feat: add persistent PTY sessions
This commit is contained in:
NI0317
@@ -0,0 +1,215 @@
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import { describe, expect, it } from 'vitest'
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import { createProcessInspector, parseProcStat } from '@deepseek-ai/dsh-pty-local/src/process-inspector.ts'
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import type { ProcessInspectorInternals } from '@deepseek-ai/dsh-pty-local/src/process-inspector.ts'
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function stat(pid: number, pgrp: number, session: number, tpgid: number, started: string, parentPid = 1): string {
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const rest = ['S', String(parentPid), String(pgrp), String(session), '99', String(tpgid)]
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while (rest.length < 19) rest.push('0')
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rest.push(started)
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return `${pid} (command with space) ${rest.join(' ')}`
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}
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function syscall(number: number, ...args: number[]): string {
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const six = [...args]
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while (six.length < 6) six.push(0)
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return `${number} ${six.slice(0, 6).map(value => `0x${value.toString(16)}`).join(' ')}`
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}
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function fakeInternals() {
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const files = new Map<string, string>()
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const dirs = new Map<string, string[]>()
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const memories = new Map<string, Buffer>()
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const fds = new Map<number, string>()
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const kills: Array<[number, NodeJS.Signals]> = []
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let nextFd = 10
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let ps = ''
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let tpgid = '0'
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const internals: ProcessInspectorInternals = {
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readFile(path) {
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const value = files.get(path)
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if (value === undefined) throw new Error(`missing ${path}`)
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return value
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},
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readDir(path) {
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const value = dirs.get(path)
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if (value === undefined) throw new Error(`missing ${path}`)
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return value
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},
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open(path) {
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if (!memories.has(path)) throw new Error(`missing ${path}`)
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const fd = nextFd++
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fds.set(fd, path)
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return fd
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},
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read(fd, buffer, length, position) {
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const path = fds.get(fd)
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if (path === undefined) throw new Error('bad fd')
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const source = memories.get(path)
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if (source === undefined) throw new Error('missing memory')
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return source.copy(buffer, 0, position, Math.min(source.length, position + length))
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},
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close(fd) { fds.delete(fd) },
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exec(_file, args) {
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if (args.includes('tpgid=')) return tpgid
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return ps
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},
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kill(pid, signal) { kills.push([pid, signal]) },
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}
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return {
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internals, files, dirs, memories, kills,
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setPs(value: string) { ps = value },
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setTpgid(value: string) { tpgid = value },
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}
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}
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describe('Linux process inspector', () => {
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it('parses stat safely, captures only the rooted process tree, and signals identities', () => {
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expect(parseProcStat('bad')).toBeUndefined()
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expect(parseProcStat('1 () S')).toBeUndefined()
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expect(parseProcStat(stat(10, 20, 30, 40, '500'))).toEqual({ pid: 10, parentPid: 1, pgrp: 20, session: 30, tpgid: 40, started: '500' })
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const fake = fakeInternals()
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fake.dirs.set('/proc', ['x', '10', '11', '12', '13', '14'])
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fake.files.set('/proc/10/stat', stat(10, 20, 30, 40, '500'))
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fake.files.set('/proc/11/stat', stat(11, 21, 30, -1, '501'))
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fake.files.set('/proc/12/stat', stat(12, 22, 30, -1, '502', 10))
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fake.files.set('/proc/13/stat', stat(13, 23, 30, -1, '503', 12))
