2 * Syscall wrappers to ensure that nothing gets done in dry_run mode
3 * and to handle system peculiarities.
5 * Copyright (C) 1998 Andrew Tridgell
6 * Copyright (C) 2002 Martin Pool
7 * Copyright (C) 2003-2009 Wayne Davison
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 3 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, visit the http://fsf.org website.
25 #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
28 #ifdef HAVE_SYS_ATTR_H
32 #if defined HAVE_SYS_FALLOCATE && !defined HAVE_FALLOCATE
33 #include <sys/syscall.h>
41 extern int preserve_perms;
42 extern int preserve_executability;
44 #define RETURN_ERROR_IF(x,e) \
52 #define RETURN_ERROR_IF_RO_OR_LO RETURN_ERROR_IF(read_only || list_only, EROFS)
54 int do_unlink(const char *fname)
56 if (dry_run) return 0;
57 RETURN_ERROR_IF_RO_OR_LO;
62 int do_symlink(const char *lnk, const char *fname)
64 if (dry_run) return 0;
65 RETURN_ERROR_IF_RO_OR_LO;
67 #if defined NO_SYMLINK_XATTRS || defined NO_SYMLINK_USER_XATTRS
68 /* For --fake-super, we create a normal file with mode 0600
69 * and write the lnk into it. */
71 int ok, len = strlen(lnk);
72 int fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, S_IWUSR|S_IRUSR);
75 ok = write(fd, lnk, len) == len;
82 return symlink(lnk, fname);
85 #if defined NO_SYMLINK_XATTRS || defined NO_SYMLINK_USER_XATTRS
86 ssize_t do_readlink(const char *path, char *buf, size_t bufsiz)
88 /* For --fake-super, we read the link from the file. */
90 int fd = open(path, O_RDONLY|O_NOFOLLOW);
92 int len = read(fd, buf, bufsiz);
98 /* A real symlink needs to be turned into a fake one on the receiving
99 * side, so tell the generator that the link has no length. */
102 /* Otherwise fall through and let the sender report the real length. */
105 return readlink(path, buf, bufsiz);
111 int do_link(const char *fname1, const char *fname2)
113 if (dry_run) return 0;
114 RETURN_ERROR_IF_RO_OR_LO;
115 return link(fname1, fname2);
119 int do_lchown(const char *path, uid_t owner, gid_t group)
121 if (dry_run) return 0;
122 RETURN_ERROR_IF_RO_OR_LO;
126 return lchown(path, owner, group);
129 int do_mknod(const char *pathname, mode_t mode, dev_t dev)
131 if (dry_run) return 0;
132 RETURN_ERROR_IF_RO_OR_LO;
134 /* For --fake-super, we create a normal file with mode 0600. */
136 int fd = open(pathname, O_WRONLY|O_CREAT|O_TRUNC, S_IWUSR|S_IRUSR);
137 if (fd < 0 || close(fd) < 0)
142 #if !defined MKNOD_CREATES_FIFOS && defined HAVE_MKFIFO
144 return mkfifo(pathname, mode);
146 #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
147 if (S_ISSOCK(mode)) {
149 struct sockaddr_un saddr;
150 #ifdef HAVE_SOCKADDR_UN_LEN
153 strlcpy(saddr.sun_path, pathname, sizeof saddr.sun_path);
154 #ifdef HAVE_SOCKADDR_UN_LEN
155 saddr.sun_len = len >= sizeof saddr.sun_path
156 ? sizeof saddr.sun_path : len + 1;
158 saddr.sun_family = AF_UNIX;
160 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0
161 || (unlink(pathname) < 0 && errno != ENOENT)
162 || (bind(sock, (struct sockaddr*)&saddr, sizeof saddr)) < 0)
166 return do_chmod(pathname, mode);
173 return mknod(pathname, mode, dev);
179 int do_rmdir(const char *pathname)
181 if (dry_run) return 0;
182 RETURN_ERROR_IF_RO_OR_LO;
183 return rmdir(pathname);
186 int do_open(const char *pathname, int flags, mode_t mode)
188 if (flags != O_RDONLY) {
189 RETURN_ERROR_IF(dry_run, 0);
190 RETURN_ERROR_IF_RO_OR_LO;
193 return open(pathname, flags | O_BINARY, mode);
197 int do_chmod(const char *path, mode_t mode)
200 if (dry_run) return 0;
201 RETURN_ERROR_IF_RO_OR_LO;
203 code = lchmod(path, mode & CHMOD_BITS);
206 # if defined HAVE_SETATTRLIST
207 struct attrlist attrList;
208 uint32_t m = mode & CHMOD_BITS; /* manpage is wrong: not mode_t! */
210 memset(&attrList, 0, sizeof attrList);
211 attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
212 attrList.commonattr = ATTR_CMN_ACCESSMASK;
213 code = setattrlist(path, &attrList, &m, sizeof m, FSOPT_NOFOLLOW);
218 code = chmod(path, mode & CHMOD_BITS); /* DISCOURAGED FUNCTION */
219 #endif /* !HAVE_LCHMOD */
220 if (code != 0 && (preserve_perms || preserve_executability))
226 int do_rename(const char *fname1, const char *fname2)
228 if (dry_run) return 0;
229 RETURN_ERROR_IF_RO_OR_LO;
230 return rename(fname1, fname2);
233 #ifdef HAVE_FTRUNCATE
234 int do_ftruncate(int fd, OFF_T size)
238 if (dry_run) return 0;
239 RETURN_ERROR_IF_RO_OR_LO;
242 ret = ftruncate(fd, size);
243 } while (ret < 0 && errno == EINTR);
249 void trim_trailing_slashes(char *name)
252 /* Some BSD systems cannot make a directory if the name
253 * contains a trailing slash.
