make ioriotng able to run without .c source files present

1 files changed, 12 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 19460a8..8dc859e 100644
--- a/Makefile
+++ b/Makefile
@@ -14,8 +14,19 @@ bpfbuild:
 	make -C ./internal/c redo
 	if [ ! -e ioriotng.bpf.o ]; then cp -v ./internal/c/ioriotng.bpf.o .; fi
 
+.PHONY: tracepoint_list.go
+tracepoint_list.go:
+	# Fetch tracepoint probes from C code and generate list for Go userland code to auto-attach to.
+	echo "// Auto-generated from C, don't change manually!" > ./internal/tracepoints/tracepoint_list.go
+	echo 'package tracepoints' >> ./internal/tracepoints/tracepoint_list.go
+	echo >> ./internal/tracepoints/tracepoint_list.go
+	echo 'var tracepointList = []string{' >> ./internal/tracepoints/tracepoint_list.go
+	sed -n -E '/^SEC.*sys_(enter|exit)_/ { s/[")]//g; s/.*sys_(.*)/\t"\1",/; p; }' \
+		./internal/c/tracepoints/*.c >> ./internal/tracepoints/tracepoint_list.go
+	echo '}' >> ./internal/tracepoints/tracepoint_list.go
+
 .PHONY: gobuild
-gobuild:
+gobuild: tracepoint_list.go
 	go build -tags netgo -ldflags '-w -extldflags "-static"' -o ioriotng ./cmd/ioriotng/main.go
 
 .PHONY: clean