futimes(3) — Linux manual page

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)

COLOPHON

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Linux man-pages 6.9.1          2024-05-02                     futimes(3)

Pages that refer to this page: futimesat(2), utime(2), utimensat(2), timeval(3type), symlink(7)

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