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inherited.go
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/
inherited.go
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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build !windows
package pipe
import (
"os"
"os/exec"
)
// addInheritedFile add a file that will be inherited by the new process.
func addInheritedFile(cmd *exec.Cmd, file *os.File) uintptr {
// From https://pkg.go.dev/os/exec#Cmd.ExtraFiles: "entry i becomes file
// descriptor 3+i".
fd := 3 + len(cmd.ExtraFiles)
cmd.ExtraFiles = append(cmd.ExtraFiles, file)
return uintptr(fd)
}