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    SubjectRe: ptrace single-stepping change breaks Wine
    > I'm getting the feeling that the question of whether to step into
    > signal handlers is orthogonal to single-stepping;

    No, it's not. You only ever step into a handler when you ask to.
    That's already the interface.

    > Platforms which don't implement PTRACE_SINGLESTEP would probably
    > appreciate this. A "single step" which stops you after setting up the
    > signal trampoline and adjusting the PC, before executing any
    > instructions in the handler.

    That's what PTRACE_SINGLESTEP with a nonzero signal number does since it
    was fixed.
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