Hi,dev-list
It seems work well if there is only one tracepoint file(sample_tracepoint.h)
including in app .i.esample_tracepoint.h#undef TRACEPOINT_PROVIDER
#define TRACEPOINT_PROVIDER sample
#if !defined(SAMPLE_TRACEPOINT_H) || defined(TRACEPOINT_HEADER_MULTI_READ)
#define SAMPLE_TRACEPOINT_H
#include <lttng/tracepoint.h>
TRACEPOINT_EVENT(
sample,
bytes_in, // C++ Style comment
TP_ARGS(char *, text),
TP_FIELDS(
ctf_string(message, text)
)
)
#endif /* SAMPLE_TRACEPOINT_H */
#undef TRACEPOINT_INCLUDE
#define TRACEPOINT_INCLUDE "./sample_tracepoint.h"
#include <lttng/tracepoint-event.h>
sample.c#include <unistd.h>
#define TRACEPOINT_DEFINE
#define TRACEPOINT_CREATE_PROBES
#include "sample_tracepoint.h"
int main(int argc, char **argv)
{
int i = 0;
for (i = 0; i < 100000; i++) {
tracepoint(sample, bytes_in, "bytes in");
sleep(1);
}
return 0;
}
compile: gcc -I. -o sample sample.c -ldl -llttng-ustHowever,If one more
tracepoint include file(sample_tracepoint2.h) added in app,compile
failed.sample_tracepoint2.h#undef TRACEPOINT_PROVIDER
#define TRACEPOINT_PROVIDER sample2
#if !defined(SAMPLE_TRACEPOINT2_H) || defined(TRACEPOINT_HEADER_MULTI_READ)
#define SAMPLE_TRACEPOINT2_H
#include <lttng/tracepoint.h>
TRACEPOINT_EVENT(
sample2,
bytes_in, // C++ Style comment
TP_ARGS(char *, text),
TP_FIELDS(
ctf_string(message, text)
)
)
#endif /* SAMPLE_TRACEPOINT2_H */
#undef TRACEPOINT_INCLUDE
#define TRACEPOINT_INCLUDE "./sample_tracepoint2.h"
#include <lttng/tracepoint-event.h>
sample.c#include <unistd.h>
#define TRACEPOINT_DEFINE
#define TRACEPOINT_CREATE_PROBES
#include "sample_tracepoint.h"
#include "sample_tracepoint2.h"
int main(int argc, char **argv)
{
int i = 0;
for (i = 0; i < 100000; i++) {
tracepoint(sample, bytes_in, "bytes in");
tracepoint(sample2, bytes_in, "bytes in");
sleep(1);
}
return 0;
}
compile:gcc -I. -o sample sample.c -ldl -llttng-ustsample.c: In function˜main:
sample.c:12: error: __tracepoint_sample2___bytes_in undeclared (first use in
this function)
sample.c:12: error: (Each undeclared identifier is reported only once
sample.c:12: error: for each function it appears in.) Does LTTng support
compiling multiple tracepoint sources with app directly? Yes,I can compile
multiple tracepoint providers to share libs and link them to app through
TRACEPOINT_PROBE_DYNAMIC_LINKAGE such as what doc/examples/demo does.
Thankszhenyu.ren
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