From 155e21cc7f37ade106171ac53fd6826869811001 Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <bradfitz@golang.org>
Date: Thu, 6 Oct 2011 11:00:02 -0700
Subject: exec: add Command.ExtraFiles

Allows passing extra fds to the child process.

Fixes #2329

R=rsc, dsymonds
CC=golang-dev
https://golang.org/cl/5162050
---
 src/pkg/exec/exec.go | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/pkg/exec/exec.go')

diff --git a/src/pkg/exec/exec.go b/src/pkg/exec/exec.go
index 3b20f2008c..aaad50846e 100644
--- a/src/pkg/exec/exec.go
+++ b/src/pkg/exec/exec.go
@@ -63,6 +63,11 @@ type Cmd struct {
 	Stdout io.Writer
 	Stderr io.Writer
 
+	// ExtraFiles specifies additional open files to be inherited by the
+	// new process. It does not include standard input, standard output, or
+	// standard error. If non-nil, entry i becomes file descriptor 3+i.
+	ExtraFiles []*os.File
+
 	// SysProcAttr holds optional, operating system-specific attributes.
 	// Run passes it to os.StartProcess as the os.ProcAttr's Sys field.
 	SysProcAttr *syscall.SysProcAttr
@@ -224,6 +229,7 @@ func (c *Cmd) Start() os.Error {
 		}
 		c.childFiles = append(c.childFiles, fd)
 	}
+	c.childFiles = append(c.childFiles, c.ExtraFiles...)
 
 	var err os.Error
 	c.Process, err = os.StartProcess(c.Path, c.argv(), &os.ProcAttr{
-- 
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