DOS ain't dead

UI21DEB deBUGGER released | inreentrant mess (Announce)

posted by Japheth , Germany (South), 02.03.2009, 07:48

> > Because your hook is inreentrant
>
> This would be a criminal BUG because it was supposed to be reentry-safe
>

Please calm down! "Will your TSR allow the debugger to single step into Int 21 without causing a mess?" was kind of a trick question. Correct answer is "No", but it's half of the truth only, the fully correct answer is "No, and I don't care at all, because it's your crappy debugger which is faulty"

The reason is simple: your code clears IF, which is a hint for any debugger that a critical section is entered which isn't allowed to be interrupted. The problem is that all DEBUGs ignore this signal - they aren't designed to debug "low-level" code.

You can make your code more tolerant by implementing cm's stack frame solution, but it's probably not worth the effort.

---
MS-DOS forever!

Complete thread:

• UI21DEB deBUGGER rele | DGJPP's persistent ENOENT bugginess - DOS386, 20.02.2009, 05:53 (Announce)
  • UI21DEB deBUGGER rele | DGJPP's persistent ENOENT bugginess - DOS386, 20.02.2009, 06:19
    • UI21DEB deBUGGER rele | DGJPP's persistent ENOENT bugginess - ecm, 20.02.2009, 20:19
      • UI21DEB deBUGGER rele | DGJPP's persistent ENOENT bugginess - DOS386, 24.02.2009, 06:02
        • UI21DEB deBUGGER rele | DGJPP's persistent ENOENT bugginess - Laaca, 24.02.2009, 10:28
        • UI21DEB deBUGGER rele | DGJPP's persistent ENOENT bugginess - rr, 24.02.2009, 21:43
          • UI21DEB deBUGGER rele | DGJPP's persistent ENOENT bugginess - DOS386, 25.02.2009, 03:06
            • UI21DEB deBUGGER rele | DGJPP's persistent ENOENT bugginess - ecm, 25.02.2009, 13:15
        • UI21DEB deBUGGER rele | DGJPP's persistent ENOENT bugginess - Japheth, 25.02.2009, 14:09
          • UI21DEB deBUGGER released | the mess - DOS386, 01.03.2009, 08:24
            • UI21DEB deBUGGER released | the mess - ecm, 01.03.2009, 10:40
              • UI21DEB deBUGGER released | inreentrant mess - DOS386, 01.03.2009, 13:59
                • UI21DEB deBUGGER released | inreentrant mess - ecm, 01.03.2009, 16:19
                • UI21DEB deBUGGER released | inreentrant mess - Japheth, 02.03.2009, 07:48
                  • UI21DEB deBUGGER released | inreentrant mess - ecm, 02.03.2009, 15:28
                    • UI21DEB deBUGGER released | inreentrant mess - Japheth, 03.03.2009, 07:52
                  • UI21DEB deBUGGER released | crappy and incrappy stuff - DOS386, 15.03.2009, 02:39
                    • UI21DEB deBUGGER released | crappy and incrappy stuff - Japheth, 15.03.2009, 08:17
                    • UI21DEB deBUGGER released | crappy and incrappy stuff - ecm, 15.03.2009, 21:02
    • UI21DEB deBUGGER rele | DGJPP's persistent ENOENT bugginess - Laaca, 20.02.2009, 20:21