DOS ain't dead - User exception handler in C

User exception handler in C (Developers)

posted by tkchia , 19.08.2020, 18:52

Hello Laaca,

> The setting the my handler is in the source: "signal(SIGILL, catch_rdtsc)"
> but it would be nice to call something like "signal(SIGILL, orig_handler)"

The POSIX function sigaction(...) allows one to retrieve the originally active signal handler and action information. Apparently Free Pascal calls it fpSigAction: https://www.freepascal.org/docs-html/rtl/baseunix/fpsigaction.html .

And yes, if you are sure that no other routine in your program is trying to hook SIGILL at that point, you can probably get away with signal(SIGILL, SIG_DFL). :-)

Thank you!

---
https://gitlab.com/tkchia · https://codeberg.org/tkchia · 😴 "MOV AX,0D500H+CMOS_REG_D+NMI"

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Complete thread:

User exception handler in C - RayeR, 24.07.2020, 13:15
- User exception handler in C - Japheth, 24.07.2020, 18:07
- User exception handler in C - Rugxulo, 24.07.2020, 18:39
- User exception handler in C - tkchia, 24.07.2020, 20:47
  - User exception handler in C - RayeR, 30.07.2020, 13:18
    - User exception handler in C - tom, 30.07.2020, 23:54
      - User exception handler in C - RayeR, 01.08.2020, 02:13
        User exception handler in C - Laaca, 16.08.2020, 21:27
        User exception handler in C - Laaca, 16.08.2020, 22:38
        User exception handler in C - Rugxulo, 17.08.2020, 22:35
        User exception handler in C - marcov, 18.08.2020, 12:23
        User exception handler in C - Laaca, 18.08.2020, 20:15
        User exception handler in C - Rugxulo, 19.08.2020, 19:44
        User exception handler in C - Laaca, 19.08.2020, 21:50
        User exception handler in C - Rugxulo, 23.08.2020, 17:32
        User exception handler in C - Japheth, 23.08.2020, 20:36
        User exception handler in C - Rugxulo, 17.08.2020, 22:26
        User exception handler in C - tkchia, 19.08.2020, 18:52
        User exception handler in C - marcov, 20.08.2020, 00:00
        User exception handler in C - Laaca, 20.08.2020, 15:31
    - User exception handler in C - tkchia, 31.07.2020, 19:36
      - User exception handler in C - RayeR, 01.08.2020, 02:16
- User exception handler in C - Guti, 27.07.2020, 08:22