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
36 extern int preserve_perms;
37 extern int preserve_executability;
39 #define RETURN_ERROR_IF(x,e) \
47 #define RETURN_ERROR_IF_RO_OR_LO RETURN_ERROR_IF(read_only || list_only, EROFS)
49 int do_unlink(const char *fname)
51 if (dry_run) return 0;
52 RETURN_ERROR_IF_RO_OR_LO;
56 int do_symlink(const char *fname1, const char *fname2)
58 if (dry_run) return 0;
59 RETURN_ERROR_IF_RO_OR_LO;
60 return symlink(fname1, fname2);
64 int do_link(const char *fname1, const char *fname2)
66 if (dry_run) return 0;
67 RETURN_ERROR_IF_RO_OR_LO;
68 return link(fname1, fname2);
72 int do_lchown(const char *path, uid_t owner, gid_t group)
74 if (dry_run) return 0;
75 RETURN_ERROR_IF_RO_OR_LO;
79 return lchown(path, owner, group);
82 int do_mknod(const char *pathname, mode_t mode, dev_t dev)
84 if (dry_run) return 0;
85 RETURN_ERROR_IF_RO_OR_LO;
87 /* For --fake-super, we create a normal file with mode 0600. */
89 int fd = open(pathname, O_WRONLY|O_CREAT|O_TRUNC, S_IWUSR|S_IRUSR);
90 if (fd < 0 || close(fd) < 0)
95 #if !defined MKNOD_CREATES_FIFOS && defined HAVE_MKFIFO
97 return mkfifo(pathname, mode);
99 #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
100 if (S_ISSOCK(mode)) {
102 struct sockaddr_un saddr;
103 #ifdef HAVE_SOCKADDR_UN_LEN
106 strlcpy(saddr.sun_path, pathname, sizeof saddr.sun_path);
107 #ifdef HAVE_SOCKADDR_UN_LEN
108 saddr.sun_len = len >= sizeof saddr.sun_path
109 ? sizeof saddr.sun_path : len + 1;
111 saddr.sun_family = AF_UNIX;
113 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0
114 || (unlink(pathname) < 0 && errno != ENOENT)
115 || (bind(sock, (struct sockaddr*)&saddr, sizeof saddr)) < 0)
119 return do_chmod(pathname, mode);
126 return mknod(pathname, mode, dev);
132 int do_rmdir(const char *pathname)
134 if (dry_run) return 0;
135 RETURN_ERROR_IF_RO_OR_LO;
136 return rmdir(pathname);
139 int do_open(const char *pathname, int flags, mode_t mode)
141 if (flags != O_RDONLY) {
142 RETURN_ERROR_IF(dry_run, 0);
143 RETURN_ERROR_IF_RO_OR_LO;
146 return open(pathname, flags | O_BINARY, mode);
150 int do_chmod(const char *path, mode_t mode)
153 if (dry_run) return 0;
154 RETURN_ERROR_IF_RO_OR_LO;
156 code = lchmod(path, mode & CHMOD_BITS);
159 # if defined HAVE_SETATTRLIST
160 struct attrlist attrList;
161 uint32_t m = mode & CHMOD_BITS; /* manpage is wrong: not mode_t! */
163 memset(&attrList, 0, sizeof attrList);
164 attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
165 attrList.commonattr = ATTR_CMN_ACCESSMASK;
166 code = setattrlist(path, &attrList, &m, sizeof m, FSOPT_NOFOLLOW);
171 code = chmod(path, mode & CHMOD_BITS); /* DISCOURAGED FUNCTION */
172 #endif /* !HAVE_LCHMOD */
173 if (code != 0 && (preserve_perms || preserve_executability))
179 int do_rename(const char *fname1, const char *fname2)
181 if (dry_run) return 0;
182 RETURN_ERROR_IF_RO_OR_LO;
183 return rename(fname1, fname2);
186 #ifdef HAVE_FTRUNCATE
187 int do_ftruncate(int fd, OFF_T size)
191 if (dry_run) return 0;
192 RETURN_ERROR_IF_RO_OR_LO;
195 ret = ftruncate(fd, size);
196 } while (ret < 0 && errno == EINTR);
202 void trim_trailing_slashes(char *name)
205 /* Some BSD systems cannot make a directory if the name
206 * contains a trailing slash.
