futimens - GNU Gnulib

Gnulib module: futimens

Portability problems fixed by Gnulib:

This function is missing on some platforms: 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 9, Interix 3.5, BeOS. However, the replacement function may end up truncating timestamps to less resolution than supported by the file system.
This function returns a bogus value instead of failing with ENOSYS on some platforms: Linux kernel 2.6.21.
When using UTIME_OMIT or UTIME_NOW, some systems require the tv_sec argument to be 0, and don't necessarily handle all file permissions in the manner required by POSIX: Linux kernel 2.6.25.
When using UTIME_OMIT for the modification time, but specifying an access time, some systems fail to update the change time: Linux kernel 2.6.32.
Passing AT_FDCWD as the fd argument does not properly fail with EBADF on some systems: glibc 2.11, Solaris 11.

Portability problems not fixed by Gnulib:

Some platforms lack the ability to change the timestamps of a file descriptor, so the replacement can fail with ENOSYS; the gnulib module ‘utimens’ provides a more reliable interface fdutimens.
The mere act of using stat modifies the access time of directories on some platforms, so utimensat can only effectively change directory modification time: Cygwin 1.5.x.