| 1 | package persistentshell |
| 2 | |
| 3 | import ( |
| 4 | "os" |
| 5 | "os/exec" |
| 6 | "sync" |
| 7 | |
| 8 | "reasonix/internal/proc" |
| 9 | ) |
| 10 | |
| 11 | type pipeProcess struct { |
| 12 | input, output *os.File |
| 13 | cmd *exec.Cmd |
| 14 | job uintptr |
| 15 | once sync.Once |
| 16 | } |
| 17 | |
| 18 | // Both output streams share one OS pipe so command output and its trailing |
| 19 | // completion fence remain ordered. Track the whole process tree before the |
| 20 | // shell starts; cancellation must retire its children as well as the shell. |
| 21 | func startPipe(argv []string, dir string, env []string) (ptyConn, error) { |
| 22 | if len(argv) == 0 { |
| 23 | return nil, errEmptyArgv |
| 24 | } |
| 25 | inputReader, inputWriter, err := os.Pipe() |
| 26 | if err != nil { |
| 27 | return nil, err |
| 28 | } |
| 29 | outputReader, outputWriter, err := os.Pipe() |
| 30 | if err != nil { |
| 31 | _ = inputReader.Close() |
| 32 | _ = inputWriter.Close() |
| 33 | return nil, err |
| 34 | } |
| 35 | cmd := proc.Command(argv[0], argv[1:]...) |
| 36 | cmd.Dir, cmd.Env = dir, env |
| 37 | cmd.Stdin, cmd.Stdout, cmd.Stderr = inputReader, outputWriter, outputWriter |
| 38 | job, err := startShellTracked(cmd) |
| 39 | _ = inputReader.Close() |
| 40 | _ = outputWriter.Close() |
| 41 | if err != nil { |
| 42 | _ = inputWriter.Close() |
| 43 | _ = outputReader.Close() |
| 44 | return nil, err |
| 45 | } |
| 46 | return &pipeProcess{input: inputWriter, output: outputReader, cmd: cmd, job: job}, nil |
| 47 | } |
| 48 | |
| 49 | func (p *pipeProcess) Read(b []byte) (int, error) { return p.output.Read(b) } |
| 50 | func (p *pipeProcess) Write(b []byte) (int, error) { return p.input.Write(b) } |
| 51 | func (p *pipeProcess) Close() error { |
| 52 | p.once.Do(func() { |
| 53 | proc.KillTracked(p.cmd, p.job) |
| 54 | _ = p.input.Close() |
| 55 | _ = p.output.Close() |
| 56 | _ = p.cmd.Wait() |
| 57 | }) |
| 58 | return nil |
| 59 | } |
| 60 |