| 1 | /* Set file access and modification times. |
| 2 | |
| 3 | Copyright (C) 2003-2014 Free Software Foundation, Inc. |
| 4 | |
| 5 | This program is free software: you can redistribute it and/or modify it |
| 6 | under the terms of the GNU General Public License as published by the |
| 7 | Free Software Foundation; either version 3 of the License, or any |
| 8 | later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | /* Written by Paul Eggert. */ |
| 19 | |
| 20 | /* derived from a function in touch.c */ |
| 21 | |
| 22 | #include <config.h> |
| 23 | |
| 24 | #define _GL_UTIMENS_INLINE _GL_EXTERN_INLINE |
| 25 | #include "utimens.h" |
| 26 | |
| 27 | #include <assert.h> |
| 28 | #include <errno.h> |
| 29 | #include <fcntl.h> |
| 30 | #include <stdbool.h> |
| 31 | #include <sys/stat.h> |
| 32 | #include <sys/time.h> |
| 33 | #include <unistd.h> |
| 34 | |
| 35 | #include "stat-time.h" |
| 36 | #include "timespec.h" |
| 37 | |
| 38 | #if HAVE_UTIME_H |
| 39 | # include <utime.h> |
| 40 | #endif |
| 41 | |
| 42 | /* Some systems (even some that do have <utime.h>) don't declare this |
| 43 | structure anywhere. */ |
| 44 | #ifndef HAVE_STRUCT_UTIMBUF |
| 45 | struct utimbuf |
| 46 | { |
| 47 | long actime; |
| 48 | long modtime; |
| 49 | }; |
| 50 | #endif |
| 51 | |
| 52 | /* Avoid recursion with rpl_futimens or rpl_utimensat. */ |
| 53 | #undef futimens |
| 54 | #undef utimensat |
| 55 | |
| 56 | /* Solaris 9 mistakenly succeeds when given a non-directory with a |
| 57 | trailing slash. Force the use of rpl_stat for a fix. */ |
| 58 | #ifndef REPLACE_FUNC_STAT_FILE |
| 59 | # define REPLACE_FUNC_STAT_FILE 0 |
| 60 | #endif |
| 61 | |
| 62 | #if HAVE_UTIMENSAT || HAVE_FUTIMENS |
| 63 | /* Cache variables for whether the utimensat syscall works; used to |
| 64 | avoid calling the syscall if we know it will just fail with ENOSYS, |
| 65 | and to avoid unnecessary work in massaging timestamps if the |
| 66 | syscall will work. Multiple variables are needed, to distinguish |
| 67 | between the following scenarios on Linux: |
| 68 | utimensat doesn't exist, or is in glibc but kernel 2.6.18 fails with ENOSYS |
| 69 | kernel 2.6.22 and earlier rejects AT_SYMLINK_NOFOLLOW |
| 70 | kernel 2.6.25 and earlier reject UTIME_NOW/UTIME_OMIT with non-zero tv_sec |
| 71 | kernel 2.6.32 used with xfs or ntfs-3g fail to honor UTIME_OMIT |
| 72 | utimensat completely works |
| 73 | For each cache variable: 0 = unknown, 1 = yes, -1 = no. */ |
| 74 | static int utimensat_works_really; |
| 75 | static int lutimensat_works_really; |
| 76 | #endif /* HAVE_UTIMENSAT || HAVE_FUTIMENS */ |
| 77 | |
| 78 | /* Validate the requested timestamps. Return 0 if the resulting |
| 79 | timespec can be used for utimensat (after possibly modifying it to |
| 80 | work around bugs in utimensat). Return a positive value if the |
| 81 | timespec needs further adjustment based on stat results: 1 if any |
| 82 | adjustment is needed for utimes, and 2 if any adjustment is needed |
| 83 | for Linux utimensat. Return -1, with errno set to EINVAL, if |
| 84 | timespec is out of range. */ |
| 85 | static int |
| 86 | validate_timespec (struct timespec timespec[2]) |
| 87 | { |
| 88 | int result = 0; |
| 89 | int utime_omit_count = 0; |
| 90 | assert (timespec); |
| 91 | if ((timespec[0].tv_nsec != UTIME_NOW |
| 92 | && timespec[0].tv_nsec != UTIME_OMIT |