207 * <http://www.opensource.apple.com/bugs/X/BSD%20Kernel/2734739.html> */
209 /* Don't change empty string; and also we can't improve on
214 if (name[--l] != '/')
220 int do_mkdir(char *fname, mode_t mode)
222 if (dry_run) return 0;
223 RETURN_ERROR_IF_RO_OR_LO;
224 trim_trailing_slashes(fname);
225 return mkdir(fname, mode);
228 /* like mkstemp but forces permissions */
229 int do_mkstemp(char *template, mode_t perms)
231 RETURN_ERROR_IF(dry_run, 0);
232 RETURN_ERROR_IF(read_only, EROFS);
235 #if defined HAVE_SECURE_MKSTEMP && defined HAVE_FCHMOD && (!defined HAVE_OPEN64 || defined HAVE_MKSTEMP64)
237 int fd = mkstemp(template);
240 if (fchmod(fd, perms) != 0 && preserve_perms) {
241 int errno_save = errno;
247 #if defined HAVE_SETMODE && O_BINARY
248 setmode(fd, O_BINARY);
253 if (!mktemp(template))
255 return do_open(template, O_RDWR|O_EXCL|O_CREAT, perms);
259 int do_stat(const char *fname, STRUCT_STAT *st)
261 #ifdef USE_STAT64_FUNCS
262 return stat64(fname, st);
264 return stat(fname, st);
268 int do_lstat(const char *fname, STRUCT_STAT *st)
271 # ifdef USE_STAT64_FUNCS
272 return lstat64(fname, st);
274 return lstat(fname, st);
277 return do_stat(fname, st);
281 int do_fstat(int fd, STRUCT_STAT *st)
283 #ifdef USE_STAT64_FUNCS
284 return fstat64(fd, st);
286 return fstat(fd, st);
290 OFF_T do_lseek(int fd, OFF_T offset, int whence)
298 return lseek64(fd, offset, whence);
300 return lseek(fd, offset, whence);
304 #ifdef HAVE_UTIMENSAT
305 int do_utimensat(const char *fname, time_t modtime, uint32 mod_nsec)
307 struct timespec t[2];
309 if (dry_run) return 0;
310 RETURN_ERROR_IF_RO_OR_LO;
313 t[0].tv_nsec = UTIME_NOW;
314 t[1].tv_sec = modtime;
315 t[1].tv_nsec = mod_nsec;
316 return utimensat(AT_FDCWD, fname, t, AT_SYMLINK_NOFOLLOW);
321 int do_lutimes(const char *fname, time_t modtime, uint32 mod_nsec)
325 if (dry_run) return 0;
326 RETURN_ERROR_IF_RO_OR_LO;
328 t[0].tv_sec = time(NULL);
330 t[1].tv_sec = modtime;
331 t[1].tv_usec = mod_nsec / 1000;
332 return lutimes(fname, t);
337 int do_utimes(const char *fname, time_t modtime, uint32 mod_nsec)
341 if (dry_run) return 0;
342 RETURN_ERROR_IF_RO_OR_LO;
344 t[0].tv_sec = time(NULL);
346 t[1].tv_sec = modtime;
347 t[1].tv_usec = mod_nsec / 1000;
348 return utimes(fname, t);
351 #elif defined HAVE_UTIME
352 int do_utime(const char *fname, time_t modtime, UNUSED(uint32 mod_nsec))
354 #ifdef HAVE_STRUCT_UTIMBUF
360 if (dry_run) return 0;
361 RETURN_ERROR_IF_RO_OR_LO;
363 # ifdef HAVE_STRUCT_UTIMBUF
364 tbuf.actime = time(NULL);
365 tbuf.modtime = modtime;
366 return utime(fname, &tbuf);
370 return utime(fname, t);
375 #error Need utimes or utime function.