Function hostname

nodedb/src/version.rs:41–52

Returns the hostname of the current machine. Uses `libc::gethostname`. Returns `"unknown"` on any error (buffer too small, non-UTF-8, or syscall failure). Never panics.

()

/// Uses `libc::gethostname`. Returns `"unknown"` on any error (buffer too small,
/// non-UTF-8, or syscall failure). Never panics.
pub fn hostname() -> String {
    // POSIX guarantees HOST_NAME_MAX + 1 bytes is sufficient (typically 256).
    // We use 256 to be safe across all platforms.
    let mut buf = vec![0u8; 256];
    let result = unsafe { libc::gethostname(buf.as_mut_ptr() as *mut libc::c_char, buf.len()) };
    if result != 0 {
        return "unknown".to_owned();
    }
    // Find the null terminator.
    let nul_pos = buf.iter().position(|&b| b == 0).unwrap_or(buf.len());
    String::from_utf8(buf[..nul_pos].to_vec()).unwrap_or_else(|_| "unknown".to_owned())
}

/// Returns the startup banner string.
///