github.com/SandwichDev/go-internals@v0.0.0-20210605002614-12311ac6b2c5/syscall/unix/copy_file_range_linux.go (about)

     1  // Copyright 2020 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package unix
     6  
     7  import (
     8  	"syscall"
     9  	"unsafe"
    10  )
    11  
    12  func CopyFileRange(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int, err error) {
    13  	r1, _, errno := syscall.Syscall6(copyFileRangeTrap,
    14  		uintptr(rfd),
    15  		uintptr(unsafe.Pointer(roff)),
    16  		uintptr(wfd),
    17  		uintptr(unsafe.Pointer(woff)),
    18  		uintptr(len),
    19  		uintptr(flags),
    20  	)
    21  	n = int(r1)
    22  	if errno != 0 {
    23  		err = errno
    24  	}
    25  	return
    26  }