Hi Michael, On 02/24/2017 11:05 PM, Michael Biebl wrote: > Some years ago libsysfs (source package: sysfsutils) was written as an > abstraction layer for accessing /sys/. However, this turned out to be > a historical error and evolutionary dead end: It does not actually > abstract anything (it's just as specific to the Linux kernel and a > particular version thereof as /sys itself), and just adds unnecessary > complexity, RAM overhead, and bugs. Thus its development has ceased > years ago, in favor of programs just using /sys as it is. > > In fact, most applications probably don't want to access /sys at all, > but use libudev [1] or gudev [2] instead. These provide a better API > for device enumeration, properties, and callbacks for hardware > changes.
I can see how we ended up here, but it still does abstract something away: access to sysfs, avoiding bugs in accessing it from C in the process. Both this and s390-netdevice use libsysfs to iterate over devices on a specified bus, extracting and writing some attributes (stuff like "online" (r/w), "devtype" (r/o), "cutype" (r/o), setting the ccwgroup, layer2 and portno settings on Ethernet adapters). Is that something libudev would be suitable for? If so, it'd need to grow a udeb. Interestingly enough glib does have a udeb. Would that mean that gudev could be a potential option? Would that just require a udeb for udev and one for gudev (which has 40k on my system)? That might be more pleasant to work with. > This package is one of the few which still use the old libsysfs. Can > you please check with upstream to prepare a migration away from > libsysfs to using plain /sys or libudev? I hope that we can drop the > old libsysfs entirely for wheezy. Unfortunately for this and s390-netdevice there's no upstream to work with. > Thank you for considering! > > > [1] http://www.kernel.org/pub/linux/utils/kernel/hotplug/libudev/ This link is broken. > [2] http://www.kernel.org/pub/linux/utils/kernel/hotplug/gudev/ And so is this one. Kind regards Philipp Kern
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