futimesat(2) — Linux manual page


FUTIMESAT(2)            Linux Programmer's Manual           FUTIMESAT(2)

NAME         top

       futimesat - change timestamps of a file relative to a directory
       file descriptor

SYNOPSIS         top

       #include <fcntl.h>            /* Definition of AT_* constants */
       #include <sys/time.h>

       int futimesat(int dirfd, const char *pathname,
                     const struct timeval times[2]);

   Feature Test Macro Requirements for glibc (see


DESCRIPTION         top

       This system call is obsolete.  Use utimensat(2) instead.

       The futimesat() system call operates in exactly the same way as
       utimes(2), except for the differences described in this manual

       If the pathname given in pathname is relative, then it is
       interpreted relative to the directory referred to by the file
       descriptor dirfd (rather than relative to the current working
       directory of the calling process, as is done by utimes(2) for a
       relative pathname).

       If pathname is relative and dirfd is the special value AT_FDCWD,
       then pathname is interpreted relative to the current working
       directory of the calling process (like utimes(2)).

       If pathname is absolute, then dirfd is ignored.  (See openat(2)
       for an explanation of why the dirfd argument is useful.)

RETURN VALUE         top

       On success, futimesat() returns a 0.  On error, -1 is returned
       and errno is set to indicate the error.

ERRORS         top

       The same errors that occur for utimes(2) can also occur for
       futimesat().  The following additional errors can occur for

       EBADF  pathname is relative but dirfd is neither AT_FDCWD nor a
              valid file descriptor.

              pathname is relative and dirfd is a file descriptor
              referring to a file other than a directory.

VERSIONS         top

       futimesat() was added to Linux in kernel 2.6.16; library support
       was added to glibc in version 2.4.

CONFORMING TO         top

       This system call is nonstandard.  It was implemented from a
       specification that was proposed for POSIX.1, but that
       specification was replaced by the one for utimensat(2).

       A similar system call exists on Solaris.

NOTES         top

   Glibc notes
       If pathname is NULL, then the glibc futimesat() wrapper function
       updates the times for the file referred to by dirfd.

SEE ALSO         top

       stat(2), utimensat(2), utimes(2), futimes(3), path_resolution(7)

COLOPHON         top

       This page is part of release 5.13 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

Linux                          2021-08-27                   FUTIMESAT(2)

Pages that refer to this page: open(2)syscalls(2)utime(2)utimensat(2)