42f0cc34fa
If Unwind_Backtrace is broken, ctx.n will still contain ~0, and we will
return that which poor behavior for the user, so return 0 instead.
We could document ~0 to be an error, but that would deviate from the
Linux behavior which is not desirable. Noted by Poul-Henning Kamp
PR: 209842
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| .. | ||
| backtrace.3 | ||
| backtrace.c | ||
| execinfo.h | ||
| symtab.c | ||
| symtab.h | ||
| unwind.c | ||