Initial commit

Proof-of-concept implementation. Bugs will occur.

vendor/github.com/hanwen/go-fuse/v2/splice/pair.go

@@ -0,0 +1,70 @@
+//go:build linux
+
+// Copyright 2016 the Go-FUSE Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package splice
+
+import (
+	"fmt"
+	"syscall"
+)
+
+type Pair struct {
+	r, w int
+	size int
+}
+
+func (p *Pair) MaxGrow() {
+	for p.Grow(2*p.size) == nil {
+	}
+}
+
+func (p *Pair) Grow(n int) error {
+	if n <= p.size {
+		return nil
+	}
+	if !resizable {
+		return fmt.Errorf("splice: want %d bytes, but not resizable", n)
+	}
+	if n > maxPipeSize {
+		return fmt.Errorf("splice: want %d bytes, max pipe size %d", n, maxPipeSize)
+	}
+
+	newsize, errNo := fcntl(uintptr(p.r), F_SETPIPE_SZ, n)
+	if errNo != 0 {
+		return fmt.Errorf("splice: fcntl returned %v", errNo)
+	}
+	p.size = newsize
+	return nil
+}
+
+func (p *Pair) Cap() int {
+	return p.size
+}
+
+func (p *Pair) Close() error {
+	err1 := syscall.Close(p.r)
+	err2 := syscall.Close(p.w)
+	if err1 != nil {
+		return err1
+	}
+	return err2
+}
+
+func (p *Pair) Read(d []byte) (n int, err error) {
+	return syscall.Read(p.r, d)
+}
+
+func (p *Pair) Write(d []byte) (n int, err error) {
+	return syscall.Write(p.w, d)
+}
+
+func (p *Pair) ReadFd() uintptr {
+	return uintptr(p.r)
+}
+
+func (p *Pair) WriteFd() uintptr {
+	return uintptr(p.w)
+}