Simplify conv_confname

Author: mhsmith

Lib/test/support/os_helper.py

@@ -632,8 +632,7 @@ def fd_count():
     if hasattr(os, 'sysconf'):
         try:
             MAXFD = os.sysconf("SC_OPEN_MAX")
-        except (OSError, ValueError):
-            # gh-118201: ValueError is raised intermittently on iOS
+        except OSError:
             pass
 
     old_modes = None

Lib/test/test_os.py

@@ -2447,8 +2447,8 @@ def test_fchown(self):
         support.is_emscripten or support.is_wasi,
         "musl libc issue on Emscripten/WASI, bpo-46390"
     )
-    @unittest.skipIf(support.is_apple_mobile, "gh-118201: Test is flaky on iOS")
     def test_fpathconf(self):
+        self.assertIn("PC_NAME_MAX", os.pathconf_names)
         self.check(os.pathconf, "PC_NAME_MAX")
         self.check(os.fpathconf, "PC_NAME_MAX")
         self.check_bool(os.pathconf, "PC_NAME_MAX")

Lib/test/test_posix.py

@@ -566,10 +566,38 @@ def test_dup(self):
 
     @unittest.skipUnless(hasattr(posix, 'confstr'),
                          'test needs posix.confstr()')
-    @unittest.skipIf(support.is_apple_mobile, "gh-118201: Test is flaky on iOS")
     def test_confstr(self):
-        self.assertRaises(ValueError, posix.confstr, "CS_garbage")
-        self.assertEqual(len(posix.confstr("CS_PATH")) > 0, True)
+        with self.assertRaisesRegex(
+            ValueError, "unrecognized configuration name"
+        ):
+            posix.confstr("CS_garbage")
+
+        with self.assertRaisesRegex(
+            TypeError, "configuration names must be strings or integers"
+        ):
+            posix.confstr(1.23)
+
+        path = posix.confstr("CS_PATH")
+        self.assertGreater(len(path), 0)
+        self.assertEqual(posix.confstr(posix.confstr_names["CS_PATH"]), path)
+
+    @unittest.skipUnless(hasattr(posix, 'sysconf'),
+                         'test needs posix.sysconf()')
+    def test_sysconf(self):
+        with self.assertRaisesRegex(
+            ValueError, "unrecognized configuration name"
+        ):
+            posix.sysconf("SC_garbage")
+
+        with self.assertRaisesRegex(
+            TypeError, "configuration names must be strings or integers"
+        ):
+            posix.sysconf(1.23)
+
+        open_max = posix.sysconf("SC_OPEN_MAX")
+        self.assertGreater(open_max, 0)
+        self.assertEqual(
+            posix.sysconf(posix.sysconf_names["SC_OPEN_MAX"]), open_max)
 
     @unittest.skipUnless(hasattr(posix, 'dup2'),
                          'test needs posix.dup2()')

Misc/NEWS.d/next/Library/2024-10-28-19-49-18.gh-issue-118201.v41XXh.rst

@@ -0,0 +1,2 @@
+Fixed intermittent failures of :any:`os.confstr`, :any:`os.pathconf` and
+:any:`os.sysconf` on iOS and Android.

Modules/clinic/posixmodule.c.h

@@ -13535,46 +13535,33 @@ struct constdef {
 };
 
