From 0712ec69c70d5065447f7ffdbd907e3d7ae50ae9 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Thu, 28 Feb 2019 03:58:43 +0100
Subject: ipc: implement event system with pipes

Also use Go 1.12's Sysconn

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 service/ipc_pipe.go | 32 +++++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)

(limited to 'service/ipc_pipe.go')

diff --git a/service/ipc_pipe.go b/service/ipc_pipe.go
index ee63f2d4..00f54bf7 100644
--- a/service/ipc_pipe.go
+++ b/service/ipc_pipe.go
@@ -33,26 +33,44 @@ func (p *pipeRWC) Close() error {
 	return err2
 }
 
-func inheritableSocketpairEmulation() (ourReader *os.File, theirReader *os.File, theirReaderStr string, ourWriter *os.File, theirWriter *os.File, theirWriterStr string, err error) {
-	ourReader, theirWriter, err = os.Pipe()
+func makeInheritableAndGetStr(f *os.File) (str string, err error) {
+	sc, err := f.SyscallConn()
 	if err != nil {
 		return
 	}
-	err = windows.SetHandleInformation(windows.Handle(theirWriter.Fd()), windows.HANDLE_FLAG_INHERIT, windows.HANDLE_FLAG_INHERIT)
+	err2 := sc.Control(func(fd uintptr) {
+		err = windows.SetHandleInformation(windows.Handle(fd), windows.HANDLE_FLAG_INHERIT, windows.HANDLE_FLAG_INHERIT)
+		str = strconv.FormatUint(uint64(fd), 10)
+	})
+	if err2 != nil {
+		err = err2
+	}
+	return
+}
+
+func inheritableEvents() (ourEvents *os.File, theirEvents *os.File, theirEventStr string, err error) {
+	theirEvents, ourEvents, err = os.Pipe()
 	if err != nil {
 		return
 	}
-	theirWriterStr = strconv.FormatUint(uint64(theirWriter.Fd()), 10)
+	theirEventStr, err = makeInheritableAndGetStr(theirEvents)
+	return
+}
 
-	theirReader, ourWriter, err = os.Pipe()
+func inheritableSocketpairEmulation() (ourReader *os.File, theirReader *os.File, theirReaderStr string, ourWriter *os.File, theirWriter *os.File, theirWriterStr string, err error) {
+	ourReader, theirWriter, err = os.Pipe()
 	if err != nil {
 		return
 	}
-	err = windows.SetHandleInformation(windows.Handle(theirReader.Fd()), windows.HANDLE_FLAG_INHERIT, windows.HANDLE_FLAG_INHERIT)
+	theirWriterStr, err = makeInheritableAndGetStr(theirWriter)
 	if err != nil {
 		return
 	}
-	theirReaderStr = strconv.FormatUint(uint64(theirReader.Fd()), 10)
 
+	theirReader, ourWriter, err = os.Pipe()
+	if err != nil {
+		return
+	}
+	theirReaderStr, err = makeInheritableAndGetStr(theirReader)
 	return
 }
-- 
cgit v1.2.3-59-g8ed1b