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.TH FUTIMES 3 2016-03-15 "Linux" "Linux Programmer's Manual"
.SH NAME
futimes, lutimes \- change file timestamps
.SH SYNOPSIS
.nf
.B #include <sys/time.h>

.BI "int futimes(int " fd ", const struct timeval " tv [2]);

.BI "int lutimes(const char *" filename ", const struct timeval " tv [2]);
.fi
.sp
.in -4n
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.in
.sp
.BR futimes (),
.BR lutimes ():
    Since glibc 2.19:
        _DEFAULT_SOURCE
    Glibc 2.19 and earlier:
        _BSD_SOURCE
.SH DESCRIPTION
.BR futimes ()
changes the access and modification times of a file in the same way as
.BR utimes (2),
with the difference that the file whose timestamps are to be changed
is specified via a file descriptor,
.IR fd ,
rather than via a pathname.

.BR lutimes ()
changes the access and modification times of a file in the same way as
.BR utimes (2),
with the difference that if
.I filename
refers to a symbolic link, then the link is not dereferenced:
instead, the timestamps of the symbolic link are changed.
.SH RETURN VALUE
On success, zero is returned.
On error, \-1 is returned, and
.I errno
is set appropriately.
.SH ERRORS
Errors are as for
.BR utimes (2),
with the following additions for
.BR futimes ():
.TP
.B EBADF
.I fd
is not a valid file descriptor.
.TP
.B ENOSYS
The
.I /proc
filesystem could not be accessed.
.PP
The following additional error may occur for
.BR lutimes ():
.TP
.B ENOSYS
The kernel does not support this call; Linux 2.6.22 or later is required.
.SH VERSIONS
.BR futimes ()
is available since glibc 2.3.
.BR lutimes ()
is available since glibc 2.6, and is implemented using the
.BR utimensat (2)
system call, which is supported since kernel 2.6.22.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lbw20 lb lb
l l l.
Interface	Attribute	Value
T{
.BR futimes (),
.BR lutimes ()
T}	Thread safety	MT-Safe
.TE
.SH CONFORMING TO
These functions are not specified in any standard.
Other than Linux, they are available only on the BSDs.
.SH SEE ALSO
.BR utime (2),
.BR utimensat (2),
.BR symlink (7)
.SH COLOPHON
This page is part of release 4.10 of the Linux
.I man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
\%https://www.kernel.org/doc/man\-pages/.