Macro handle_eintr_errno

macro_rules! handle_eintr_errno {
    ($x:expr) => { ... };
}

Macro that retries the given expression every time its result indicates it was interrupted. It is intended to use with system functions that signal error by returning -1 and setting errno to appropriate error code (EINTR, EINVAL, etc.) Most of standard non-reentrant libc functions use this way of signalling errors.