Annotation of embedaddon/rsync/syscall.c, revision 1.1.1.4
1.1 misho 1: /*
2: * Syscall wrappers to ensure that nothing gets done in dry_run mode
3: * and to handle system peculiarities.
4: *
5: * Copyright (C) 1998 Andrew Tridgell
6: * Copyright (C) 2002 Martin Pool
1.1.1.4 ! misho 7: * Copyright (C) 2003-2020 Wayne Davison
1.1 misho 8: *
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.
13: *
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.
18: *
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.
21: */
22:
23: #include "rsync.h"
24:
25: #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
26: #include <sys/un.h>
27: #endif
28: #ifdef HAVE_SYS_ATTR_H
29: #include <sys/attr.h>
30: #endif
31:
1.1.1.2 misho 32: #if defined HAVE_SYS_FALLOCATE && !defined HAVE_FALLOCATE
33: #include <sys/syscall.h>
34: #endif
35:
1.1 misho 36: extern int dry_run;
37: extern int am_root;
1.1.1.2 misho 38: extern int am_sender;
1.1 misho 39: extern int read_only;
40: extern int list_only;
1.1.1.4 ! misho 41: extern int force_change;
! 42: extern int inplace;
! 43: extern int preallocate_files;
1.1 misho 44: extern int preserve_perms;
45: extern int preserve_executability;
1.1.1.4 ! misho 46: extern int open_noatime;
! 47:
! 48: int direct_io = 0;
! 49:
! 50: #ifndef S_BLKSIZE
! 51: # if defined hpux || defined __hpux__ || defined __hpux
! 52: # define S_BLKSIZE 1024
! 53: # elif defined _AIX && defined _I386
! 54: # define S_BLKSIZE 4096
! 55: # else
! 56: # define S_BLKSIZE 512
! 57: # endif
! 58: #endif
! 59:
! 60: #ifdef SUPPORT_CRTIMES
! 61: #pragma pack(push, 4)
! 62: struct create_time {
! 63: uint32 length;
! 64: struct timespec crtime;
! 65: };
! 66: #pragma pack(pop)
! 67: #endif
1.1 misho 68:
69: #define RETURN_ERROR_IF(x,e) \
70: do { \
71: if (x) { \
72: errno = (e); \
73: return -1; \
74: } \
75: } while (0)
76:
77: #define RETURN_ERROR_IF_RO_OR_LO RETURN_ERROR_IF(read_only || list_only, EROFS)
78:
79: int do_unlink(const char *fname)
80: {
81: if (dry_run) return 0;
82: RETURN_ERROR_IF_RO_OR_LO;
1.1.1.4 ! misho 83: if (unlink(fname) == 0)
! 84: return 0;
! 85: #ifdef SUPPORT_FORCE_CHANGE
! 86: if (force_change && errno == EPERM) {
! 87: STRUCT_STAT st;
! 88:
! 89: if (x_lstat(fname, &st, NULL) == 0
! 90: && make_mutable(fname, st.st_mode, st.st_flags, force_change) > 0) {
! 91: if (unlink(fname) == 0)
! 92: return 0;
! 93: undo_make_mutable(fname, st.st_flags);
! 94: }
! 95: /* TODO: handle immutable directories */
! 96: errno = EPERM;
! 97: }
! 98: #endif
! 99: return -1;
1.1 misho 100: }
101:
1.1.1.2 misho 102: #ifdef SUPPORT_LINKS
103: int do_symlink(const char *lnk, const char *fname)
1.1 misho 104: {
105: if (dry_run) return 0;
106: RETURN_ERROR_IF_RO_OR_LO;
1.1.1.2 misho 107:
108: #if defined NO_SYMLINK_XATTRS || defined NO_SYMLINK_USER_XATTRS
109: /* For --fake-super, we create a normal file with mode 0600
110: * and write the lnk into it. */