254 * <http://www.opensource.apple.com/bugs/X/BSD%20Kernel/2734739.html> */
256 /* Don't change empty string; and also we can't improve on
261 if (name[--l] != '/')
267 int do_mkdir(char *fname, mode_t mode)
269 if (dry_run) return 0;
270 RETURN_ERROR_IF_RO_OR_LO;
271 trim_trailing_slashes(fname);
272 return mkdir(fname, mode);
275 /* like mkstemp but forces permissions */
276 int do_mkstemp(char *template, mode_t perms)
278 RETURN_ERROR_IF(dry_run, 0);
279 RETURN_ERROR_IF(read_only, EROFS);
282 #if defined HAVE_SECURE_MKSTEMP && defined HAVE_FCHMOD && (!defined HAVE_OPEN64 || defined HAVE_MKSTEMP64)
284 int fd = mkstemp(template);
287 if (fchmod(fd, perms) != 0 && preserve_perms) {
288 int errno_save = errno;
294 #if defined HAVE_SETMODE && O_BINARY
295 setmode(fd, O_BINARY);
300 if (!mktemp(template))
302 return do_open(template, O_RDWR|O_EXCL|O_CREAT, perms);
306 int do_stat(const char *fname, STRUCT_STAT *st)
308 #ifdef USE_STAT64_FUNCS
309 return stat64(fname, st);
311 return stat(fname, st);
315 int do_lstat(const char *fname, STRUCT_STAT *st)
318 # ifdef USE_STAT64_FUNCS
319 return lstat64(fname, st);
321 return lstat(fname, st);
324 return do_stat(fname, st);
328 int do_fstat(int fd, STRUCT_STAT *st)
330 #ifdef USE_STAT64_FUNCS
331 return fstat64(fd, st);
333 return fstat(fd, st);
337 OFF_T do_lseek(int fd, OFF_T offset, int whence)
345 return lseek64(fd, offset, whence);
347 return lseek(fd, offset, whence);
351 #ifdef HAVE_UTIMENSAT
352 int do_utimensat(const char *fname, time_t modtime, uint32 mod_nsec)
354 struct timespec t[2];
356 if (dry_run) return 0;
357 RETURN_ERROR_IF_RO_OR_LO;
360 t[0].tv_nsec = UTIME_NOW;
361 t[1].tv_sec = modtime;
362 t[1].tv_nsec = mod_nsec;
363 return utimensat(AT_FDCWD, fname, t, AT_SYMLINK_NOFOLLOW);
368 int do_lutimes(const char *fname, time_t modtime, uint32 mod_nsec)
372 if (dry_run) return 0;
373 RETURN_ERROR_IF_RO_OR_LO;
375 t[0].tv_sec = time(NULL);
377 t[1].tv_sec = modtime;
378 t[1].tv_usec = mod_nsec / 1000;
379 return lutimes(fname, t);
384 int do_utimes(const char *fname, time_t modtime, uint32 mod_nsec)
388 if (dry_run) return 0;
389 RETURN_ERROR_IF_RO_OR_LO;
391 t[0].tv_sec = time(NULL);
393 t[1].tv_sec = modtime;
394 t[1].tv_usec = mod_nsec / 1000;
395 return utimes(fname, t);
398 #elif defined HAVE_UTIME
399 int do_utime(const char *fname, time_t modtime, UNUSED(uint32 mod_nsec))
401 #ifdef HAVE_STRUCT_UTIMBUF
407 if (dry_run) return 0;
408 RETURN_ERROR_IF_RO_OR_LO;
410 # ifdef HAVE_STRUCT_UTIMBUF
411 tbuf.actime = time(NULL);
412 tbuf.modtime = modtime;
413 return utime(fname, &tbuf);
417 return utime(fname, t);
422 #error Need utimes or utime function.
425 #ifdef SUPPORT_PREALLOCATION
426 int do_fallocate(int fd, OFF_T offset, OFF_T length)
428 #ifdef FALLOC_FL_KEEP_SIZE
429 #define DO_FALLOC_OPTIONS FALLOC_FL_KEEP_SIZE
431 #define DO_FALLOC_OPTIONS 0
433 RETURN_ERROR_IF(dry_run, 0);
434 RETURN_ERROR_IF_RO_OR_LO;
435 #if defined HAVE_FALLOCATE
436 return fallocate(fd, DO_FALLOC_OPTIONS, offset, length);
437 #elif defined HAVE_SYS_FALLOCATE
438 return syscall(SYS_fallocate, fd, DO_FALLOC_OPTIONS, (loff_t)offset, (loff_t)length);
439 #elif defined HAVE_EFFICIENT_POSIX_FALLOCATE
440 return posix_fallocate(fd, offset, length);
442 #error Coding error in SUPPORT_PREALLOCATION logic.