futimes(3)                 Library Functions Manual                 futimes(3)

NAME
       futimes, lutimes - change file timestamps

LIBRARY
       Standard C library (libc, -lc)

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
       timestamps 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 to indicate the error.

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.

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

       +--------------------------------------------+---------------+---------+
       |Interface                                   | Attribute     | Value   |
       +--------------------------------------------+---------------+---------+
       |futimes (), lutimes ()                      | Thread safety | MT-Safe |
       +--------------------------------------------+---------------+---------+
STANDARDS
       Linux, BSD.

HISTORY
       futimes()
              glibc 2.3.

       lutimes()
              glibc 2.6.

NOTES
       lutimes() is implemented using the utimensat(2) system call.

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

Linux man-pages 6.7               2023-10-31                        futimes(3)