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import io
import os
import re
import sys
from ._core import Process
# FreeBSD: https://www.freebsd.org/cgi/man.cgi?query=procfs
# NetBSD: https://man.netbsd.org/NetBSD-9.3-STABLE/mount_procfs.8
# DragonFlyBSD: https://www.dragonflybsd.org/cgi/web-man?command=procfs
BSD_STAT_PPID = 2
# See https://docs.kernel.org/filesystems/proc.html
LINUX_STAT_PPID = 3
STAT_PATTERN = re.compile(r"\(.+\)|\S+")
def detect_proc():
"""Detect /proc filesystem style.
This checks the /proc/{pid} directory for possible formats. Returns one of
the following as str:
* `stat`: Linux-style, i.e. ``/proc/{pid}/stat``.
* `status`: BSD-style, i.e. ``/proc/{pid}/status``.
"""
pid = os.getpid()
for name in ("stat", "status"):
if os.path.exists(os.path.join("/proc", str(pid), name)):
return name
raise ProcFormatError("unsupported proc format")
def _use_bsd_stat_format():
try:
return os.uname().sysname.lower() in ("freebsd", "netbsd", "dragonfly")
except Exception:
return False
def _get_ppid(pid, name):
path = os.path.join("/proc", str(pid), name)
with io.open(path, encoding="ascii", errors="replace") as f:
parts = STAT_PATTERN.findall(f.read())
# We only care about TTY and PPID -- both are numbers.
if _use_bsd_stat_format():
return parts[BSD_STAT_PPID]
return parts[LINUX_STAT_PPID]
def _get_cmdline(pid):
path = os.path.join("/proc", str(pid), "cmdline")
encoding = sys.getfilesystemencoding() or "utf-8"
with io.open(path, encoding=encoding, errors="replace") as f:
# XXX: Command line arguments can be arbitrary byte sequences, not
# necessarily decodable. For Shellingham's purpose, however, we don't
# care. (pypa/pipenv#2820)
# cmdline appends an extra NULL at the end, hence the [:-1].
return tuple(f.read().split("\0")[:-1])
class ProcFormatError(EnvironmentError):
pass
def iter_process_parents(pid, max_depth=10):
"""Try to look up the process tree via the /proc interface."""
stat_name = detect_proc()
# Inner generator function so we correctly throw an error eagerly if proc
# is not supported, rather than on the first call to the iterator. This
# allows the call site detects the correct implementation.
def _iter_process_parents(pid, max_depth):
for _ in range(max_depth):
ppid = _get_ppid(pid, stat_name)
args = _get_cmdline(pid)
yield Process(args=args, pid=pid, ppid=ppid)
if ppid == "0":
break
pid = ppid
return _iter_process_parents(pid, max_depth)