dtrace discuss - Jul 2005 - clearing element from array of struct

G''Day Folks,

This question should be a quickie - what''s the syntax to delete an
element
from an array of struct? (I''m being good and using structs now). eg,

   struct ioinfo {
           int uid;
           int pid;
           int ppid;
           string args;
           string comm;
           uint64_t time;
           char rw;
   };

   struct ioinfo start[uint64_t, uint64_t];

now if I try to zero an entry later on with,

   start[this->dev, this->blk] = 0;

I get,

   in action list: operands have incompatible types: "struct ioinfo" =
"int"

would zero''ing out each element one by one free memory like one would
hope, or have I just missed the right syntax? (I may have missed the
syntax - it''s almost 5am :).

thanks,

Brendan

> G''Day Folks,
> 
> This question should be a quickie - what''s the syntax to delete an
element
> from an array of struct? (I''m being good and using structs now).
eg,
> 
>    struct ioinfo {
>            int uid;
>            int pid;
>            int ppid;
>            string args;
>            string comm;
>            uint64_t time;
>            char rw;
>    };
> 
>    struct ioinfo start[uint64_t, uint64_t];
> 
> now if I try to zero an entry later on with,
> 
>    start[this->dev, this->blk] = 0;
> 
> I get,
> 
>    in action list: operands have incompatible types: "struct
ioinfo" = "int"
> 
> would zero''ing out each element one by one free memory like one
would
> hope, or have I just missed the right syntax? (I may have missed the
> syntax - it''s almost 5am :).
> 
> thanks,
> 
> Brendan
We don''t have one yet -- this is on my list of things to fix in the
near future.  It will either be assignment to zero or an undef() function.

-Mike

-- 
Mike Shapiro, Solaris Kernel Development. blogs.sun.com/mws/

G''Day Mike,

On Sat, 2 Jul 2005, Michael Shapiro wrote:
[...]
> >    start[this->dev, this->blk] = 0;
> >
> > I get,
> >
> >    in action list: operands have incompatible types: "struct
ioinfo" = "int"
> >
> > would zero''ing out each element one by one free memory like
one would
> > hope, or have I just missed the right syntax? (I may have missed the
> > syntax - it''s almost 5am :).
> >
> > thanks,
> >
> > Brendan
>
> We don''t have one yet -- this is on my list of things to fix in
the
> near future.  It will either be assignment to zero or an undef() function.
Ahh - thanks! I didn''t miss something silly :)

Brendan