 static int
-conv_confname(PyObject *arg, int *valuep, struct constdef *table,
-              size_t tablesize)
-{
-    if (PyLong_Check(arg)) {
-        int value = PyLong_AsInt(arg);
-        if (value == -1 && PyErr_Occurred())
-            return 0;
-        *valuep = value;
-        return 1;
-    }
-    else {
-        /* look up the value in the table using a binary search */
-        size_t lo = 0;
-        size_t mid;
-        size_t hi = tablesize;
-        int cmp;
-        const char *confname;
-        if (!PyUnicode_Check(arg)) {
-            PyErr_SetString(PyExc_TypeError,
-                "configuration names must be strings or integers");
-            return 0;
-        }
-        confname = PyUnicode_AsUTF8(arg);
-        if (confname == NULL)
-            return 0;
-        while (lo < hi) {
-            mid = (lo + hi) / 2;
-            cmp = strcmp(confname, table[mid].name);
-            if (cmp < 0)
-                hi = mid;
-            else if (cmp > 0)
-                lo = mid + 1;
-            else {
-                *valuep = table[mid].value;
-                return 1;
+conv_confname(PyObject *module, PyObject *arg, int *valuep, const char *tablename)
+{
+    if (PyUnicode_Check(arg)) {
+        PyObject *table = PyObject_GetAttrString(module, tablename);
+        if (table != NULL) {
+            arg = PyObject_GetItem(table, arg);
+            if (arg == NULL) {
+                PyErr_SetString(
+                    PyExc_ValueError, "unrecognized configuration name");
             }
+            Py_DECREF(table);
         }
-        PyErr_SetString(PyExc_ValueError, "unrecognized configuration name");
-        return 0;
+        if (PyErr_Occurred())
+            return 0;
+    } else {
+        Py_INCREF(arg);
+    }
+
+    if (PyLong_Check(arg)) {
+        *valuep = PyLong_AsInt(arg);
+    } else {
+        PyErr_SetString(PyExc_TypeError,
+            "configuration names must be strings or integers");
     }
+
+    Py_DECREF(arg);
+    return !PyErr_Occurred();
 }
 
 
@@ -13665,14 +13652,6 @@ static struct constdef  posix_constants_pathconf[] = {
     {"PC_TIMESTAMP_RESOLUTION", _PC_TIMESTAMP_RESOLUTION},
 #endif
 };
-
-static int
-conv_path_confname(PyObject *arg, int *valuep)
-{
-    return conv_confname(arg, valuep, posix_constants_pathconf,
-                         sizeof(posix_constants_pathconf)
-                           / sizeof(struct constdef));
-}
 #endif
 
 
@@ -13897,14 +13876,6 @@ static struct constdef posix_constants_confstr[] = {
 #endif
 };
 
-static int
-conv_confstr_confname(PyObject *arg, int *valuep)
-{
-    return conv_confname(arg, valuep, posix_constants_confstr,
-                         sizeof(posix_constants_confstr)
-                           / sizeof(struct constdef));
-}
-
 
 /*[clinic input]
 os.confstr
@@ -14454,14 +14425,6 @@ static struct constdef posix_constants_sysconf[] = {
 #endif
 };
 
-static int
-conv_sysconf_confname(PyObject *arg, int *valuep)
-{
-    return conv_confname(arg, valuep, posix_constants_sysconf,
-                         sizeof(posix_constants_sysconf)
-                           / sizeof(struct constdef));
-}
-
 
 /*[clinic input]
 os.sysconf -> long
@@ -14486,40 +14449,15 @@ os_sysconf_impl(PyObject *module, int name)
 #endif /* HAVE_SYSCONF */
 
 
-/* This code is used to ensure that the tables of configuration value names
- * are in sorted order as required by conv_confname(), and also to build
- * the exported dictionaries that are used to publish information about the
- * names available on the host platform.
- *
- * Sorting the table at runtime ensures that the table is properly ordered
- * when used, even for platforms we're not able to test on.  It also makes
- * it easier to add additional entries to the tables.
- */
-
-static int
-cmp_constdefs(const void *v1,  const void *v2)
-{
-    const struct constdef *c1 =
-    (const struct constdef *) v1;
-    const struct constdef *c2 =
-    (const struct constdef *) v2;
-
-    return strcmp(c1->name, c2->name);
-}
-
 static int
 setup_confname_table(struct constdef *table, size_t tablesize,
                      const char *tablename, PyObject *module)
 {
-    PyObject *d = NULL;
-    size_t i;
-
-    qsort(table, tablesize, sizeof(struct constdef), cmp_constdefs);
-    d = PyDict_New();
+    PyObject *d = PyDict_New();
     if (d == NULL)
         return -1;
 
-    for (i=0; i < tablesize; ++i) {
+    for (size_t i=0; i < tablesize; ++i) {
         PyObject *o = PyLong_FromLong(table[i].value);
         if (o == NULL || PyDict_SetItemString(d, table[i].name, o) == -1) {
             Py_XDECREF(o);