111: if (am_root < 0) {
112: int ok, len = strlen(lnk);
1.1.1.4 ! misho 113: int flags = O_WRONLY|O_CREAT|O_TRUNC;
! 114:
! 115: if (direct_io)
! 116: flags |= O_DIRECT;
! 117:
! 118: int fd = open(fname, flags, S_IWUSR|S_IRUSR);
1.1.1.2 misho 119: if (fd < 0)
120: return -1;
121: ok = write(fd, lnk, len) == len;
122: if (close(fd) < 0)
123: ok = 0;
124: return ok ? 0 : -1;
125: }
126: #endif
127:
128: return symlink(lnk, fname);
1.1 misho 129: }
130:
1.1.1.2 misho 131: #if defined NO_SYMLINK_XATTRS || defined NO_SYMLINK_USER_XATTRS
132: ssize_t do_readlink(const char *path, char *buf, size_t bufsiz)
133: {
134: /* For --fake-super, we read the link from the file. */
135: if (am_root < 0) {
136: int fd = do_open_nofollow(path, O_RDONLY);
137: if (fd >= 0) {
138: int len = read(fd, buf, bufsiz);
139: close(fd);
140: return len;
141: }
142: if (errno != ELOOP)
143: return -1;
144: /* A real symlink needs to be turned into a fake one on the receiving
145: * side, so tell the generator that the link has no length. */
146: if (!am_sender)
147: return 0;
148: /* Otherwise fall through and let the sender report the real length. */
149: }
150:
151: return readlink(path, buf, bufsiz);
152: }
153: #endif
154: #endif
155:
1.1.1.4 ! misho 156: #if defined HAVE_LINK || defined HAVE_LINKAT
! 157: int do_link(const char *old_path, const char *new_path)
1.1 misho 158: {
1.1.1.4 ! misho 159: int st;
! 160:
1.1 misho 161: if (dry_run) return 0;
162: RETURN_ERROR_IF_RO_OR_LO;
1.1.1.4 ! misho 163: #ifdef HAVE_LINKAT
! 164: st = linkat(AT_FDCWD, old_path, AT_FDCWD, new_path, 0);
! 165: #else
! 166: st = link(old_path, new_path);
! 167: #endif
! 168: if (/*soften_links &&*/ st != 0 && errno == EXDEV)
! 169: st = symlink(old_path, new_path);
! 170: return st;
1.1 misho 171: }
172: #endif
173:
1.1.1.4 ! misho 174: int do_clone(const char *old_path, const char *new_path, mode_t mode)
! 175: {
! 176: #ifdef FICLONE
! 177: int ifd, ofd, ret, save_errno;
! 178:
! 179: if (dry_run) return 0;
! 180: RETURN_ERROR_IF_RO_OR_LO;
! 181:
! 182: if ((ifd = do_open(old_path, O_RDONLY, 0)) < 0) {
! 183: save_errno = errno;
! 184: rsyserr(FERROR_XFER, errno, "open %s", full_fname(old_path));
! 185: errno = save_errno;
! 186: return -1;
! 187: }
! 188:
! 189: if (robust_unlink(new_path) && errno != ENOENT) {
! 190: save_errno = errno;
! 191: rsyserr(FERROR_XFER, errno, "unlink %s", full_fname(new_path));
! 192: close(ifd);
! 193: errno = save_errno;
! 194: return -1;
! 195: }
! 196:
! 197: mode &= INITACCESSPERMS;
! 198: if ((ofd = do_open(new_path, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, mode)) < 0) {
! 199: save_errno = errno;
! 200: rsyserr(FERROR_XFER, save_errno, "open %s", full_fname(new_path));
! 201: close(ifd);
! 202: errno = save_errno;
! 203: return -1;
! 204: }
! 205:
! 206: ret = ioctl(ofd, FICLONE, ifd);
! 207: save_errno = errno;
! 208: close(ifd);
! 209: close(ofd);
