man futimes (3): change file timestamps

Other Alias

lutimes

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 appropriately.

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 kernel 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

CONFORMING TO

These functions are not specified in any standard. Other than Linux, they are available only on the BSDs.

COLOPHON

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