On 2023-05-18 10:10, Brian Hutchinson wrote:
[...]
I updated my hello world to have a function I'd like to use the
--userspace-probe method on with the very original name of
'probe_function':
#include <stdio.h>
#include <lttng/tracef.h>
void probe_function(int i);
int main(int argc, char *argv[])
{
unsigned int i;
puts("Hello, World!\nPress Enter to continue...");
/*
* The following getchar() call only exists for the purpose of this
* demonstration, to pause the application in order for you to have
* time to list its tracepoints. You don't need it otherwise.
*/
getchar();
lttng_ust_tracef("Number %d, string %s", 23, "hi there!");
printf("Number %d, string %s", 23, "hi there!");
for (i = 0; i < argc; i++) {
lttng_ust_tracef("Number %d, argv %s", i, argv[i]);
printf("Number %d, argv %s", i, argv[i]);
}
puts("Quitting now!");
probe_function(i);
return 0;
}
void probe_function(int i) {
lttng_ust_tracef("Number %d, string %s", i * i, "i^2");
printf("Number %d, string %s", i * i, "i^2");
}
... and I get the same error as before when I try to enable the probe:
# lttng enable-event --kernel
--userspace-probe=/usr/local/bin/hello:probe_function
Error: Missing event name(s).
As the error states, you are missing the event name. See
man 1 lttng-enable-event
lttng [GENERAL OPTIONS] enable-event --kernel
[--probe=SOURCE | --function=SOURCE | --syscall |
--userspace-probe=SOURCE]
[--filter=EXPR] [--session=SESSION]
[--channel=CHANNEL] EVENT[,EVENT]...
You will want something like:
lttng enable-event --kernel
--userspace-probe=/usr/local/bin/hello:probe_function my_probe_function
Where "my_probe_function" is the event name that will appear in the collected
traces.
Thanks,
Mathieu
--
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com
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