xref: /illumos-gate/usr/src/uts/common/syscall/unlink.c (revision c4d3e299)
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 (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
24  */
25 
26 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
27 /*	  All Rights Reserved  	*/
28 
29 /*
30  * Portions of this source code were derived from Berkeley 4.3 BSD
31  * under license from the Regents of the University of California.
32  */
33 
34 #include <sys/param.h>
35 #include <sys/isa_defs.h>
36 #include <sys/types.h>
37 #include <sys/sysmacros.h>
38 #include <sys/systm.h>
39 #include <sys/errno.h>
40 #include <sys/vnode.h>
41 #include <sys/uio.h>
42 #include <sys/debug.h>
43 #include <sys/file.h>
44 #include <sys/fcntl.h>
45 #include <c2/audit.h>
46 
47 /*
48  * Unlink a file from a directory
49  */
50 int
51 unlinkat(int fd, char *name, int flags)
52 {
53 	file_t *dirfp;
54 	vnode_t *dirvp;
55 	int error;
56 	char startchar;
57 
58 	if (fd == AT_FDCWD && name == NULL)
59 		return (set_errno(EFAULT));
60 
61 	if (name != NULL) {
62 		if (copyin(name, &startchar, sizeof (char)))
63 			return (set_errno(EFAULT));
64 	} else
65 		startchar = '\0';
66 
67 	if (fd == AT_FDCWD) {
68 		dirvp = NULL;
69 	} else {
70 		if (startchar != '/') {
71 			if ((dirfp = getf(fd)) == NULL) {
72 				return (set_errno(EBADF));
73 			}
74 			dirvp = dirfp->f_vnode;
75 			VN_HOLD(dirvp);
76 			releasef(fd);
77 		} else {
78 			dirvp = NULL;
79 		}
80 	}
81 
82 	if (AU_AUDITING() && (dirvp != NULL))
83 		audit_setfsat_path(1);
84 
85 	error = vn_removeat(dirvp, name,
86 	    UIO_USERSPACE, (flags == AT_REMOVEDIR) ? RMDIRECTORY : RMFILE);
87 	if (dirvp != NULL)
88 		VN_RELE(dirvp);
89 
90 	if (error != NULL)
91 		return (set_errno(error));
92 	return (0);
93 }
94 
95 int
96 unlink(char *name)
97 {
98 	return (unlinkat(AT_FDCWD, name, 0));
99 }
100 
101 int
102 rmdir(char *name)
103 {
104 	return (unlinkat(AT_FDCWD, name, AT_REMOVEDIR));
105 }
106