src/mknod.c

   1 /* mknod -- make special files
   2    Copyright (C) 90, 91, 95, 96, 1997 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 Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 "error.h"
  38 #include "xstrtol.h"
  39
  40 /* The name this program was run with. */
  41 char *program_name;
  42
  43 /* If nonzero, display usage information and exit.  */
  44 static int show_help;
  45
  46 /* If nonzero, print the version on standard output and exit.  */
  47 static int show_version;
  48
  49 static struct option const longopts[] =
  50 {
  51   {"mode", required_argument, NULL, 'm'},
  52   {"help", no_argument, &show_help, 1},
  53   {"version", no_argument, &show_version, 1},
  54   {NULL, 0, NULL, 0}
  55 };
  56
  57 static void
  58 usage (int status)
  59 {
  60   if (status != 0)
  61     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  62              program_name);
  63   else
  64     {
  65       printf (_("Usage: %s [OPTION]... NAME TYPE [MAJOR MINOR]\n"), program_name);
  66       printf (_("\
  67 Create the special file NAME of the given TYPE.\n\
  68 \n\
  69   -m, --mode=MODE   set permission mode (as in chmod), not 0666 - umask\n\
  70       --help        display this help and exit\n\
  71       --version     output version information and exit\n\
  72 \n\
  73 MAJOR MINOR are forbidden for TYPE p, mandatory otherwise.  TYPE may be:\n\
  74 \n\
  75   b      create a block (buffered) special file\n\
  76   c, u   create a character (unbuffered) special file\n\
  77   p      create a FIFO\n\
  78 "));
  79       puts (_("\nReport bugs to <fileutils-bugs@gnu.ai.mit.edu>."));
  80     }
  81   exit (status);
  82 }
  83
  84 int
  85 main (int argc, char **argv)
  86 {
  87   unsigned short newmode;
  88   struct mode_change *change;
  89   char *symbolic_mode;
  90   int optc;
  91   int i_major, i_minor;
  92   long int tmp_major, tmp_minor;
  93   char *s;
  94
  95   program_name = argv[0];
  96   setlocale (LC_ALL, "");
  97   bindtextdomain (PACKAGE, LOCALEDIR);
  98   textdomain (PACKAGE);
  99
 100   symbolic_mode = NULL;
 101
 102   while ((optc = getopt_long (argc, argv, "m:", longopts, NULL)) != -1)
 103     {
 104       switch (optc)
 105         {
 106         case 0:
 107           break;
 108         case 'm':
 109           symbolic_mode = optarg;
 110           break;
 111         default:
 112           usage (1);
 113         }
 114     }
 115
 116   if (show_version)
 117     {
 118       printf ("mknod (%s) %s\n", GNU_PACKAGE, VERSION);
 119       exit (0);
 120     }
 121
 122   if (show_help)
 123     usage (0);
 124
 125   newmode = 0666 & ~umask (0);
 126   if (symbolic_mode)
 127     {
 128       change = mode_compile (symbolic_mode, 0);
 129       if (change == MODE_INVALID)
 130         error (1, 0, _("invalid mode"));
 131       else if (change == MODE_MEMORY_EXHAUSTED)
 132         error (1, 0, _("virtual memory exhausted"));
 133       newmode = mode_adjust (newmode, change);
 134     }
 135
 136   if (argc - optind != 2 && argc - optind != 4)
 137     {
 138       const char *msg;
 139       if (argc - optind < 2)
 140         msg = _("too few arguments");
 141       else if (argc - optind > 4)
 142         msg = _("too many arguments");
 143       else
 144         msg = _("wrong number of arguments");
 145       error (0, 0, msg);
 146       usage (1);
 147     }
 148
 149   /* Only check the first character, to allow mnemonic usage like
 150      `mknod /dev/rst0 character 18 0'. */
 151
 152   switch (argv[optind + 1][0])
 153     {
 154     case 'b':                   /* `block' or `buffered' */
 155 #ifndef S_IFBLK
 156       error (4, 0, _("block special files not supported"));
 157 #else
 158       if (argc - optind != 4)
 159         {
 160           error (0, 0, _("\
 161 when creating block special files, major and minor device\n\
 162 numbers must be specified"));
 163           usage (1);
 164         }
 165
 166       s = argv[optind + 2];
 167       if (xstrtol (s, NULL, 0, &tmp_major, NULL) != LONGINT_OK)
 168         error (1, 0, _("invalid major device number `%s'"), s);
 169
 170       s = argv[optind + 3];
 171       if (xstrtol (s, NULL, 0, &tmp_minor, NULL) != LONGINT_OK)
 172         error (1, 0, _("invalid minor device number `%s'"), s);
 173
 174       i_major = (int) tmp_major;
 175       i_minor = (int) tmp_minor;
 176
 177       if (mknod (argv[optind], newmode | S_IFBLK, makedev (i_major, i_minor)))
 178         error (1, errno, "%s", argv[optind]);
 179 #endif
 180       break;
 181
 182     case 'c':                   /* `character' */
 183     case 'u':                   /* `unbuffered' */
 184 #ifndef S_IFCHR
 185       error (4, 0, _("character special files not supported"));
 186 #else
 187       if (argc - optind != 4)
 188         {
 189           error (0, 0, _("\
 190 when creating character special files, major and minor device\n\
 191 numbers must be specified"));
 192           usage (1);
 193         }
 194
 195       s = argv[optind + 2];
 196       if (xstrtol (s, NULL, 0, &tmp_major, NULL) != LONGINT_OK)
 197         error (1, 0, _("invalid major device number `%s'"), s);
 198
 199       s = argv[optind + 3];
 200       if (xstrtol (s, NULL, 0, &tmp_minor, NULL) != LONGINT_OK)
 201         error (1, 0, _("invalid minor device number `%s'"), s);
 202
 203       i_major = (int) tmp_major;
 204       i_minor = (int) tmp_minor;
 205
 206       if (mknod (argv[optind], newmode | S_IFCHR, makedev (i_major, i_minor)))
 207         error (1, errno, "%s", argv[optind]);
 208 #endif
 209       break;
 210
 211     case 'p':                   /* `pipe' */
 212 #ifndef S_ISFIFO
 213       error (4, 0, _("fifo files not supported"));
 214 #else
 215       if (argc - optind != 2)
 216         {
 217           error (0, 0, _("\
 218 major and minor device numbers may not be specified for fifo files"));
 219           usage (1);
 220         }
 221       if (mkfifo (argv[optind], newmode))
 222         error (1, errno, "%s", argv[optind]);
 223 #endif
 224       break;
 225
 226     default:
 227       usage (1);
 228     }
 229
 230   exit (0);
 231 }