compat.libudev

// compat.libudev — behavioral test against /sys, no daemon.
//
// libudev-zero reads /sys directly instead of talking to udevd, which is the
// whole reason it is here: a subos has no udev daemon, and an implementation
// that needed one would work on a developer's machine and nowhere else. So the
// test enumerates REAL devices — that is the thing that would silently return
// nothing if the package were built wrong.

#ifdef __linux__

#include <libudev.h>

#include <dlfcn.h>
#include <cstdio>
#include <cstring>
#include <string>

namespace {
int failures = 0;
void check(bool ok, const char *what)
{
    std::printf("%-58s %s\n", what, ok ? "ok" : "FAILED");
// …