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// 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"
"os"
"syscall"
)
func (p *Pair) LoadFromAt(fd uintptr, sz int, off int64) (int, error) {
n, err := syscall.Splice(int(fd), &off, p.w, nil, sz, 0)
return int(n), err
}
func (p *Pair) LoadFrom(fd uintptr, sz int) (int, error) {
if sz > p.size {
return 0, fmt.Errorf("LoadFrom: not enough space %d, %d",
sz, p.size)
}
n, err := syscall.Splice(int(fd), nil, p.w, nil, sz, 0)
if err != nil {
err = os.NewSyscallError("Splice load from", err)
}
return int(n), err
}
func (p *Pair) WriteTo(fd uintptr, n int) (int, error) {
m, err := syscall.Splice(p.r, nil, int(fd), nil, int(n), 0)
if err != nil {
err = os.NewSyscallError("Splice write", err)
}
return int(m), err
}
const _SPLICE_F_NONBLOCK = 0x2
func (p *Pair) discard() {
_, err := syscall.Splice(p.r, nil, int(devNullFD), nil, int(p.size), _SPLICE_F_NONBLOCK)
if err == syscall.EAGAIN {
// all good.
} else if err != nil {
panic(err)
}
}
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