| // Copyright 2018 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| // splice transfers data from r to c using the splice system call to minimize |
| // copies from and to userspace. c must be a TCP connection. Currently, splice |
| // is only enabled if r is a TCP or a stream-oriented Unix connection. |
| // If splice returns handled == false, it has performed no work. |
| func splice(c *netFD, r io.Reader) (written int64, err error, handled bool) { |
| var remain int64 = 1<<63 - 1 // by default, copy until EOF |
| lr, ok := r.(*io.LimitedReader) |
| if tc, ok := r.(*TCPConn); ok { |
| } else if uc, ok := r.(*UnixConn); ok { |
| written, handled, sc, err := poll.Splice(&c.pfd, &s.pfd, remain) |
| return written, wrapSyscallError(sc, err), handled |