UTIME(2)                  (2017-09-15)                   UTIME(2)

          utime, utimes - change file last access and modification

          #include <sys/types.h>
          #include <utime.h>

          int utime(const char *filename, const struct utimbuf *times);

          #include <sys/time.h>

          int utimes(const char *filename, const struct timeval times[2]);

          Note: modern applications may prefer to use the interfaces
          described in utimensat(2).

          The utime() system call changes the access and modification
          times of the inode specified by filename to the actime and
          modtime fields of times respectively.

          If times is NULL, then the access and modification times of
          the file are set to the current time.

          Changing timestamps is permitted when: either the process
          has appropriate privileges, or the effective user ID equals
          the user ID of the file, or times is NULL and the process
          has write permission for the file.

          The utimbuf structure is:

              struct utimbuf {
                  time_t actime;       /* access time */
                  time_t modtime;      /* modification time */

          The utime() system call allows specification of timestamps
          with a resolution of 1 second.

          The utimes() system call is similar, but the times argument
          refers to an array rather than a structure.  The elements of
          this array are timeval structures, which allow a precision
          of 1 microsecond for specifying timestamps.  The timeval
          structure is:

              struct timeval {
                  long tv_sec;        /* seconds */
                  long tv_usec;       /* microseconds */

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          times[0] specifies the new access time, and times[1] speci-
          fies the new modification time.  If times is NULL, then
          analogously to utime(), the access and modification times of
          the file are set to the current time.

          On success, zero is returned.  On error, -1 is returned, and
          errno is set appropriately.

               Search permission is denied for one of the directories
               in the path prefix of path (see also

               times is NULL, the caller's effective user ID does not
               match the owner of the file, the caller does not have
               write access to the file, and the caller is not privi-
               leged (Linux: does not have either the CAP_DAC_OVERRIDE
               or the CAP_FOWNER capability).

               filename does not exist.

               times is not NULL, the caller's effective UID does not
               match the owner of the file, and the caller is not
               privileged (Linux: does not have the CAP_FOWNER capa-

               path resides on a read-only filesystem.

          utime(): SVr4, POSIX.1-2001.  POSIX.1-2008 marks utime() as

          utimes(): 4.3BSD, POSIX.1-2001.

          Linux does not allow changing the timestamps on an immutable
          file, or setting the timestamps to something other than the
          current time on an append-only file.

          chattr(1), touch(1), futimesat(2), stat(2), utimensat(2),
          futimens(3), futimes(3), inode(7)

          This page is part of release 5.10 of the Linux man-pages
          project.  A description of the project, information about

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     UTIME(2)                  (2017-09-15)                   UTIME(2)

          reporting bugs, and the latest version of this page, can be
          found at https://www.kernel.org/doc/man-pages/.

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