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

NAME
       utime, utimes - change file last	access and modification	times

SYNOPSIS
       #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]);

DESCRIPTION
       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
       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 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.

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

ERRORS
       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 ei-
	      ther 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 file system.

CONFORMING TO
       utime():	SVr4, POSIX.1-2001.  POSIX.1-2008 marks	utime()	as obsolete.
       utimes(): 4.3BSD, POSIX.1-2001.

NOTES
       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.

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

COLOPHON
       This  page  is  part of release 3.53 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found	at http://www.kernel.org/doc/man-pages/.

Linux				  2008-08-06			      UTIME(2)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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