![]() To that end, I had Parallels running on the Mac Mini I use in the shack. The problem of course is there are far more Ham radio apps for Windows machines. I used to run a Mac IT shop for the local university, and Macs have always been best for my personal interests in electronic music, photography and public speaking. I’ve dabbled some over the last few years, and even had a pretty complete Ham Radio Deluxe (HRD) installation working. If you want to do these operations safely, you need to close the sqlite database first.Lest you think I’m completely old-school or only work on old Ten Tec gear, I decided it was finally time to get on top of a digital mode like WSJT-X. There are a number of possible operations being detected including deleting the file out from underneath you, truncating the file out from underneath you, or unmounting the file system out from underneath you. It just ignores an error that is trying to tell you about a serious risk of file corruption. Statically linking a different sqlite library to suppress reporting of the error does not magically make SQLite support naked file operations out from underneath it. You should be properly responding to all errors returned from sqlite APIs. The recovery mechanism is as all SQLite I/O errors in which you are required to close the sqlite3* and open a new one. Whatever you are doing, the OSS SQLite library does not support it. These errors are not specific to Core Data. The error is the OS detecting that someone has performed an illegal file operation directly on your open database file out from underneath the SQLite API, which SQLite does not support and is a great way to corrupt your database as noted. Statically linking sqlite (using ) seems to fix it. Even if your code is sound, this error can happen randomly, and it's worse in iOS 13. TL DRĪpple doesn't advocate using the OS-provided SQLite directly in iOS. ![]() In a few weeks I'll know if including SQLite statically has completely removed even the rare failures I used to get prior. I have just completed adding the conveniently Xcode packaged SQLiteLib from. The first thread referenced above speculates that it might be related to memory-mapped file optimisation because vnodes are often used for that. It is hard to see how the code is "changing the file" (as suggested in the WWDC session). It is opened there directly as a read-only database and used lightly. ![]() Prior to this, I had seen this error occasionally in my iOS app both on a physical device and in the simulator when using Apple's provided SQLite library libsqlite3.tbd. Previously these automated tests (running on Xcode Server) had been quite stable. I've also seen it on my device with adhoc testing several times in a couple of days. The tests crash in SQLite with an extended error code of 6922 (while running the app in the simulator). Now, with Xcode 11.2 and iOS 13, I typically see 5 failures out of 485 XCTest UI tests. Prior to iOS 13 / Xcode 11, this happened rarely enough that I ignored it. If you're using SQLite directly, you want to make sure that there's only one piece of code that owns that database and that code needs to go into the exclusive file access so files can't be changed when they're open. The transcript of the talk accompanying that slide suggests: API calls after illegal operations will return SQLITE_IOERR_VNODEĪnd references the SQLite page howtocorrupt.html and the setting SQLITE_ENABLE_FILE_ASSERTIONS=1. SQLite now uses dispatch sources to track illegal file operations. "The code indicates that a file relevant to the call was invalidatedīy a dispatch vnode source event" but I do not understand what thatĪnd that thread contains further information and speculation about what might be causing the error.Īn Apple WWDC talk in 2016 Session 242 "What's New in Core Data" slide 184 ( pdf here) says: To SQLite implemented by Apple for use on MacOS and iOS. SQLITE_IOERR_VNODE is an error code used by proprietary modifications
0 Comments
Leave a Reply. |