On Tue, Jul 21, 2009 at 2:52 AM, Matt Ingenthron<[email protected]> wrote: > > I have a USDT provider in memcached which is defined as either a positive > value returned or -1 if there is no result. From my DTrace script, the value > returned seems to be 4294967295 when I'm expecting a -1 so it seems to be > treating it as unsigned. The value is defined as an int in the USDT probe > and the program, and isainfo -b returns 64, though I am working with a 32-bit > binary. [ ... ] > > If I add a cast to the script, I get the expected behavior when the probe > fires: > > memcached*::command-* > { > printf("key is %s, length is %d\n", copyinstr(arg1), (signed int) arg3); > } > > Why should this be necessary in this case?
The types for arg0, arg1, etc., are int64_t. In your case, you're trying to print a negative 32-bit value, which is a positive 64-bit value, thus the need for the cast. Chad _______________________________________________ dtrace-discuss mailing list [email protected]
