def spawn(process_name, cmdline, env, redirect_output):
log.info(
"Spawning debuggee process:\n\n"
"Command line: {0!r}\n\n"
"Environment variables: {1!r}\n\n",
cmdline,
env,
)
close_fds = set()
try:
if redirect_output:
# subprocess.PIPE behavior can vary substantially depending on Python version
# and platform; using our own pipes keeps it simple, predictable, and fast.
stdout_r, stdout_w = os.pipe()
stderr_r, stderr_w = os.pipe()
close_fds |= {stdout_r, stdout_w, stderr_r, stderr_w}
kwargs = dict(stdout=stdout_w, stderr=stderr_w)
else:
kwargs = {}
try:
global process
process = subprocess.Popen(cmdline, env=env, bufsize=0, **kwargs)
except Exception as exc:
raise messaging.MessageHandlingError(
fmt("Couldn't spawn debuggee: {0}\n\nCommand line:{1!r}", exc, cmdline)
)
log.info("Spawned {0}.", describe())
atexit.register(kill)
launcher.channel.send_event(
"process",
{
"startMethod": "launch",
"isLocalProcess": True,
"systemProcessId": process.pid,
"name": process_name,
"pointerSize": struct.calcsize(compat.force_str("P")) * 8,
},
)
if redirect_output:
for category, fd, tee in [
("stdout", stdout_r, sys.stdout),
("stderr", stderr_r, sys.stderr),
]:
output.CaptureOutput(describe(), category, fd, tee)
close_fds.remove(fd)
wait_thread = threading.Thread(target=wait_for_exit, name="wait_for_exit()")
wait_thread.daemon = True
wait_thread.start()
finally:
for fd in close_fds:
try:
os.close(fd)
except Exception:
log.swallow_exception()
def spawn(process_name, cmdline, env, redirect_output):
log.info(
"Spawning debuggee process:\n\n"
"Command line: {0!r}\n\n"
"Environment variables: {1!r}\n\n",
cmdline,
env,
)
close_fds = set()
try:
if redirect_output:
# subprocess.PIPE behavior can vary substantially depending on Python version
# and platform; using our own pipes keeps it simple, predictable, and fast.
stdout_r, stdout_w = os.pipe()
stderr_r, stderr_w = os.pipe()
close_fds |= {stdout_r, stdout_w, stderr_r, stderr_w}
kwargs = dict(stdout=stdout_w, stderr=stderr_w)
else:
kwargs = {}
if sys.platform != "win32":
def preexec_fn():
try:
# Start the debuggee in a new process group, so that the launcher can
# kill the entire process tree later.
os.setpgrp()
# Make the new process group the foreground group in its session, so
# that it can interact with the terminal. The debuggee will receive
# SIGTTOU when tcsetpgrp() is called, and must ignore it.
old_handler = signal.signal(signal.SIGTTOU, signal.SIG_IGN)
try:
tty = os.open("/dev/tty", os.O_RDWR)
try:
os.tcsetpgrp(tty, os.getpgrp())
finally:
os.close(tty)
finally:
signal.signal(signal.SIGTTOU, old_handler)
except Exception:
# Not an error - /dev/tty doesn't work when there's no terminal.
log.swallow_exception(
"Failed to set up process group", level="info"
)
kwargs.update(preexec_fn=preexec_fn)
try:
global process
process = subprocess.Popen(cmdline, env=env, bufsize=0, **kwargs)
except Exception as exc:
raise messaging.MessageHandlingError(
fmt("Couldn't spawn debuggee: {0}\n\nCommand line:{1!r}", exc, cmdline)
)
log.info("Spawned {0}.", describe())
if sys.platform == "win32":
# Assign the debuggee to a new job object, so that the launcher can kill
# the entire process tree later.
try:
global job_handle
job_handle = winapi.kernel32.CreateJobObjectA(None, None)
job_info = winapi.JOBOBJECT_EXTENDED_LIMIT_INFORMATION()
job_info_size = winapi.DWORD(ctypes.sizeof(job_info))
winapi.kernel32.QueryInformationJobObject(
job_handle,
winapi.JobObjectExtendedLimitInformation,
ctypes.pointer(job_info),
job_info_size,
ctypes.pointer(job_info_size),
)
# Setting this flag ensures that the job will be terminated by the OS once the
# launcher exits, even if it doesn't terminate the job explicitly.
job_info.BasicLimitInformation.LimitFlags |= (
winapi.JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE
)
winapi.kernel32.SetInformationJobObject(
job_handle,
winapi.JobObjectExtendedLimitInformation,
ctypes.pointer(job_info),
job_info_size,
)
process_handle = winapi.kernel32.OpenProcess(
winapi.PROCESS_TERMINATE | winapi.PROCESS_SET_QUOTA,
False,
process.pid,
)
winapi.kernel32.AssignProcessToJobObject(job_handle, process_handle)
except Exception:
log.swallow_exception("Failed to set up job object", level="warning")
atexit.register(kill)
launcher.channel.send_event(
"process",
{
"startMethod": "launch",
"isLocalProcess": True,
"systemProcessId": process.pid,
"name": process_name,
"pointerSize": struct.calcsize(compat.force_str("P")) * 8,
},
)
if redirect_output:
for category, fd, tee in [
("stdout", stdout_r, sys.stdout),
("stderr", stderr_r, sys.stderr),
]:
output.CaptureOutput(describe(), category, fd, tee)
close_fds.remove(fd)
wait_thread = threading.Thread(target=wait_for_exit, name="wait_for_exit()")
wait_thread.daemon = True
wait_thread.start()
finally:
for fd in close_fds:
try:
os.close(fd)
except Exception:
log.swallow_exception(level="warning")