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// Copyright 2015 The Vanadium 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 exec
// ExecVersionVariable is the name of the environment variable used by the exec
// package to communicate the protocol version between the parent and child. It
// takes care to clear this variable from the child process' environment as soon
// as it can, however, there may still be some situations where an application
// may need to test for its presence or ensure that it doesn't appear in a set
// of environment variables; exposing the name of this variable is intended to
// support such situations.
const ExecVersionVariable = "V23_EXEC_VERSION"
const (
version1 = "1.0.0"
readyStatus = "ready::"
failedStatus = "failed::"
initStatus = "init"
// eofChar is written onto the status pipe to signal end-of-file. It
// should be the last byte written onto the pipe, before closing it.
// This signals to the reader that no more input is coming. This is
// needed since we cannot use the closing of the write end of the pipe
// to send io.EOF to the reader: since there are two write ends (one in
// the parent and one in the child), closing any one of the two is not
// going to send io.EOF to the reader.
// Since the data coming from the child should be valid utf-8, we pick
// one of the invalid utf-8 bytes for this.
eofChar = 0xFF