UTIME(2)                    Linux Programmer's Manual                   UTIME(2)

       utime, utimes - change file last access and modification times

       #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

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

       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 */

       times[0] specifies the new access time, and times[1] specifies 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
       to indicate the error.

       EACCES Search permission is denied for one of the directories in the path
              prefix of path (see also path_resolution(7)).

       EACCES 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 privileged (Linux: does not have
              either the CAP_DAC_OVERRIDE or the CAP_FOWNER capability).

       ENOENT filename does not exist.

       EPERM  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 capability).

       EROFS  path resides on a read-only filesystem.

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

       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 5.13 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at

Linux                              2021-03-22                           UTIME(2)