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const inspector = createProcessInspector('linux', 'x64', fake.internals)
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expect(inspector.foregroundPgid(10)).toBe(40)
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expect(inspector.foregroundPgid(11)).toBeUndefined()
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expect(inspector.foregroundPgid(99)).toBeUndefined()
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expect(inspector.processTree(10)).toEqual([
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{ pid: 13, started: '503' },
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{ pid: 12, started: '502' },
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{ pid: 10, started: '500' },
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])
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expect(inspector.processTree(99)).toEqual([])
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expect(inspector.isAlive({ pid: 10, started: '500' })).toBe(true)
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expect(inspector.isAlive({ pid: 10, started: 'old' })).toBe(false)
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inspector.signalGroup(40, 'SIGINT')
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inspector.signalProcess({ pid: 10, started: '500' }, 'SIGTERM')
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inspector.signalProcess({ pid: 10, started: 'old' }, 'SIGKILL')
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expect(fake.kills).toEqual([[-40, 'SIGINT'], [10, 'SIGTERM']])
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})
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it('detects read, select, poll, and epoll waits across non-leader threads', () => {
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const fake = fakeInternals()
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fake.dirs.set('/proc', ['100', '101'])
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fake.files.set('/proc/100/stat', stat(100, 77, 100, 77, '1'))
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fake.files.set('/proc/101/stat', stat(101, 77, 100, 77, '2'))
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fake.dirs.set('/proc/100/task', ['100'])
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fake.dirs.set('/proc/101/task', ['101', '102'])
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const inspector = createProcessInspector('linux', 'x64', fake.internals)
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fake.files.set('/proc/100/task/100/syscall', 'running')
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fake.files.set('/proc/101/task/101/syscall', '-1 0x0')
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fake.files.set('/proc/101/task/102/syscall', syscall(0, 0))
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expect(inspector.isStdinWaiting(77)).toBe(true)
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fake.files.set('/proc/101/task/102/syscall', syscall(270, 1, 0x10))
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const fdSet = Buffer.alloc(0x11)
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fdSet[0x10] = 1
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fake.memories.set('/proc/101/mem', fdSet)
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expect(inspector.isStdinWaiting(77)).toBe(true)
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const poll = Buffer.alloc(8)
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poll.writeInt32LE(0, 0)
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poll.writeInt16LE(1, 4)
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fake.files.set('/proc/101/task/102/syscall', syscall(7, 0x20, 1))
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fake.memories.set('/proc/101/mem', Buffer.concat([Buffer.alloc(0x20), poll]))
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expect(inspector.isStdinWaiting(77)).toBe(true)
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fake.files.set('/proc/101/task/102/syscall', syscall(232, 5, 0, 1))
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fake.files.set('/proc/101/fdinfo/5', 'pos: 0\ntfd: 0 events: 19\n')
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expect(inspector.isStdinWaiting(77)).toBe(true)
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})
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it('fails closed on unsupported, malformed, unreadable, or non-stdin waits', () => {
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const fake = fakeInternals()
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fake.dirs.set('/proc', ['100'])
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fake.files.set('/proc/100/stat', stat(100, 77, 100, 77, '1'))
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fake.dirs.set('/proc/100/task', ['100'])
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fake.files.set('/proc/100/task/100/syscall', syscall(0, 2))
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expect(createProcessInspector('linux', 'mips', fake.internals).isStdinWaiting(77)).toBe(false)
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expect(createProcessInspector('linux', 'x64', fake.internals).isStdinWaiting(77)).toBe(false)
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fake.files.set('/proc/100/task/100/syscall', syscall(270, 1, 0))
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expect(createProcessInspector('linux', 'x64', fake.internals).isStdinWaiting(77)).toBe(false)
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fake.files.set('/proc/100/task/100/syscall', syscall(7, 0, 0))
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expect(createProcessInspector('linux', 'x64', fake.internals).isStdinWaiting(77)).toBe(false)
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fake.files.set('/proc/100/task/100/syscall', syscall(7, 0, 1))
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expect(createProcessInspector('linux', 'x64', fake.internals).isStdinWaiting(77)).toBe(false)
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fake.files.set('/proc/100/task/100/syscall', syscall(7, 0x20, 1))
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expect(createProcessInspector('linux', 'x64', fake.internals).isStdinWaiting(77)).toBe(false)
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fake.files.set('/proc/100/task/100/syscall', syscall(232, 9, 0, 1))
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expect(createProcessInspector('linux', 'x64', fake.internals).isStdinWaiting(77)).toBe(false)
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fake.files.set('/proc/100/task/100/syscall', syscall(999))
