.\"	$OpenBSD: utime.3,v 1.14 2000/12/24 00:30:53 aaron Exp $
.\"
.\" Copyright (c) 1980, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd August 13, 1993
.Dt UTIME 3
.Os
.Sh NAME
.Nm utime
.Nd set file times
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <utime.h>
.Ft int
.Fn utime "const char *file" "const struct utimbuf *timep"
.Sh DESCRIPTION
.Bf -symbolic
This interface is obsoleted by
.Xr utimes 2 .
.Ef
.Pp
The
.Fn utime
function sets the access and modification times of the named file.
.Pp
If
.Fa timep
is
.Dv NULL ,
the access and modification times are set to the current time.
The calling process must be the owner of the file or have permission to
write the file.
.Pp
If
.Fa timep
is non-null
.Fa time
is assumed to be a pointer to a
.Li utimbuf
structure, as defined in
.Aq Pa utime.h :
.Bd -literal -offset indent
struct utimbuf {
	time_t actime;		/* Access time */
	time_t modtime;		/* Modification time */
};
.Ed
.Pp
The access time is set to the value of the
.Fa actime
member, and the modification
time is set to the value of the
.Fa modtime
member.
The times are measured in
seconds since 0 hours, 0 minutes, 0 seconds, January 1, 1970, Coordinated
Universal Time (UTC).
The calling process must be the owner of the file or be the superuser.
.Pp
In either case, the inode change-time of the file is set to the current
time.
.Sh RETURN VALUES
Upon successful completion, a value of 0 is returned.
Otherwise, a value of \-1 is returned and
.Va errno
is set to indicate the error.
.Sh ERRORS
.Fn utime
will fail if:
.Bl -tag -width Er
.It Bq Er EACCES
Search permission is denied for a component of the path prefix;
or the
.Fa times
argument is
.Dv NULL
and the effective user ID of the process does not
match the owner of the file, and is not the superuser, and write
access is denied.
.It Bq Er EFAULT
.Fa file
or
.Fa timep
points outside the process's allocated address space.
.It Bq Er EINVAL
The pathname contains a character with the high-order bit set.
.It Bq Er EIO
An
.Tn I/O
error occurred while reading or writing the affected inode.
.It Bq Er ELOOP
Too many symbolic links were encountered in translating the pathname.
.It Bq Er ENAMETOOLONG
A component of a pathname exceeded 255 characters,
or an entire path name exceeded 1023 characters.
.It Bq Er ENOENT
The named file does not exist.
.It Bq Er ENOTDIR
A component of the path prefix is not a directory.
.It Bq Er EPERM
The
.Fa timep
argument is not
.Dv NULL
and the calling process's effective user ID
does not match the owner of the file and is not the superuser.
.It Bq Er EROFS
The file system containing the file is mounted read-only.
.El
.Sh SEE ALSO
.Xr stat 2 ,
.Xr utimes 2
.Sh HISTORY
A
.Fn utime
function appeared in
.At v7 .
.Sh STANDARDS
The
.Fn utime
function conforms to
.St -p1003.1-88 .