Errno.current

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18

Very good point.

Is the following a safe sequence IRT proper errno handling?

    @inline(never)
    func readBytes(buffer: UnsafeMutableRawBufferPointer) throws -> Int {
        let size = Darwin.read(file, buffer.baseAddress, buffer.count)
        // *****************
        guard size >= 0 else {
            throw SomeError.errno(errno)
        }
        return size
    }

or is it possible there would some ARC code that could change errno in the marked line between Darwin call and errno reading?

(Just in case I've marked it as inline(never), not sure if that's necessary).