2 * Copyright (c) 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
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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 1.2 2003/06/17 04:22:49 dillon Exp $
38 #include <sys/param.h>
41 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
62 static char buf[MAXBSIZE];
64 int ch, checkch, from_fd, rcount, rval, to_fd, wcount, wresid;
66 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
70 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) {
71 warn("%s", entp->fts_path);
78 * If the file exists and we're interactive, verify with the user.
79 * If the file DNE, set the mode to be the from file, minus setuid
80 * bits, modified by the umask; arguably wrong, but it makes copying
81 * executables work right and it's been that way forever. (The
82 * other choice is 666 or'ed with the execute bits on the from file
83 * modified by the umask.)
86 #define YESNO "(y/n [n]) "
89 printf("%s not overwritten\n", to.p_path);
92 (void)fprintf(stderr, "overwrite %s? %s",
94 checkch = ch = getchar();
95 while (ch != '\n' && ch != EOF)
97 if (checkch != 'y' && checkch != 'Y') {
99 (void)fprintf(stderr, "not overwritten\n");
105 /* remove existing destination file name,
106 * create a new file */
107 (void)unlink(to.p_path);
108 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
109 fs->st_mode & ~(S_ISUID | S_ISGID));
111 /* overwrite existing destination file name */
112 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0);
114 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
115 fs->st_mode & ~(S_ISUID | S_ISGID));
118 warn("%s", to.p_path);
119 (void)close(from_fd);
126 * Mmap and write if less than 8M (the limit is so we don't totally
127 * trash memory on big files. This is really a minor hack, but it
128 * wins some CPU back.
130 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
131 if (S_ISREG(fs->st_mode) && fs->st_size <= 8 * 1048576) {
132 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
133 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) {
134 warn("%s", entp->fts_path);
137 for (bufp = p, wresid = fs->st_size; ;
138 bufp += wcount, wresid -= wcount) {
139 wcount = write(to_fd, bufp, wresid);
140 if (wcount >= wresid || wcount <= 0)
143 if (wcount != wresid) {
144 warn("%s", to.p_path);
147 /* Some systems don't unmap on close(2). */
148 if (munmap(p, fs->st_size) < 0) {
149 warn("%s", entp->fts_path);
156 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
157 for (bufp = buf, wresid = rcount; ;
158 bufp += wcount, wresid -= wcount) {
159 wcount = write(to_fd, bufp, wresid);
160 if (wcount >= wresid || wcount <= 0)
163 if (wcount != wresid) {
164 warn("%s", to.p_path);
170 warn("%s", entp->fts_path);
176 * Don't remove the target even after an error. The target might
177 * not be a regular file, or its attributes might be important,
178 * or its contents might be irreplaceable. It would only be safe
179 * to remove it if we created it and its length is 0.
182 if (pflag && setfile(fs, to_fd))
184 (void)close(from_fd);
186 warn("%s", to.p_path);
200 if ((len = readlink(p->fts_path, link, sizeof(link) - 1)) == -1) {
201 warn("readlink: %s", p->fts_path);
205 if (exists && unlink(to.p_path)) {
206 warn("unlink: %s", to.p_path);
209 if (symlink(link, to.p_path)) {
210 warn("symlink: %s", link);
217 copy_fifo(from_stat, exists)
218 struct stat *from_stat;
221 if (exists && unlink(to.p_path)) {
222 warn("unlink: %s", to.p_path);
225 if (mkfifo(to.p_path, from_stat->st_mode)) {
226 warn("mkfifo: %s", to.p_path);
229 return (pflag ? setfile(from_stat, 0) : 0);
233 copy_special(from_stat, exists)
234 struct stat *from_stat;
237 if (exists && unlink(to.p_path)) {
238 warn("unlink: %s", to.p_path);
241 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) {
242 warn("mknod: %s", to.p_path);
245 return (pflag ? setfile(from_stat, 0) : 0);
249 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO)
253 register struct stat *fs;
256 static struct timeval tv[2];
262 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX |
263 S_IRWXU | S_IRWXG | S_IRWXO;
265 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
266 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
267 if (utimes(to.p_path, tv)) {
268 warn("utimes: %s", to.p_path);
271 if (fd ? fstat(fd, &ts) : stat(to.p_path, &ts))
275 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX |
276 S_IRWXU | S_IRWXG | S_IRWXO;
279 * Changing the ownership probably won't succeed, unless we're root
280 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
281 * the mode; current BSD behavior is to remove all setuid bits on
282 * chown. If chown fails, lose setuid/setgid bits.
284 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid)
285 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) :
286 chown(to.p_path, fs->st_uid, fs->st_gid)) {
287 if (errno != EPERM) {
288 warn("chown: %s", to.p_path);
291 fs->st_mode &= ~(S_ISUID | S_ISGID);
294 if (!gotstat || fs->st_mode != ts.st_mode)
295 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) {
296 warn("chmod: %s", to.p_path);
300 if (!gotstat || fs->st_flags != ts.st_flags)
302 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) {
303 warn("chflags: %s", to.p_path);
314 (void)fprintf(stderr, "%s\n%s\n",
315 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src target",
316 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src1 ... srcN directory");