
  69 \n\
  70   -m, --mode=MODE   set permission mode (as in chmod), not 0666 - umask\n\
  71       --help        display this help and exit\n\
  72       --version     output version information and exit\n\
  73 \n\
  74 MAJOR MINOR are forbidden for TYPE p, mandatory otherwise.  TYPE may be:\n\
  75 \n\
  76   b      create a block (buffered) special file\n\
  77   c, u   create a character (unbuffered) special file   \n\
  78   p      create a FIFO\n"));
  79     }
  80   exit (status);
  81 }
  82
  83 void
  84 main (int argc, char **argv)
  85 {
  86   unsigned short newmode;
  87   struct mode_change *change;
  88   char *symbolic_mode;
  89   int optc;
  90   int i_major, i_minor;
  91   long int tmp_major, tmp_minor;
  92   char *s;
  93
  94   program_name = argv[0];
  95   setlocale (LC_ALL, "");
  96   bindtextdomain (PACKAGE, LOCALEDIR);
  97   textdomain (PACKAGE);
  98
  99   symbolic_mode = NULL;
 100
 101   while ((optc = getopt_long (argc, argv, "m:", longopts, (int *) 0)) != EOF)
 102     {
 103       switch (optc)
 104         {
 105         case 0:
 106           break;
 107         case 'm':
 108           symbolic_mode = optarg;
 109           break;
 110         default:
 111           usage (1);
 112         }
 113     }
 114
 115   if (show_version)
 116     {
 117       printf ("mknod - %s\n", version_string);
 118       exit (0);
 119     }
 120
 121   if (show_help)
 122     usage (0);
 123
 124   newmode = 0666 & ~umask (0);
 125   if (symbolic_mode)
 126     {
 127       change = mode_compile (symbolic_mode, 0);
 128       if (change == MODE_INVALID)
 129         error (1, 0, _("invalid mode"));
 130       else if (change == MODE_MEMORY_EXHAUSTED)
 131         error (1, 0, _("virtual memory exhausted"));
 132       newmode = mode_adjust (newmode, change);
 133     }
 134
 135   if (argc - optind != 2 && argc - optind != 4)
 136     {
 137       const char *msg;
 138       if (argc - optind < 2)
 139         msg = _("too few arguments");
 140       else if (argc - optind > 4)
 141         msg = _("too many arguments");
 142       else
 143         msg = _("wrong number of arguments");
 144       error (0, 0, msg);
 145       usage (1);
 146     }
 147
 148   /* Only check the first character, to allow mnemonic usage like
 149      `mknod /dev/rst0 character 18 0'. */
 150
 151   switch (argv[optind + 1][0])
 152     {
 153     case 'b':                   /* `block' or `buffered' */
 154 #ifndef S_IFBLK
 155       error (4, 0, _("block special files not supported"));
 156 #else
 157       if (argc - optind != 4)
 158         {
 159           error (0, 0, _("\
 160 when creating block special files, major and minor device\n\
 161 numbers must be specified"));
 162           usage (1);
 163         }
 164
 165       s = argv[optind + 2];
 166       if (xstrtol (s, NULL, 0, &tmp_major, NULL) != LONGINT_OK)
 167         error (1, 0, _("invalid major device number `%s'"), s);
 168
 169       s = argv[optind + 3];
 170       if (xstrtol (s, NULL, 0, &tmp_minor, NULL) != LONGINT_OK)
 171         error (1, 0, _("invalid minor device number `%s'"), s);
 172
 173       i_major = (int) tmp_major;
 174       i_minor = (int) tmp_minor;
 175
 176       if (mknod (argv[optind], newmode | S_IFBLK, makedev (i_major, i_minor)))
 177         error (1, errno, "%s", argv[optind]);
 178 #endif
 179       break;
 180
 181     case 'c':                   /* `character' */
 182     case 'u':                   /* `unbuffered' */
 183 #ifndef S_IFCHR
 184       error (4, 0, _("character special files not supported"));
 185 #else
 186       if (argc - optind != 4)
 187         {
 188           error (0, 0, _("\
 189 when creating character special files, major and minor device\n\
 190 numbers must be specified"));
 191           usage (1);
 192         }
 193
 194       s = argv[optind + 2];
 195       if (xstrtol (s, NULL, 0, &tmp_major, NULL) != LONGINT_OK)
 196         error (1, 0, _("invalid major device number `%s'"), s);
 197
 198       s = argv[optind + 3];
 199       if (xstrtol (s, NULL, 0, &tmp_minor, NULL) != LONGINT_OK)
 200         error (1, 0, _("invalid minor device number `%s'"), s);
 201
 202       i_major = (int) tmp_major;
 203       i_minor = (int) tmp_minor;
 204
 205       if (mknod (argv[optind], newmode | S_IFCHR, makedev (i_major, i_minor)))
 206         error (1, errno, "%s", argv[optind]);
 207 #endif
 208       break;
 209
 210     case 'p':                   /* `pipe' */
 211 #ifndef S_ISFIFO
 212       error (4, 0, _("fifo files not supported"));
 213 #else
 214       if (argc - optind != 2)
 215         {
 216           error (0, 0, _("\
 217 major and minor device numbers may not be specified for fifo files"));
 218           usage (1);
 219         }
 220       if (mkfifo (argv[optind], newmode))
 221         error (1, errno, "%s", argv[optind]);
 222 #endif
 223       break;
 224
 225     default:
 226       usage (1);
 227     }
 228
 229   exit (0);
 230 }