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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 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  times-
       tamps.  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_resolu-
              tion(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 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), futimes(3), futimens(3)

COLOPHON
       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2008-08-06                          UTIME(2)