! 210: if (ret < 0)
! 211: unlink(new_path);
! 212: errno = save_errno;
! 213: return ret;
! 214: #else
! 215: (void)old_path;
! 216: (void)new_path;
! 217: errno = ENOTSUP;
! 218: return -1;
! 219: #endif
! 220: }
! 221:
! 222: int do_lchown(const char *path, uid_t owner, gid_t group, UNUSED(mode_t mode), UNUSED(uint32 fileflags))
1.1 misho 223: {
224: if (dry_run) return 0;
225: RETURN_ERROR_IF_RO_OR_LO;
226: #ifndef HAVE_LCHOWN
227: #define lchown chown
228: #endif
1.1.1.4 ! misho 229: if (lchown(path, owner, group) == 0)
! 230: return 0;
! 231: #ifdef SUPPORT_FORCE_CHANGE
! 232: if (force_change && errno == EPERM) {
! 233: if (fileflags == NO_FFLAGS) {
! 234: STRUCT_STAT st;
! 235: if (x_lstat(path, &st, NULL) == 0) {
! 236: mode = st.st_mode;
! 237: fileflags = st.st_flags;
! 238: }
! 239: }
! 240: if (fileflags != NO_FFLAGS
! 241: && make_mutable(path, mode, fileflags, force_change) > 0) {
! 242: int ret = lchown(path, owner, group);
! 243: undo_make_mutable(path, fileflags);
! 244: if (ret == 0)
! 245: return 0;
! 246: }
! 247: errno = EPERM;
! 248: }
! 249: #endif
! 250: return -1;
1.1 misho 251: }
252:
253: int do_mknod(const char *pathname, mode_t mode, dev_t dev)
254: {
255: if (dry_run) return 0;
256: RETURN_ERROR_IF_RO_OR_LO;
257:
258: /* For --fake-super, we create a normal file with mode 0600. */
259: if (am_root < 0) {
260: int fd = open(pathname, O_WRONLY|O_CREAT|O_TRUNC, S_IWUSR|S_IRUSR);
261: if (fd < 0 || close(fd) < 0)
262: return -1;
263: return 0;
264: }
265:
266: #if !defined MKNOD_CREATES_FIFOS && defined HAVE_MKFIFO
267: if (S_ISFIFO(mode))
268: return mkfifo(pathname, mode);
269: #endif
270: #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
271: if (S_ISSOCK(mode)) {
272: int sock;
273: struct sockaddr_un saddr;
1.1.1.3 misho 274: unsigned int len = strlcpy(saddr.sun_path, pathname, sizeof saddr.sun_path);
275: if (len >= sizeof saddr.sun_path) {
276: errno = ENAMETOOLONG;
277: return -1;
278: }
1.1 misho 279: #ifdef HAVE_SOCKADDR_UN_LEN
1.1.1.3 misho 280: saddr.sun_len = len + 1;
1.1 misho 281: #endif
282: saddr.sun_family = AF_UNIX;
283:
284: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0
1.1.1.4 ! misho 285: || (unlink(pathname) < 0 && errno != ENOENT)
! 286: || (bind(sock, (struct sockaddr*)&saddr, sizeof saddr)) < 0)
1.1 misho 287: return -1;
288: close(sock);
289: #ifdef HAVE_CHMOD
1.1.1.4 ! misho 290: return do_chmod(pathname, mode, 0);
1.1 misho 291: #else
292: return 0;
293: #endif
294: }
295: #endif
296: #ifdef HAVE_MKNOD
297: return mknod(pathname, mode, dev);
298: #else
299: return -1;
300: #endif
301: }
302:
303: int do_rmdir(const char *pathname)
304: {
305: if (dry_run) return 0;
306: RETURN_ERROR_IF_RO_OR_LO;
1.1.1.4 ! misho 307: if (rmdir(pathname) == 0)
! 308: return 0;
! 309: #ifdef SUPPORT_FORCE_CHANGE
! 310: if (force_change && errno == EPERM) {
! 311: STRUCT_STAT st;
! 312:
