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 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 time-
stamps 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 fu-
times():
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 at-
tributes(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)
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