NAME

       utime - set file access and modification times

SYNOPSIS

       #include <utime.h>

       int utime(const char *path, const struct utimbuf *times);

DESCRIPTION

       The utime() function shall set the access and modification times of the file named by the path argument.

       If  times  is  a  null pointer, the access and modification times of the file shall be set to the current
       time. The effective user ID of the process shall match the owner of the file, or the  process  has  write
       permission to the file or has appropriate privileges, to use utime() in this manner.

       If  times  is  not a null pointer, times shall be interpreted as a pointer to a utimbuf structure and the
       access and modification times shall be set to the values contained in the designated  structure.  Only  a
       process  with  the  effective  user  ID  equal  to  the user ID of the file or a process with appropriate
       privileges may use utime() this way.

       The utimbuf structure is defined in the <utime.h>  header.   The  times  in  the  structure  utimbuf  are
       measured in seconds since the Epoch.

       Upon  successful  completion, utime() shall mark the time of the last file status change, st_ctime, to be
       updated; see <sys/stat.h>.

RETURN VALUE

       Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and errno shall  be  set
       to indicate the error, and the file times shall not be affected.

ERRORS

       The utime() function shall fail if:

       EACCES Search  permission  is  denied  by a component of the path prefix; or the times argument is a null
              pointer and the effective user ID of the process does not match the owner of the file, the process
              does not have write permission for the file, and the process does not have appropriate privileges.

       ELOOP  A loop exists in symbolic links encountered during resolution of the path argument.

       ENAMETOOLONG
              The length of the path argument  exceeds  {PATH_MAX}  or  a  pathname  component  is  longer  than
              {NAME_MAX}.

       ENOENT A component of path does not name an existing file or path is an empty string.

       ENOTDIR
              A component of the path prefix is not a directory.

       EPERM  The times argument is not a null pointer and the calling process' effective user ID does not match
              the owner of the file and the calling process does not have the appropriate privileges.

       EROFS  The file system containing the file is read-only.

       The utime() function may fail if:

       ELOOP  More than {SYMLOOP_MAX} symbolic links were encountered during resolution of the path argument.

       ENAMETOOLONG
              As  a result of encountering a symbolic link in resolution of the path argument, the length of the
              substituted pathname string exceeded {PATH_MAX}.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       The actime structure member must  be  present  so  that  an  application  may  set  it,  even  though  an
       implementation  may  ignore  it  and not change the access time on the file. If an application intends to
       leave one of the times of a file unchanged while changing the other, it should use stat() to retrieve the
       file's st_atime and st_mtime parameters, set actime and modtime in the buffer, and  change  one  of  them
       before making the utime() call.

FUTURE DIRECTIONS

       None.

SEE ALSO

       The Base Definitions volume of IEEE Std 1003.1-2001, <sys/stat.h>, <utime.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers,
       Inc and The Open Group. In the event of any discrepancy between this version and the  original  IEEE  and
       The  Open  Group  Standard,  the  original  IEEE and The Open Group Standard is the referee document. The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                                   2003                                              UTIME(P)