! 313: if (x_lstat(pathname, &st, NULL) == 0
! 314: && make_mutable(pathname, st.st_mode, st.st_flags, force_change) > 0) {
! 315: if (rmdir(pathname) == 0)
! 316: return 0;
! 317: undo_make_mutable(pathname, st.st_flags);
! 318: }
! 319: errno = EPERM;
! 320: }
! 321: #endif
! 322: return -1;
1.1 misho 323: }
324:
325: int do_open(const char *pathname, int flags, mode_t mode)
326: {
327: if (flags != O_RDONLY) {
328: RETURN_ERROR_IF(dry_run, 0);
329: RETURN_ERROR_IF_RO_OR_LO;
330: }
331:
1.1.1.4 ! misho 332: #ifdef O_NOATIME
! 333: if (open_noatime)
! 334: flags |= O_NOATIME;
! 335: #endif
! 336: if (direct_io)
! 337: flags |= O_DIRECT;
! 338:
1.1 misho 339: return open(pathname, flags | O_BINARY, mode);
340: }
341:
342: #ifdef HAVE_CHMOD
1.1.1.4 ! misho 343: int do_chmod(const char *path, mode_t mode, UNUSED(uint32 fileflags))
1.1 misho 344: {
345: int code;
346: if (dry_run) return 0;
347: RETURN_ERROR_IF_RO_OR_LO;
348: #ifdef HAVE_LCHMOD
349: code = lchmod(path, mode & CHMOD_BITS);
350: #else
351: if (S_ISLNK(mode)) {
352: # if defined HAVE_SETATTRLIST
353: struct attrlist attrList;
354: uint32_t m = mode & CHMOD_BITS; /* manpage is wrong: not mode_t! */
355:
356: memset(&attrList, 0, sizeof attrList);
357: attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
358: attrList.commonattr = ATTR_CMN_ACCESSMASK;
359: code = setattrlist(path, &attrList, &m, sizeof m, FSOPT_NOFOLLOW);
360: # else
361: code = 1;
362: # endif
363: } else
364: code = chmod(path, mode & CHMOD_BITS); /* DISCOURAGED FUNCTION */
365: #endif /* !HAVE_LCHMOD */
1.1.1.4 ! misho 366: #ifdef SUPPORT_FORCE_CHANGE
! 367: if (code < 0 && force_change && errno == EPERM && !S_ISLNK(mode)) {
! 368: if (fileflags == NO_FFLAGS) {
! 369: STRUCT_STAT st;
! 370: if (x_lstat(path, &st, NULL) == 0)
! 371: fileflags = st.st_flags;
! 372: }
! 373: if (fileflags != NO_FFLAGS
! 374: && make_mutable(path, mode, fileflags, force_change) > 0) {
! 375: code = chmod(path, mode & CHMOD_BITS);
! 376: undo_make_mutable(path, fileflags);
! 377: if (code == 0)
! 378: return 0;
! 379: }
! 380: errno = EPERM;
! 381: }
! 382: #endif
1.1 misho 383: if (code != 0 && (preserve_perms || preserve_executability))
384: return code;
385: return 0;
386: }
387: #endif
388:
1.1.1.4 ! misho 389: #ifdef HAVE_CHFLAGS
! 390: int do_chflags(const char *path, uint32 fileflags)
1.1 misho 391: {
392: if (dry_run) return 0;
393: RETURN_ERROR_IF_RO_OR_LO;
1.1.1.4 ! misho 394: return chflags(path, fileflags);
! 395: }
! 396: #endif
! 397:
! 398: int do_rename(const char *old_path, const char *new_path)
! 399: {
! 400: if (dry_run) return 0;
! 401: RETURN_ERROR_IF_RO_OR_LO;
! 402: if (rename(old_path, new_path) == 0)
! 403: return 0;
! 404: #ifdef SUPPORT_FORCE_CHANGE
! 405: if (force_change && errno == EPERM) {
! 406: STRUCT_STAT st1, st2;
! 407: int became_mutable;
! 408:
! 409: if (x_lstat(old_path, &st1, NULL) != 0)
! 410: goto failed;
