1 /* mknod -- make special files
2 Copyright (C) 90, 91, 1995-1999 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"
40 /* The official name of this program (e.g., no `g' prefix). */
41 #define PROGRAM_NAME "mknod"
43 #define AUTHORS "David MacKenzie"
45 /* The name this program was run with. */
48 static struct option const longopts[] =
50 {"mode", required_argument, NULL, 'm'},
51 {GETOPT_HELP_OPTION_DECL},
52 {GETOPT_VERSION_OPTION_DECL},
60 fprintf (stderr, _("Try `%s --help' for more information.\n"),
64 printf (_("Usage: %s [OPTION]... NAME TYPE [MAJOR MINOR]\n"), program_name);
66 Create the special file NAME of the given TYPE.\n\
68 -m, --mode=MODE set permission mode (as in chmod), not 0666 - umask\n\
69 --help display this help and exit\n\
70 --version output version information and exit\n\
72 MAJOR MINOR are forbidden for TYPE p, mandatory otherwise. TYPE may be:\n\
74 b create a block (buffered) special file\n\
75 c, u create a character (unbuffered) special file\n\
78 puts (_("\nReport bugs to <bug-fileutils@gnu.org>."));
85 main (int argc, char **argv)
87 unsigned short newmode;
88 struct mode_change *change;
92 long int tmp_major, tmp_minor;
95 program_name = argv[0];
96 setlocale (LC_ALL, "");
97 bindtextdomain (PACKAGE, LOCALEDIR);
100 symbolic_mode = NULL;
102 while ((optc = getopt_long (argc, argv, "m:", longopts, NULL)) != -1)
109 symbolic_mode = optarg;
111 case_GETOPT_HELP_CHAR;
112 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
118 newmode = 0666 & ~umask (0);
121 change = mode_compile (symbolic_mode, 0);
122 if (change == MODE_INVALID)
123 error (1, 0, _("invalid mode"));
124 else if (change == MODE_MEMORY_EXHAUSTED)
125 error (1, 0, _("virtual memory exhausted"));
126 newmode = mode_adjust (newmode, change);
129 if (argc - optind != 2 && argc - optind != 4)
132 if (argc - optind < 2)
133 msg = _("too few arguments");
134 else if (argc - optind > 4)
135 msg = _("too many arguments");
137 msg = _("wrong number of arguments");
142 /* Only check the first character, to allow mnemonic usage like
143 `mknod /dev/rst0 character 18 0'. */
145 switch (argv[optind + 1][0])
147 case 'b': /* `block' or `buffered' */
149 error (4, 0, _("block special files not supported"));
151 if (argc - optind != 4)
154 when creating block special files, major and minor device\n\
155 numbers must be specified"));
159 s = argv[optind + 2];
160 if (xstrtol (s, NULL, 0, &tmp_major, NULL) != LONGINT_OK)
161 error (1, 0, _("invalid major device number `%s'"), s);
163 s = argv[optind + 3];
164 if (xstrtol (s, NULL, 0, &tmp_minor, NULL) != LONGINT_OK)
165 error (1, 0, _("invalid minor device number `%s'"), s);
167 i_major = (int) tmp_major;
168 i_minor = (int) tmp_minor;
170 if (mknod (argv[optind], newmode | S_IFBLK, makedev (i_major, i_minor)))
171 error (1, errno, "%s", argv[optind]);
175 case 'c': /* `character' */
176 case 'u': /* `unbuffered' */
178 error (4, 0, _("character special files not supported"));
180 if (argc - optind != 4)
183 when creating character special files, major and minor device\n\
184 numbers must be specified"));
188 s = argv[optind + 2];
189 if (xstrtol (s, NULL, 0, &tmp_major, NULL) != LONGINT_OK)
190 error (1, 0, _("invalid major device number `%s'"), s);
192 s = argv[optind + 3];
193 if (xstrtol (s, NULL, 0, &tmp_minor, NULL) != LONGINT_OK)
194 error (1, 0, _("invalid minor device number `%s'"), s);
196 i_major = (int) tmp_major;
197 i_minor = (int) tmp_minor;
199 if (mknod (argv[optind], newmode | S_IFCHR, makedev (i_major, i_minor)))
200 error (1, errno, "%s", argv[optind]);
204 case 'p': /* `pipe' */
206 error (4, 0, _("fifo files not supported"));
208 if (argc - optind != 2)
211 major and minor device numbers may not be specified for fifo files"));
214 if (mkfifo (argv[optind], newmode))
215 error (1, errno, "%s", argv[optind]);