Hello,
Someone provided me with an example of USDT usage that doesn't appear to work
right. Namely, 'long long' arguments get truncated when read into the DTrace
script.
Here is a quick example and the output:
> cat probetest.c
#include <stdio.h>
#include <sys/time.h>
#include <sys/sdt.h>
int main() {
long long v = 0x0FFFFFFF00000001LL;
printf("In the user process value = %llx\n",v);
DTRACE_PROBE1(testprov,getvalue,v);
return 0;
}
> cc -c probetest.c
> cat testprov.d
provider testprov {
probe getvalue(long long);
};
#pragma D attributes Evolving/Evolving/Common provider testprov provider
#pragma D attributes Private/Private/Unknown provider testprov module
#pragma D attributes Private/Private/Unknown provider testprov function
#pragma D attributes Evolving/Evolving/Common provider testprov name
#pragma D attributes Evolving/Evolving/Common provider testprov args
> dtrace -G -32 -s testprov.d probetest.o
> cc -o probetest testprov.o probetest.o
> cat test.d
testprov$target:::getvalue
{
printf("In the D script value = %llx\n",arg0);
}
> dtrace -s test.d -c ./probetest
dtrace: script 'test.d' matched 1 probe
In the user process value = fffffff00000001
dtrace: pid 22849 has exited
CPU ID FUNCTION:NAME
20 46997 main:getvalue In the D script value = 1
Anyone have any idea what I'm doing wrong here (if anything)?
--
- Keith
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