libgo: update to go1.9

    
    Reviewed-on: https://go-review.googlesource.com/63753

From-SVN: r252767

1 files changed, 34 insertions, 0 deletions

diff --git a/libgo/go/os/pipe_freebsd.go b/libgo/go/os/pipe_freebsd.go
new file mode 100644
index 0000000..ea6622c
--- /dev/null
+++ b/libgo/go/os/pipe_freebsd.go
@@ -0,0 +1,34 @@
+// Copyright 2017 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 os
+
+import "syscall"
+
+// Pipe returns a connected pair of Files; reads from r return bytes written to w.
+// It returns the files and an error, if any.
+func Pipe() (r *File, w *File, err error) {
+	var p [2]int
+
+	e := syscall.Pipe2(p[0:], syscall.O_CLOEXEC)
+	if e != nil {
+		// Fallback support for FreeBSD 9, which lacks Pipe2.
+		//
+		// TODO: remove this for Go 1.10 when FreeBSD 9
+		// is removed (Issue 19072).
+
+		// See ../syscall/exec.go for description of lock.
+		syscall.ForkLock.RLock()
+		e := syscall.Pipe(p[0:])
+		if e != nil {
+			syscall.ForkLock.RUnlock()
+			return nil, nil, NewSyscallError("pipe", e)
+		}
+		syscall.CloseOnExec(p[0])
+		syscall.CloseOnExec(p[1])
+		syscall.ForkLock.RUnlock()
+	}
+
+	return newFile(uintptr(p[0]), "|0", true), newFile(uintptr(p[1]), "|1", true), nil
+}