There is a bug of libdispatch on my APP, which is similar to this post, but it's on iOS across versions from 13.x to 16.x. Now I downloaded the opensource code of libdispatch from here, and I want to look into the details of source code to figure out the root cause. How can I know the branch or commit of the libdispatch code the specific iOS version (like 15.6.1) uses. crash_info_0 BUG IN CLIENT OF LIBDISPATCH: Unexpected EV_VANISHED (do not destroy random mach ports or file descriptors) fault_address 0x0000000001a37b9bc4 mach_code 0x000000000000000001 mach_subcode 0x0000000001a37b9bc4 name EXC_BREAKPOINT (SIGTRAP) reason EXC_BREAKPOINT EXC_ARM_BREAKPOINT fault_address:0x00000001a37b9bc4 type MACH_Exception 0 libdispatch.dylib __dispatch_source_merge_evt.cold.1 (in libdispatch.dylib) +36 1 libdispatch.dylib __dispatch_source_merge_evt (in libdispatch.dylib) +192 2 libdispatch.dylib __dispatch_event_loop_merge (in libdispatch.dylib) +144 3 libdispatch.dylib __dispatch_workloop_worker_thread (in libdispatch.dylib) +392 4 libsystem_pthread.dylib __pthread_wqthread (in libsystem_pthread.dylib) +284 5 libsystem_pthread.dylib _start_wqthread (in libsystem_pthread.dylib) +4 By the way, what's the difference between "__dispatch_source_merge_evt.cold.1" and "__dispatch_source_merge_evt"

Hello everyone, Are there any APIs on iOS to resolve DNS via Cellular network when WiFi is also connected? As I connect my iPhone to WiFi, DNS will be resolved via WiFi not Cellular. Low level APIs are preferred. Thanks!

Hi Guys, I wrote an APP to transmit data through UNIX POSIX APIs, and if the mobile is connected to a WiFi, data will always be transmitted through the WiFi. I want to transmit data via cellular in some circumstances. For example, when the WiFi signal is poor, the APP will try to use cellular without turning off WiFi connection. Are there any ways to do this? Thanks!