// 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.
package net
import (
"internal/poll"
"io"
)
// spliceFrom 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, spliceFrom is only enabled if r is a TCP or a stream-oriented Unix connection.
//
// If spliceFrom returns handled == false, it has performed no work.
func spliceFrom(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 ok {
remain, r = lr.N, lr.R
if remain <= 0 {
return 0, nil, true
}
}
var s *netFD
switch v := r.(type) {
case *TCPConn:
s = v.fd
case tcpConnWithoutWriteTo:
s = v.fd
case *UnixConn:
if v.fd.net != "unix" {
return 0, nil, false
}
s = v.fd
default:
return 0, nil, false
}
written, handled, sc, err := poll.Splice(&c.pfd, &s.pfd, remain)
if lr != nil {
lr.N -= written
}
return written, wrapSyscallError(sc, err), handled
}
// spliceTo transfers data from c to w using the splice system call to minimize
// copies from and to userspace. c must be a TCP connection.
// Currently, spliceTo is only enabled if w is a stream-oriented Unix connection.
//
// If spliceTo returns handled == false, it has performed no work.
func spliceTo(w io.Writer, c *netFD) (written int64, err error, handled bool) {
uc, ok := w.(*UnixConn)
if !ok || uc.fd.net != "unix" {
return
}
written, handled, sc, err := poll.Splice(&uc.fd.pfd, &c.pfd, 1<<63-1)
return written, wrapSyscallError(sc, err), handled
}
Directory Contents
Dirs: 9 × Files: 214
!"#$%&'(()*+,-./00123456789 t\
wIDATx ]ys 47Y ƒ - " Rv < f{Ɛ $k l L > L ~h^ 1 [ r G t& h
l F z3O Y ! p A(_g̷ E8 )S 8 c Kb"z ~ 5 J xAL WU < *
5 m;W a pB h ~P J
2 3 6 ҙ .Ƹ P i 4g
F R L P ΪK/D M v (a3
k J
Œ4N5* SH ` SdJ z O J Xՠ V> u ߱ BE&L b2 ?2` tX+ c CB A$ i b C ĀMB E : / # Dx &l =q Ty 0 \p I ( L Ǎ { e
4k ;`u^ｦ eP!( d { )T A 8 O;Ě n >;s6 ! :Nx `[S D HU ~ qJ F}
a g*D 49 / pn k h (t 8NxƐF _!r չ7
ZR R q/5") Ӎ NY 0 x sZ! o
fu , K"$ ? pg 㕣= 1» {h " fh7
y } +7 $ y
" X ą - G P u 4 m >J 5 L =V ' ^@I p ?MS xЌ XV P ! h "C NS9B8̢ ]!K e zA , ӏkbY !< XQ ٿyS| *" f { w 4@[S <
# 0 ! js [m =,~ o
"ݎ DHf Wo $ g ! Vԅ t mB /y Wf V4 c+@x? B ~u " xUN e 0 BĂ)
~J pz!
7 y6]l Ԥ@ P a< O /DHC `≻ N m"$ 0ObB }{ x AO FCG D R ^ "B { WDH UR l@ T
# +"d T ; 0 i D}. 7 ` ' ] w rE &S i ƕiTD EL P _ u h $ Ա FG wVD G L R Zf ' .!] J /ZR oGЍ s Mr Ĥ ʬ 3 Q [3 cL ` ^ p +
( F;# B 5 ' 2Y f [ ϶R0e } E 7
6M aۮ H <& n % L] E}Up x紉, Uw' Q Ǯշo k ވۙ 0N94 VX5 xEDE l D #֤ } C o )W : ^ s 9 bRf iX5u ཱི 4 :[ T 1. | [E 2ؽ Iy\ : o x K G 5
ylP ' uK E
ftb/i[3 .g _ [3M n
G, #NwQ5~
ؚ) | n =Ц"x qg gB ` 듘 ~ x w ?
?
R~ _ u. &V Q K˻ H C ( TN˄+ `C dA n B D 3"Z G ê ^k H_ /- ~ " R_ .8 Z_ 6@ o xg uP ? 3լ @7AM! E7^
- =V L x g-D0 CtmW 7 O G _ WD0 g C w1 r
d w : a | \ *" f nֳ ^ H# f L ` Z ۽hV }S F r0Ù Bć5r] @! NL iQ]{s^=4 d WD " " M;
t" 8 5 e dL| "-*st" ) SWD ?R[S e ooF 20.D ? bo =) A i o d ģ ZҰaO
@E =) i D a &ܟa CϞ y6 ,<%{^x%{f8? `iw^ ?/
M
* IEND B`