Function openat2::supports_open_how

pub fn supports_open_how(how: &OpenHow) -> bool

Check whether the running kernel supports the given OpenHow structure.

This will return false if the running kernel either a) doesn’t support openat2() or b) doesn’t support the given how.

This can be useful for probing for the kernel’s support of specific flags, such as ResolveFlags::CACHED (added in kernel 5.12). However, this function may be slow, so it’s highly recommended to cache the result to avoid repeated syscalls.