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Linux 2.6 - man page for utime (linux section 3posix)

UTIME(P)			    POSIX Programmer's Manual				 UTIME(P)

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 argu-
	      ment 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 applica-
       tion  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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					 UTIME(P)


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