Add method to load plugins at trace-cmd report time

This adds a method to load a plugin. It looks in the users directory

  ~/.trace-cmd/plugins

and tries to load any file there. To create a plugin simply make
a C file that has this minimum format:

 #include "parse-events.h"

 int PEVENT_PLUGIN_LOADER(void)
 {
    ...
 }

Then compile it with the following method:

  gcc -c plugin.c -fPIC -o plugin.o
  gcc -shared -nostartfiles -o plugin

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 8 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index 473682d..c895ba7 100644
--- a/Makefile
+++ b/Makefile
@@ -4,12 +4,12 @@ EXT = -std=gnu99
 CFLAGS = -g -Wall # -O2
 INCLUDES = -I. -I/usr/local/include
 
-LIBS = -L. -lparsevent
+LIBS = -L. -lparsevent -ldl
 
 %.o: %.c
         $(CC) -c $(CFLAGS) $(EXT) $(INCLUDES) $< -o $@
 
-TARGETS = libparsevent.a trace-cmd
+TARGETS = libparsevent.a trace-cmd test_plugin
 
 all: $(TARGETS)
 
@@ -35,6 +35,12 @@ libparsevent.so: $(LIB_OBJS)
 libparsevent.a: $(LIB_OBJS)
         $(RM) $@;  $(AR) rcs $@ $^
 
+test_plugin.o: test_plugin.c parse-events.h
+        $(CC) -c $(CFLAGS) -fPIC -o $@ $<
+
+test_plugin: test_plugin.o
+        $(CC) -shared -nostartfiles -o $@ $<
+
 .PHONY: force
 force: