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

       utime, utimes - change file last access and modification times

       #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  cur‐
       rent 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 appropriately.

       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 time‐
       stamps to something other than the current time on an append-only file.

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

       This page is part of release 3.74 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 http://www.kernel.org/doc/man-pages/.

Linux                                       2014-08-19                                   UTIME(2)

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