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 "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   exit (status);
  80 }
  81
  82 void
  83 main (int argc, char **argv)
  84 {
  85   unsigned short newmode;
  86   struct mode_change *change;
  87   char *symbolic_mode;
  88   int optc;
  89   int i_major, i_minor;
  90   long int tmp_major, tmp_minor;
  91   char *s;
  92
  93   program_name = argv[0];
  94   setlocale (LC_ALL, "");
  95   bindtextdomain (PACKAGE, LOCALEDIR);
  96   textdomain (PACKAGE);
  97
  98   symbolic_mode = NULL;
  99
 100   while ((optc = getopt_long (argc, argv, "m:", longopts, (int *) 0)) != EOF)
 101     {
 102       switch (optc)
 103         {
 104         case 0:
 105           break;
 106         case 'm':
 107           symbolic_mode = optarg;
 108           break;
 109         default:
 110           usage (1);
 111         }
 112     }
 113
 114   if (show_version)
 115     {
 116       printf ("mknod - %s\n", PACKAGE_VERSION);
 117       exit (0);
 118     }
 119
 120   if (show_help)
 121     usage (0);
 122
 123   newmode = 0666 & ~umask (0);
 124   if (symbolic_mode)
 125     {
 126       change = mode_compile (symbolic_mode, 0);
 127       if (change == MODE_INVALID)
 128         error (1, 0, _("invalid mode"));
 129       else if (change == MODE_MEMORY_EXHAUSTED)
 130         error (1, 0, _("virtual memory exhausted"));
 131       newmode = mode_adjust (newmode, change);
 132     }
 133
 134   if (argc - optind != 2 && argc - optind != 4)
 135     {
 136       const char *msg;
 137       if (argc - optind < 2)
 138         msg = _("too few arguments");
 139       else if (argc - optind > 4)
 140         msg = _("too many arguments");
 141       else
 142         msg = _("wrong number of arguments");
 143       error (0, 0, msg);
 144       usage (1);
 145     }
 146
 147   /* Only check the first character, to allow mnemonic usage like
 148      `mknod /dev/rst0 character 18 0'. */
 149
 150   switch (argv[optind + 1][0])
 151     {
 152     case 'b':                   /* `block' or `buffered' */
 153 #ifndef S_IFBLK
 154       error (4, 0, _("block special files not supported"));
 155 #else
 156       if (argc - optind != 4)
 157         {
 158           error (0, 0, _("\
 159 when creating block special files, major and minor device\n\
 160 numbers must be specified"));
 161           usage (1);
 162         }
 163
 164       s = argv[optind + 2];
 165       if (xstrtol (s, NULL, 0, &tmp_major, NULL) != LONGINT_OK)
 166         error (1, 0, _("invalid major device number `%s'"), s);
 167
 168       s = argv[optind + 3];
 169       if (xstrtol (s, NULL, 0, &tmp_minor, NULL) != LONGINT_OK)
 170         error (1, 0, _("invalid minor device number `%s'"), s);
 171
 172       i_major = (int) tmp_major;
 173       i_minor = (int) tmp_minor;
 174
 175       if (mknod (argv[optind], newmode | S_IFBLK, makedev (i_major, i_minor)))
 176         error (1, errno, "%s", argv[optind]);
 177 #endif
 178       break;
 179
 180     case 'c':                   /* `character' */
 181     case 'u':                   /* `unbuffered' */
 182 #ifndef S_IFCHR
 183       error (4, 0, _("character special files not supported"));
 184 #else
 185       if (argc - optind != 4)
 186         {
 187           error (0, 0, _("\
 188 when creating character special files, major and minor device\n\
 189 numbers must be specified"));
 190           usage (1);
 191         }
 192
 193       s = argv[optind + 2];
 194       if (xstrtol (s, NULL, 0, &tmp_major, NULL) != LONGINT_OK)
 195         error (1, 0, _("invalid major device number `%s'"), s);
 196
 197       s = argv[optind + 3];
 198       if (xstrtol (s, NULL, 0, &tmp_minor, NULL) != LONGINT_OK)
 199         error (1, 0, _("invalid minor device number `%s'"), s);
 200
 201       i_major = (int) tmp_major;
 202       i_minor = (int) tmp_minor;
 203
 204       if (mknod (argv[optind], newmode | S_IFCHR, makedev (i_major, i_minor)))
 205         error (1, errno, "%s", argv[optind]);
 206 #endif
 207       break;
 208
 209     case 'p':                   /* `pipe' */
 210 #ifndef S_ISFIFO
 211       error (4, 0, _("fifo files not supported"));
 212 #else
 213       if (argc - optind != 2)
 214         {
 215           error (0, 0, _("\
 216 major and minor device numbers may not be specified for fifo files"));
 217           usage (1);
 218         }
 219       if (mkfifo (argv[optind], newmode))
 220         error (1, errno, "%s", argv[optind]);
 221 #endif
 222       break;
 223
 224     default:
 225       usage (1);
 226     }
 227
 228   exit (0);
 229 }