[Ltrace-devel] ltrace v0.7.0-git: Session on a Freetz MIPSEL router box

["Jackie Yeh [葉龍泉]"]

> "Jackie Yeh [葉龍泉]" <jackieontravel at gmail.com> writes:
>
> > Hi Petr,
> >
> > I applied your patch, and attached the log with -D77 option.
> >
> > :: fetch_rd32: couldn't read 20 bytes from (nil)
> > It's strange that 'addr' is a NULL pointer!
>
> Indeed.  It loads 0 from DT_DEBUG.  What libc are you using?  It seems
> like uClibc doesn't set DT_DEBUG so as not to dirty pages.
It's libuClibc-0.9.32.so
-rwxrwxr-x    1 root     root        725164 Sep 25 18:38 /lib/libuClibc-0.9.32.so


>
> Several backup plans are possible: we could look for _r_debug (which
> seems to be named _dl_debug_addr in uClibc land) in the binary of
> dynamic linker.  Failing that, the brute force solution is to watch mmap
> ad munmap system calls and re-parse /proc/pid/maps on any of these.
>
> Thanks,
> PM
>