#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]);

       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 appropri-
       ate  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

       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 reso-
       lution 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 speci-
       fying 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 appropriately.

       EACCES Search permission is denied for one of the  directories  in  the

       EROFS  path resides on a read-only file system.

       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.

       In libc4 and libc5, utimes() is just a wrapper for  utime()  and  hence
       does not allow a subsecond resolution.

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

       This  page  is  part of release 3.35 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://man7.org/linux/man-pages/.

Linux                             2008-08-06                          UTIME(2)
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