| 93 | && ! (0 <= timespec[0].tv_nsec |
| 94 | && timespec[0].tv_nsec < TIMESPEC_RESOLUTION)) |
| 95 | || (timespec[1].tv_nsec != UTIME_NOW |
| 96 | && timespec[1].tv_nsec != UTIME_OMIT |
| 97 | && ! (0 <= timespec[1].tv_nsec |
| 98 | && timespec[1].tv_nsec < TIMESPEC_RESOLUTION))) |
| 99 | { |
| 100 | errno = EINVAL; |
| 101 | return -1; |
| 102 | } |
| 103 | /* Work around Linux kernel 2.6.25 bug, where utimensat fails with |
| 104 | EINVAL if tv_sec is not 0 when using the flag values of tv_nsec. |
| 105 | Flag a Linux kernel 2.6.32 bug, where an mtime of UTIME_OMIT |
| 106 | fails to bump ctime. */ |
| 107 | if (timespec[0].tv_nsec == UTIME_NOW |
| 108 | || timespec[0].tv_nsec == UTIME_OMIT) |
| 109 | { |
| 110 | timespec[0].tv_sec = 0; |
| 111 | result = 1; |
| 112 | if (timespec[0].tv_nsec == UTIME_OMIT) |
| 113 | utime_omit_count++; |
| 114 | } |
| 115 | if (timespec[1].tv_nsec == UTIME_NOW |
| 116 | || timespec[1].tv_nsec == UTIME_OMIT) |
| 117 | { |
| 118 | timespec[1].tv_sec = 0; |
| 119 | result = 1; |
| 120 | if (timespec[1].tv_nsec == UTIME_OMIT) |
| 121 | utime_omit_count++; |
| 122 | } |
| 123 | return result + (utime_omit_count == 1); |
| 124 | } |
| 125 | |
| 126 | /* Normalize any UTIME_NOW or UTIME_OMIT values in *TS, using stat |
| 127 | buffer STATBUF to obtain the current timestamps of the file. If |
| 128 | both times are UTIME_NOW, set *TS to NULL (as this can avoid some |
| 129 | permissions issues). If both times are UTIME_OMIT, return true |
| 130 | (nothing further beyond the prior collection of STATBUF is |
| 131 | necessary); otherwise return false. */ |
| 132 | static bool |
| 133 | update_timespec (struct stat const *statbuf, struct timespec *ts[2]) |
| 134 | { |
| 135 | struct timespec *timespec = *ts; |
| 136 | if (timespec[0].tv_nsec == UTIME_OMIT |
| 137 | && timespec[1].tv_nsec == UTIME_OMIT) |
| 138 | return true; |
| 139 | if (timespec[0].tv_nsec == UTIME_NOW |
| 140 | && timespec[1].tv_nsec == UTIME_NOW) |
| 141 | { |
| 142 | *ts = NULL; |
| 143 | return false; |
| 144 | } |
| 145 | |
| 146 | if (timespec[0].tv_nsec == UTIME_OMIT) |
| 147 | timespec[0] = get_stat_atime (statbuf); |
| 148 | else if (timespec[0].tv_nsec == UTIME_NOW) |
| 149 | gettime (×pec[0]); |
| 150 | |
| 151 | if (timespec[1].tv_nsec == UTIME_OMIT) |
| 152 | timespec[1] = get_stat_mtime (statbuf); |
| 153 | else if (timespec[1].tv_nsec == UTIME_NOW) |
| 154 | gettime (×pec[1]); |
| 155 | |
| 156 | return false; |
| 157 | } |
| 158 | |
| 159 | /* Set the access and modification time stamps of FD (a.k.a. FILE) to be |
| 160 | TIMESPEC[0] and TIMESPEC[1], respectively. |
| 161 | FD must be either negative -- in which case it is ignored -- |
| 162 | or a file descriptor that is open on FILE. |
| 163 | If FD is nonnegative, then FILE can be NULL, which means |
| 164 | use just futimes (or equivalent) instead of utimes (or equivalent), |
| 165 | and fail if on an old system without futimes (or equivalent). |
| 166 | If TIMESPEC is null, set the time stamps to the current time. |
| 167 | Return 0 on success, -1 (setting errno) on failure. */ |
| 168 | |
| 169 | int |
| 170 | fdutimens (int fd, char const *file, struct timespec const timespec[2]) |
| 171 | { |
| 172 | struct timespec adjusted_timespec[2]; |
| 173 | struct timespec *ts = timespec ? adjusted_timespec : NULL; |
| 174 | int adjustment_needed = 0; |
