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from dataclasses import dataclass
import os
from pathlib import Path
import pwd
import time
from typing import Mapping
from .models import ProcessSample
from .sanitize import render_argv, sanitize_argv
CLK_TCK = os.sysconf(os.sysconf_names.get("SC_CLK_TCK", "SC_CLK_TCK"))
PAGE_SIZE = os.sysconf(os.sysconf_names.get("SC_PAGE_SIZE", "SC_PAGE_SIZE"))
@dataclass(frozen=True)
class StatFields:
pid: int
comm: str
state: str
ppid: int
pgid: int
sid: int
tty_nr: int
utime_ticks: int
stime_ticks: int
priority: int
nice: int
num_threads: int
start_time_ticks: int
vms_bytes: int
rss_pages: int
def parse_stat(stat_text: str) -> StatFields:
open_idx = stat_text.find("(")
close_idx = stat_text.rfind(")")
if open_idx < 0 or close_idx < open_idx:
raise ValueError("invalid stat comm field")
pid = int(stat_text[:open_idx].strip())
comm = stat_text[open_idx + 1 : close_idx]
rest = stat_text[close_idx + 2 :].split()
if len(rest) < 22:
raise ValueError("stat line is missing fields")
return StatFields(
pid=pid,
comm=comm,
state=rest[0],
ppid=int(rest[1]),
pgid=int(rest[2]),
sid=int(rest[3]),
tty_nr=int(rest[4]),
utime_ticks=int(rest[11]),
stime_ticks=int(rest[12]),
priority=int(rest[15]),
nice=int(rest[16]),
num_threads=int(rest[17]),
start_time_ticks=int(rest[19]),
vms_bytes=int(rest[20]),
rss_pages=int(rest[21]),
)
def read_boot_id(proc_root: Path = Path("/proc")) -> str:
try:
return (proc_root / "sys/kernel/random/boot_id").read_text().strip()
except OSError:
return "unknown-boot"
def read_uptime(proc_root: Path = Path("/proc")) -> float:
try:
return float((proc_root / "uptime").read_text().split()[0])
except (OSError, ValueError, IndexError):
return time.monotonic()
def _read_status(path: Path) -> tuple[int, str, int, tuple[str, ...]]:
uid = -1
user = ""
threads = 0
errors: list[str] = []
try:
for line in path.read_text(errors="replace").splitlines():
if line.startswith("Uid:"):
parts = line.split()
uid = int(parts[1])
try:
user = pwd.getpwuid(uid).pw_name
except KeyError:
user = str(uid)
elif line.startswith("Threads:"):
threads = int(line.split()[1])
except (OSError, ValueError, IndexError) as exc:
errors.append(f"status:{type(exc).__name__}")
return uid, user, threads, tuple(errors)
def _read_cmdline(path: Path, comm: str) -> tuple[tuple[str, ...], str, int, tuple[str, ...]]:
errors: list[str] = []
try:
raw = path.read_bytes()
except OSError as exc:
raw = b""
errors.append(f"cmdline:{type(exc).__name__}")
argv_raw = [part.decode("utf-8", "replace") for part in raw.split(b"\0") if part]
if not argv_raw and comm:
argv_raw = [comm]
argv, masked_count = sanitize_argv(argv_raw)
return argv, render_argv(argv), masked_count, tuple(errors)
def _read_statm(path: Path) -> tuple[int, int, tuple[str, ...]]:
try:
fields = path.read_text().split()
vms_pages = int(fields[0])
rss_pages = int(fields[1])
return rss_pages * PAGE_SIZE, vms_pages * PAGE_SIZE, ()
except (OSError, ValueError, IndexError) as exc:
return 0, 0, (f"statm:{type(exc).__name__}",)
def _read_text(path: Path, label: str) -> tuple[str, tuple[str, ...]]:
try:
return path.read_text(errors="replace").strip(), ()
except OSError as exc:
return "", (f"{label}:{type(exc).__name__}",)
def _read_link(path: Path, label: str) -> tuple[str, tuple[str, ...]]:
try:
return os.readlink(path), ()
except OSError as exc:
return "", (f"{label}:{type(exc).__name__}",)
def _sample_pid(
pid_dir: Path,
*,
boot_id: str,
uptime_seconds: float,
sample_ts: float,
previous: Mapping[str, ProcessSample],
current_uid_only: bool,
exclude_pids: set[int],
) -> ProcessSample | None:
try:
pid = int(pid_dir.name)
except ValueError:
return None
if pid in exclude_pids:
return None
errors: list[str] = []
try:
stat_fields = parse_stat((pid_dir / "stat").read_text())
except (OSError, ValueError):
return None
uid, user, threads, status_errors = _read_status(pid_dir / "status")
errors.extend(status_errors)
if current_uid_only and uid != -1 and uid != os.getuid():
return None
process_key = f"{boot_id}:{stat_fields.pid}:{stat_fields.start_time_ticks}:{uid}"
argv, argv_display, masked_count, cmd_errors = _read_cmdline(
pid_dir / "cmdline", stat_fields.comm
)
errors.extend(cmd_errors)
rss_bytes, vms_bytes, statm_errors = _read_statm(pid_dir / "statm")
errors.extend(statm_errors)
if not rss_bytes:
rss_bytes = max(0, stat_fields.rss_pages) * PAGE_SIZE
if not vms_bytes:
vms_bytes = stat_fields.vms_bytes
cgroup, cgroup_errors = _read_text(pid_dir / "cgroup", "cgroup")
errors.extend(cgroup_errors)
exe_path, exe_errors = _read_link(pid_dir / "exe", "exe")
cwd, cwd_errors = _read_link(pid_dir / "cwd", "cwd")
errors.extend(exe_errors)
errors.extend(cwd_errors)
age = max(0.0, uptime_seconds - (stat_fields.start_time_ticks / CLK_TCK))
cpu_percent = 0.0
previous_sample = previous.get(process_key)
if previous_sample is not None:
wall_delta = sample_ts - previous_sample.sample_ts
ticks_delta = (
stat_fields.utime_ticks
+ stat_fields.stime_ticks
- previous_sample.cpu_ticks
)
if wall_delta > 0 and ticks_delta >= 0:
cpu_percent = 100.0 * (ticks_delta / CLK_TCK) / wall_delta
return ProcessSample(
sample_ts=sample_ts,
boot_id=boot_id,
pid=stat_fields.pid,
ppid=stat_fields.ppid,
pgid=stat_fields.pgid,
sid=stat_fields.sid,
uid=uid,
user=user or str(uid),
comm=stat_fields.comm,
state=stat_fields.state,
start_time_ticks=stat_fields.start_time_ticks,
process_key=process_key,
age_seconds=age,
rss_bytes=rss_bytes,
vms_bytes=vms_bytes,
utime_ticks=stat_fields.utime_ticks,
stime_ticks=stat_fields.stime_ticks,
cpu_percent_interval=cpu_percent,
num_threads=threads or stat_fields.num_threads,
argv=argv,
argv_display=argv_display,
argv_masked_count=masked_count,
exe_path=exe_path,
cwd=cwd,
cgroup=cgroup,
read_errors=tuple(errors),
)
def scan_processes(
proc_root: str | Path = "/proc",
*,
previous: Mapping[str, ProcessSample] | None = None,
current_uid_only: bool = True,
exclude_pids: set[int] | None = None,
sample_ts: float | None = None,
) -> list[ProcessSample]:
root = Path(proc_root)
previous = previous or {}
exclude_pids = exclude_pids or set()
sample_ts = time.time() if sample_ts is None else sample_ts
boot_id = read_boot_id(root)
uptime_seconds = read_uptime(root)
samples: list[ProcessSample] = []
try:
pid_dirs = list(root.iterdir())
except OSError:
return samples
for pid_dir in pid_dirs:
if not pid_dir.name.isdigit():
continue
sample = _sample_pid(
pid_dir,
boot_id=boot_id,
uptime_seconds=uptime_seconds,
sample_ts=sample_ts,
previous=previous,
current_uid_only=current_uid_only,
exclude_pids=exclude_pids,
)
if sample is not None:
samples.append(sample)
samples.sort(key=lambda sample: sample.pid)
return samples
def sample_process(
pid: int,
proc_root: str | Path = "/proc",
*,
previous: Mapping[str, ProcessSample] | None = None,
current_uid_only: bool = True,
exclude_pids: set[int] | None = None,
sample_ts: float | None = None,
) -> ProcessSample | None:
root = Path(proc_root)
previous = previous or {}
exclude_pids = exclude_pids or set()
sample_ts = time.time() if sample_ts is None else sample_ts
return _sample_pid(
root / str(pid),
boot_id=read_boot_id(root),
uptime_seconds=read_uptime(root),
sample_ts=sample_ts,
previous=previous,
current_uid_only=current_uid_only,
exclude_pids=exclude_pids,
)
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