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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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futimes(3) Library Functions Manual futimes(3)
futimes, lutimes - change file timestamps
Standard C library (libc, -lc)
#include <sys/time.h>
int futimes(int fd, const struct timeval tv[2]);
int lutimes(const char *path, 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
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 path refers
to a symbolic link, then the link is not dereferenced: instead,
the timestamps of the symbolic link are changed.
On success, zero is returned. On error, -1 is returned, and errno
is set to indicate the error.
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.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ futimes(), lutimes() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Linux, BSD.
futimes()
glibc 2.3.
lutimes()
glibc 2.6.
lutimes() is implemented using the utimensat(2) system call.
utime(2), utimensat(2), symlink(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
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⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
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part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-05-17 futimes(3)
Pages that refer to this page: futimesat(2), utime(2), utimensat(2), timeval(3type), symlink(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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