1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
/* mknod -- make special files
Copyright (C) 90, 91, 1995-2001 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Usage: mknod [-m mode] [--mode=mode] path {bcu} major minor
make a block or character device node
mknod [-m mode] [--mode=mode] path p
make a FIFO (named pipe)
Options:
-m, --mode=mode Set the mode of created nodes to MODE, which is
symbolic as in chmod and uses the umask as a point of
departure.
David MacKenzie <djm@ai.mit.edu> */
#include <config.h>
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include "system.h"
#include "error.h"
#include "modechange.h"
#include "quote.h"
#include "xstrtol.h"
/* The official name of this program (e.g., no `g' prefix). */
#define PROGRAM_NAME "mknod"
#define AUTHORS "David MacKenzie"
/* The name this program was run with. */
char *program_name;
static struct option const longopts[] =
{
{"mode", required_argument, NULL, 'm'},
{GETOPT_HELP_OPTION_DECL},
{GETOPT_VERSION_OPTION_DECL},
{NULL, 0, NULL, 0}
};
void
usage (int status)
{
if (status != 0)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("Usage: %s [OPTION]... NAME TYPE [MAJOR MINOR]\n"), program_name);
fputs (_("\
Create the special file NAME of the given TYPE.\n\
\n\
"), stdout);
fputs (_("\
Mandatory arguments to long options are mandatory for short options too.\n\
"), stdout);
fputs (_("\
-m, --mode=MODE set permission mode (as in chmod), not a=rw - umask\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
fputs (_("\
\n\
MAJOR MINOR are forbidden for TYPE p, mandatory otherwise. TYPE may be:\n\
\n\
b create a block (buffered) special file\n\
c, u create a character (unbuffered) special file\n\
p create a FIFO\n\
"), stdout);
printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
}
exit (status);
}
int
main (int argc, char **argv)
{
mode_t newmode;
struct mode_change *change;
const char *specified_mode;
int optc;
mode_t node_type;
program_name = argv[0];
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
specified_mode = NULL;
while ((optc = getopt_long (argc, argv, "m:", longopts, NULL)) != -1)
{
switch (optc)
{
case 0:
break;
case 'm':
specified_mode = optarg;
break;
case_GETOPT_HELP_CHAR;
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
default:
usage (1);
}
}
newmode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
if (specified_mode)
{
newmode &= ~ umask (0);
change = mode_compile (specified_mode, 0);
if (change == MODE_INVALID)
error (1, 0, _("invalid mode"));
else if (change == MODE_MEMORY_EXHAUSTED)
xalloc_die ();
newmode = mode_adjust (newmode, change);
}
if (argc - optind != 2 && argc - optind != 4)
{
const char *msg;
if (argc - optind < 2)
msg = _("too few arguments");
else if (argc - optind > 4)
msg = _("too many arguments");
else
msg = _("wrong number of arguments");
error (0, 0, "%s", msg);
usage (1);
}
/* Only check the first character, to allow mnemonic usage like
`mknod /dev/rst0 character 18 0'. */
switch (argv[optind + 1][0])
{
case 'b': /* `block' or `buffered' */
#ifndef S_IFBLK
error (4, 0, _("block special files not supported"));
#else
node_type = S_IFBLK;
#endif
goto block_or_character;
case 'c': /* `character' */
case 'u': /* `unbuffered' */
#ifndef S_IFCHR
error (4, 0, _("character special files not supported"));
#else
node_type = S_IFCHR;
#endif
goto block_or_character;
block_or_character:
if (argc - optind != 4)
{
error (0, 0, _("\
when creating special files, major and minor device\n\
numbers must be specified"));
usage (1);
}
{
char const *s_major = argv[optind + 2];
char const *s_minor = argv[optind + 3];
uintmax_t i_major, i_minor;
dev_t device;
if (xstrtoumax (s_major, NULL, 0, &i_major, NULL) != LONGINT_OK
|| i_major != (major_t) i_major)
error (1, 0, _("invalid major device number %s"), quote (s_major));
if (xstrtoumax (s_minor, NULL, 0, &i_minor, NULL) != LONGINT_OK
|| i_minor != (minor_t) i_minor)
error (1, 0, _("invalid minor device number %s"), quote (s_minor));
device = makedev (i_major, i_minor);
#ifdef NODEV
if (device == NODEV)
error (1, 0, _("invalid device %s %s"), s_major, s_minor);
#endif
if (mknod (argv[optind], newmode | node_type, device) != 0)
error (1, errno, "%s", quote (argv[optind]));
}
break;
case 'p': /* `pipe' */
#ifndef S_ISFIFO
error (4, 0, _("fifo files not supported"));
#else
if (argc - optind != 2)
{
error (0, 0, _("\
major and minor device numbers may not be specified for fifo files"));
usage (1);
}
if (mkfifo (argv[optind], newmode))
error (1, errno, "%s", quote (argv[optind]));
#endif
break;
default:
error (0, 0, "invalid device type %s", quote (argv[optind + 1]));
usage (1);
}
/* Perform an explicit chmod to ensure the file mode permission bits
are set as specified. This extra step is necessary in some cases
when the containing directory has a default ACL. */
if (specified_mode)
{
if (chmod (argv[optind], newmode))
error (0, errno, _("cannot set permissions of %s"),
quote (argv[optind]));
}
exit (0);
}
|
