UTIME(3P)						     POSIX Programmer's Manual							 UTIME(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing 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, 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 Technol-
       ogy -- 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(3P)