TRACEPOINT_EVENT(
/*
* provider name, not a variable but a string starting with a
- * letter and containing either letters, numbers or underscores.
+ * letter and containing either letters, numbers or underscores.
* Needs to be the same as TRACEPOINT_PROVIDER. Needs to
* follow the namespacing guide-lines in lttng/tracepoint.h:
- *
- * Must be included before include tracepoint provider
+ *
+ * Must be included before include tracepoint provider
* ex.: project_event
* ex.: project_component_event
*
/*
* tracepoint name, same format as sample provider. Does not
* need to be declared before. in this case the name is
- * "message"
+ * "message"
*/
message,
/*
- * TP_ARGS macro contains the arguments passed for the tracepoint
+ * TP_ARGS macro contains the arguments passed for the tracepoint
* it is in the following format
* TP_ARGS(type1, name1, type2, name2, ... type10,
name10)
- * where there can be from zero to ten elements.
- * typeN is the datatype, such as int, struct or double **.
+ * where there can be from zero to ten elements.
+ * typeN is the datatype, such as int, struct or double **.
* name is the variable name (in "int myInt" the name would be
- * myint)
+ * myint)
* TP_ARGS() is valid to mean no arguments
* TP_ARGS(void) is valid too
*/
double, doublearg, float, floatarg),
/*
- * TP_FIELDS describes how to write the fields of the trace event.
+ * TP_FIELDS describes how to write the fields of the trace event.
* You can put expressions in the "argument expression" area,
* typically using the input arguments from TP_ARGS.
*/
/*
* ctf_array: a statically-sized array.
* args: (type, field name, argument expression, value)
- */
+ */
ctf_array(long, arrfield1, values, 3)
/*
* a string. No need to be terminated by a null
* character.
* Behavior is undefined if "text" argument is NULL.
- */
+ */
ctf_array_text(char, arrfield2, text, 10)
/*
* be preferred to "char", since the signedness of
* "char" is implementation-defined.
* Behavior is undefined if "text" argument is NULL.
- */
+ */
ctf_sequence(char, seqfield1, text,
size_t, textlen)
The loglevels go from 0 to 14. Higher numbers imply the most verbosity
(higher event throughput expected.
-
+
Loglevels 0 through 6, and loglevel 14, match syslog(3) loglevels
semantic. Loglevels 7 through 13 offer more fine-grained selection of
debug information.
-
+
TRACE_EMERG 0
system is unusable
-
+
TRACE_ALERT 1
action must be taken immediately
-
+
TRACE_CRIT 2
critical conditions
-
+
TRACE_ERR 3
error conditions
-
+
TRACE_WARNING 4
warning conditions
-
+
TRACE_NOTICE 5
normal, but significant, condition
-
+
TRACE_INFO 6
informational message
-
+
TRACE_DEBUG_SYSTEM 7
debug information with system-level scope (set of programs)
-
+
TRACE_DEBUG_PROGRAM 8
debug information with program-level scope (set of processes)
-
+
TRACE_DEBUG_PROCESS 9
debug information with process-level scope (set of modules)
-
+
TRACE_DEBUG_MODULE 10
debug information with module (executable/library) scope (set of
units)
-
+
TRACE_DEBUG_UNIT 11
debug information with compilation unit scope (set of functions)
-
+
TRACE_DEBUG_FUNCTION 12
debug information with function-level scope
-
+
TRACE_DEBUG_LINE 13
debug information with line-level scope (TRACEPOINT_EVENT default)
-
+
TRACE_DEBUG 14
debug-level message (trace_printf default)
library with "\-llttng-ust".
- Include the tracepoint provider header into all C files using
the provider.
- - Example:
- - tests/hello/ hello.c tp.c ust_tests_hello.h Makefile.example
+ - Examples:
+ - doc/examples/easy-ust/ sample.c sample_component_provider.h tp.c
+ Makefile
+ - doc/examples/hello-static-lib/ hello.c tp.c ust_test_hello.h Makefile
2) Compile the Tracepoint Provider separately from the application,
using dynamic linking:
needed. Another way is to dlopen the tracepoint probe when needed
by the application.
- Example:
- - doc/examples/demo demo.c tp*.c ust_tests_demo*.h demo-trace
+ - doc/examples/demo demo.c tp*.c ust_tests_demo*.h demo-trace Makefile
- Note about dlclose() usage: it is not safe to use dlclose on a
provider shared object that is being actively used for tracing due
projects / lttng-ust.git / blobdiff