2 * Copyright (c) 1987, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#) Copyright (c) 1987, 1993, 1994 The Regents of the University of California. All rights reserved.
34 * @(#)ln.c 8.2 (Berkeley) 3/31/94
35 * $FreeBSD: src/bin/ln/ln.c,v 1.15.2.4 2002/07/12 07:34:38 tjr Exp $
36 * $DragonFly: src/bin/ln/ln.c,v 1.11 2006/09/25 09:27:21 corecode Exp $
39 #include <sys/param.h>
49 static int fflag; /* Unlink existing files. */
50 static int hflag; /* Check new name for symlink first. */
51 static int iflag; /* Interactive mode. */
52 static int sflag; /* Symbolic, not hard, link. */
53 static int vflag; /* Verbose output. */
54 /* System link call. */
55 static int (*linkf)(const char *, const char *);
58 static int linkit(const char *, const char *, int);
59 static void usage(void);
62 main(int argc, char *argv[])
69 * Test for the special case where the utility is called as
70 * "link", for which the functionality provided is greatly
73 if ((p = strrchr(argv[0], '/')) == NULL)
77 if (strcmp(p, "link") == 0) {
78 while (getopt(argc, argv, "") != -1)
85 exit(linkit(argv[0], argv[1], 0));
88 while ((ch = getopt(argc, argv, "fhinsv")) != -1) {
117 linkf = sflag ? symlink : link;
118 linkch = sflag ? '-' : '=';
124 case 1: /* ln target */
125 exit(linkit(argv[0], ".", 1));
126 case 2: /* ln target source */
127 exit(linkit(argv[0], argv[1], 0));
131 /* ln target1 target2 directory */
132 sourcedir = argv[argc - 1];
133 if (hflag && lstat(sourcedir, &sb) == 0 && S_ISLNK(sb.st_mode)) {
135 * We were asked not to follow symlinks, but found one at
136 * the target--simulate "not a directory" error
138 errc(1, ENOTDIR, "%s", sourcedir);
140 if (stat(sourcedir, &sb) != 0)
141 err(1, "%s", sourcedir);
142 if (!S_ISDIR(sb.st_mode))
144 for (exitval = 0; *argv != sourcedir; ++argv)
145 exitval |= linkit(*argv, sourcedir, 1);
150 * Nomenclature warning!
152 * In this source "target" and "source" are used the opposite way they
153 * are used in the ln(1) manual. Here "target" is the existing file and
154 * "source" specifies the to-be-created link to "target".
157 linkit(const char *target, const char *source, int isdir)
161 int ch, exists, first;
165 /* If target doesn't exist, quit now. */
166 if (stat(target, &sb) != 0) {
170 /* Only symbolic links to directories. */
171 if (S_ISDIR(sb.st_mode)) {
179 * If the source is a directory (and not a symlink if hflag),
180 * append the target's name.
183 (lstat(source, &sb) == 0 && S_ISDIR(sb.st_mode)) ||
184 (!hflag && stat(source, &sb) == 0 && S_ISDIR(sb.st_mode))) {
185 if ((p = strrchr(target, '/')) == NULL)
189 if (snprintf(path, sizeof(path), "%s/%s", source, p) >=
191 errno = ENAMETOOLONG;
198 exists = (lstat(source, &sb) == 0);
200 * If doing hard links and the source (destination) exists and it
201 * actually is the same file like the target (existing file), we
202 * complain that the files are identical. If -f is specified, we
203 * accept the job as already done and return with success.
205 if (exists && !sflag) {
208 if (stat(target, &tsb) != 0) {
209 warn("%s: disappeared", target);
213 if (tsb.st_dev == sb.st_dev && tsb.st_ino == sb.st_ino) {
214 warnx("%s and %s are identical (not linked).", target, source);
222 * If the file exists, then unlink it forcibly if -f was specified
223 * and interactively if -i was specified.
225 if (fflag && exists) {
226 if (unlink(source) != 0) {
230 } else if (iflag && exists) {
232 fprintf(stderr, "replace %s? ", source);
234 first = ch = getchar();
235 while(ch != '\n' && ch != EOF)
237 if (first != 'y' && first != 'Y') {
238 fprintf(stderr, "not replaced\n");
242 if (unlink(source) != 0) {
248 /* Attempt the link. */
249 if ((*linkf)(target, source) != 0) {
254 printf("%s %c> %s\n", source, linkch, target);
261 fprintf(stderr, "%s\n%s\n%s\n",
262 "usage: ln [-fhinsv] file1 file2",
263 " ln [-fhinsv] file ... directory",
264 " link file1 file2");