Issue #19734: ctypes resource management fixes

Lib/ctypes/util.py

@@ -132,7 +132,9 @@ elif os.name == "posix":
             cmd = 'if ! type objdump >/dev/null 2>&1; then exit 10; fi;' \
                   "objdump -p -j .dynamic 2>/dev/null " + f
             f = os.popen(cmd)
+            try:
                 dump = f.read()
+            finally:
                 rv = f.close()
             if rv == 10:
                 raise OSError('objdump command not found')
@@ -176,7 +178,8 @@ elif os.name == "posix":
             else:
                 cmd = 'env LC_ALL=C /usr/bin/crle 2>/dev/null'
 
-            for line in os.popen(cmd).readlines():
+            with contextlib.closing(os.popen(cmd)) as f:
+                for line in f.readlines():
                     line = line.strip()
                     if line.startswith('Default Library Path (ELF):'):
                         paths = line.split()[4]