Fight against zombies

runall.py

@@ -1,26 +1,31 @@
 from itertools import product
-import subprocess
+import signal
+from subprocess import DEVNULL, PIPE, Popen, TimeoutExpired
 
 chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~ '
 
+# Prevent zombie processes
+signal.signal(signal.SIGCHLD, signal.SIG_IGN)
+
 
 def check_pair(script, instr, outstr):
+    process = Popen(
+        ["/usr/bin/env", "bash", "-c", "--", script],
+        stdin=PIPE,
+        stdout=PIPE,
+        stderr=DEVNULL,
+    )
+
     try:
-        result = subprocess.run(
+        stdout, stderr = process.communicate(instr.encode(), timeout=5)
-            [
+        return process.returncode == 0 and stdout == outstr.encode()
-                "/usr/bin/env", "bash", "-c",
+    except TimeoutExpired:
-                ";\n".join((
+        try:
-                    # Cleanup child processes on exit
+            process.kill()
-                    "trap 'kill -9 $(jobs -p)' SIGINT SIGTERM EXIT",
+            stdout, stderr = process.communicate()
-                    script,
+        except ProcessLookupError:
-                ))
+            pass
-            ],
+
-            timeout=5,
-            input=instr.encode(),
-            capture_output=True,
-        )
-        return result.returncode == 0 and result.stdout == outstr.encode()
-    except subprocess.TimeoutExpired:
         return False