! 411: became_mutable = make_mutable(old_path, st1.st_mode, st1.st_flags, force_change) > 0;
! 412: if (became_mutable && rename(old_path, new_path) == 0)
! 413: goto success;
! 414: if (x_lstat(new_path, &st2, NULL) == 0
! 415: && make_mutable(new_path, st2.st_mode, st2.st_flags, force_change) > 0) {
! 416: if (rename(old_path, new_path) == 0) {
! 417: success:
! 418: if (became_mutable) /* Yes, use new_path and st1! */
! 419: undo_make_mutable(new_path, st1.st_flags);
! 420: return 0;
! 421: }
! 422: undo_make_mutable(new_path, st2.st_flags);
! 423: }
! 424: /* TODO: handle immutable directories */
! 425: if (became_mutable)
! 426: undo_make_mutable(old_path, st1.st_flags);
! 427: failed:
! 428: errno = EPERM;
! 429: }
! 430: #endif
! 431: return -1;
1.1 misho 432: }
433:
434: #ifdef HAVE_FTRUNCATE
435: int do_ftruncate(int fd, OFF_T size)
436: {
437: int ret;
438:
439: if (dry_run) return 0;
440: RETURN_ERROR_IF_RO_OR_LO;
441:
442: do {
443: ret = ftruncate(fd, size);
444: } while (ret < 0 && errno == EINTR);
445:
446: return ret;
447: }
448: #endif
449:
450: void trim_trailing_slashes(char *name)
451: {
452: int l;
453: /* Some BSD systems cannot make a directory if the name
454: * contains a trailing slash.
455: * <http://www.opensource.apple.com/bugs/X/BSD%20Kernel/2734739.html> */
456:
457: /* Don't change empty string; and also we can't improve on
458: * "/" */
459:
460: l = strlen(name);
461: while (l > 1) {
462: if (name[--l] != '/')
463: break;
464: name[l] = '\0';
465: }
466: }
467:
468: int do_mkdir(char *fname, mode_t mode)
469: {
470: if (dry_run) return 0;
471: RETURN_ERROR_IF_RO_OR_LO;
472: trim_trailing_slashes(fname);
473: return mkdir(fname, mode);
474: }
475:
476: /* like mkstemp but forces permissions */
477: int do_mkstemp(char *template, mode_t perms)
478: {
479: RETURN_ERROR_IF(dry_run, 0);
480: RETURN_ERROR_IF(read_only, EROFS);
481: perms |= S_IWUSR;
482:
483: #if defined HAVE_SECURE_MKSTEMP && defined HAVE_FCHMOD && (!defined HAVE_OPEN64 || defined HAVE_MKSTEMP64)
484: {
485: int fd = mkstemp(template);
486: if (fd == -1)
487: return -1;
488: if (fchmod(fd, perms) != 0 && preserve_perms) {
489: int errno_save = errno;
490: close(fd);
491: unlink(template);
492: errno = errno_save;
493: return -1;
494: }
495: #if defined HAVE_SETMODE && O_BINARY
496: setmode(fd, O_BINARY);
497: #endif
498: return fd;
499: }
500: #else
501: if (!mktemp(template))
502: return -1;
503: return do_open(template, O_RDWR|O_EXCL|O_CREAT, perms);
504: #endif
505: }
506:
507: int do_stat(const char *fname, STRUCT_STAT *st)
508: {
509: #ifdef USE_STAT64_FUNCS
510: return stat64(fname, st);
511: #else
512: return stat(fname, st);
513: #endif
514: }
515:
516: int do_lstat(const char *fname, STRUCT_STAT *st)
517: {
518: #ifdef SUPPORT_LINKS
519: # ifdef USE_STAT64_FUNCS
520: return lstat64(fname, st);
521: # else
522: return lstat(fname, st);
523: # endif
524: #else
