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