Lennart Poettering
893220f62f
There's some unclarity whether major/minor of device nodes are supposed to be "unsigned" or "dev_t". Various codebases assume the latter, but glibc's major()/minor() types actually return a value typed to "unsigned". On glibc dev_t is actually 64bit even if the kernel only exposes 32bit. Hence this distinction kinda matters. Let's clean things up a bit with handling: let's followe glibc's type system here, and use unsigned (and not int). Also let's pass invalid major/minor values around as UINT_MAX rather than via pointers, to match how we usually do this, and to shorten our code a bit. This is safe, since given the linux dev_t space being 32bit only we can't possibly have a valid major or minor this hight, given they must be smaller in size. While other archs disagree on the types of major/minor, they also tend to have similar limits. In fact on FreeBSD for example major()/minor() returns a signed int. Which would hence also mean that UINT_MAX cannot be a valid major or minor.
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