2 * Copyright (c) 1991, 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 * @(#)utils.c 8.3 (Berkeley) 4/1/94
34 * $FreeBSD: src/bin/cp/utils.c,v 1.27.2.6 2002/08/10 13:20:19 johan Exp $
35 * $DragonFly: src/bin/cp/utils.c,v 1.4 2004/07/22 11:41:56 asmodai Exp $
38 #include <sys/param.h>
41 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
58 copy_file(FTSENT *entp, int dne)
60 static char buf[MAXBSIZE];
62 int ch, checkch, from_fd, rcount, rval, to_fd, wcount, wresid;
64 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
68 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) {
69 warn("%s", entp->fts_path);
76 * If the file exists and we're interactive, verify with the user.
77 * If the file DNE, set the mode to be the from file, minus setuid
78 * bits, modified by the umask; arguably wrong, but it makes copying
79 * executables work right and it's been that way forever. (The
80 * other choice is 666 or'ed with the execute bits on the from file
81 * modified by the umask.)
84 #define YESNO "(y/n [n]) "
87 printf("%s not overwritten\n", to.p_path);
90 (void)fprintf(stderr, "overwrite %s? %s",
92 checkch = ch = getchar();
93 while (ch != '\n' && ch != EOF)
95 if (checkch != 'y' && checkch != 'Y') {
97 (void)fprintf(stderr, "not overwritten\n");
103 /* remove existing destination file name,
104 * create a new file */
105 (void)unlink(to.p_path);
106 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
107 fs->st_mode & ~(S_ISUID | S_ISGID));
109 /* overwrite existing destination file name */
110 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0);
112 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
113 fs->st_mode & ~(S_ISUID | S_ISGID));
116 warn("%s", to.p_path);
117 (void)close(from_fd);
124 * Mmap and write if less than 8M (the limit is so we don't totally
125 * trash memory on big files. This is really a minor hack, but it
126 * wins some CPU back.
128 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
129 if (S_ISREG(fs->st_mode) && fs->st_size <= 8 * 1048576) {
130 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
131 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) {
132 warn("%s", entp->fts_path);
135 for (bufp = p, wresid = fs->st_size; ;
136 bufp += wcount, wresid -= wcount) {
137 wcount = write(to_fd, bufp, wresid);
138 if (wcount >= wresid || wcount <= 0)
141 if (wcount != wresid) {
142 warn("%s", to.p_path);
145 /* Some systems don't unmap on close(2). */
146 if (munmap(p, fs->st_size) < 0) {
147 warn("%s", entp->fts_path);
154 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
155 for (bufp = buf, wresid = rcount; ;
156 bufp += wcount, wresid -= wcount) {
157 wcount = write(to_fd, bufp, wresid);
158 if (wcount >= wresid || wcount <= 0)
161 if (wcount != wresid) {
162 warn("%s", to.p_path);
168 warn("%s", entp->fts_path);
174 * Don't remove the target even after an error. The target might
175 * not be a regular file, or its attributes might be important,
176 * or its contents might be irreplaceable. It would only be safe
177 * to remove it if we created it and its length is 0.
180 if (pflag && setfile(fs, to_fd))
182 (void)close(from_fd);
184 warn("%s", to.p_path);
191 copy_link(FTSENT *p, int exists)
194 char linkname[PATH_MAX];
196 if ((len = readlink(p->fts_path, linkname, sizeof(linkname) - 1)) == -1) {
197 warn("readlink: %s", p->fts_path);
200 linkname[len] = '\0';
201 if (exists && unlink(to.p_path)) {
202 warn("unlink: %s", to.p_path);
205 if (symlink(linkname, to.p_path)) {
206 warn("symlink: %s", linkname);
213 copy_fifo(struct stat *from_stat, int exists)
215 if (exists && unlink(to.p_path)) {
216 warn("unlink: %s", to.p_path);
219 if (mkfifo(to.p_path, from_stat->st_mode)) {
220 warn("mkfifo: %s", to.p_path);
223 return (pflag ? setfile(from_stat, 0) : 0);
227 copy_special(struct stat *from_stat, int exists)
229 if (exists && unlink(to.p_path)) {
230 warn("unlink: %s", to.p_path);
233 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) {
234 warn("mknod: %s", to.p_path);
237 return (pflag ? setfile(from_stat, 0) : 0);
241 setfile(struct stat *fs, int fd)
243 static struct timeval tv[2];
249 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX |
250 S_IRWXU | S_IRWXG | S_IRWXO;
252 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
253 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
254 if (utimes(to.p_path, tv)) {
255 warn("utimes: %s", to.p_path);
258 if (fd ? fstat(fd, &ts) : stat(to.p_path, &ts))
262 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX |
263 S_IRWXU | S_IRWXG | S_IRWXO;
266 * Changing the ownership probably won't succeed, unless we're root
267 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
268 * the mode; current BSD behavior is to remove all setuid bits on
269 * chown. If chown fails, lose setuid/setgid bits.
271 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid)
272 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) :
273 chown(to.p_path, fs->st_uid, fs->st_gid)) {
274 if (errno != EPERM) {
275 warn("chown: %s", to.p_path);
278 fs->st_mode &= ~(S_ISUID | S_ISGID);
281 if (!gotstat || fs->st_mode != ts.st_mode)
282 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) {
283 warn("chmod: %s", to.p_path);
287 if (!gotstat || fs->st_flags != ts.st_flags)
289 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) {
290 warn("chflags: %s", to.p_path);
301 (void)fprintf(stderr, "%s\n%s\n",
302 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src target",
303 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src1 ... srcN directory");