PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult the corresponding Linux manual page for details of Linux behavior), or the  interface
       may not be implemented on Linux.

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, the utime() function shall mark the last file  status  change  timestamp  for
       update; 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 a component of a pathname 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 names an existing file that is neither a directory nor a symbolic
              link to a directory, or the path argument contains at least one  non-<slash>  character  and  ends
              with  one  or  more  trailing <slash> characters and the last pathname component names an existing
              file that is neither a directory nor a symbolic link to a directory.

       EPERM  The times argument is not a null pointer and the effective user ID of the calling process does not
              match the owner of the file and the calling process does not have 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
              The length of a pathname exceeds {PATH_MAX}, or pathname resolution of a symbolic link produced an
              intermediate result with a length that exceeds {PATH_MAX}.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       Since the utimbuf structure only contains time_t variables and is not accurate to fractions of a  second,
       applications should use the utimensat() function instead of the obsolescent utime() function.

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 last data access timestamp 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()  or
       fstat()  to retrieve the file's st_atim and st_mtim parameters, set actime and modtime in the buffer, and
       change one of them before making the utime() call.

FUTURE DIRECTIONS

       The utime() function may be removed in a future version.

SEE ALSO

       fstat(), fstatat(), futimens()

       The Base Definitions volume of POSIX.1‐2017, <sys_stat.h>, <utime.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group  Base
       Specifications  Issue  7, 2018 Edition, Copyright (C) 2018 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 .

       Any  typographical  or formatting errors that appear in this page are most likely to have been introduced
       during  the  conversion  of  the  source  files  to  man  page  format.  To  report  such   errors,   see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                                         UTIME(3POSIX)