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,
14 AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x, mingw, MSVC 9,
16 However, the replacement function may end up truncating timestamps to
17 less resolution than supported by the file system.
19 This function returns a bogus value instead of failing with
20 @code{ENOSYS} on some platforms:
23 When using @code{UTIME_OMIT} or @code{UTIME_NOW}, some systems require
24 the @code{tv_sec} argument to be 0, and don't necessarily handle all
25 file permissions in the manner required by POSIX:
28 When using @code{UTIME_OMIT} for the modification time, but specifying
29 an access time, some systems fail to update the change time:
30 Linux kernel 2.6.32, Solaris 11.1.
32 Passing @code{AT_FDCWD} as the fd argument does not properly fail with
33 @code{EBADF} on some systems:
34 glibc 2.11, Solaris 11.
37 Portability problems not fixed by Gnulib:
40 Some platforms lack the ability to change the timestamps of a file
41 descriptor, so the replacement can fail with @code{ENOSYS}; the gnulib
42 module @samp{utimens} provides a more reliable interface @code{fdutimens}.
44 The mere act of using @code{stat} modifies the access time of
45 directories on some platforms, so @code{utimensat} can only
46 effectively change directory modification time: