1 /*
2 * Copyright (c) 2014, The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google, Inc. nor the names of its contributors
15 * may be used to endorse or promote products derived from this
16 * software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <unistd.h>
34 #include <sys/stat.h>
35
print_usage()36 static int print_usage() {
37 fprintf(stderr, "mknod <path> [b|c|u|p] <major> <minor>\n");
38 return EXIT_FAILURE;
39 }
40
mknod_main(int argc,char ** argv)41 int mknod_main(int argc, char **argv) {
42 char *path = NULL;
43 int major = 0;
44 int minor = 0;
45 int args = 0;
46 mode_t mode = 0660;
47
48 /* Check correct argument count is 3 or 5 */
49 if (argc != 3 && argc != 5) {
50 fprintf(stderr, "Incorrect argument count\n");
51 return print_usage();
52 }
53
54 path = argv[1];
55
56 const char node_type = *argv[2];
57 switch (node_type) {
58 case 'b':
59 mode |= S_IFBLK;
60 args = 5;
61 break;
62 case 'c':
63 case 'u':
64 mode |= S_IFCHR;
65 args = 5;
66 break;
67 case 'p':
68 mode |= S_IFIFO;
69 args = 3;
70 break;
71 default:
72 fprintf(stderr, "Invalid node type '%c'\n", node_type);
73 return print_usage();
74 }
75
76 if (argc != args) {
77 if (args == 5) {
78 fprintf(stderr, "Node type '%c' requires <major> and <minor>\n", node_type);
79 } else {
80 fprintf(stderr, "Node type '%c' does not require <major> and <minor>\n", node_type);
81 }
82 return print_usage();
83 }
84
85 if (args == 5) {
86 major = atoi(argv[3]);
87 minor = atoi(argv[4]);
88 }
89
90 if (mknod(path, mode, makedev(major, minor))) {
91 perror("Unable to create node");
92 return EXIT_FAILURE;
93 }
94 return 0;
95 }
96