♻️ refactor(av1-transfer): replace setproctitle with ctypes to fully hide cmdline args

Drop the setproctitle dependency. Use prctl(PR_SET_NAME) to change
/proc/self/comm and directly overwrite argv memory via Py_GetArgcArgv
to clear /proc/self/cmdline, so ps aux shows no arguments.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

av1-transfer/main.py

@@ -17,13 +17,15 @@ AV1 视频批量转码脚本
 """
 
 import argparse
+import ctypes
+import ctypes.util
 import queue
 import shutil
 import subprocess
+import sys
 from concurrent.futures import ThreadPoolExecutor, as_completed
 from pathlib import Path
 
-import setproctitle
 from tqdm import tqdm
 
 # ================= 配置区域 =================
@@ -35,6 +37,42 @@ VIDEO_EXTS = {".mp4", ".mkv", ".mov", ".avi", ".flv", ".ts", ".webm"}
 SLOT_BAR_FORMAT = "{desc:<50} {percentage:3.0f}%|{bar}| {n:.0f}/{total:.0f}s"
 
 
+def _set_proc_title(title: str) -> None:
+    """
+    通过两种方式彻底隐藏进程命令行：
+    1. prctl(PR_SET_NAME) — 改 /proc/self/comm（top 默认显示的短名）
+    2. 直接覆盖 argv 内存 — 改 /proc/self/cmdline（ps aux COMMAND 列）
+    """
+    # 1. 改短名（/proc/self/comm，最多 15 字节）
+    try:
+        libc_name = ctypes.util.find_library("c")
+        if libc_name:
+            libc = ctypes.CDLL(libc_name, use_errno=True)
+            libc.prctl(15, title.encode()[:15], 0, 0, 0)  # PR_SET_NAME = 15
+    except Exception:
+        pass
+
+    # 2. 覆盖 argv 内存，清除 /proc/self/cmdline 里的参数
+    try:
+        argc = ctypes.c_int(0)
+        argv = ctypes.POINTER(ctypes.c_char_p)()
+        ctypes.pythonapi.Py_GetArgcArgv(ctypes.byref(argc), ctypes.byref(argv))
+        if argc.value == 0:
+            return
+        # argv 字符串在内存中连续排列，计算总占用字节数
+        start = ctypes.cast(argv[0], ctypes.c_void_p).value
+        end = ctypes.cast(argv[argc.value - 1], ctypes.c_void_p).value
+        end += len(argv[argc.value - 1]) + 1
+        size = end - start
+        # 用 title 填充开头，其余全部清零
+        enc = title.encode()[:size - 1]
+        buf = (ctypes.c_char * size).from_address(start)
+        buf[:len(enc)] = enc
+        buf[len(enc):] = b"\x00" * (size - len(enc))
+    except Exception:
+        pass
+
+
 def get_duration(input_path):
     """用 ffprobe 获取视频时长（秒），失败返回 None"""
     result = subprocess.run(
@@ -203,7 +241,7 @@ def main():
 
     print(f"共发现 {len(tasks)} 个文件，准备使用 {max_workers} 个并行任务进行转码...")
     if process_name:
-        setproctitle.setproctitle(process_name)
+        _set_proc_title(process_name)
         print(f"进程别名: {process_name}")
 
     # 初始化进度条