525: return do_stat(fname, st);
526: #endif
527: }
528:
529: int do_fstat(int fd, STRUCT_STAT *st)
530: {
531: #ifdef USE_STAT64_FUNCS
532: return fstat64(fd, st);
533: #else
534: return fstat(fd, st);
535: #endif
536: }
537:
538: OFF_T do_lseek(int fd, OFF_T offset, int whence)
539: {
540: #ifdef HAVE_LSEEK64
541: #if !SIZEOF_OFF64_T
542: OFF_T lseek64();
543: #else
544: off64_t lseek64();
545: #endif
546: return lseek64(fd, offset, whence);
547: #else
548: return lseek(fd, offset, whence);
549: #endif
550: }
551:
1.1.1.4 ! misho 552: #ifdef HAVE_SETATTRLIST
! 553: int do_setattrlist_times(const char *fname, STRUCT_STAT *stp)
! 554: {
! 555: struct attrlist attrList;
! 556: struct timespec ts;
! 557:
! 558: if (dry_run) return 0;
! 559: RETURN_ERROR_IF_RO_OR_LO;
! 560:
! 561: ts.tv_sec = stp->st_mtime;
! 562: ts.tv_nsec = stp->ST_MTIME_NSEC;
! 563:
! 564: memset(&attrList, 0, sizeof attrList);
! 565: attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
! 566: attrList.commonattr = ATTR_CMN_MODTIME;
! 567: return setattrlist(fname, &attrList, &ts, sizeof ts, FSOPT_NOFOLLOW);
! 568: }
! 569: #endif
! 570:
! 571: #ifdef SUPPORT_CRTIMES
! 572: time_t get_create_time(const char *path)
! 573: {
! 574: static struct create_time attrBuf;
! 575: struct attrlist attrList;
! 576:
! 577: memset(&attrList, 0, sizeof attrList);
! 578: attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
! 579: attrList.commonattr = ATTR_CMN_CRTIME;
! 580: if (getattrlist(path, &attrList, &attrBuf, sizeof attrBuf, FSOPT_NOFOLLOW) < 0)
! 581: return 0;
! 582: return attrBuf.crtime.tv_sec;
! 583: }
! 584: #endif
! 585:
! 586: #ifdef SUPPORT_CRTIMES
! 587: int set_create_time(const char *path, time_t crtime)
! 588: {
! 589: struct attrlist attrList;
! 590: struct timespec ts;
! 591:
! 592: if (dry_run) return 0;
! 593: RETURN_ERROR_IF_RO_OR_LO;
! 594:
! 595: ts.tv_sec = crtime;
! 596: ts.tv_nsec = 0;
! 597:
! 598: memset(&attrList, 0, sizeof attrList);
! 599: attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
! 600: attrList.commonattr = ATTR_CMN_CRTIME;
! 601: return setattrlist(path, &attrList, &ts, sizeof ts, FSOPT_NOFOLLOW);
! 602: }
! 603: #endif
! 604:
1.1 misho 605: #ifdef HAVE_UTIMENSAT
1.1.1.4 ! misho 606: int do_utimensat(const char *fname, STRUCT_STAT *stp)
1.1 misho 607: {
608: struct timespec t[2];
609:
610: if (dry_run) return 0;
611: RETURN_ERROR_IF_RO_OR_LO;
612:
1.1.1.4 ! misho 613: t[0].tv_sec = stp->st_atime;
! 614: #ifdef ST_ATIME_NSEC
! 615: t[0].tv_nsec = stp->ST_ATIME_NSEC;
! 616: #else
! 617: t[0].tv_nsec = 0;
! 618: #endif
! 619: t[1].tv_sec = stp->st_mtime;
! 620: #ifdef ST_MTIME_NSEC
! 621: t[1].tv_nsec = stp->ST_MTIME_NSEC;
! 622: #else
! 623: t[1].tv_nsec = 0;
! 624: #endif
1.1 misho 625: return utimensat(AT_FDCWD, fname, t, AT_SYMLINK_NOFOLLOW);
626: }
627: #endif
628:
629: #ifdef HAVE_LUTIMES
1.1.1.4 ! misho 630: int do_lutimes(const char *fname, STRUCT_STAT *stp)
