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3 * The Regents of the University of California. All rights reserved.
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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 1.7 2004/10/22 22:34:10 dillon Exp $
38 #include <sys/param.h>
41 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
57 #define YESNO "(y/n [n]) "
60 copy_file(FTSENT *entp, int dne)
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.)
88 printf("%s not overwritten\n", to.p_path);
91 fprintf(stderr, "overwrite %s? %s",
93 checkch = ch = getchar();
94 while (ch != '\n' && ch != EOF)
96 if (checkch != 'y' && checkch != 'Y') {
98 fprintf(stderr, "not overwritten\n");
104 /* remove existing destination file name,
105 * create a new file */
107 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
108 fs->st_mode & ~(S_ISUID | S_ISGID));
110 /* overwrite existing destination file name */
111 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0);
113 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
114 fs->st_mode & ~(S_ISUID | S_ISGID));
117 warn("%s", to.p_path);
125 * Mmap and write if less than 8M (the limit is so we don't totally
126 * trash memory on big files. This is really a minor hack, but it
127 * wins some CPU back.
129 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
130 if (S_ISREG(fs->st_mode) && fs->st_size <= 8 * 1048576) {
131 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
132 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) {
133 warn("%s", entp->fts_path);
136 for (bufp = p, wresid = fs->st_size; ;
137 bufp += wcount, wresid -= wcount) {
138 wcount = write(to_fd, bufp, wresid);
139 if (wcount >= wresid || wcount <= 0)
142 if (wcount != wresid) {
143 warn("%s", to.p_path);
146 /* Some systems don't unmap on close(2). */
147 if (munmap(p, fs->st_size) < 0) {
148 warn("%s", entp->fts_path);
155 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
156 for (bufp = buf, wresid = rcount; ;
157 bufp += wcount, wresid -= wcount) {
158 wcount = write(to_fd, bufp, wresid);
159 if (wcount >= wresid || wcount <= 0)
162 if (wcount != wresid) {
163 warn("%s", to.p_path);
169 warn("%s", entp->fts_path);
175 * Don't remove the target even after an error. The target might
176 * not be a regular file, or its attributes might be important,
177 * or its contents might be irreplaceable. It would only be safe
178 * to remove it if we created it and its length is 0.
181 if (pflag && setfile(fs, to_fd))
185 warn("%s", to.p_path);
192 copy_link(FTSENT *p, int exists)
195 char linkname[PATH_MAX];
197 if ((len = readlink(p->fts_path, linkname, sizeof(linkname) - 1)) == -1) {
198 warn("readlink: %s", p->fts_path);
201 linkname[len] = '\0';
202 if (exists && unlink(to.p_path)) {
203 warn("unlink: %s", to.p_path);
206 if (symlink(linkname, to.p_path)) {
207 warn("symlink: %s", linkname);
210 return (pflag ? setfile(p->fts_statp, -1) : 0);
214 copy_fifo(struct stat *from_stat, int exists)
216 if (exists && unlink(to.p_path)) {
217 warn("unlink: %s", to.p_path);
220 if (mkfifo(to.p_path, from_stat->st_mode)) {
221 warn("mkfifo: %s", to.p_path);
224 return (pflag ? setfile(from_stat, -1) : 0);
228 copy_special(struct stat *from_stat, int exists)
230 if (exists && unlink(to.p_path)) {
231 warn("unlink: %s", to.p_path);
234 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) {
235 warn("mknod: %s", to.p_path);
238 return (pflag ? setfile(from_stat, -1) : 0);
242 setfile(struct stat *fs, int fd)
244 static struct timeval tv[2];
246 int rval, gotstat, islink, fdval;
250 islink = !fdval && S_ISLNK(fs->st_mode);
251 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX |
252 S_IRWXU | S_IRWXG | S_IRWXO;
254 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
255 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
256 if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) {
257 warn("%sutimes: %s", islink ? "l" : "", to.p_path);
260 if (fdval ? fstat(fd, &ts) :
261 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) {
265 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX |
266 S_IRWXU | S_IRWXG | S_IRWXO;
269 * Changing the ownership probably won't succeed, unless we're root
270 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
271 * the mode; current BSD behavior is to remove all setuid bits on
272 * chown. If chown fails, lose setuid/setgid bits.
274 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid)
275 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) :
276 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) :
277 chown(to.p_path, fs->st_uid, fs->st_gid))) {
278 if (errno != EPERM) {
279 warn("chown: %s", to.p_path);
282 fs->st_mode &= ~(S_ISUID | S_ISGID);
285 if (!gotstat || fs->st_mode != ts.st_mode)
286 if (fdval ? fchmod(fd, fs->st_mode) :
287 (islink ? lchmod(to.p_path, fs->st_mode) :
288 chmod(to.p_path, fs->st_mode))) {
289 warn("chmod: %s", to.p_path);
293 if (!gotstat || fs->st_flags != ts.st_flags)
295 fchflags(fd, fs->st_flags) :
296 (islink ? (errno = ENOSYS) :
297 chflags(to.p_path, fs->st_flags))) {
298 warn("chflags: %s", to.p_path);
309 fprintf(stderr, "%s\n%s\n",
310 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src target",
311 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src1 ... srcN directory");