.\" $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 January 17, 2016 .Dt UTIMENSAT 2 .Os .Sh NAME .Nm futimens , .Nm utimensat .Nd set file access and modification times .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. 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 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 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 .