Re: ptrace code crash (now for real)

[manu%netbsd.org@localhost (Emmanuel Dreyfus)]

Kamil Rytarowski <n54%gmx.com@localhost> wrote:

> PT_DETACH resumes execution since address 0x0.
> 
> You need to specify (void *)1 to resume in the old position.

Ineed, this is documented in ptrace(2), and doing so it does not crash
anymore:
 
   PT_CONTINUE   
        The traced process continues execution.  addr is an address
        specifying the place where execution is to be resumed (a
        new value for the program counter), or (void *)1 to
       indicate that execution is to pick up where it left off.
(...)
   PT_DETACH     This request is like PT_CONTINUE, (...)

But this seems NetBSD specific. On Linux:

PTRACE_CONT
    Restart the stopped tracee process. If data is nonzero, it is    
    interpreted as the number of a signal to be delivered to the tracee;
    otherwise, no signal is delivered. Thus, for example, the tracer can
    control whether a signal sent to the tracee is delivered or not. 
    (addr is ignored.) 


-- 
Emmanuel Dreyfus
http://hcpnet.free.fr/pubz
manu%netbsd.org@localhost