[PATCH v3 14/46] tools/lib/traceevent: Man pages for tep_register_event_handler() and tep_unregister_event_handler()

[Tzvetomir Stoyanov <tstoyanov@vmware.com>]

Create man pages for tep_register_event_handler() and tep_unregister_event_handler()
as part of the libtraceevent APIs.

Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
---
 .../libtraceevent-reg_event_handler.txt       | 129 ++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 tools/lib/traceevent/Documentation/libtraceevent-reg_event_handler.txt

diff --git a/tools/lib/traceevent/Documentation/libtraceevent-reg_event_handler.txt b/tools/lib/traceevent/Documentation/libtraceevent-reg_event_handler.txt
new file mode 100644
index 000000000000..ee9aa3a4151b
--- /dev/null
+++ b/tools/lib/traceevent/Documentation/libtraceevent-reg_event_handler.txt
@@ -0,0 +1,129 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_register_event_handler,tep_unregister_event_handler -  Register / unregisters
+a callback function to parse an event information.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+enum *tep_reg_handler* {
+	_TEP_REGISTER_SUCCESS_,
+	_TEP_REGISTER_SUCCESS_OVERWRITE_,
+};
+
+int *tep_register_event_handler*(struct tep_handle pass:[*]_tep_, int _id_, const char pass:[*]_sys_name_, const char pass:[*]_event_name_, tep_event_handler_func _func_, void pass:[*]_context_);
+int *tep_unregister_event_handler*(struct tep_handle pass:[*]tep, int id, const char pass:[*]sys_name, const char pass:[*]event_name, tep_event_handler_func func, void pass:[*]_context_);
+
+typedef int (*pass:[*]tep_event_handler_func*)(struct trace_seq pass:[*]s, struct tep_record pass:[*]record, struct tep_event pass:[*]event, void pass:[*]context);
+--
+
+DESCRIPTION
+-----------
+The _tep_register_event_handler()_ function registers a handler function, 
+which is going to be called to parse the information for a given event. 
+The _tep_ argument is the trace event parser context. The _id_ argument is 
+the id of the event. The _sys_name_ argument is the name of the system, 
+the event belongs to. The _event_name_ argument is the name of the event.
+If _id_ is >= 0, it is used to find the event, otherwise _sys_name_ and 
+_event_name_ are used. The _func_ is a pointer to the function, which is going 
+to be called to parse the event information. The _context_ argument is a pointer
+to the context data, which will be passed to the _func_. If a handler function 
+for the same event is already registered, it will be overridden with the new 
+one. This mechanism allows a developer to override the parsing of a given event.
+If for some reason the default print format is not sufficient, the developer 
+can register a function for an event to be used to parse the data instead.
+
+The _tep_unregister_event_handler()_ function unregisters the handler function,
+previously registered with _tep_register_event_handler()_. The _tep_ argument 
+is the trace event parser context. The _id_, _sys_name_, _event_name_, _func_,
+and _context_ are the same arguments, as when the callback function _func_ was
+registered.
+
+The _tep_event_handler_func_ is the type of the custom event handler 
+function. The _s_ argument is the trace sequence, it can be used to create a 
+custom string, describing the event. A _record_  to get the event from is passed 
+as input parameter and also the _event_ - the handle to the record's event. The 
+_context_ is custom context, set when the custom event handler is registered. 
+ 
+RETURN VALUE
+------------
+The _tep_register_event_handler()_ function returns _TEP_REGISTER_SUCCESS_
+if the new handler is registered successfully or _TEP_REGISTER_SUCCESS_OVERWRITE_ if
+an existing handler is overwritten. If there is not  enough memory to complete 
+the registration, TEP_ERRNO__MEM_ALLOC_FAILED is returned. 
+
+The _tep_unregister_event_handler()_ function returns 0 if _func_ was removed 
+successful or, -1 if the event was not found.
+
+The _tep_event_handler_func_ should return -1 in case of an error, or 0 otherwise.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <event-parse.h>
+#include <trace-seq.h>
+...
+struct tep_handle *tep = tep_alloc();
+...
+int custom_event_handler(struct trace_seq *s, struct tep_record *record,
+			 struct tep_event *event, void *context) 
+{
+	trace_seq_printf(s, "kvm_exit event");
+	return 0;
+}
+...
+	if (tep_register_event_handler(tep, -1, "kvm", "kvm_exit",
+				   custom_event_handler, NULL)) {
+	/* Failed to register the handler for event "kvm_exit" from "kvm" system */
+	}
+...
+	if (tep_unregister_event_handler(pevent, -1, "kvm", "kvm_exit",
+				     custom_event_handler, NULL) != ) {
+	/* Failed to unregister the handler for event "kvm_exit" from "kvm" system */
+	}
+
+--
+
+FILES
+-----
+[verse]
+--
+*event-parse.h*
+	Header file to include in order to have access to the library APIs.
+*trace-seq.h*
+	Header file to include in order to have access to trace sequences related APIs.
+	Trace sequences are used to allow a function to call several other functions 
+	to create a string of data to use.
+*-ltraceevent*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+_libtraceevent(3)_, _trace-cmd(1)_
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtraceevent is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
-- 
2.19.1