Function device_sysctl_handler

freebsd/kern/subr_bus.c:259–291

};

static int
device_sysctl_handler(SYSCTL_HANDLER_ARGS)
{
	struct sbuf sb;
	device_t dev = (device_t)arg1;
	int error;

	sbuf_new_for_sysctl(&sb, NULL, 1024, req);
	sbuf_clear_flags(&sb, SBUF_INCLUDENUL);
	switch (arg2) {
	case DEVICE_SYSCTL_DESC:
		sbuf_cat(&sb, dev->desc ? dev->desc : "");
		break;
	case DEVICE_SYSCTL_DRIVER:
		sbuf_cat(&sb, dev->driver ? dev->driver->name : "");
		break;
	case DEVICE_SYSCTL_LOCATION:
		bus_child_location_sb(dev, &sb);
		break;
	case DEVICE_SYSCTL_PNPINFO:
		bus_child_pnpinfo_sb(dev, &sb);
		break;
	case DEVICE_SYSCTL_PARENT:
		sbuf_cat(&sb, dev->parent ? dev->parent->nameunit : "");
		break;
	default:
		sbuf_delete(&sb);
		return (EINVAL);
	}
	error = sbuf_finish(&sb);
	sbuf_delete(&sb);
	return (error);
}

static void
device_sysctl_init(device_t dev)