mirror of
https://gcc.gnu.org/git/gcc.git
synced 2024-11-23 10:54:07 +08:00
4f4a855d82
Reviewed-on: https://go-review.googlesource.com/c/158019 gotools/: * Makefile.am (go_cmd_vet_files): Update for Go1.12beta2 release. (GOTOOLS_TEST_TIMEOUT): Increase to 600. (check-runtime): Export LD_LIBRARY_PATH before computing GOARCH and GOOS. (check-vet): Copy golang.org/x/tools into check-vet-dir. * Makefile.in: Regenerate. gcc/testsuite/: * go.go-torture/execute/names-1.go: Stop using debug/xcoff, which is no longer externally visible. From-SVN: r268084
45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
// 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"
|
|
)
|
|
|
|
// 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 << 62 // 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
|
|
if tc, ok := r.(*TCPConn); ok {
|
|
s = tc.fd
|
|
} else if uc, ok := r.(*UnixConn); ok {
|
|
if uc.fd.net != "unix" {
|
|
return 0, nil, false
|
|
}
|
|
s = uc.fd
|
|
} else {
|
|
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
|
|
}
|