fix ListXattrRaw, add examples for listxattr and findxattr

examples/findxattr/main.go

@@ -0,0 +1,42 @@
+// Copyright (c) 2018 Versity Software, Inc.
+//
+// Use of this source code is governed by a BSD-3-Clause license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	scoutfs "github.com/versity/scoutfs-go"
+)
+
+func main() {
+	if len(os.Args) != 3 || os.Args[1] == "-h" {
+		fmt.Fprintln(os.Stderr, "usage:", os.Args[0], "<mount point> <xattr key>")
+		os.Exit(1)
+	}
+
+	f, err := os.Open(os.Args[1])
+	if err != nil {
+		log.Fatalf("open %v: %v", os.Args[1], err)
+	}
+
+	q := scoutfs.NewXattrQuery(f, os.Args[2])
+
+	for {
+		inodes, err := q.Next()
+		if err != nil {
+			log.Fatalf("Next(): %v", err)
+		}
+		if inodes == nil {
+			break
+		}
+		for _, inode := range inodes {
+			fmt.Println(inode)
+		}
+	}
+}

examples/listxattr/main.go

@@ -0,0 +1,42 @@
+// Copyright (c) 2018 Versity Software, Inc.
+//
+// Use of this source code is governed by a BSD-3-Clause license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	scoutfs "github.com/versity/scoutfs-go"
+)
+
+func main() {
+	if len(os.Args) != 2 || os.Args[1] == "-h" {
+		fmt.Fprintln(os.Stderr, "usage:", os.Args[0], "<filepath>")
+		os.Exit(1)
+	}
+
+	f, err := os.Open(os.Args[1])
+	if err != nil {
+		log.Fatalf("open %v: %v", os.Args[1], err)
+	}
+
+	lxr := scoutfs.NewListXattrRaw(f)
+
+	for {
+		attrs, err := lxr.Next()
+		if err != nil {
+			log.Fatalf("next(): %v", err)
+		}
+		if attrs == nil {
+			break
+		}
+		for _, attr := range attrs {
+			fmt.Println(attr)
+		}
+	}
+}

scoutfs.go

@@ -447,7 +447,7 @@ func (l *ListXattrRaw) Next() ([]string, error) {
 	buf := make([]byte, 256*1024)
 	l.lxr.buf = uintptr(unsafe.Pointer(&buf[0]))
 
-	n, err := scoutfsctl(l.f.Fd(), IOCFINDXATTRS, uintptr(unsafe.Pointer(&l.lxr)))
+	n, err := scoutfsctl(l.f.Fd(), IOCLISTXATTRRAW, uintptr(unsafe.Pointer(l.lxr)))
 	if err != nil {
 		return nil, err
 	}