| 175 | struct stat st; |
| 176 | |
| 177 | if (ts) |
| 178 | { |
| 179 | adjusted_timespec[0] = timespec[0]; |
| 180 | adjusted_timespec[1] = timespec[1]; |
| 181 | adjustment_needed = validate_timespec (ts); |
| 182 | } |
| 183 | if (adjustment_needed < 0) |
| 184 | return -1; |
| 185 | |
| 186 | /* Require that at least one of FD or FILE are potentially valid, to avoid |
| 187 | a Linux bug where futimens (AT_FDCWD, NULL) changes "." rather |
| 188 | than failing. */ |
| 189 | if (fd < 0 && !file) |
| 190 | { |
| 191 | errno = EBADF; |
| 192 | return -1; |
| 193 | } |
| 194 | |
| 195 | /* Some Linux-based NFS clients are buggy, and mishandle time stamps |
| 196 | of files in NFS file systems in some cases. We have no |
| 197 | configure-time test for this, but please see |
| 198 | <http://bugs.gentoo.org/show_bug.cgi?id=132673> for references to |
| 199 | some of the problems with Linux 2.6.16. If this affects you, |
| 200 | compile with -DHAVE_BUGGY_NFS_TIME_STAMPS; this is reported to |
| 201 | help in some cases, albeit at a cost in performance. But you |
| 202 | really should upgrade your kernel to a fixed version, since the |
| 203 | problem affects many applications. */ |
| 204 | |
| 205 | #if HAVE_BUGGY_NFS_TIME_STAMPS |
| 206 | if (fd < 0) |
| 207 | sync (); |
| 208 | else |
| 209 | fsync (fd); |
| 210 | #endif |
| 211 | |
| 212 | /* POSIX 2008 added two interfaces to set file timestamps with |
| 213 | nanosecond resolution; newer Linux implements both functions via |
| 214 | a single syscall. We provide a fallback for ENOSYS (for example, |
| 215 | compiling against Linux 2.6.25 kernel headers and glibc 2.7, but |
| 216 | running on Linux 2.6.18 kernel). */ |
| 217 | #if HAVE_UTIMENSAT || HAVE_FUTIMENS |
| 218 | if (0 <= utimensat_works_really) |
| 219 | { |
| 220 | int result; |
| 221 | # if __linux__ || __sun |
| 222 | /* As recently as Linux kernel 2.6.32 (Dec 2009), several file |
| 223 | systems (xfs, ntfs-3g) have bugs with a single UTIME_OMIT, |
| 224 | but work if both times are either explicitly specified or |
| 225 | UTIME_NOW. Work around it with a preparatory [f]stat prior |
| 226 | to calling futimens/utimensat; fortunately, there is not much |
| 227 | timing impact due to the extra syscall even on file systems |
| 228 | where UTIME_OMIT would have worked. |
| 229 | |
| 230 | The same bug occurs in Solaris 11.1 (Apr 2013). |
| 231 | |
| 232 | FIXME: Simplify this for Linux in 2016 and for Solaris in |
| 233 | 2024, when file system bugs are no longer common. */ |
| 234 | if (adjustment_needed == 2) |
| 235 | { |
| 236 | if (fd < 0 ? stat (file, &st) : fstat (fd, &st)) |
| 237 | return -1; |
| 238 | if (ts[0].tv_nsec == UTIME_OMIT) |
| 239 | ts[0] = get_stat_atime (&st); |
| 240 | else if (ts[1].tv_nsec == UTIME_OMIT) |
| 241 | ts[1] = get_stat_mtime (&st); |
| 242 | /* Note that st is good, in case utimensat gives ENOSYS. */ |
| 243 | adjustment_needed++; |
| 244 | } |
| 245 | # endif |
| 246 | # if HAVE_UTIMENSAT |
| 247 | if (fd < 0) |
| 248 | { |
| 249 | result = utimensat (AT_FDCWD, file, ts, 0); |
| 250 | # ifdef __linux__ |
| 251 | /* Work around a kernel bug: |
| 252 | http://bugzilla.redhat.com/442352 |
| 253 | http://bugzilla.redhat.com/449910 |
| 254 | It appears that utimensat can mistakenly return 280 rather |
| 255 | than -1 upon ENOSYS failure. |
