sysdeps/unix/sysv/linux/utimensat.c

   1 /* Change access and modification times of open file.  Linux version.
   2    Copyright (C) 2007-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <sys/stat.h>
  21 #include <sysdep.h>
  22 #include <time.h>
  23 #include <kernel-features.h>
  24
  25 /* Helper function defined for easy reusage of the code which calls utimensat
  26    and utimensat_time64 syscall.  */
  27 int
  28 __utimensat64_helper (int fd, const char *file,
  29                       const struct __timespec64 tsp64[2], int flags)
  30 {
  31 #ifndef __NR_utimensat_time64
  32 # define __NR_utimensat_time64 __NR_utimensat
  33 #endif
  34
  35 #ifdef __ASSUME_TIME64_SYSCALLS
  36   return INLINE_SYSCALL_CALL (utimensat_time64, fd, file, &tsp64[0], flags);
  37 #else
  38   /* For UTIME_NOW and UTIME_OMIT the value of tv_sec field is ignored.  */
  39 # define TS_SPECIAL(ts) \
  40   ((ts).tv_nsec == UTIME_NOW || (ts).tv_nsec == UTIME_OMIT)
  41
  42   bool need_time64 = tsp64 != NULL
  43                      && ((!TS_SPECIAL (tsp64[0])
  44                           && !in_time_t_range (tsp64[0].tv_sec))
  45                          || (!TS_SPECIAL (tsp64[1])
  46                              && !in_time_t_range (tsp64[1].tv_sec)));
  47   if (need_time64)
  48     {
  49       int r = INLINE_SYSCALL_CALL (utimensat_time64, fd, file, &tsp64[0],
  50                                    flags);
  51       if (r == 0 || errno != ENOSYS)
  52         return r;
  53       __set_errno (EOVERFLOW);
  54       return -1;
  55     }
  56
  57   struct timespec tsp32[2], *ptsp32 = NULL;
  58   if (tsp64)
  59     {
  60       tsp32[0] = valid_timespec64_to_timespec (tsp64[0]);
  61       tsp32[1] = valid_timespec64_to_timespec (tsp64[1]);
  62       ptsp32 = tsp32;
  63     }
  64
  65   return INLINE_SYSCALL_CALL (utimensat, fd, file, ptsp32, flags);
  66 #endif
  67 }
  68 libc_hidden_def (__utimensat64_helper)
  69
  70 /* Change the access time of FILE to TSP[0] and
  71    the modification time of FILE to TSP[1].
  72
  73    Starting with 2.6.22 the Linux kernel has the utimensat syscall.  */
  74 int
  75 __utimensat64 (int fd, const char *file, const struct __timespec64 tsp64[2],
  76                int flags)
  77 {
  78   if (file == NULL)
  79     return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
  80
  81   return __utimensat64_helper (fd, file, &tsp64[0], flags);
  82 }
  83
  84 #if __TIMESIZE != 64
  85 libc_hidden_def (__utimensat64)
  86
  87 int
  88 __utimensat (int fd, const char *file, const struct timespec tsp[2],
  89              int flags)
  90 {
  91   struct __timespec64 tsp64[2];
  92   if (tsp)
  93     {
  94       tsp64[0] = valid_timespec_to_timespec64 (tsp[0]);
  95       tsp64[1] = valid_timespec_to_timespec64 (tsp[1]);
  96     }
  97
  98   return __utimensat64 (fd, file, tsp ? &tsp64[0] : NULL, flags);
  99 }
 100 #endif
 101 weak_alias (__utimensat, utimensat)