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import errno
import subprocess
import sys
from ._core import Process
class PsNotAvailable(EnvironmentError):
pass
def iter_process_parents(pid, max_depth=10):
"""Try to look up the process tree via the output of `ps`."""
try:
cmd = ["ps", "-ww", "-o", "pid=", "-o", "ppid=", "-o", "args="]
output = subprocess.check_output(cmd)
except OSError as e: # Python 2-compatible FileNotFoundError.
if e.errno != errno.ENOENT:
raise
raise PsNotAvailable("ps not found")
except subprocess.CalledProcessError as e:
# `ps` can return 1 if the process list is completely empty.
# (sarugaku/shellingham#15)
if not e.output.strip():
return
raise
if not isinstance(output, str):
encoding = sys.getfilesystemencoding() or sys.getdefaultencoding()
output = output.decode(encoding)
processes_mapping = {}
for line in output.split("\n"):
try:
_pid, ppid, args = line.strip().split(None, 2)
# XXX: This is not right, but we are really out of options.
# ps does not offer a sane way to decode the argument display,
# and this is "Good Enough" for obtaining shell names. Hopefully
# people don't name their shell with a space, or have something
# like "/usr/bin/xonsh is uber". (sarugaku/shellingham#14)
args = tuple(a.strip() for a in args.split(" "))
except ValueError:
continue
processes_mapping[_pid] = Process(args=args, pid=_pid, ppid=ppid)
for _ in range(max_depth):
try:
process = processes_mapping[pid]
except KeyError:
return
yield process
pid = process.ppid