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Re: x86 linux GDB and SIGALRM
- To: Jonathan Larmour <jlarmour at redhat dot co dot uk>
- Subject: Re: x86 linux GDB and SIGALRM
- From: Andrew Cagney <ac131313 at cygnus dot com>
- Date: Mon, 27 Mar 2000 20:00:57 +1000
- CC: gdb at sourceware dot cygnus dot com
- Organization: Cygnus Solutions
- References: <38DBF46A.8EABE9BF@redhat.co.uk>
Jonathan Larmour wrote:
>
> I have an x86 Linux program here that uses SIGALRM for regular periodic
> "interrupts". SIGVTALRM isn't really precise enough for it's needs.
>
> However I noticed that "si" doesn't work - it interferes with the ptrace/GDB
> interface. It seems that when ptrace(PTRACE_SINGLESTEP,...) returns, a
> SIGALRM is pending, and the single step gets lost.
>
> Now this works in GDB 4.18 so this is a regression. But does anyone have any
> clues as to what's *meant* to be going on here, and how I fix GDB?
Can anyone independantly confirm/deny this?
Andrew