| 256 | FIXME: remove in 2010 or whenever the offending kernels |
| 257 | are no longer in common use. */ |
| 258 | if (0 < result) |
| 259 | errno = ENOSYS; |
| 260 | # endif /* __linux__ */ |
| 261 | if (result == 0 || errno != ENOSYS) |
| 262 | { |
| 263 | utimensat_works_really = 1; |
| 264 | return result; |
| 265 | } |
| 266 | } |
| 267 | # endif /* HAVE_UTIMENSAT */ |
| 268 | # if HAVE_FUTIMENS |
| 269 | if (0 <= fd) |
| 270 | { |
| 271 | result = futimens (fd, ts); |
| 272 | # ifdef __linux__ |
| 273 | /* Work around the same bug as above. */ |
| 274 | if (0 < result) |
| 275 | errno = ENOSYS; |
| 276 | # endif /* __linux__ */ |
| 277 | if (result == 0 || errno != ENOSYS) |
| 278 | { |
| 279 | utimensat_works_really = 1; |
| 280 | return result; |
| 281 | } |
| 282 | } |
| 283 | # endif /* HAVE_FUTIMENS */ |
| 284 | } |
| 285 | utimensat_works_really = -1; |
| 286 | lutimensat_works_really = -1; |
| 287 | #endif /* HAVE_UTIMENSAT || HAVE_FUTIMENS */ |
| 288 | |
| 289 | /* The platform lacks an interface to set file timestamps with |
| 290 | nanosecond resolution, so do the best we can, discarding any |
| 291 | fractional part of the timestamp. */ |
| 292 | |
| 293 | if (adjustment_needed || (REPLACE_FUNC_STAT_FILE && fd < 0)) |
| 294 | { |
| 295 | if (adjustment_needed != 3 |
| 296 | && (fd < 0 ? stat (file, &st) : fstat (fd, &st))) |
| 297 | return -1; |
| 298 | if (ts && update_timespec (&st, &ts)) |
| 299 | return 0; |
| 300 | } |
| 301 | |
| 302 | { |
| 303 | #if HAVE_FUTIMESAT || HAVE_WORKING_UTIMES |
| 304 | struct timeval timeval[2]; |
| 305 | struct timeval *t; |
| 306 | if (ts) |
| 307 | { |
| 308 | timeval[0].tv_sec = ts[0].tv_sec; |
| 309 | timeval[0].tv_usec = ts[0].tv_nsec / 1000; |
| 310 | timeval[1].tv_sec = ts[1].tv_sec; |
| 311 | timeval[1].tv_usec = ts[1].tv_nsec / 1000; |
| 312 | t = timeval; |
| 313 | } |
| 314 | else |
| 315 | t = NULL; |
| 316 | |
| 317 | if (fd < 0) |
| 318 | { |
| 319 | # if HAVE_FUTIMESAT |
| 320 | return futimesat (AT_FDCWD, file, t); |
| 321 | # endif |
| 322 | } |
| 323 | else |
| 324 | { |
| 325 | /* If futimesat or futimes fails here, don't try to speed things |
| 326 | up by returning right away. glibc can incorrectly fail with |
| 327 | errno == ENOENT if /proc isn't mounted. Also, Mandrake 10.0 |
| 328 | in high security mode doesn't allow ordinary users to read |
| 329 | /proc/self, so glibc incorrectly fails with errno == EACCES. |
| 330 | If errno == EIO, EPERM, or EROFS, it's probably safe to fail |
| 331 | right away, but these cases are rare enough that they're not |
| 332 | worth optimizing, and who knows what other messed-up systems |
| 333 | are out there? So play it safe and fall back on the code |
| 334 | below. */ |
| 335 | |
| 336 | # if (HAVE_FUTIMESAT && !FUTIMESAT_NULL_BUG) || HAVE_FUTIMES |
| 337 | # if HAVE_FUTIMESAT && !FUTIMESAT_NULL_BUG |
| 338 | # undef futimes |
| 339 | # define futimes(fd, t) futimesat (fd, NULL, t) |
| 340 | # endif |
| 341 | if (futimes (fd, t) == 0) |
| 342 | { |
| 343 | # if __linux__ && __GLIBC__ |
| 344 | /* Work around a longstanding glibc bug, still present as |
| 345 | of 2010-12-27. On older Linux kernels that lack both |
| 346 | utimensat and utimes, glibc's futimes rounds instead of |
| 347 | truncating when falling back on utime. The same bug |
| 348 | occurs in futimesat with a null 2nd arg. */ |
| 349 | if (t) |
| 350 | { |
| 351 | bool abig = 500000 <= t[0].tv_usec; |
| 352 | bool mbig = 500000 <= t[1].tv_usec; |
| 353 | if ((abig | mbig) && fstat (fd, &st) == 0) |
| 354 | { |
| 355 | /* If these two subtractions overflow, they'll |
| 356 | track the overflows inside the buggy glibc. */ |
| 357 | time_t adiff = st.st_atime - t[0].tv_sec; |
| 358 | time_t mdiff = st.st_mtime - t[1].tv_sec; |
| 359 | |
| 360 | struct timeval *tt = NULL; |
| 361 | struct timeval truncated_timeval[2]; |
| 362 | truncated_timeval[0] = t[0]; |
| 363 | truncated_timeval[1] = t[1]; |
| 364 | if (abig && adiff == 1 && get_stat_atime_ns (&st) == 0) |
| 365 | { |
| 366 | tt = truncated_timeval; |
| 367 | tt[0].tv_usec = 0; |
| 368 | } |
| 369 | if (mbig && mdiff == 1 && get_stat_mtime_ns (&st) == 0) |
| 370 | { |
| 371 | tt = truncated_timeval; |
| 372 | tt[1].tv_usec = 0; |
| 373 | } |
| 374 | if (tt) |
| 375 | futimes (fd, tt); |
| 376 | } |
| 377 | } |
| 378 | # endif |
| 379 | |
| 380 | return 0; |
| 381 | } |
| 382 | # endif |
| 383 | } |
| 384 | #endif /* HAVE_FUTIMESAT || HAVE_WORKING_UTIMES */ |
| 385 | |
| 386 | if (!file) |
| 387 | { |
| 388 | #if ! ((HAVE_FUTIMESAT && !FUTIMESAT_NULL_BUG) \ |
| 389 | || (HAVE_WORKING_UTIMES && HAVE_FUTIMES)) |
| 390 | errno = ENOSYS; |
| 391 | #endif |
| 392 | return -1; |
| 393 | } |
| 394 | |
| 395 | #if HAVE_WORKING_UTIMES |
| 396 | return utimes (file, t); |
| 397 | #else |
| 398 | { |
| 399 | struct utimbuf utimbuf; |
| 400 | struct utimbuf *ut; |
| 401 | if (ts) |
| 402 | { |
| 403 | utimbuf.actime = ts[0].tv_sec; |
| 404 | utimbuf.modtime = ts[1].tv_sec; |
| 405 | ut = &utimbuf; |
| 406 | } |
| 407 | else |
| 408 | ut = NULL; |
| 409 | |
| 410 | return utime (file, ut); |
| 411 | } |
| 412 | #endif /* !HAVE_WORKING_UTIMES */ |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | /* Set the access and modification time stamps of FILE to be |
| 417 | TIMESPEC[0] and TIMESPEC[1], respectively. */ |
| 418 | int |
| 419 | utimens (char const *file, struct timespec const timespec[2]) |
| 420 | { |
| 421 | return fdutimens (-1, file, timespec); |
| 422 | } |
| 423 | |
| 424 | /* Set the access and modification time stamps of FILE to be |
| 425 | TIMESPEC[0] and TIMESPEC[1], respectively, without dereferencing |
| 426 | symlinks. Fail with ENOSYS if the platform does not support |
| 427 | changing symlink timestamps, but FILE was a symlink. */ |
| 428 | int |
| 429 | lutimens (char const *file, struct timespec const timespec[2]) |
| 430 | { |
| 431 | struct timespec adjusted_timespec[2]; |
| 432 | struct timespec *ts = timespec ? adjusted_timespec : NULL; |
| 433 | int adjustment_needed = 0; |
| 434 | struct stat st; |
| 435 | |
| 436 | if (ts) |
| 437 | { |
| 438 | adjusted_timespec[0] = timespec[0]; |
| 439 | adjusted_timespec[1] = timespec[1]; |
| 440 | adjustment_needed = validate_timespec (ts); |
| 441 | } |
| 442 | if (adjustment_needed < 0) |
| 443 | return -1; |
| 444 | |
| 445 | /* The Linux kernel did not support symlink timestamps until |
| 446 | utimensat, in version 2.6.22, so we don't need to mimic |
| 447 | fdutimens' worry about buggy NFS clients. But we do have to |
| 448 | worry about bogus return values. */ |
| 449 | |
| 450 | #if HAVE_UTIMENSAT |
| 451 | if (0 <= lutimensat_works_really) |
| 452 | { |
| 453 | int result; |
| 454 | # if __linux__ || __sun |
