https://github.com/python/cpython/commit/c575172425fa792845dd686a1b2f114982accd23
commit: c575172425fa792845dd686a1b2f114982accd23
branch: main
author: Victor Stinner <[email protected]>
committer: vstinner <[email protected]>
date: 2026-05-15T15:55:34Z
summary:
gh-149879: Fix sys.orig_argv[0] on Cygwin: add ".exe" suffix (#149885)
files:
M Python/initconfig.c
diff --git a/Python/initconfig.c b/Python/initconfig.c
index a996fb117aab9d..e0bdadf491bad3 100644
--- a/Python/initconfig.c
+++ b/Python/initconfig.c
@@ -3688,6 +3688,44 @@ PyConfig_SetWideStringList(PyConfig *config,
PyWideStringList *list,
}
+#ifdef __CYGWIN__
+// Cygwin strips ".exe" suffix from argv[0].
+// Add again the ".exe" suffix.
+static PyStatus
+config_argv0_add_exe(PyConfig *config)
+{
+ if (config->argv.length < 1) {
+ return _PyStatus_OK();
+ }
+ const wchar_t *argv0 = config->argv.items[0];
+ size_t len = wcslen(argv0);
+ if (len >= 5 && wcscmp(argv0 + len - 4, L".exe") == 0) {
+ return _PyStatus_OK();
+ }
+
+ wchar_t *exe = PyMem_RawMalloc((len + 4 + 1) * sizeof(wchar_t));
+ if (exe == NULL) {
+ return _PyStatus_NO_MEMORY();
+ }
+ wcscpy(exe, argv0);
+ wcscat(exe, L".exe");
+
+ FILE *fp = _Py_wfopen(exe, L"rb");
+ if (fp != NULL) {
+ fclose(fp);
+
+ PyMem_RawFree(config->argv.items[0]);
+ config->argv.items[0] = exe;
+ }
+ else {
+ PyMem_RawFree(exe);
+ }
+
+ return _PyStatus_OK();
+}
+#endif
+
+
/* Read the configuration into PyConfig from:
* Command line arguments
@@ -3707,6 +3745,13 @@ _PyConfig_Read(PyConfig *config, int compute_path_config)
config_get_global_vars(config);
+#ifdef __CYGWIN__
+ status = config_argv0_add_exe(config);
+ if (_PyStatus_EXCEPTION(status)) {
+ return status;
+ }
+#endif
+
if (config->orig_argv.length == 0
&& !(config->argv.length == 1
&& wcscmp(config->argv.items[0], L"") == 0))
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