Merge pull request #1376 from gevent/issue1372

libev-cffi: Use nlink_t and let the compiler fill in the definition.

CHANGES.rst

@@ -44,6 +44,10 @@
 - Avoid unbounded memory usage when creating very deep spawn trees.
   Reported in :issue:`1371` by dmrlawson.
 
+- libev-cffi: Let the compiler fill in the definition of ``nlink_t`` for
+  ``st_nlink`` in ``struct stat``, instead of trying to guess it
+  ourself. Reported in :issue:`1372` by Andreas Schwab.
+
 1.4.0 (2019-01-04)
 ==================
 

setup.py

@@ -187,6 +187,7 @@ if not WIN:
     # Python API functions, and you're not supposed to do that from
     # CFFI code. Plus I could never get the libraries= line to ffi.compile()
     # correct to make linking work.
+    # Also, we use the type `nlink_t`, which is not defined on Windows.
     cffi_modules.append(
         LIBEV_CFFI_MODULE
     )

src/gevent/libev/_corecffi_build.py

@@ -10,21 +10,9 @@ from __future__ import absolute_import, print_function
 import sys
 import os
 import os.path # pylint:disable=no-name-in-module
-import struct
 
-__all__ = []
-
-
-def system_bits():
-    return struct.calcsize('P') * 8
 
-
-def st_nlink_type():
-    if sys.platform == "darwin" or sys.platform.startswith("freebsd"):
-        return "short"
-    if system_bits() == 32:
-        return "unsigned long"
-    return "long long"
+__all__ = []
 
 
 from cffi import FFI
@@ -38,11 +26,15 @@ def read_source(name):
 _cdef = read_source('_corecffi_cdef.c')
 _source = read_source('_corecffi_source.c')
 
-_cdef = _cdef.replace('#define GEVENT_ST_NLINK_T int', '')
+# These defines and uses help keep the C file readable and lintable by
+# C tools.
 _cdef = _cdef.replace('#define GEVENT_STRUCT_DONE int', '')
-_cdef = _cdef.replace('GEVENT_ST_NLINK_T', st_nlink_type())
 _cdef = _cdef.replace("GEVENT_STRUCT_DONE _;", '...;')
 
+_cdef = _cdef.replace('#define GEVENT_ST_NLINK_T int',
+                      'typedef int... nlink_t;')
+_cdef = _cdef.replace('GEVENT_ST_NLINK_T', 'nlink_t')
+
 
 if sys.platform.startswith('win'):
     # We must have the vfd_open, etc, functions on

src/gevent/libev/_corecffi_source.c

@@ -45,7 +45,7 @@ static void _gevent_generic_callback(struct ev_loop* loop,
         default:
             fprintf(stderr,
                     "WARNING: gevent: Unexpected return value %d from Python callback "
-                    "for watcher %p and handle %d\n",
+                    "for watcher %p and handle %p\n",
                     cb_result,
                     watcher, handle);
             // XXX: Possible leaking of resources here? Should we be

src/gevent/libuv/_corecffi_build.py

 # pylint: disable=no-member
 
-# This module is only used to create and compile the gevent._corecffi module;
+# This module is only used to create and compile the gevent.libuv._corecffi module;
 # nothing should be directly imported from it except `ffi`, which should only be
 # used for `ffi.compile()`; programs should import gevent._corecfffi.
 # However, because we are using "out-of-line" mode, it is necessary to examine
@@ -10,23 +10,12 @@ from __future__ import absolute_import, print_function
 import sys
 import os
 import os.path # pylint:disable=no-name-in-module
-import struct
+
 
 __all__ = []
 
 WIN = sys.platform.startswith('win32')
 
-def system_bits():
-    return struct.calcsize('P') * 8
-
-
-def st_nlink_type():
-    if sys.platform == "darwin" or sys.platform.startswith("freebsd"):
-        return "short"
-    if system_bits() == 32:
-        return "unsigned long"
-    return "long long"
-
 
 from cffi import FFI
 ffi = FFI()
@@ -39,12 +28,18 @@ def read_source(name):
 _cdef = read_source('_corecffi_cdef.c')
 _source = read_source('_corecffi_source.c')
 
-_cdef = _cdef.replace('#define GEVENT_ST_NLINK_T int', '')
+# These defines and uses help keep the C file readable and lintable by
+# C tools.
 _cdef = _cdef.replace('#define GEVENT_STRUCT_DONE int', '')
-_cdef = _cdef.replace('#define GEVENT_UV_OS_SOCK_T int', '')
-
-_cdef = _cdef.replace('GEVENT_ST_NLINK_T', st_nlink_type())
 _cdef = _cdef.replace("GEVENT_STRUCT_DONE _;", '...;')
+
+# nlink_t is not used in libuv.
+_cdef = _cdef.replace('#define GEVENT_ST_NLINK_T int',
+                      '')
+_cdef = _cdef.replace('GEVENT_ST_NLINK_T', 'nlink_t')
+
+
+_cdef = _cdef.replace('#define GEVENT_UV_OS_SOCK_T int', '')
 # uv_os_sock_t is int on POSIX and SOCKET on Win32, but socket is
 # just another name for handle, which is just another name for 'void*'
 # which we will treat as an 'unsigned long' or 'unsigned long long'

src/gevent/testing/testrunner.py

@@ -353,7 +353,10 @@ def print_list(lst):
         log(' - %s', name)
 
 def _setup_environ(debug=False):
-    if 'PYTHONWARNINGS' not in os.environ and not sys.warnoptions:
+    if ('PYTHONWARNINGS' not in os.environ
+            and (not sys.warnoptions
+                 # Python 3.7 goes from [] to ['default'] for nothing
+                 or sys.warnoptions == ['default'])):
 
         # action:message:category:module:line
         os.environ['PYTHONWARNINGS'] = ','.join([
@@ -373,6 +376,10 @@ def _setup_environ(debug=False):
             'ignore:::importlib._bootstrap_external:',
             # importing ABCs from collections, not collections.abc
             'ignore:::pkg_resources._vendor.pyparsing:',
+            'ignore:::dns.namedict:',
+            # dns.hash itself is being deprecated, importing it raises the warning;
+            # we don't import it, but dnspython still does
+            'ignore:::dns.hash:',
         ])
 
     if 'PYTHONFAULTHANDLER' not in os.environ: