1 /* mknod -- make special files
2 Copyright (C) 90, 91, 1995-2001 Free Software Foundation, Inc.
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)
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.
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. */
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)
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
28 David MacKenzie <djm@ai.mit.edu> */
33 #include <sys/types.h>
37 #include "modechange.h"
41 /* The official name of this program (e.g., no `g' prefix). */
42 #define PROGRAM_NAME "mknod"
44 #define AUTHORS "David MacKenzie"
46 /* The name this program was run with. */
49 static struct option const longopts[] =
51 {"mode", required_argument, NULL, 'm'},
52 {GETOPT_HELP_OPTION_DECL},
53 {GETOPT_VERSION_OPTION_DECL},
61 fprintf (stderr, _("Try `%s --help' for more information.\n"),
65 printf (_("Usage: %s [OPTION]... NAME TYPE [MAJOR MINOR]\n"), program_name);
67 Create the special file NAME of the given TYPE.\n\
69 -m, --mode=MODE set permission mode (as in chmod), not a=rw - umask\n\
70 --help display this help and exit\n\
71 --version output version information and exit\n\
73 MAJOR MINOR are forbidden for TYPE p, mandatory otherwise. TYPE may be:\n\
75 b create a block (buffered) special file\n\
76 c, u create a character (unbuffered) special file\n\
79 puts (_("\nReport bugs to <bug-fileutils@gnu.org>."));
85 main (int argc, char **argv)
88 struct mode_change *change;
89 const char *specified_mode;
93 program_name = argv[0];
94 setlocale (LC_ALL, "");
95 bindtextdomain (PACKAGE, LOCALEDIR);
98 atexit (close_stdout);
100 specified_mode = NULL;
102 while ((optc = getopt_long (argc, argv, "m:", longopts, NULL)) != -1)
109 specified_mode = optarg;
111 case_GETOPT_HELP_CHAR;
112 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
118 newmode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
121 newmode &= ~ umask (0);
122 change = mode_compile (specified_mode, 0);
123 if (change == MODE_INVALID)
124 error (1, 0, _("invalid mode"));
125 else if (change == MODE_MEMORY_EXHAUSTED)
127 newmode = mode_adjust (newmode, change);
130 if (argc - optind != 2 && argc - optind != 4)
133 if (argc - optind < 2)
134 msg = _("too few arguments");
135 else if (argc - optind > 4)
136 msg = _("too many arguments");
138 msg = _("wrong number of arguments");
139 error (0, 0, "%s", msg);
143 /* Only check the first character, to allow mnemonic usage like
144 `mknod /dev/rst0 character 18 0'. */
146 switch (argv[optind + 1][0])
148 case 'b': /* `block' or `buffered' */
150 error (4, 0, _("block special files not supported"));
154 goto block_or_character;
156 case 'c': /* `character' */
157 case 'u': /* `unbuffered' */
159 error (4, 0, _("character special files not supported"));
163 goto block_or_character;
166 if (argc - optind != 4)
169 when creating special files, major and minor device\n\
170 numbers must be specified"));
175 char const *s_major = argv[optind + 2];
176 char const *s_minor = argv[optind + 3];
177 uintmax_t i_major, i_minor;
180 if (xstrtoumax (s_major, NULL, 0, &i_major, NULL) != LONGINT_OK
181 || i_major != (major_t) i_major)
182 error (1, 0, _("invalid major device number %s"), quote (s_major));
184 if (xstrtoumax (s_minor, NULL, 0, &i_minor, NULL) != LONGINT_OK
185 || i_minor != (minor_t) i_minor)
186 error (1, 0, _("invalid minor device number %s"), quote (s_minor));
188 device = makedev (i_major, i_minor);
191 error (1, 0, _("invalid device %s %s"), s_major, s_minor);
194 if (mknod (argv[optind], newmode | node_type, device) != 0)
195 error (1, errno, "%s", quote (argv[optind]));
199 case 'p': /* `pipe' */
201 error (4, 0, _("fifo files not supported"));
203 if (argc - optind != 2)
206 major and minor device numbers may not be specified for fifo files"));
209 if (mkfifo (argv[optind], newmode))
210 error (1, errno, "%s", quote (argv[optind]));
215 error (0, 0, "invalid device type %s", quote (argv[optind + 1]));
219 /* Perform an explicit chmod to ensure the file mode permission bits
220 are set as specified. This extra step is necessary in some cases
221 when the containing directory has a default ACL. */
225 if (chmod (argv[optind], newmode))
226 error (0, errno, _("cannot set permissions of %s"),
227 quote (argv[optind]));