Add copy_file_range support and tracepoint attach tests

1 files changed, 101 insertions, 0 deletions

diff --git a/internal/ior_test.go b/internal/ior_test.go
new file mode 100644
index 0000000..6495e76
--- /dev/null
+++ b/internal/ior_test.go
@@ -0,0 +1,101 @@
+package internal
+
+import (
+	"errors"
+	"strings"
+	"testing"
+)
+
+type fakeTracepointProgram struct {
+	attachCalls int
+	attachErr   error
+}
+
+func (p *fakeTracepointProgram) attachTracepoint(_, _ string) error {
+	p.attachCalls++
+	return p.attachErr
+}
+
+type fakeTracepointModule struct {
+	getProgramCalls []string
+	getProgramErrs  map[string]error
+	programs        map[string]*fakeTracepointProgram
+}
+
+func (m *fakeTracepointModule) getProgram(progName string) (tracepointProgram, error) {
+	m.getProgramCalls = append(m.getProgramCalls, progName)
+	if err, ok := m.getProgramErrs[progName]; ok {
+		return nil, err
+	}
+	if prog, ok := m.programs[progName]; ok {
+		return prog, nil
+	}
+	return nil, errors.New("missing program")
+}
+
+func TestAttachTracepointsWithSkipsFilteredTracepoints(t *testing.T) {
+	module := &fakeTracepointModule{
+		programs: map[string]*fakeTracepointProgram{
+			"handle_sys_enter_read":  {},
+			"handle_sys_enter_write": {},
+		},
+		getProgramErrs: map[string]error{},
+	}
+
+	err := attachTracepointsWith(module, func(tracepoint string) bool {
+		return tracepoint == "sys_enter_read"
+	}, []string{"sys_enter_read", "sys_enter_write"})
+	if err != nil {
+		t.Fatalf("attachTracepointsWith returned error: %v", err)
+	}
+
+	if len(module.getProgramCalls) != 1 || module.getProgramCalls[0] != "handle_sys_enter_read" {
+		t.Fatalf("getProgram calls = %v, want only handle_sys_enter_read", module.getProgramCalls)
+	}
+
+	if module.programs["handle_sys_enter_read"].attachCalls != 1 {
+		t.Fatalf("read attach calls = %d, want 1", module.programs["handle_sys_enter_read"].attachCalls)
+	}
+	if module.programs["handle_sys_enter_write"].attachCalls != 0 {
+		t.Fatalf("write attach calls = %d, want 0", module.programs["handle_sys_enter_write"].attachCalls)
+	}
+}
+
+func TestAttachTracepointsWithReturnsErrorWhenProgramMissing(t *testing.T) {
+	module := &fakeTracepointModule{
+		programs: map[string]*fakeTracepointProgram{},
+		getProgramErrs: map[string]error{
+			"handle_sys_enter_read": errors.New("not found"),
+		},
+	}
+
+	err := attachTracepointsWith(module, func(string) bool { return true }, []string{"sys_enter_read"})
+	if err == nil {
+		t.Fatal("attachTracepointsWith returned nil error, want non-nil")
+	}
+	if !strings.Contains(err.Error(), "handle_sys_enter_read") {
+		t.Fatalf("error %q does not mention handle_sys_enter_read", err)
+	}
+}
+
+func TestAttachTracepointsWithAttachFailureContinues(t *testing.T) {
+	module := &fakeTracepointModule{
+		programs: map[string]*fakeTracepointProgram{
+			"handle_sys_enter_read":  {attachErr: errors.New("no tracepoint")},
+			"handle_sys_enter_write": {},
+		},
+		getProgramErrs: map[string]error{},
+	}
+
+	err := attachTracepointsWith(module, func(string) bool { return true }, []string{"sys_enter_read", "sys_enter_write"})
+	if err != nil {
+		t.Fatalf("attachTracepointsWith returned error: %v", err)
+	}
+
+	if module.programs["handle_sys_enter_read"].attachCalls != 1 {
+		t.Fatalf("read attach calls = %d, want 1", module.programs["handle_sys_enter_read"].attachCalls)
+	}
+	if module.programs["handle_sys_enter_write"].attachCalls != 1 {
+		t.Fatalf("write attach calls = %d, want 1", module.programs["handle_sys_enter_write"].attachCalls)
+	}
+}