whatcanGOwrong

go/pkg/mod/github.com/cilium/ebpf@v0.11.0/link/raw_tracepoint.go

@@ -0,0 +1,87 @@
+package link
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/cilium/ebpf"
+	"github.com/cilium/ebpf/internal/sys"
+)
+
+type RawTracepointOptions struct {
+	// Tracepoint name.
+	Name string
+	// Program must be of type RawTracepoint*
+	Program *ebpf.Program
+}
+
+// AttachRawTracepoint links a BPF program to a raw_tracepoint.
+//
+// Requires at least Linux 4.17.
+func AttachRawTracepoint(opts RawTracepointOptions) (Link, error) {
+	if t := opts.Program.Type(); t != ebpf.RawTracepoint && t != ebpf.RawTracepointWritable {
+		return nil, fmt.Errorf("invalid program type %s, expected RawTracepoint(Writable)", t)
+	}
+	if opts.Program.FD() < 0 {
+		return nil, fmt.Errorf("invalid program: %w", sys.ErrClosedFd)
+	}
+
+	fd, err := sys.RawTracepointOpen(&sys.RawTracepointOpenAttr{
+		Name:   sys.NewStringPointer(opts.Name),
+		ProgFd: uint32(opts.Program.FD()),
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	err = haveBPFLink()
+	if errors.Is(err, ErrNotSupported) {
+		// Prior to commit 70ed506c3bbc ("bpf: Introduce pinnable bpf_link abstraction")
+		// raw_tracepoints are just a plain fd.
+		return &simpleRawTracepoint{fd}, nil
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &rawTracepoint{RawLink{fd: fd}}, nil
+}
+
+type simpleRawTracepoint struct {
+	fd *sys.FD
+}
+
+var _ Link = (*simpleRawTracepoint)(nil)
+
+func (frt *simpleRawTracepoint) isLink() {}
+
+func (frt *simpleRawTracepoint) Close() error {
+	return frt.fd.Close()
+}
+
+func (frt *simpleRawTracepoint) Update(_ *ebpf.Program) error {
+	return fmt.Errorf("update raw_tracepoint: %w", ErrNotSupported)
+}
+
+func (frt *simpleRawTracepoint) Pin(string) error {
+	return fmt.Errorf("pin raw_tracepoint: %w", ErrNotSupported)
+}
+
+func (frt *simpleRawTracepoint) Unpin() error {
+	return fmt.Errorf("unpin raw_tracepoint: %w", ErrNotSupported)
+}
+
+func (frt *simpleRawTracepoint) Info() (*Info, error) {
+	return nil, fmt.Errorf("can't get raw_tracepoint info: %w", ErrNotSupported)
+}
+
+type rawTracepoint struct {
+	RawLink
+}
+
+var _ Link = (*rawTracepoint)(nil)
+
+func (rt *rawTracepoint) Update(_ *ebpf.Program) error {
+	return fmt.Errorf("update raw_tracepoint: %w", ErrNotSupported)
+}