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+.\"	$NetBSD: utimes.2,v 1.13 1999/03/22 19:45:11 garbled Exp $
+.\"
+.\" Copyright (c) 1990, 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.
+.\" 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.
+.\"
+.\"     @(#)utimes.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd April 10, 2008
+.Dt UTIMES 2
+.Os
+.Sh NAME
+.Nm utimes ,
+.Nm lutimes ,
+.Nm futimes ,
+.Nm futimesat
+.Nd set file access and modification times
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/time.h
+.Ft int
+.Fn utimes "const char *path" "const struct timeval *times"
+.Ft int
+.Fn lutimes "const char *path" "const struct timeval *times"
+.Ft int
+.Fn futimes "int fd" "const struct timeval *times"
+.Ft int
+.Fn futimesat "int fd" "const char *path" "const struct timeval times[2]"
+.Sh DESCRIPTION
+The access and modification times of the file named by
+.Fa path
+or referenced by
+.Fa fd
+are changed as specified by the argument
+.Fa times .
+.Pp
+If
+.Fa times
+is
+.Dv NULL ,
+the access and modification times are set to the current time.
+The caller must be the owner of the file, have permission to
+write the file, or be the super-user.
+.Pp
+If
+.Fa times
+is
+.No non- Ns Dv NULL ,
+it is assumed to point to an array of two timeval structures.
+The access time is set to the value of the first element, and the
+modification time is set to the value of the second element.
+For file systems that support file birth (creation) times (such as
+.Dv UFS2 ) ,
+the birth time will be set to the value of the second element
+if the second element is older than the currently set birth time.
+To set both a birth time and a modification time,
+two calls are required; the first to set the birth time
+and the second to set the (presumably newer) modification time.
+Ideally a new system call will be added that allows the setting
+of all three times at once.
+The caller must be the owner of the file or be the super-user.
+.Pp
+In either case, the inode-change-time of the file is set to the current
+time.
+.Pp
+The
+.Fn lutimes
+system call
+is like
+.Fn utimes
+except in the case where the named file is a symbolic link,
+in which case
+.Fn lutimes
+changes the access and modification times of the link,
+while
+.Fn utimes
+changes the times of the file the link references.
+.Pp
+The
+.Fn futimesat
+system call is equivalent to
+.Fn utimes
+except in the case where
+.Fa path
+specifies a relative path.
+In this case the access and modification time
+is set to that of a file relative to the directory associated with the file
+descriptor
+.Fa fd
+instead of the current working directory.
+If
+.Fn futimesat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fd
+parameter, the current working directory is used and the behavior is identical to
+a call to
+.Fn utimes .
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn utimes
+and
+.Fn lutimes
+system calls
+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 super-user, and write
+access is denied.
+.It Bq Er EFAULT
+The
+.Fa path
+or
+.Fa times
+argument
+points outside the process's allocated address space.
+.It Bq Er EIO
+An 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
+.Dv NAME_MAX
+characters, or an entire path name exceeded
+.Dv PATH_MAX
+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 times
+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 super-user.
+.It Bq Er EPERM
+The named file has its immutable or append-only flag set, see the
+.Xr chflags 2
+manual page for more information.
+.It Bq Er EROFS
+The file system containing the file is mounted read-only.
+.El
+.Pp
+The
+.Fn futimes
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa fd
+argument
+does not refer to a valid descriptor.
+.El
+.Pp
+All of the system calls will fail if:
+.Bl -tag -width Er
+.It Bq Er EACCES
+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 super-user, and write
+access is denied.
+.It Bq Er EFAULT
+The
+.Fa times
+argument
+points outside the process's allocated address space.
+.It Bq Er EINVAL
+The
+.Va tv_usec
+component of at least one of the values specified by the
+.Fa times
+argument has a value less than 0 or greater than 999999.
+.It Bq Er EIO
+An I/O error occurred while reading or writing the affected inode.
+.It Bq Er EPERM
+The
+.Fa times
+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 super-user.
+.It Bq Er EROFS
+The file system containing the file is mounted read-only.
+.El
+.Pp
+In addition to the errors returned by the
+.Fn utimes ,
+the
+.Fn futimesat
+may fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa path
+argument does not specify an absolute path and the
+.Fa fd
+argument is neither
+.Dv AT_FDCWD
+nor a valid file descriptor open for searching.
+.It Bq Er ENOTDIR
+The
+.Fa path
+argument is not an absolute path and
+.Fa fd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.El
+.Sh SEE ALSO
+.Xr chflags 2 ,
+.Xr stat 2 ,
+.Xr utime 3
+.Sh STANDARDS
+The
+.Fn utimes
+function is expected to conform to
+.St -xpg4.2 .
+The
+.Fn futimesat
+system call follows The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn utimes
+system call appeared in
+.Bx 4.2 .
+The
+.Fn futimes
+and
+.Fn lutimes
+system calls first appeared in
+.Fx 3.0 .
+The
+.Fn futimesat
+system call appeared in
+.Fx 8.0 .