[PATCH v2 2/5] kernel-shark: Use new tracefs library

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>]

Link libtracefs to kernel-shark and use its API:
  tracefs_get_tracing_dir()

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 kernel-shark/CMakeLists.txt           |  3 ++-
 kernel-shark/build/FindTraceCmd.cmake | 30 +++++++++++++++++++++++++++
 kernel-shark/src/CMakeLists.txt       |  2 ++
 kernel-shark/src/KsCaptureDialog.cpp  |  4 ++--
 kernel-shark/src/libkshark.h          |  1 +
 5 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/kernel-shark/CMakeLists.txt b/kernel-shark/CMakeLists.txt
index 20478b9..8786b83 100644
--- a/kernel-shark/CMakeLists.txt
+++ b/kernel-shark/CMakeLists.txt
@@ -76,7 +76,8 @@ endif (CMAKE_BUILD_TYPE MATCHES Package)
 include_directories(${KS_DIR}/src/
                     ${KS_DIR}/build/src/
                     ${JSONC_INCLUDE_DIR}
-                    ${TRACECMD_INCLUDE_DIR})
+                    ${TRACECMD_INCLUDE_DIR}
+                    ${TRACEFS_INCLUDE_DIR})
 
 message("")
 message(STATUS "C flags      : " ${CMAKE_C_FLAGS})
diff --git a/kernel-shark/build/FindTraceCmd.cmake b/kernel-shark/build/FindTraceCmd.cmake
index d3e145c..f27fafe 100644
--- a/kernel-shark/build/FindTraceCmd.cmake
+++ b/kernel-shark/build/FindTraceCmd.cmake
@@ -6,6 +6,8 @@
 #  TRACEEVENT_FOUND, If false, do not try to use traceevent.
 #
 #  TRACECMD_INCLUDE_DIR, where to find trace-cmd header.
+#  TRACEFS_INCLUDE_DIR, where to find tracefs header.
+#  TRACEFS_LIBRARY, the tracefs library.
 #  TRACECMD_LIBRARY, the trace-cmd library.
 #  TRACECMD_FOUND, If false, do not try to use trace-cmd.
 
@@ -31,12 +33,21 @@ find_path(TRACECMD_INCLUDE_DIR  NAMES  trace-cmd/trace-cmd.h
                                 PATHS  $ENV{TRACE_CMD}/include/
                                        ${CMAKE_SOURCE_DIR}/../include/
                                 NO_DEFAULT_PATH)
+find_path(TRACEFS_INCLUDE_DIR   NAMES  tracefs/tracefs.h
+                                PATHS  $ENV{TRACE_CMD}/include/
+                                       ${CMAKE_SOURCE_DIR}/../include/
+                                NO_DEFAULT_PATH)
 
 find_library(TRACECMD_LIBRARY   NAMES  trace-cmd/libtracecmd.a
                                 PATHS  $ENV{TRACE_CMD}/lib/
                                        ${CMAKE_SOURCE_DIR}/../lib/
                                 NO_DEFAULT_PATH)
 
+find_library(TRACEFS_LIBRARY    NAMES  trace-cmd/libtracefs.a
+                                PATHS  $ENV{TRACE_CMD}/lib/
+                                       ${CMAKE_SOURCE_DIR}/../lib/
+                                NO_DEFAULT_PATH)
+
 find_library(TRACEEVENT_LIBRARY NAMES  traceevent/libtraceevent.a
                                 PATHS  $ENV{TRACE_CMD}/lib/
                                        ${CMAKE_SOURCE_DIR}/../lib/
@@ -46,7 +57,9 @@ find_library(TRACEEVENT_LIBRARY NAMES  traceevent/libtraceevent.a
 # search was successful "find_path" will do nothing this time.
 find_program(TRACECMD_EXECUTABLE   NAMES  trace-cmd)
 find_path(TRACECMD_INCLUDE_DIR  NAMES  trace-cmd/trace-cmd.h)
+find_path(TRACEFS_INCLUDE_DIR   NAMES  tracefs/tracefs.h)
 find_library(TRACECMD_LIBRARY   NAMES  trace-cmd/libtracecmd.so)
+find_library(TRACEFS_LIBRARY    NAMES  tracefs/libtracefs.so)
 find_library(TRACEEVENT_LIBRARY NAMES  traceevent/libtraceevent.so)
 
 IF (TRACECMD_INCLUDE_DIR AND TRACECMD_LIBRARY)
@@ -65,6 +78,23 @@ ELSE (TRACECMD_FOUND)
 
 ENDIF (TRACECMD_FOUND)
 
+IF (TRACEFS_INCLUDE_DIR AND TRACEFS_LIBRARY)
+
+  SET(TRACEFS_FOUND TRUE)
+
+ENDIF (TRACEFS_INCLUDE_DIR AND TRACEFS_LIBRARY)
+
+IF (TRACEFS_FOUND)
+
+  MESSAGE(STATUS "Found tracefs: ${TRACEFS_LIBRARY}")
+
+ELSE (TRACEFS_FOUND)
+
+  MESSAGE(FATAL_ERROR "\nCould not find tracefs!\n")
+
+ENDIF (TRACEFS_FOUND)
+
+
 IF (TRACEEVENT_LIBRARY)
 
   SET(TRACEEVENT_FOUND TRUE)
diff --git a/kernel-shark/src/CMakeLists.txt b/kernel-shark/src/CMakeLists.txt
index e20a030..33b5db8 100644
--- a/kernel-shark/src/CMakeLists.txt
+++ b/kernel-shark/src/CMakeLists.txt
@@ -9,6 +9,7 @@ add_library(kshark SHARED libkshark.c
 
 target_link_libraries(kshark ${TRACEEVENT_LIBRARY}
                              ${TRACECMD_LIBRARY}
+                             ${TRACEFS_LIBRARY}
                              ${JSONC_LIBRARY}
                              ${CMAKE_DL_LIBS})
 
@@ -69,6 +70,7 @@ if (Qt5Widgets_FOUND AND Qt5Network_FOUND)
                                      Qt5::Network
                                      ${TRACEEVENT_LIBRARY}
                                      ${TRACECMD_LIBRARY}
+                                     ${TRACEFS_LIBRARY}
                                      ${CMAKE_DL_LIBS})
 
     set_target_properties(kshark-gui PROPERTIES  SUFFIX ".so.${KS_VERSION_STRING}")
diff --git a/kernel-shark/src/KsCaptureDialog.cpp b/kernel-shark/src/KsCaptureDialog.cpp
index ad05917..548b6fb 100644
--- a/kernel-shark/src/KsCaptureDialog.cpp
+++ b/kernel-shark/src/KsCaptureDialog.cpp
@@ -26,7 +26,7 @@ extern "C" {
 
 static inline tep_handle *local_events()
 {
-	return tracecmd_local_events(tracecmd_get_tracing_dir());
+	return tracecmd_local_events(tracefs_get_tracing_dir());
 }
 
 /**
@@ -204,7 +204,7 @@ QStringList KsCaptureControl::_getPlugins()
 	QStringList pluginList;
 	char **all_plugins;
 
-	all_plugins = tracecmd_local_plugins(tracecmd_get_tracing_dir());
+	all_plugins = tracecmd_local_plugins(tracefs_get_tracing_dir());
 
 	if (!all_plugins)
 		return pluginList;
diff --git a/kernel-shark/src/libkshark.h b/kernel-shark/src/libkshark.h
index 3407db1..b05aa90 100644
--- a/kernel-shark/src/libkshark.h
+++ b/kernel-shark/src/libkshark.h
@@ -28,6 +28,7 @@ extern "C" {
 #include "trace-cmd/trace-cmd.h"
 #include "trace-cmd/trace-filter-hash.h"
 #include "traceevent/event-parse.h"
+#include "tracefs/tracefs.h"
 
 // KernelShark
 #include "libkshark-plugin.h"
-- 
2.24.1