posixshmem module shm_rename freebsd support.

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@@ -68,6 +68,52 @@ _posixshmem_shm_open_impl(PyObject *module, PyObject *path, int flags,
 }
 #endif /* HAVE_SHM_OPEN */
 
+#ifdef HAVE_SHM_RENAME
+/*[clinic input]
+_posixshmem.shm_rename
+ path_from: unicode
+ path_to: unicode
+ flags: int
+
+Rename a shared memory object.
+
+Remove a shared memory object and relink to another path
+By default, if the destination path already exist, it will be unlinked.
+With the SHM_RENAME_EXCHANGE flag, source and destination paths
+will be exchanged.
+With the SHM_RENAME_NOREPLACE flag, an error will be triggered
+if the destination alredady exists.
+
+[clinic start generated code]*/
+
+static PyObject *
+_posixshmem_shm_rename_impl(PyObject *module, PyObject *path_from,
+ PyObject *path_to, int flags)
+/*[clinic end generated code: output=a9101f606826ad30 input=e32a44cee3e0326e]*/
+{
+ int rv;
+ int async_err = 0;
+ const char *from = PyUnicode_AsUTF8(path_from);
+ const char *to = PyUnicode_AsUTF8(path_to);
+ if (from == NULL || to == NULL) {
+ return NULL;
+ }
+ do {
+ Py_BEGIN_ALLOW_THREADS
+ rv = shm_rename(from, to, flags);
+ Py_END_ALLOW_THREADS
+ } while (rv < 0 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
+
+ if (rv < 0) {
+ if (!async_err)
+ PyErr_SetFromErrnoWithFilenameObjects(PyExc_OSError, path_from, path_to);
+ return NULL;
+ }
+
+ Py_RETURN_NONE;
+}
+#endif /* HAVE_SHM_RENAME */
+
 #ifdef HAVE_SHM_UNLINK
 /*[clinic input]
 _posixshmem.shm_unlink
@@ -111,6 +157,9 @@ _posixshmem_shm_unlink_impl(PyObject *module, PyObject *path)
 
 static PyMethodDef module_methods[ ] = {
  _POSIXSHMEM_SHM_OPEN_METHODDEF
+#if defined(HAVE_SHM_RENAME)
+ _POSIXSHMEM_SHM_RENAME_METHODDEF
+#endif
  _POSIXSHMEM_SHM_UNLINK_METHODDEF
  {NULL} /* Sentinel */
 };

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@@ -17288,6 +17288,16 @@ all_ins(PyObject *m)
 #endif
 #endif /* HAVE_MEMFD_CREATE */
 
+#ifdef HAVE_SHM_RENAME
+#ifdef SHM_RENAME_EXCHANGE
+ if (PyModule_AddIntMacro(m, SHM_RENAME_EXCHANGE)) return -1;
+#endif
+#ifdef SHM_RENAME_NOREPLACE
+ if (PyModule_AddIntMacro(m, SHM_RENAME_NOREPLACE)) return -1;
+#endif
+#endif /* HAVE_SHM_RENAME */
+
+#ifdef HAVE_EVENTFD
 #if defined(HAVE_EVENTFD) && defined(EFD_CLOEXEC)
  if (PyModule_AddIntMacro(m, EFD_CLOEXEC)) return -1;
 #ifdef EFD_NONBLOCK

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@@ -6873,7 +6873,7 @@ WITH_SAVE_ENV([
  # endif
  #endif
  "
- AC_CHECK_FUNCS([shm_open shm_unlink], [have_posix_shmem=yes], [have_posix_shmem=no])
+ AC_CHECK_FUNCS([shm_open shm_rename shm_unlink], [have_posix_shmem=yes], [have_posix_shmem=no])
  _RESTORE_VAR([ac_includes_default])
 ])
 

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@@ -1138,6 +1138,9 @@
 /* Define to 1 if you have the `shm_open' function. */
 #undef HAVE_SHM_OPEN
 
+/* Define to 1 if you have the `shm_rename' function. */
+#undef HAVE_SHM_RENAME
+
 /* Define to 1 if you have the `shm_unlink' function. */
 #undef HAVE_SHM_UNLINK