Re: Converting int to a string in DTrace

Hi Mateusz:


I believe that lltostr might be what you're looking for?


         this->unit_number = args[1]->unit_number >= 0 ? 
lltostr(args[1]->unit_number) : "";


-- 
Domagoj

On 8/30/2022 4:49 PM, Mateusz Piotrowski wrote:
> Hello everyone,
>
> Is it possible to convert an int to a string in DTrace?
>
> E.g., I'd like the following script to work (it's an example from 
> dtrace_io(4), but with device unit number added):
>
>     #!/usr/sbin/dtrace -s
>
>     #pragma D option quiet
>
>     io:::start
>     {
>             this->unit_number = args[1]->unit_number >= 0 ?
>     (string)args[1]->unit_number : "";
>             @[args[1]->device_name, this->unit_number, execname, pid]
>     = sum(args[0]->bio_bcount);
>     }
>
>     END
>     {
>             printf("%10s%-3s %20s %10s %15s\n", "DEVICE", "", "APP",
>     "PID", "BYTES");
>             printa("%10s%-3s %20s %10d %15@d\n", @);
>     }
>
>
> (Of course, the `(string)` cast does not work here because it's just 
> not how DTrace works.)
>
> Best,
> Mateusz