[PD] mrpeach/net iemnet and other way to get file from the net

[Martin Peach]

On 2014-02-12 11:13, Cyrille Henry wrote:
> hello,
>
> We are trying to get small text file from the internet using mrpeach net
> objects.
>
> there is some few crash. gdb backtrace gives :
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 0x7fff8cf81700 (LWP 31771)]
> 0x00007fffeab9fa94 in tcpclient_child_connect (w=0x7fffea88d010) at
> tcpclient.c:225
> 225        x->x_addr = ntohl(*(long *)hp->h_addr);
> (gdb) watchdog: signaling pd...
> watchdog: signaling pd...
> bt
> #0  0x00007fffeab9fa94 in tcpclient_child_connect (w=0x7fffea88d010) at
> tcpclient.c:225
> #1  0x00007ffff73a8f6e in start_thread (arg=0x7fff8cf81700) at
> pthread_create.c:311
> #2  0x00007ffff6ecf9cd in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
>
> (this is on ubuntu 13.10 linux 64 bit / pd 0.45 / mrpeach from svn, but
> osX gives the same kind of crash )
>
> iemnet object are not more stable.
>
>
> there are lot's of thread about this in the list. is there anything new,
> or something we can do to avoid crash?


I don't recall any threads about this kind of crash.
It looks like a 64-bit issue. If it really crashes at
x->x_addr = ntohl(*(long *)hp->h_addr);
then possibly the long type is too long or the h_addr field is not a 
long in 64-bit or h_addr is not properly initialized, so ntohl() looks 
in the wrong place and segfaults. I never get any such crashes on 32-bit 
systems, but so far I haven't tried it on 64-bit.


>
> or is there an other solution that would be cross platform (linux, osX,
> windows) and would allow a patch to download text file from a server?
>

You could probably make a single object with pdlua or pyext that does 
just that.

Martin

> thanks
> cheers
> Cyrille
>
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