f4aa4c78c7
Setting time by seconds or microseconds may cause unexpected effects especially if sysctl vfs.timestamp_precision=3 (not default). Calling the obsolete functions with NULL timestamps is acceptable.
95 lines
2.7 KiB
Groff
95 lines
2.7 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)utime.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd June 9, 2016
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.Dt UTIME 3
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.Os
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.Sh NAME
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.Nm utime
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.Nd set file times
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In utime.h
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.Ft int
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.Fn utime "const char *file" "const struct utimbuf *timep"
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.Sh DESCRIPTION
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.Bf -symbolic
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This interface is obsoleted by
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.Xr utimensat 2
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because it is not accurate to fractions of a second.
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.Ef
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.Pp
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The
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.Fn utime
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function sets the access and modification times of the named file from
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the
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.Va actime
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and
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.Va modtime
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fields of the
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.Vt "struct utimbuf"
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pointed at by
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.Fa timep .
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.Pp
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If the times are specified (the
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.Fa timep
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argument is
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.Pf non- Dv NULL )
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the caller must be the owner of the file or be the super-user.
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.Pp
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If the times are not specified (the
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.Fa timep
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argument is
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.Dv NULL )
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the caller must be the owner of the file, have permission to write
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the file, or be the super-user.
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.Sh ERRORS
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The
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.Fn utime
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function may fail and set
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.Va errno
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for any of the errors specified for the library function
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.Xr utimes 2 .
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.Sh SEE ALSO
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.Xr stat 2 ,
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.Xr utimensat 2 ,
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.Xr utimes 2
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.Sh STANDARDS
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The
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.Fn utime
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function conforms to
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.St -p1003.1-88 .
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.Sh HISTORY
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A
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.Fn utime
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function appeared in
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.At v7 .
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