1.1 misho 631: {
632: struct timeval t[2];
633:
634: if (dry_run) return 0;
635: RETURN_ERROR_IF_RO_OR_LO;
636:
1.1.1.4 ! misho 637: t[0].tv_sec = stp->st_atime;
! 638: #ifdef ST_ATIME_NSEC
! 639: t[0].tv_usec = stp->ST_ATIME_NSEC / 1000;
! 640: #else
1.1 misho 641: t[0].tv_usec = 0;
1.1.1.4 ! misho 642: #endif
! 643: t[1].tv_sec = stp->st_mtime;
! 644: #ifdef ST_MTIME_NSEC
! 645: t[1].tv_usec = stp->ST_MTIME_NSEC / 1000;
! 646: #else
! 647: t[1].tv_usec = 0;
! 648: #endif
1.1 misho 649: return lutimes(fname, t);
650: }
651: #endif
652:
653: #ifdef HAVE_UTIMES
1.1.1.4 ! misho 654: int do_utimes(const char *fname, STRUCT_STAT *stp)
1.1 misho 655: {
656: struct timeval t[2];
657:
658: if (dry_run) return 0;
659: RETURN_ERROR_IF_RO_OR_LO;
660:
1.1.1.4 ! misho 661: t[0].tv_sec = stp->st_atime;
! 662: #ifdef ST_ATIME_NSEC
! 663: t[0].tv_usec = stp->ST_ATIME_NSEC / 1000;
! 664: #else
1.1 misho 665: t[0].tv_usec = 0;
1.1.1.4 ! misho 666: #endif
! 667: t[1].tv_sec = stp->st_mtime;
! 668: #ifdef ST_MTIME_NSEC
! 669: t[1].tv_usec = stp->ST_MTIME_NSEC / 1000;
! 670: #else
! 671: t[1].tv_usec = 0;
! 672: #endif
1.1 misho 673: return utimes(fname, t);
674: }
675:
676: #elif defined HAVE_UTIME
1.1.1.4 ! misho 677: int do_utime(const char *fname, STRUCT_STAT *stp)
1.1 misho 678: {
679: #ifdef HAVE_STRUCT_UTIMBUF
680: struct utimbuf tbuf;
681: #else
682: time_t t[2];
683: #endif
684:
685: if (dry_run) return 0;
686: RETURN_ERROR_IF_RO_OR_LO;
687:
688: # ifdef HAVE_STRUCT_UTIMBUF
1.1.1.4 ! misho 689: tbuf.actime = stp->st_atime;
! 690: tbuf.modtime = stp->st_mtime;
1.1 misho 691: return utime(fname, &tbuf);
692: # else
1.1.1.4 ! misho 693: t[0] = stp->st_atime;
! 694: t[1] = stp->st_mtime;
1.1 misho 695: return utime(fname, t);
696: # endif
697: }
698:
699: #else
700: #error Need utimes or utime function.
701: #endif
1.1.1.2 misho 702:
703: #ifdef SUPPORT_PREALLOCATION
704: #ifdef FALLOC_FL_KEEP_SIZE
705: #define DO_FALLOC_OPTIONS FALLOC_FL_KEEP_SIZE
706: #else
707: #define DO_FALLOC_OPTIONS 0
708: #endif
1.1.1.4 ! misho 709:
! 710: OFF_T do_fallocate(int fd, OFF_T offset, OFF_T length)
! 711: {
! 712: int opts = inplace || preallocate_files ? DO_FALLOC_OPTIONS : 0;
! 713: int ret;
1.1.1.2 misho 714: RETURN_ERROR_IF(dry_run, 0);
715: RETURN_ERROR_IF_RO_OR_LO;
1.1.1.4 ! misho 716: if (length & 1) /* make the length not match the desired length */
! 717: length++;
! 718: else
! 719: length--;
1.1.1.2 misho 720: #if defined HAVE_FALLOCATE
1.1.1.4 ! misho 721: ret = fallocate(fd, opts, offset, length);
1.1.1.2 misho 722: #elif defined HAVE_SYS_FALLOCATE
1.1.1.4 ! misho 723: ret = syscall(SYS_fallocate, fd, opts, (loff_t)offset, (loff_t)length);
1.1.1.2 misho 724: #elif defined HAVE_EFFICIENT_POSIX_FALLOCATE
1.1.1.4 ! misho 725: ret = posix_fallocate(fd, offset, length);
1.1.1.2 misho 726: #else
727: #error Coding error in SUPPORT_PREALLOCATION logic.
