#133 ✓resolved
Peter Johnson

UNW_FLAG_CHAININFO value is wrong

Reported by Peter Johnson | June 25th, 2011 @ 07:50 PM

Originally posted on Trac by appro@fy.chalmers.se
Original Trac Ticket

  Description

Reading modules/objfmts/coff/win64-except.c I could help noticing UNW_FLAG_CHAININFO defintion assigning value of 3. The correct value is 4, not 3. Well, it's not used anywhere for the moment, so it's not really a problem now. But it will naturally cause grief when you attempt to use it, so it makes sense to fix it.

As for what can go wrong. Note UNW_FLAG_[EU]HANDLER values. It's actually possible to combine these two to 2|1=3 and have same subroutine serve as exception and "termination" handler. The latter is one corresponding to finally in try/__finally construct in visual c. With value or 3 system will call handler first as exception handler and if it returns "not handled, keep looking" return code, the system will call it second time as "termination" handler. A.

Trac Attachments

h3. Trac Comments
comment:1

              Changed 3 years ago by peter


(In [2083]) Fix #138: Incorrect UNW_FLAG_CHAININFO value (currently unused).

      comment:1

                  Changed 3 years ago by peter

      Status
        changed from new to closed
    
      Resolution
        set to fixed

(In [2083]) Fix #138: Incorrect UNW_FLAG_CHAININFO value (currently unused).

      Status
        changed from new to closed
    
      Resolution
        set to fixed

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