xref: /illumos-gate/usr/src/cmd/mknod/mknod.c (revision 7c478bd9)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28 /*	  All Rights Reserved  	*/
29 
30 /*	Copyright (c) 1987, 1988 Microsoft Corporation	*/
31 /*	  All Rights Reserved	*/
32 
33 #pragma ident	"%Z%%M%	%I%	%E% SMI"	/* SVr4.0 1.9	*/
34 
35 /*
36  *	mknod - build special file
37  *
38  *	mknod  name [ b ] [ c ] major minor
39  *	mknod  name p	(named pipe)
40  *
41  *	MODIFICATION HISTORY
42  *	M000	11 Apr 83	andyp	3.0 upgrade
43  *	- (Mostly uncommented).  Picked up 3.0 source.
44  *	- Added header.  Changed usage message.  Replaced hard-coded
45  *	  makedev with one from <sys/types.h>.
46  *	- Added mechanism for creating name space files.
47  *	- Added some error checks.
48  *	- Semi-major reorganition.
49  */
50 
51 #include <sys/types.h>
52 #include <stdio.h>
53 #include <unistd.h>
54 #include <stdlib.h>
55 #include <errno.h>
56 #include <sys/stat.h>
57 #include <sys/mkdev.h>
58 
59 #define	ACC	0666
60 
61 static int domk(const char *path, const mode_t mode, const dev_t arg);
62 static long number(const char *s);
63 static void usage(void);
64 
65 int
main(int argc,char ** argv)66 main(int argc, char **argv)
67 {
68 	mode_t	mode;
69 	dev_t	arg;
70 	major_t	majno;
71 	minor_t	minno;
72 
73 	if (argc < 3 || argc > 5)
74 		usage();
75 
76 	if (argv[2][1] != '\0')
77 		usage();
78 
79 	if (argc == 3) {
80 		switch (argv[2][0]) {
81 		case 'p':
82 			mode = S_IFIFO;
83 			arg = 0;	/* (not used) */
84 			break;
85 		default:
86 			usage();
87 			/* NO RETURN */
88 		}
89 	} else if (argc == 5) {
90 		switch (argv[2][0]) {
91 		case 'b':
92 			mode = S_IFBLK;
93 			break;
94 		case 'c':
95 			mode = S_IFCHR;
96 			break;
97 		default:
98 			usage();
99 		}
100 		majno = (major_t)number(argv[3]);
101 		if (majno == (major_t)-1 || majno > MAXMAJ) {
102 			(void) fprintf(stderr, "mknod: invalid major number "
103 			    "'%s' - valid range is 0-%lu\n", argv[3], MAXMAJ);
104 			return (2);
105 		}
106 		minno = (minor_t)number(argv[4]);
107 		if (minno == (minor_t)-1 || minno > MAXMIN) {
108 			(void) fprintf(stderr, "mknod: invalid minor number "
109 			    "'%s' - valid range is 0-%lu\n", argv[4], MAXMIN);
110 			return (2);
111 		}
112 		arg = makedev(majno, minno);
113 	} else
114 		usage();
115 
116 	return (domk(argv[1], (mode | ACC), arg) ? 2 : 0);
117 }
118 
119 static int
domk(const char * path,const mode_t mode,const dev_t arg)120 domk(const char *path, const mode_t mode, const dev_t arg)
121 {
122 	int ec;
123 
124 	if ((ec = mknod(path, mode, arg)) == -1) {
125 		perror("mknod");
126 	} else {
127 		/* chown() return deliberately ignored */
128 		(void) chown(path, getuid(), getgid());
129 	}
130 	return (ec);
131 }
132 
133 static long
number(const char * s)134 number(const char *s)
135 {
136 	long n;
137 
138 	errno = 0;
139 	n = strtol(s, NULL, 0);
140 	if (errno != 0 || n < 0)
141 		return (-1);
142 	return (n);
143 }
144 
145 static void
usage(void)146 usage(void)
147 {
148 	(void) fprintf(stderr, "usage: mknod name [ b/c major minor ] [ p ]\n");
149 	exit(2);
150 }
151