Method is_block_device

block/src/lib.rs:724–735

(f: &File)

impl DiskTopology {
    fn is_block_device(f: &File) -> std::io::Result<bool> {
        let mut stat = std::mem::MaybeUninit::<libc::stat>::uninit();
        // SAFETY: FFI call with a valid fd and buffer
        let ret = unsafe { libc::fstat(f.as_raw_fd(), stat.as_mut_ptr()) };
        if ret != 0 {
            return Err(std::io::Error::last_os_error());
        }

        // SAFETY: stat is valid at this point
        let is_block = unsafe { (*stat.as_ptr()).st_mode & S_IFMT == S_IFBLK };
        Ok(is_block)
    }

    // libc::ioctl() takes different types on different architectures
    fn query_block_size(f: &File, block_size_type: BlockSize) -> std::io::Result<u64> {