usbmuxd_subscribe call back didn't call

[piaojin]

I try to call usbmuxd_subscrib： int res = usbmuxd_subscribe(usbmux_event_cb, NULL); And res = 0, but won't call usbmux_event_cb. 'usbmuxd_events_subscribe' API has the same issue.

static void usbmux_event_cb(const usbmuxd_event_t *event, void *user_data) {

}

Xcode 11.4 MacOS 10.15.4

[piaojin]

I found "device_monitor" didn't call. The debug code is "USBMUXD_API int usbmuxd_events_subscribe(usbmuxd_subscription_context_t *ctx, usbmuxd_event_cb_t callback, void *user_data)" line "int res = thread_new(&devmon, device_monitor, NULL);".

[piaojin]

I have updated libimobiledevice, libplist, libusbmuxd, openssl and usbmuxd to the lastest version.

[nikias]

What are you doing after calling usbmuxd_subscribe? Remember this runs in a new thread so if you don't wait in the main thread (or the thread you call usbmuxd_subscribe from) it won't get a chance to call the callback function.

[piaojin]

@nikias I call usbmuxd_subscribe in the main thread. And I just updated libimobiledevice, libplist, libusbmuxd, openssl and usbmuxd to the lastest version.

[piaojin]

@nikias This is MacApp demo. Call usbmuxd_subscribe in applicationDidFinishLaunching. And the callback function "usbmux_event_cb" didn't be called. MacDemo.zip

[nikias]

Hmm maybe it can't connect to /var/run/usbmuxd socket file? Also you are using static libs which is not really what LGPL license was meant for.

[nikias]

Oh actually you said device_monitor isn't called. Weird. Can you single step through usbmuxd_events_subscribe and see if it actually tries to call thread_new at all?

[piaojin]

@nikias I single-step debugging through usbmuxd_events_subscribe and thread_new was called. The res is 0.

[nikias]

Ok now break inside device_monitor here: https://github.com/libimobiledevice/libusbmuxd/blob/master/src/libusbmuxd.c#L1098 and see where it stops

[piaojin]

I break inside the start line of device_monitor, but the breakpoint didn't come to the start line of device_monitor. device_monitor didn't be called.

[nikias]

Well I guess this is because you are linking in the libraries as static libraries. If you compile shared libraries and use those it will probably work.

[piaojin]

Well I guess this is because you are linking in the libraries as static libraries. If you compile shared libraries and use those it will probably work.

Thanks, I will have a try.

[Glen-Bai]

@piaojin Did you solve this problem? I met it too

[piaojin]

@piaojin Did you solve this problem? I met it too

@Glen-Bai Sorry No.

[nikias]

See my assumption above why this doesn't work. I know the code works if done properly, it's being used in a lot of projects, for example in checkra1n app.