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.

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 Linux 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 │
       └─────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

STANDARDS
       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)

Linux man-pages 6.03                                         2023-02-05                                                  futimes(3)