From 406f0526b9e2961669cad16f0b36d38bf2af17f3 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Fri, 9 Feb 2024 01:06:55 +0200
Subject: use log package everywhere

---
 internal/tracepoints/syscalls.go |  1 +
 main.go                          | 29 ++++++++++-------------------
 2 files changed, 11 insertions(+), 19 deletions(-)

diff --git a/internal/tracepoints/syscalls.go b/internal/tracepoints/syscalls.go
index 51f4d94..4cfc9e0 100644
--- a/internal/tracepoints/syscalls.go
+++ b/internal/tracepoints/syscalls.go
@@ -27,6 +27,7 @@ func filterLines(lines []string) ([]string, error) {
 	return syscalls, nil
 }
 
+// Filter out all used syscall tracepoints from *.bpf.c
 func usedSyscalls() ([]string, error) {
 	var syscalls []string
 
diff --git a/main.go b/main.go
index 0f8342a..8c74f4f 100644
--- a/main.go
+++ b/main.go
@@ -6,7 +6,7 @@ import (
 	"bytes"
 	"encoding/binary"
 	"fmt"
-	"os"
+	"log"
 	"runtime"
 
 	"ioriotng/internal/tracepoints"
@@ -48,49 +48,41 @@ func resizeMap(module *bpf.Module, name string, size uint32) error {
 func main() {
 	bpfModule, err := bpf.NewModuleFromFile("main.bpf.o")
 	if err != nil {
-		fmt.Fprintln(os.Stderr, err)
-		os.Exit(-1)
+		log.Fatal(err)
 	}
 	defer bpfModule.Close()
 
 	if err = resizeMap(bpfModule, "events", 8192); err != nil {
-		fmt.Fprintln(os.Stderr, err)
-		os.Exit(-1)
+		log.Fatal(err)
 	}
 
 	err = bpfModule.BPFLoadObject()
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "Failed to load BPF object: %v\n", err)
-		os.Exit(-1)
+		log.Fatal(err)
 	}
 
 	if err := tracepoints.AttachSyscalls(bpfModule); err != nil {
-		fmt.Fprintf(os.Stderr, err.Error())
-		os.Exit(-1)
+		log.Fatal(err)
 	}
 
 	testerMap, err := bpfModule.GetMap("tester")
 	if err != nil {
-		fmt.Fprintln(os.Stderr, err)
-		os.Exit(-1)
+		log.Fatal(err)
 	}
 
 	if testerMap.Name() != "tester" {
-		fmt.Fprintln(os.Stderr, "wrong map")
-		os.Exit(-1)
+		log.Fatal("wrong map")
 	}
 
 	if testerMap.Type() != bpf.MapTypeHash {
-		fmt.Fprintln(os.Stderr, "wrong map type")
-		os.Exit(-1)
+		log.Fatal("wrong map type")
 	}
 
 	eventsChannel := make(chan []byte)
 	lostChannel := make(chan uint64)
 	pb, err := bpfModule.InitPerfBuf("events", eventsChannel, lostChannel, 1)
 	if err != nil {
-		fmt.Fprintln(os.Stderr, err)
-		os.Exit(-1)
+		log.Fatal(err)
 	}
 
 	pb.Poll(300)
@@ -98,8 +90,7 @@ func main() {
 	ev := <-eventsChannel
 	var e openatEvent
 	if err := binary.Read(bytes.NewReader(ev), binary.LittleEndian, &e); err != nil {
-		fmt.Fprintln(os.Stderr, err)
-		os.Exit(-1)
+		log.Fatal(err)
 
 	}
 
-- 
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