Re: PLEASE HELP regarding System Tap

["Khushboo Goel" <kgoel at usc dot edu>]

>
> > I am using System Tap for probing kernel function so that I can know
> > more about packet that are send over network. For this I need to
> > open a File so that I can save all raw data. I want to save this
> > data when I probing in the function, continuously.
>
> We don't have a C stdio-like facility in systemtap yet.  You can make
> your systemtap probe handler just printf(...), which will come out at
> the stap(run) command's stdout.  You can redirect that as you like
> (perhaps using the "-o" option).  Is that sufficient?
>  ------

     When i use -o option, it gives me buffer overflow error, i am
anyhow not printing anything on screen, i am using an aggregate
variable to store all information, but i have huge data around 50K
packets in one run ,which gives me overflow buffer , i also increased
the stack size but if i increase the number of packets i send over the
network, it gives me same error.
>
>
> > I using FILE *fp = NULL, to make file pointer, but its not allowing
> > to me do it.
>
> Right, that would be C code that's appropriate to run in a user-space
> program.  Systemtap probe scripts resemble C, but not that much.  Plus
> as any kernel-side code, they cannot just invoke user-space libraries
> like stdio.
>
>
> - FChE