2 @section @code{futimens}
5 POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/futimens.html}
7 Gnulib module: futimens
9 Portability problems fixed by Gnulib:
12 This function is missing on some platforms:
13 glibc 2.3.6, Mac OS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x, mingw, MSVC 14, Interix 3.5, BeOS, Android 4.3.
14 However, the replacement function may end up truncating timestamps to
15 worse resolution than supported by the file system.
17 This function returns a bogus value instead of failing with
18 @code{ENOSYS} on some platforms:
21 When using @code{UTIME_OMIT} or @code{UTIME_NOW}, some systems require
22 the @code{tv_sec} argument to be 0, and don't necessarily handle all
23 file permissions in the manner required by POSIX:
26 When using @code{UTIME_OMIT} for the modification time, but specifying
27 an access time, some systems fail to update the change time:
28 Linux kernel 2.6.32, Solaris 11.1.
30 Passing @code{AT_FDCWD} as the fd argument does not properly fail with
31 @code{EBADF} on some systems:
32 glibc 2.11, Solaris 11.
35 Portability problems not fixed by Gnulib:
38 Some platforms lack the ability to change the timestamps of a file
39 descriptor, so the replacement can fail with @code{ENOSYS}; the gnulib
40 module @samp{utimens} provides a more reliable interface @code{fdutimens}.
42 The mere act of using @code{stat} modifies the access time of
43 directories on some platforms, so @code{utimensat} can only
44 effectively change directory modification time: