pub fn load_config(path: &Path) -> Result<Config, ConfigError>Expand description
Load config from a file path.
Opens the file once and uses the same file descriptor for both the size check
and the read, eliminating the TOCTOU race that exists when metadata() and
read_to_string() open the file separately.
On Unix, O_NOFOLLOW rejects symlinks at the final path component, and O_NONBLOCK
prevents open() from blocking on a named pipe with no writer. Non-regular files
(device nodes, FIFOs) can bypass the size guard by reporting len() == 0, so they
are rejected via is_file() immediately after open.