Revert "gh-137044: Make resource.RLIM_INFINITY always positive (GH-137511)"

This reverts commit 0324c72.

Author: encukou

Doc/library/resource.rst

@@ -50,11 +50,6 @@ this module for those platforms.
 .. data:: RLIM_INFINITY
 
    Constant used to represent the limit for an unlimited resource.
-   Its value is larger than any limited resource value.
-
-   .. versionchanged:: next
-      It is now always positive.
-      Previously, it could be negative, such as -1 or -3.
 
 
 .. data:: RLIM_SAVED_CUR

Doc/whatsnew/3.15.rst

@@ -604,12 +604,6 @@ Porting to Python 3.15
   The |pythoncapi_compat_project| can be used to get most of these new
   functions on Python 3.14 and older.
 
-* :data:`resource.RLIM_INFINITY` is now always positive.
-  Passing a negative integer value that corresponded to its old value
-  (such as ``-1`` or ``-3``, depending on platform) to
-  :func:`resource.setrlimit` and :func:`resource.prlimit` is now deprecated.
-  (Contributed by Serhiy Storchaka in :gh:`137044`.)
-
 
 Deprecated C APIs
 -----------------

Lib/test/test_resource.py

@@ -40,10 +40,7 @@ def test_fsize_ismax(self):
         # we need to test that the get/setrlimit functions properly convert
         # the number to a C long long and that the conversion doesn't raise
         # an error.
-        self.assertGreater(resource.RLIM_INFINITY, 0)
         self.assertEqual(resource.RLIM_INFINITY, max)
-        self.assertLessEqual(cur, max)
-        resource.setrlimit(resource.RLIMIT_FSIZE, (max, max))
         resource.setrlimit(resource.RLIMIT_FSIZE, (cur, max))
 
     @unittest.skipIf(sys.platform == "vxworks",
@@ -116,53 +113,56 @@ def test_fsize_not_too_big(self):
         self.addCleanup(resource.setrlimit, resource.RLIMIT_FSIZE, (cur, max))
 
         def expected(cur):
-            return (min(cur, resource.RLIM_INFINITY), max)
+            if resource.RLIM_INFINITY < 0:
+                return [(cur, max), (resource.RLIM_INFINITY, max)]
+            elif resource.RLIM_INFINITY < cur:
+                return [(resource.RLIM_INFINITY, max)]
+            else:
+                return [(cur, max)]
 
         resource.setrlimit(resource.RLIMIT_FSIZE, (2**31-5, max))
         self.assertEqual(resource.getrlimit(resource.RLIMIT_FSIZE), (2**31-5, max))
-        resource.setrlimit(resource.RLIMIT_FSIZE, (2**31, max))
-        self.assertEqual(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**31))
-        resource.setrlimit(resource.RLIMIT_FSIZE, (2**32-5, max))
-        self.assertEqual(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**32-5))
 
         try:
             resource.setrlimit(resource.RLIMIT_FSIZE, (2**32, max))
         except OverflowError:
-            pass
+            resource.setrlimit(resource.RLIMIT_FSIZE, (2**31, max))
+            self.assertIn(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**31))
+            resource.setrlimit(resource.RLIMIT_FSIZE, (2**32-5, max))
+            self.assertIn(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**32-5))
         else:
-            self.assertEqual(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**32))
+            self.assertIn(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**32))
+            resource.setrlimit(resource.RLIMIT_FSIZE, (2**31, max))
+            self.assertEqual(resource.getrlimit(resource.RLIMIT_FSIZE), (2**31, max))
+            resource.setrlimit(resource.RLIMIT_FSIZE, (2**32-5, max))
+            self.assertEqual(resource.getrlimit(resource.RLIMIT_FSIZE), (2**32-5, max))
 
             resource.setrlimit(resource.RLIMIT_FSIZE, (2**63-5, max))
-            self.assertEqual(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**63-5))
+            self.assertIn(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**63-5))
             try:
                 resource.setrlimit(resource.RLIMIT_FSIZE, (2**63, max))
             except ValueError:
                 # There is a hard limit on macOS.
                 pass
             else:
-                self.assertEqual(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**63))
+                self.assertIn(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**63))
                 resource.setrlimit(resource.RLIMIT_FSIZE, (2**64-5, max))
-                self.assertEqual(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**64-5))
+                self.assertIn(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**64-5))
 
     @unittest.skipIf(sys.platform == "vxworks",
                      "setting RLIMIT_FSIZE is not supported on VxWorks")
     @unittest.skipUnless(hasattr(resource, 'RLIMIT_FSIZE'), 'requires resource.RLIMIT_FSIZE')
     def test_fsize_negative(self):
-        self.assertGreater(resource.RLIM_INFINITY, 0)
         (cur, max) = resource.getrlimit(resource.RLIMIT_FSIZE)
         for value in -5, -2**31, -2**32-5, -2**63, -2**64-5, -2**1000:
             with self.subTest(value=value):
+                # This test assumes that the values don't map to RLIM_INFINITY,
+                # though Posix doesn't guarantee it.
+                self.assertNotEqual(value, resource.RLIM_INFINITY)
+
                 self.assertRaises(ValueError, resource.setrlimit, resource.RLIMIT_FSIZE, (value, max))
                 self.assertRaises(ValueError, resource.setrlimit, resource.RLIMIT_FSIZE, (cur, value))
 
-        if resource.RLIM_INFINITY in (2**32-3, 2**32-1, 2**64-3, 2**64-1):
-            value = (resource.RLIM_INFINITY & 0xffff) - 0x10000
-            with self.assertWarnsRegex(DeprecationWarning, "RLIM_INFINITY"):
-                resource.setrlimit(resource.RLIMIT_FSIZE, (value, max))
-            with self.assertWarnsRegex(DeprecationWarning, "RLIM_INFINITY"):
-                resource.setrlimit(resource.RLIMIT_FSIZE, (cur, value))
-
-
     @unittest.skipUnless(hasattr(resource, "getrusage"), "needs getrusage")
     def test_getrusage(self):
         self.assertRaises(TypeError, resource.getrusage)

Misc/NEWS.d/next/Library/2025-08-07-12-32-23.gh-issue-137044.abNoIy.rst

@@ -164,14 +164,7 @@ py2rlim(PyObject *obj, rlim_t *out)
     if (bytes < 0) {
         return -1;
     }
-    else if (neg && *out == RLIM_INFINITY && bytes <= (Py_ssize_t)sizeof(*out)) {
-        if (PyErr_WarnEx(PyExc_DeprecationWarning,
-            "Use RLIM_INFINITY instead of negative limit value.", 1))
-        {
-            return -1;
-        }
-    }
-    else if (neg) {
+    else if (neg && (*out != RLIM_INFINITY || bytes > (Py_ssize_t)sizeof(*out))) {
         PyErr_SetString(PyExc_ValueError,
             "Cannot convert negative int");
         return -1;
@@ -217,6 +210,9 @@ py2rlimit(PyObject *limits, struct rlimit *rl_out)
 static PyObject*
 rlim2py(rlim_t value)
 {
+    if (value == RLIM_INFINITY) {
+        return PyLong_FromNativeBytes(&value, sizeof(value), -1);
+    }
     return PyLong_FromUnsignedNativeBytes(&value, sizeof(value), -1);
 }