gh-108277: Add os.timerfd_create() function (#108382)

Add wrapper for timerfd_create, timerfd_settime, and timerfd_gettime to os module.

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>
Co-authored-by: Victor Stinner <vstinner@python.org>

Include/internal/pycore_global_objects_fini_generated.h

@@ -993,6 +993,7 @@ _PyStaticObjects_CheckRefcnt(PyInterpreterState *interp) {
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(instructions));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(intern));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(intersection));
+    _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(interval));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(is_running));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(isatty));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(isinstance));

Include/internal/pycore_global_strings.h

@@ -482,6 +482,7 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(instructions)
         STRUCT_FOR_ID(intern)
         STRUCT_FOR_ID(intersection)
+        STRUCT_FOR_ID(interval)
         STRUCT_FOR_ID(is_running)
         STRUCT_FOR_ID(isatty)
         STRUCT_FOR_ID(isinstance)

Include/internal/pycore_runtime_init_generated.h

@@ -991,6 +991,7 @@ extern "C" {
     INIT_ID(instructions), \
     INIT_ID(intern), \
     INIT_ID(intersection), \
+    INIT_ID(interval), \
     INIT_ID(is_running), \
     INIT_ID(isatty), \
     INIT_ID(isinstance), \

Include/internal/pycore_time.h

@@ -143,6 +143,10 @@ PyAPI_FUNC(int) _PyTime_ObjectToTimespec(
 // Export for '_socket' shared extension.
 PyAPI_FUNC(_PyTime_t) _PyTime_FromSeconds(int seconds);
 
+// Create a timestamp from a number of seconds in double.
+// Export for '_socket' shared extension.
+PyAPI_FUNC(_PyTime_t) _PyTime_FromSecondsDouble(double seconds, _PyTime_round_t round);
+
 // Macro to create a timestamp from a number of seconds, no integer overflow.
 // Only use the macro for small values, prefer _PyTime_FromSeconds().
 #define _PYTIME_FROMSECONDS(seconds) \
@@ -241,7 +245,7 @@ PyAPI_FUNC(int) _PyTime_AsTimevalTime_t(
 #if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_KQUEUE)
 // Create a timestamp from a timespec structure.
 // Raise an exception and return -1 on overflow, return 0 on success.
-extern int _PyTime_FromTimespec(_PyTime_t *tp, struct timespec *ts);
+extern int _PyTime_FromTimespec(_PyTime_t *tp, const struct timespec *ts);
 
 // Convert a timestamp to a timespec structure (nanosecond resolution).
 // tv_nsec is always positive.

Include/internal/pycore_unicodeobject_generated.h

@@ -1287,6 +1287,9 @@ _PyUnicode_InitStaticStrings(PyInterpreterState *interp) {
     string = &_Py_ID(intersection);
     assert(_PyUnicode_CheckConsistency(string, 1));
     _PyUnicode_InternInPlace(interp, &string);
+    string = &_Py_ID(interval);
+    assert(_PyUnicode_CheckConsistency(string, 1));
+    _PyUnicode_InternInPlace(interp, &string);
     string = &_Py_ID(is_running);
     assert(_PyUnicode_CheckConsistency(string, 1));
     _PyUnicode_InternInPlace(interp, &string);