e0e0323354
The futimens() and utimensat() compat stubs allowed using these functions on kernels that did not have the system calls yet (10.2, old 11-current). Also remove the documentation of the [ENOTSUP] error that could occur with an old kernel. A -DNO_CLEAN build may fail because the depend files refer to the deleted files.
292 lines
7.2 KiB
Groff
292 lines
7.2 KiB
Groff
.\" $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.
|
|
.\" Copyright (c) 2012, Jilles Tjoelker
|
|
.\"
|
|
.\" 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. 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 June 7, 2017
|
|
.Dt UTIMENSAT 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm futimens ,
|
|
.Nm utimensat
|
|
.Nd set file access and modification times
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In sys/stat.h
|
|
.Ft int
|
|
.Fn futimens "int fd" "const struct timespec times[2]"
|
|
.Ft int
|
|
.Fo utimensat
|
|
.Fa "int fd"
|
|
.Fa "const char *path"
|
|
.Fa "const struct timespec times[2]"
|
|
.Fa "int flag"
|
|
.Fc
|
|
.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 .
|
|
The inode-change-time of the file is set to the current time.
|
|
.Pp
|
|
If
|
|
.Fa path
|
|
specifies a relative path,
|
|
it is relative to the current working directory if
|
|
.Fa fd
|
|
is
|
|
.Dv AT_FDCWD
|
|
and otherwise relative to the directory associated with the file descriptor
|
|
.Fa fd .
|
|
.Pp
|
|
The
|
|
.Va tv_nsec
|
|
field of a
|
|
.Vt timespec
|
|
structure
|
|
can be set to the special value
|
|
.Dv UTIME_NOW
|
|
to set the current time, or to
|
|
.Dv UTIME_OMIT
|
|
to leave the time unchanged.
|
|
In either case, the
|
|
.Va tv_sec
|
|
field is ignored.
|
|
.Pp
|
|
If
|
|
.Fa times
|
|
is
|
|
.No non- Ns Dv NULL ,
|
|
it is assumed to point to an array of two timespec 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.
|
|
If
|
|
.Fa times
|
|
is
|
|
.Dv NULL ,
|
|
this is equivalent to passing
|
|
a pointer to an array of two timespec structures
|
|
with both
|
|
.Va tv_nsec
|
|
fields set to
|
|
.Dv UTIME_NOW .
|
|
.Pp
|
|
If both
|
|
.Va tv_nsec
|
|
fields are
|
|
.Dv UTIME_OMIT ,
|
|
the timestamps remain unchanged and
|
|
no permissions are needed for the file itself,
|
|
although search permissions may be required for the path prefix.
|
|
The call may or may not succeed if the named file does not exist.
|
|
.Pp
|
|
If both
|
|
.Va tv_nsec
|
|
fields are
|
|
.Dv UTIME_NOW ,
|
|
the caller must be the owner of the file, have permission to
|
|
write the file, or be the super-user.
|
|
.Pp
|
|
For all other values of the timestamps,
|
|
the caller must be the owner of the file or be the super-user.
|
|
.Pp
|
|
The values for the
|
|
.Fa flag
|
|
argument of the
|
|
.Fn utimensat
|
|
system call
|
|
are constructed by a bitwise-inclusive OR of flags from the following list,
|
|
defined in
|
|
.In fcntl.h :
|
|
.Bl -tag -width indent
|
|
.It Dv AT_SYMLINK_NOFOLLOW
|
|
If
|
|
.Fa path
|
|
names a symbolic link, the symbolic link's times are changed.
|
|
By default,
|
|
.Fn utimensat
|
|
changes the times of the file referenced by the symbolic link.
|
|
.El
|
|
.Sh RETURN VALUES
|
|
.Rv -std
|
|
.Sh COMPATIBILITY
|
|
If the running kernel does not support this system call,
|
|
a wrapper emulates it using
|
|
.Xr fstatat 2 ,
|
|
.Xr futimesat 2
|
|
and
|
|
.Xr lutimes 2 .
|
|
As a result, timestamps will be rounded down to the nearest microsecond,
|
|
.Dv UTIME_OMIT
|
|
is not atomic and
|
|
.Dv AT_SYMLINK_NOFOLLOW
|
|
is not available with a path relative to a file descriptor.
|
|
.Sh ERRORS
|
|
These system calls will fail if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EACCES
|
|
The
|
|
.Fa times
|
|
argument is
|
|
.Dv NULL ,
|
|
or both
|
|
.Va tv_nsec
|
|
values are
|
|
.Dv UTIME_NOW ,
|
|
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_nsec
|
|
component of at least one of the values specified by the
|
|
.Fa times
|
|
argument has a value less than 0 or greater than 999999999 and is not equal to
|
|
.Dv UTIME_NOW
|
|
or
|
|
.Dv UTIME_OMIT .
|
|
.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
|
|
nor are both
|
|
.Va tv_nsec
|
|
values
|
|
.Dv UTIME_NOW ,
|
|
nor are both
|
|
.Va tv_nsec
|
|
values
|
|
.Dv UTIME_OMIT
|
|
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 futimens
|
|
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
|
|
The
|
|
.Fn utimensat
|
|
system call
|
|
will fail if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EACCES
|
|
Search permission is denied for a component of the path prefix.
|
|
.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.
|
|
.It Bq Er EFAULT
|
|
The
|
|
.Fa path
|
|
argument
|
|
points outside the process's allocated address space.
|
|
.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 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 symlink 2 ,
|
|
.Xr utimes 2 ,
|
|
.Xr utime 3 ,
|
|
.Xr symlink 7
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn futimens
|
|
and
|
|
.Fn utimensat
|
|
system calls are expected to conform to
|
|
.St -p1003.1-2008 .
|
|
.Sh HISTORY
|
|
The
|
|
.Fn futimens
|
|
and
|
|
.Fn utimensat
|
|
system calls appeared in
|
|
.Fx 10.3 .
|