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.
263 lines
6.7 KiB
Groff
263 lines
6.7 KiB
Groff
.\" $NetBSD: utimes.2,v 1.13 1999/03/22 19:45:11 garbled Exp $
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.\"
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.\" Copyright (c) 1990, 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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.\" @(#)utimes.2 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 UTIMES 2
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.Os
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.Sh NAME
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.Nm utimes ,
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.Nm lutimes ,
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.Nm futimes ,
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.Nm futimesat
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.Nd set file access and modification times
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/time.h
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.Ft int
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.Fn utimes "const char *path" "const struct timeval *times"
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.Ft int
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.Fn lutimes "const char *path" "const struct timeval *times"
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.Ft int
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.Fn futimes "int fd" "const struct timeval *times"
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.Ft int
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.Fn futimesat "int fd" "const char *path" "const struct timeval times[2]"
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.Sh DESCRIPTION
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.Bf -symbolic
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These interfaces are obsoleted by
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.Xr futimens 2
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and
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.Xr utimensat 2
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because they are not accurate to nanoseconds.
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.Ef
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.Pp
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The access and modification times of the file named by
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.Fa path
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or referenced by
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.Fa fd
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are changed as specified by the argument
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.Fa times .
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.Pp
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If
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.Fa times
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is
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.Dv NULL ,
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the access and modification times are set to the current time.
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The caller must be the owner of the file, have permission to
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write the file, or be the super-user.
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.Pp
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If
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.Fa times
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is
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.No non- Ns Dv NULL ,
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it is assumed to point to an array of two timeval structures.
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The access time is set to the value of the first element, and the
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modification time is set to the value of the second element.
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For file systems that support file birth (creation) times (such as
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.Dv UFS2 ) ,
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the birth time will be set to the value of the second element
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if the second element is older than the currently set birth time.
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To set both a birth time and a modification time,
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two calls are required; the first to set the birth time
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and the second to set the (presumably newer) modification time.
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Ideally a new system call will be added that allows the setting
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of all three times at once.
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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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In either case, the inode-change-time of the file is set to the current
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time.
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.Pp
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The
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.Fn lutimes
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system call
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is like
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.Fn utimes
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except in the case where the named file is a symbolic link,
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in which case
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.Fn lutimes
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changes the access and modification times of the link,
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while
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.Fn utimes
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changes the times of the file the link references.
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.Pp
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The
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.Fn futimesat
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system call is equivalent to
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.Fn utimes
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except in the case where
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.Fa path
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specifies a relative path.
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In this case the access and modification time
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is set to that of a file relative to the directory associated with the file
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descriptor
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.Fa fd
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instead of the current working directory.
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If
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.Fn futimesat
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is passed the special value
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.Dv AT_FDCWD
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in the
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.Fa fd
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parameter, the current working directory is used and the behavior
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is identical to a call to
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.Fn utimes .
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.Sh RETURN VALUES
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.Rv -std
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.Sh ERRORS
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All of the system call will fail if:
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.Bl -tag -width Er
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.It Bq Er EACCES
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Search permission is denied for a component of the path prefix.
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.It Bq Er EACCES
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The
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.Fa times
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argument is
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.Dv NULL
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and the effective user ID of the process does not
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match the owner of the file, and is not the super-user, and write
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access is denied.
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.It Bq Er EFAULT
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The
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.Fa path
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or
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.Fa times
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argument
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points outside the process's allocated address space.
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.It Bq Er EFAULT
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The
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.Fa times
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argument
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points outside the process's allocated address space.
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.It Bq Er EINVAL
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The
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.Va tv_usec
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component of at least one of the values specified by the
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.Fa times
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argument has a value less than 0 or greater than 999999.
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.It Bq Er EIO
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An I/O error occurred while reading or writing the affected inode.
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.It Bq Er ELOOP
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Too many symbolic links were encountered in translating the pathname.
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.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded
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.Dv NAME_MAX
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characters, or an entire path name exceeded
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.Dv PATH_MAX
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characters.
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.It Bq Er ENOENT
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The named file does not exist.
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.It Bq Er ENOTDIR
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A component of the path prefix is not a directory.
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.It Bq Er EPERM
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The
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.Fa times
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argument is not
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.Dv NULL
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and the calling process's effective user ID
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does not match the owner of the file and is not the super-user.
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.It Bq Er EPERM
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The named file has its immutable or append-only flags set.
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See the
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.Xr chflags 2
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manual page for more information.
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.It Bq Er EROFS
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The file system containing the file is mounted read-only.
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.El
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.Pp
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The
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.Fn futimes
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system call
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will fail if:
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.Bl -tag -width Er
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.It Bq Er EBADF
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The
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.Fa fd
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argument
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does not refer to a valid descriptor.
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.El
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.Pp
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In addition to the errors returned by the
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.Fn utimes ,
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the
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.Fn futimesat
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may fail if:
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.Bl -tag -width Er
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.It Bq Er EBADF
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The
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.Fa path
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argument does not specify an absolute path and the
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.Fa fd
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argument is neither
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.Dv AT_FDCWD
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nor a valid file descriptor open for searching.
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.It Bq Er ENOTDIR
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The
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.Fa path
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argument is not an absolute path and
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.Fa fd
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is neither
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.Dv AT_FDCWD
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nor a file descriptor associated with a directory.
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.El
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.Sh SEE ALSO
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.Xr chflags 2 ,
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.Xr stat 2 ,
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.Xr utimensat 2 ,
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.Xr utime 3
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.Sh STANDARDS
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The
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.Fn utimes
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function is expected to conform to
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.St -xpg4.2 .
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The
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.Fn futimesat
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system call follows The Open Group Extended API Set 2 specification
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but was replaced by
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.Fn utimensat
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in
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.St -p1003.1-2008 .
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.Sh HISTORY
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The
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.Fn utimes
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system call appeared in
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.Bx 4.2 .
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The
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.Fn futimes
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and
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.Fn lutimes
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system calls first appeared in
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.Fx 3.0 .
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The
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.Fn futimesat
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system call appeared in
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.Fx 8.0 .
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