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250 lines
8.4 KiB
Python
250 lines
8.4 KiB
Python
# Copyright (c) Microsoft Corporation. All rights reserved.
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# Licensed under the MIT License. See LICENSE in the project root
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# for license information.
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import atexit
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import ctypes
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import os
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import signal
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import struct
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import subprocess
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import sys
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import threading
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from debugpy import launcher
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from debugpy.common import log, messaging
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from debugpy.launcher import output
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if sys.platform == "win32":
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from debugpy.launcher import winapi
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process = None
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"""subprocess.Popen instance for the debuggee process."""
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job_handle = None
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"""On Windows, the handle for the job object to which the debuggee is assigned."""
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wait_on_exit_predicates = []
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"""List of functions that determine whether to pause after debuggee process exits.
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Every function is invoked with exit code as the argument. If any of the functions
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returns True, the launcher pauses and waits for user input before exiting.
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"""
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def describe():
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return f"Debuggee[PID={process.pid}]"
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def spawn(process_name, cmdline, env, redirect_output):
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log.info(
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"Spawning debuggee process:\n\n"
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"Command line: {0!r}\n\n"
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"Environment variables: {1!r}\n\n",
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cmdline,
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env,
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)
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close_fds = set()
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try:
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if redirect_output:
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# subprocess.PIPE behavior can vary substantially depending on Python version
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# and platform; using our own pipes keeps it simple, predictable, and fast.
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stdout_r, stdout_w = os.pipe()
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stderr_r, stderr_w = os.pipe()
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close_fds |= {stdout_r, stdout_w, stderr_r, stderr_w}
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kwargs = dict(stdout=stdout_w, stderr=stderr_w)
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else:
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kwargs = {}
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if sys.platform != "win32":
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def preexec_fn():
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try:
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# Start the debuggee in a new process group, so that the launcher can
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# kill the entire process tree later.
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os.setpgrp()
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# Make the new process group the foreground group in its session, so
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# that it can interact with the terminal. The debuggee will receive
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# SIGTTOU when tcsetpgrp() is called, and must ignore it.
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old_handler = signal.signal(signal.SIGTTOU, signal.SIG_IGN)
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try:
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tty = os.open("/dev/tty", os.O_RDWR)
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try:
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os.tcsetpgrp(tty, os.getpgrp())
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finally:
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os.close(tty)
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finally:
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signal.signal(signal.SIGTTOU, old_handler)
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except Exception:
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# Not an error - /dev/tty doesn't work when there's no terminal.
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log.swallow_exception(
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"Failed to set up process group", level="info"
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)
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kwargs.update(preexec_fn=preexec_fn)
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try:
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global process
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process = subprocess.Popen(cmdline, env=env, bufsize=0, **kwargs)
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except Exception as exc:
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raise messaging.MessageHandlingError(
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"Couldn't spawn debuggee: {0}\n\nCommand line:{1!r}".format(
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exc, cmdline
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)
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)
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log.info("Spawned {0}.", describe())
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if sys.platform == "win32":
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# Assign the debuggee to a new job object, so that the launcher can kill
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# the entire process tree later.
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try:
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global job_handle
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job_handle = winapi.kernel32.CreateJobObjectA(None, None)
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job_info = winapi.JOBOBJECT_EXTENDED_LIMIT_INFORMATION()
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job_info_size = winapi.DWORD(ctypes.sizeof(job_info))
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winapi.kernel32.QueryInformationJobObject(
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job_handle,
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winapi.JobObjectExtendedLimitInformation,
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ctypes.pointer(job_info),
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job_info_size,
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ctypes.pointer(job_info_size),
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)
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job_info.BasicLimitInformation.LimitFlags |= (
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# Ensure that the job will be terminated by the OS once the
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# launcher exits, even if it doesn't terminate the job explicitly.
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winapi.JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE
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# Allow the debuggee to create its own jobs unrelated to ours.
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winapi.JOB_OBJECT_LIMIT_BREAKAWAY_OK
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)
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winapi.kernel32.SetInformationJobObject(
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job_handle,
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winapi.JobObjectExtendedLimitInformation,
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ctypes.pointer(job_info),
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job_info_size,
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)
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process_handle = winapi.kernel32.OpenProcess(
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winapi.PROCESS_TERMINATE | winapi.PROCESS_SET_QUOTA,
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False,
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process.pid,
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)
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winapi.kernel32.AssignProcessToJobObject(job_handle, process_handle)
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except Exception:
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log.swallow_exception("Failed to set up job object", level="warning")
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atexit.register(kill)
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launcher.channel.send_event(
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"process",
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{
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"startMethod": "launch",
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"isLocalProcess": True,
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"systemProcessId": process.pid,
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"name": process_name,
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"pointerSize": struct.calcsize("P") * 8,
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},
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)
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if redirect_output:
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for category, fd, tee in [
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("stdout", stdout_r, sys.stdout),
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("stderr", stderr_r, sys.stderr),
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]:
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output.CaptureOutput(describe(), category, fd, tee)
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close_fds.remove(fd)
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wait_thread = threading.Thread(target=wait_for_exit, name="wait_for_exit()")
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wait_thread.daemon = True
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wait_thread.start()
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finally:
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for fd in close_fds:
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try:
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os.close(fd)
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except Exception:
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log.swallow_exception(level="warning")
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def kill():
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if process is None:
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return
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try:
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if process.poll() is None:
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log.info("Killing {0}", describe())
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# Clean up the process tree
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if sys.platform == "win32":
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# On Windows, kill the job object.
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winapi.kernel32.TerminateJobObject(job_handle, 0)
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else:
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# On POSIX, kill the debuggee's process group.
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os.killpg(process.pid, signal.SIGKILL)
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except Exception:
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log.swallow_exception("Failed to kill {0}", describe())
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def wait_for_exit():
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try:
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code = process.wait()
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if sys.platform != "win32" and code < 0:
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# On POSIX, if the process was terminated by a signal, Popen will use
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# a negative returncode to indicate that - but the actual exit code of
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# the process is always an unsigned number, and can be determined by
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# taking the lowest 8 bits of that negative returncode.
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code &= 0xFF
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except Exception:
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log.swallow_exception("Couldn't determine process exit code")
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code = -1
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log.info("{0} exited with code {1}", describe(), code)
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output.wait_for_remaining_output()
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# Determine whether we should wait or not before sending "exited", so that any
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# follow-up "terminate" requests don't affect the predicates.
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should_wait = any(pred(code) for pred in wait_on_exit_predicates)
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try:
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launcher.channel.send_event("exited", {"exitCode": code})
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except Exception:
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pass
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if should_wait:
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_wait_for_user_input()
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try:
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launcher.channel.send_event("terminated")
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except Exception:
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pass
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def _wait_for_user_input():
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if sys.stdout and sys.stdin and sys.stdin.isatty():
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from debugpy.common import log
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try:
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import msvcrt
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except ImportError:
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can_getch = False
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else:
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can_getch = True
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if can_getch:
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log.debug("msvcrt available - waiting for user input via getch()")
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sys.stdout.write("Press any key to continue . . . ")
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sys.stdout.flush()
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msvcrt.getch()
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else:
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log.debug("msvcrt not available - waiting for user input via read()")
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sys.stdout.write("Press Enter to continue . . . ")
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sys.stdout.flush()
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sys.stdin.read(1)
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