| 455 | /* As recently as Linux kernel 2.6.32 (Dec 2009), several file |
| 456 | systems (xfs, ntfs-3g) have bugs with a single UTIME_OMIT, |
| 457 | but work if both times are either explicitly specified or |
| 458 | UTIME_NOW. Work around it with a preparatory lstat prior to |
| 459 | calling utimensat; fortunately, there is not much timing |
| 460 | impact due to the extra syscall even on file systems where |
| 461 | UTIME_OMIT would have worked. |
| 462 | |
| 463 | The same bug occurs in Solaris 11.1 (Apr 2013). |
| 464 | |
| 465 | FIXME: Simplify this for Linux in 2016 and for Solaris in |
| 466 | 2024, when file system bugs are no longer common. */ |
| 467 | if (adjustment_needed == 2) |
| 468 | { |
| 469 | if (lstat (file, &st)) |
| 470 | return -1; |
| 471 | if (ts[0].tv_nsec == UTIME_OMIT) |
| 472 | ts[0] = get_stat_atime (&st); |
| 473 | else if (ts[1].tv_nsec == UTIME_OMIT) |
| 474 | ts[1] = get_stat_mtime (&st); |
| 475 | /* Note that st is good, in case utimensat gives ENOSYS. */ |
| 476 | adjustment_needed++; |
| 477 | } |
| 478 | # endif |
| 479 | result = utimensat (AT_FDCWD, file, ts, AT_SYMLINK_NOFOLLOW); |
| 480 | # ifdef __linux__ |
| 481 | /* Work around a kernel bug: |
| 482 | http://bugzilla.redhat.com/442352 |
| 483 | http://bugzilla.redhat.com/449910 |
| 484 | It appears that utimensat can mistakenly return 280 rather |
| 485 | than -1 upon ENOSYS failure. |
| 486 | FIXME: remove in 2010 or whenever the offending kernels |
| 487 | are no longer in common use. */ |
| 488 | if (0 < result) |
| 489 | errno = ENOSYS; |
| 490 | # endif |
| 491 | if (result == 0 || errno != ENOSYS) |
| 492 | { |
| 493 | utimensat_works_really = 1; |
| 494 | lutimensat_works_really = 1; |
| 495 | return result; |
| 496 | } |
| 497 | } |
| 498 | lutimensat_works_really = -1; |
| 499 | #endif /* HAVE_UTIMENSAT */ |
| 500 | |
| 501 | /* The platform lacks an interface to set file timestamps with |
| 502 | nanosecond resolution, so do the best we can, discarding any |
| 503 | fractional part of the timestamp. */ |
| 504 | |
| 505 | if (adjustment_needed || REPLACE_FUNC_STAT_FILE) |
| 506 | { |
| 507 | if (adjustment_needed != 3 && lstat (file, &st)) |
| 508 | return -1; |
| 509 | if (ts && update_timespec (&st, &ts)) |
| 510 | return 0; |
| 511 | } |
| 512 | |
| 513 | /* On Linux, lutimes is a thin wrapper around utimensat, so there is |
| 514 | no point trying lutimes if utimensat failed with ENOSYS. */ |
| 515 | #if HAVE_LUTIMES && !HAVE_UTIMENSAT |
| 516 | { |
| 517 | struct timeval timeval[2]; |
| 518 | struct timeval *t; |
| 519 | int result; |
| 520 | if (ts) |
| 521 | { |
| 522 | timeval[0].tv_sec = ts[0].tv_sec; |
| 523 | timeval[0].tv_usec = ts[0].tv_nsec / 1000; |
| 524 | timeval[1].tv_sec = ts[1].tv_sec; |
| 525 | timeval[1].tv_usec = ts[1].tv_nsec / 1000; |
| 526 | t = timeval; |
| 527 | } |
| 528 | else |
| 529 | t = NULL; |
| 530 | |
| 531 | result = lutimes (file, t); |
| 532 | if (result == 0 || errno != ENOSYS) |
| 533 | return result; |
| 534 | } |
| 535 | #endif /* HAVE_LUTIMES && !HAVE_UTIMENSAT */ |
| 536 | |
| 537 | /* Out of luck for symlinks, but we still handle regular files. */ |
| 538 | if (!(adjustment_needed || REPLACE_FUNC_STAT_FILE) && lstat (file, &st)) |
| 539 | return -1; |
| 540 | if (!S_ISLNK (st.st_mode)) |
| 541 | return fdutimens (-1, file, ts); |
| 542 | errno = ENOSYS; |
| 543 | return -1; |
| 544 | } |