redhat man page for futimes

FUTIMES(3)						     Linux Programmer's Manual							FUTIMES(3)

NAME
       futimes, lutimes - change file timestamps

SYNOPSIS
       #include <sys/time.h>

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

       int lutimes(const char *filename, const struct timeval tv[2]);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       futimes(), lutimes():
	   Since glibc 2.19:
	       _DEFAULT_SOURCE
	   Glibc 2.19 and earlier:
	       _BSD_SOURCE

DESCRIPTION
       futimes()  changes  the access and modification times of a file in the same way as utimes(2), with the difference that the file whose time-
       stamps are to be changed is specified via a file descriptor, fd, rather than via a pathname.

       lutimes() changes the access and modification times of a file in the same way as utimes(2), with the difference that if filename refers	to
       a symbolic link, then the link is not dereferenced: instead, the timestamps of the symbolic link are changed.

RETURN VALUE
       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

ERRORS
       Errors are as for utimes(2), with the following additions for futimes():

       EBADF  fd is not a valid file descriptor.

       ENOSYS The /proc filesystem could not be accessed.

       The following additional error may occur for lutimes():

       ENOSYS The kernel does not support this call; Linux 2.6.22 or later is required.

VERSIONS
       futimes()  is  available  since	glibc 2.3.  lutimes() is available since glibc 2.6, and is implemented using the utimensat(2) system call,
       which is supported since kernel 2.6.22.

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       +---------------------+---------------+---------+
       |Interface	     | Attribute     | Value   |
       +---------------------+---------------+---------+
       |futimes(), lutimes() | Thread safety | MT-Safe |
       +---------------------+---------------+---------+
CONFORMING TO
       These functions are not specified in any standard.  Other than Linux, they are available only on the BSDs.

SEE ALSO
       utime(2), utimensat(2), symlink(7)

COLOPHON
       This page is part of release 4.15 of the Linux 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/.

Linux								    2017-09-15								FUTIMES(3)