x86 linux GDB and SIGALRM

[Jonathan Larmour]

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?

Jifl
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