Ian, Thanks for this.
On Tue, Sep 24, 2019 at 07:28:29AM +0800, Ian Campbell wrote: > On Fri, 2019-09-20 at 10:16 +0100, Mark Hindley wrote: > Would it be any help at all of the "dbus client-ish" bits and the > "direct API-ish" bits of the two libraries were split up into two > separate libraries? i.e. would that allow the c/r/p replacement of one > of the two libraries (AIUI the API one is the more problematic) to be > pushed further up the dependency stack? I think that is what we already have (if I have understood you correctly). The dbus components are in systemd/elogind and the sd-*(3) APIs are in libsystemd0/libelogind0. Or have I misunderstood? > Has anyone investigated late dynamic binding using a stub library which > merely determines which init is running and then dlopens the > appropriate libsystemd0 of libelogind0 library and forwards the calls > to it? > I don't know if the dynamic linker could be coerced into doing the > selection automagically, in a way similar to how the hwcap stuff can be > used to pickup versions of libraries optimised for different classes of > processor. hwcap is provided by the kernel so I think can't be used > directly, but maybe there is a parallel mechanism somewhere? I think Adam Borowski suggested somthing similar a while ago as an option, but I am not aware of anything more than an idea. I also experimented with LD_PRELOAD a while ago. But it felt very hackish. Mark
