Oh yeah! I had forgotten about ConsoleInput. (It's undocumented and I think it's generally considered archaic.) I know some early SLorK/PLorK pieces used Tcl/Tk GUIs outputting control numbers piped into ChucK. So I'm sure it's valid code, but I don't know how to debug it with GDB.

Joel

On 01/27/2015 04:33 PM, Gonzalo wrote:

This was a suggestion by Perry Cook, it's in chuck-users in a thread called "timestamps", Dec 14. The essence is:

ConsoleInput stdin;     // gonna read from here
stdin.prompt("") => now; // wait until something comes in
while (stdin.more())  {  stdin.getLine() => ...  } // read input

(fully working code in his post)

I'll try your way to see if I can do this with gdb. Thanks!


On 28/01/2015 9:21 am, Joel Matthys wrote:

Hmm... I've never piped anything into ChucK like that before. How does
ChucK access the timestamp?

Typically I would do something like that with an argument:

chuck wp.ck:`date +"%y%m%d-%T"`

and then access it in ChucK with me.arg(0) => string timestamp;

Joel

On 01/27/2015 03:27 PM, Gonzalo wrote:

Thanks Joel. One more hiccup: I start my chuck program with:

date +"%y%m%d-%T" | chuck wp.ck

(I need it to have a timestamp)

But I can't do that in gdb. I can disable the timestamp part in the
code, but just checking to see if this is possible.


On 28/01/2015 8:01 am, Joel Matthys wrote:

I assume you're on Linux or OSX. (If it's Windows, I'm clueless.)

For me on Ubuntu I type:

$ *gdb chuck*

and then once it starts up and I get the (gdb) prompt I type:

(gdb) *run my_chuck_file.ck*

Of course GDB slows down your system, A LOT, but you can keep it running
until it hits the segfault. The spew should (hopefully) point toward a
specific place in the chuck code that is the problem. (Type q to exit
gdb.) You might want to copy the error messages here for the devs to
look into.

Joel

On 01/27/2015 02:53 PM, Gonzalo wrote:

Never used gdb before, I'll read about this, but any pointers on how
to get started?


On 28/01/2015 7:39 am, Joel Matthys wrote:

It's hard to debug segfaults in the ChucK code itself. running gdb
chuck
might help narrow down the problem.

Joel

On 01/27/2015 02:31 PM, Gonzalo wrote:

Hi,

On a project I'm working on, I sometimes get a "Segmentation fault:
11" error, and the program crashes. But I can't figure out when it
happens, and cannot reproduce it. It's a big project, with many
components communicating via events, and I have no idea who's
triggering the problem. My question is how would you go about
debugging this? Any ideas what can be triggering it? It sounds very
generic...

Probably unrelated, but just in case, I also got this (only once so
far):

chuck(22226,0x7fff790ee310) malloc: *** error for object 0x1028f3408:
incorrect checksum for freed object - object was probably modified
after being freed.
*** set a breakpoint in malloc_error_break to debug
Abort trap: 6

Thanks!
Gonzalo
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