src/mknod.c

   1 /* mknod -- make special files
   2    Copyright (C) 90, 91, 1995-1999 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 "error.h"
  37 #include "modechange.h"
  38 #include "xstrtol.h"
  39
  40 /* The official name of this program (e.g., no `g' prefix).  */
  41 #define PROGRAM_NAME "mknod"
  42
  43 #define AUTHORS "David MacKenzie"
  44
  45 /* The name this program was run with. */
  46 char *program_name;
  47
  48 static struct option const longopts[] =
  49 {
  50   {"mode", required_argument, NULL, 'm'},
  51   {GETOPT_HELP_OPTION_DECL},
  52   {GETOPT_VERSION_OPTION_DECL},
  53   {NULL, 0, NULL, 0}
  54 };
  55
  56 void
  57 usage (int status)
  58 {
  59   if (status != 0)
  60     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  61              program_name);
  62   else
  63     {
  64       printf (_("Usage: %s [OPTION]... NAME TYPE [MAJOR MINOR]\n"), program_name);
  65       printf (_("\
  66 Create the special file NAME of the given TYPE.\n\
  67 \n\
  68   -m, --mode=MODE   set permission mode (as in chmod), not a=rw - umask\n\
  69       --help        display this help and exit\n\
  70       --version     output version information and exit\n\
  71 \n\
  72 MAJOR MINOR are forbidden for TYPE p, mandatory otherwise.  TYPE may be:\n\
  73 \n\
  74   b      create a block (buffered) special file\n\
  75   c, u   create a character (unbuffered) special file\n\
  76   p      create a FIFO\n\
  77 "));
  78       puts (_("\nReport bugs to <bug-fileutils@gnu.org>."));
  79       close_stdout ();
  80     }
  81   exit (status);
  82 }
  83
  84 int
  85 main (int argc, char **argv)
  86 {
  87   mode_t newmode;
  88   struct mode_change *change;
  89   const 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         case_GETOPT_HELP_CHAR;
 112         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 113         default:
 114           usage (1);
 115         }
 116     }
 117
 118   newmode = ((S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)
 119              & ~ umask (0));
 120   if (symbolic_mode)
 121     {
 122       change = mode_compile (symbolic_mode, 0);
 123       if (change == MODE_INVALID)
 124         error (1, 0, _("invalid mode"));
 125       else if (change == MODE_MEMORY_EXHAUSTED)
 126         error (1, 0, _("virtual memory exhausted"));
 127       newmode = mode_adjust (newmode, change);
 128     }
 129
 130   if (argc - optind != 2 && argc - optind != 4)
 131     {
 132       const char *msg;
 133       if (argc - optind < 2)
 134         msg = _("too few arguments");
 135       else if (argc - optind > 4)
 136         msg = _("too many arguments");
 137       else
 138         msg = _("wrong number of arguments");
 139       error (0, 0, msg);
 140       usage (1);
 141     }
 142
 143   /* Only check the first character, to allow mnemonic usage like
 144      `mknod /dev/rst0 character 18 0'. */
 145
 146   switch (argv[optind + 1][0])
 147     {
 148     case 'b':                   /* `block' or `buffered' */
 149 #ifndef S_IFBLK
 150       error (4, 0, _("block special files not supported"));
 151 #else
 152       if (argc - optind != 4)
 153         {
 154           error (0, 0, _("\
 155 when creating block special files, major and minor device\n\
 156 numbers must be specified"));
 157           usage (1);
 158         }
 159
 160       s = argv[optind + 2];
 161       if (xstrtol (s, NULL, 0, &tmp_major, NULL) != LONGINT_OK)
 162         error (1, 0, _("invalid major device number `%s'"), s);
 163
 164       s = argv[optind + 3];
 165       if (xstrtol (s, NULL, 0, &tmp_minor, NULL) != LONGINT_OK)
 166         error (1, 0, _("invalid minor device number `%s'"), s);
 167
 168       i_major = (int) tmp_major;
 169       i_minor = (int) tmp_minor;
 170
 171       if (mknod (argv[optind], newmode | S_IFBLK, makedev (i_major, i_minor)))
 172         error (1, errno, "%s", argv[optind]);
 173 #endif
 174       break;
 175
 176     case 'c':                   /* `character' */
 177     case 'u':                   /* `unbuffered' */
 178 #ifndef S_IFCHR
 179       error (4, 0, _("character special files not supported"));
 180 #else
 181       if (argc - optind != 4)
 182         {
 183           error (0, 0, _("\
 184 when creating character special files, major and minor device\n\
 185 numbers must be specified"));
 186           usage (1);
 187         }
 188
 189       s = argv[optind + 2];
 190       if (xstrtol (s, NULL, 0, &tmp_major, NULL) != LONGINT_OK)
 191         error (1, 0, _("invalid major device number `%s'"), s);
 192
 193       s = argv[optind + 3];
 194       if (xstrtol (s, NULL, 0, &tmp_minor, NULL) != LONGINT_OK)
 195         error (1, 0, _("invalid minor device number `%s'"), s);
 196
 197       i_major = (int) tmp_major;
 198       i_minor = (int) tmp_minor;
 199
 200       if (mknod (argv[optind], newmode | S_IFCHR, makedev (i_major, i_minor)))
 201         error (1, errno, "%s", argv[optind]);
 202 #endif
 203       break;
 204
 205     case 'p':                   /* `pipe' */
 206 #ifndef S_ISFIFO
 207       error (4, 0, _("fifo files not supported"));
 208 #else
 209       if (argc - optind != 2)
 210         {
 211           error (0, 0, _("\
 212 major and minor device numbers may not be specified for fifo files"));
 213           usage (1);
 214         }
 215       if (mkfifo (argv[optind], newmode))
 216         error (1, errno, "%s", argv[optind]);
 217 #endif
 218       break;
 219
 220     default:
 221       usage (1);
 222     }
 223
 224   exit (0);
 225 }