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expect(createProcessInspector('linux', 'x64', fake.internals).isStdinWaiting(77)).toBe(false)
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fake.files.set('/proc/100/task/100/syscall', 'not-a-number 0x0')
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expect(createProcessInspector('linux', 'x64', fake.internals).isStdinWaiting(77)).toBe(false)
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fake.dirs.delete('/proc/100/task')
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expect(createProcessInspector('linux', 'x64', fake.internals).isStdinWaiting(77)).toBe(false)
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fake.dirs.set('/proc', ['100', '200'])
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fake.files.set('/proc/200/stat', stat(200, 88, 200, 88, '2'))
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expect(createProcessInspector('linux', 'x64', fake.internals).isStdinWaiting(77)).toBe(false)
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})
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it('contains unreadable syscall, memory, and fdinfo boundaries', () => {
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const fake = fakeInternals()
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fake.dirs.set('/proc', ['100'])
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fake.files.set('/proc/100/stat', stat(100, 77, 100, 77, '1'))
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fake.dirs.set('/proc/100/task', ['100'])
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const inspector = createProcessInspector('linux', 'x64', fake.internals)
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expect(inspector.isStdinWaiting(77)).toBe(false)
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fake.files.set('/proc/100/task/100/syscall', syscall(270, 1, 0x10))
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expect(inspector.isStdinWaiting(77)).toBe(false)
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fake.files.set('/proc/100/task/100/syscall', syscall(232, 5, 0, 1))
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expect(inspector.isStdinWaiting(77)).toBe(false)
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const noStdinPoll = Buffer.alloc(0x28)
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noStdinPoll.writeInt32LE(2, 0x20)
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noStdinPoll.writeInt16LE(1, 0x24)
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fake.memories.set('/proc/100/mem', noStdinPoll)
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fake.files.set('/proc/100/task/100/syscall', syscall(7, 0x20, 1))
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expect(inspector.isStdinWaiting(77)).toBe(false)
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})
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})
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describe('macOS process inspector', () => {
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it('reads tpgid and process trees, contains cycles, and identity-fences signals', () => {
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const fake = fakeInternals()
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fake.setTpgid('55\n')
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fake.setPs(' 10 1 Mon Jul 21 10:00:00 2026\n 11 10 Mon Jul 21 10:00:01 2026\n 12 11 Mon Jul 21 10:00:02 2026\n 13 99 Mon Jul 21 10:00:03 2026\nmalformed\n')
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const inspector = createProcessInspector('darwin', 'arm64', fake.internals)
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expect(inspector.foregroundPgid(10)).toBe(55)
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expect(inspector.isStdinWaiting(55)).toBe(false)
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expect(inspector.processTree(10)).toEqual([
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{ pid: 12, started: 'Mon Jul 21 10:00:02 2026' },
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{ pid: 11, started: 'Mon Jul 21 10:00:01 2026' },
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{ pid: 10, started: 'Mon Jul 21 10:00:00 2026' },
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])
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expect(inspector.processTree(99)).toEqual([])
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expect(inspector.isAlive({ pid: 11, started: 'Mon Jul 21 10:00:01 2026' })).toBe(true)
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inspector.signalGroup(55, 'SIGTSTP')
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inspector.signalProcess({ pid: 11, started: 'Mon Jul 21 10:00:01 2026' }, 'SIGKILL')
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inspector.signalProcess({ pid: 12, started: 'missing' }, 'SIGTERM')
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expect(fake.kills).toEqual([[-55, 'SIGTSTP'], [11, 'SIGKILL']])
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fake.setPs(' 10 11 Mon Jul 21 10:00:00 2026\n 11 10 Mon Jul 21 10:00:01 2026\n')
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expect(inspector.processTree(10)).toEqual([
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{ pid: 11, started: 'Mon Jul 21 10:00:01 2026' },
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{ pid: 10, started: 'Mon Jul 21 10:00:00 2026' },
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])
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})
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it('returns undefined for missing or invalid foreground groups and rejects unsupported platforms', () => {
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const fake = fakeInternals()
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fake.setTpgid('-1')
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expect(createProcessInspector('darwin', 'arm64', fake.internals).foregroundPgid(1)).toBeUndefined()
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fake.internals.exec = () => { throw new Error('gone') }
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expect(createProcessInspector('darwin', 'arm64', fake.internals).foregroundPgid(1)).toBeUndefined()
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expect(() => createProcessInspector('win32', 'x64', fake.internals)).toThrow('unsupported platform win32')
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})
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})
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