728: #endif
1.1.1.4 ! misho 729: if (ret < 0)
! 730: return ret;
! 731: if (opts == 0) {
! 732: STRUCT_STAT st;
! 733: if (do_fstat(fd, &st) < 0)
! 734: return length;
! 735: return st.st_blocks * S_BLKSIZE;
! 736: }
! 737: return 0;
1.1.1.2 misho 738: }
739: #endif
740:
1.1.1.4 ! misho 741: /* Punch a hole at pos for len bytes. The current file position must be at pos and will be
! 742: * changed to be at pos + len. */
! 743: int do_punch_hole(int fd, OFF_T pos, OFF_T len)
! 744: {
! 745: #ifdef HAVE_FALLOCATE
! 746: # ifdef HAVE_FALLOC_FL_PUNCH_HOLE
! 747: if (fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, pos, len) == 0) {
! 748: if (do_lseek(fd, len, SEEK_CUR) != pos + len)
! 749: return -1;
! 750: return 0;
! 751: }
! 752: # endif
! 753: # ifdef HAVE_FALLOC_FL_ZERO_RANGE
! 754: if (fallocate(fd, FALLOC_FL_ZERO_RANGE, pos, len) == 0) {
! 755: if (do_lseek(fd, len, SEEK_CUR) != pos + len)
! 756: return -1;
! 757: return 0;
! 758: }
! 759: # endif
! 760: #else
! 761: (void)pos;
! 762: #endif
! 763: {
! 764: char zeros[4096];
! 765: memset(zeros, 0, sizeof zeros);
! 766: while (len > 0) {
! 767: int chunk = len > (int)sizeof zeros ? (int)sizeof zeros : len;
! 768: int wrote = write(fd, zeros, chunk);
! 769: if (wrote <= 0) {
! 770: if (wrote < 0 && errno == EINTR)
! 771: continue;
! 772: return -1;
! 773: }
! 774: len -= wrote;
! 775: }
! 776: }
! 777: return 0;
! 778: }
! 779:
1.1.1.2 misho 780: int do_open_nofollow(const char *pathname, int flags)
781: {
782: #ifndef O_NOFOLLOW
783: STRUCT_STAT f_st, l_st;
784: #endif
785: int fd;
786:
787: if (flags != O_RDONLY) {
788: RETURN_ERROR_IF(dry_run, 0);
789: RETURN_ERROR_IF_RO_OR_LO;
790: #ifndef O_NOFOLLOW
791: /* This function doesn't support write attempts w/o O_NOFOLLOW. */
792: errno = EINVAL;
793: return -1;
794: #endif
795: }
796:
1.1.1.4 ! misho 797: if (direct_io)
! 798: flags |= O_DIRECT;
! 799:
1.1.1.2 misho 800: #ifdef O_NOFOLLOW
801: fd = open(pathname, flags|O_NOFOLLOW);
802: #else
803: if (do_lstat(pathname, &l_st) < 0)
804: return -1;
805: if (S_ISLNK(l_st.st_mode)) {
806: errno = ELOOP;
807: return -1;
808: }
809: if ((fd = open(pathname, flags)) < 0)
810: return fd;
811: if (do_fstat(fd, &f_st) < 0) {
812: close_and_return_error:
813: {
814: int save_errno = errno;
815: close(fd);
816: errno = save_errno;
817: }
818: return -1;
819: }
820: if (l_st.st_dev != f_st.st_dev || l_st.st_ino != f_st.st_ino) {
821: errno = EINVAL;
822: goto close_and_return_error;
823: }
824: #endif
825:
826: return fd;
827: }
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