Issue #18756: Improve error reporting in os.urandom() when the failure is due to something else than /dev/urandom not existing.

1 files changed, 6 insertions, 2 deletions

diff --git a/Python/random.c b/Python/random.c
index 1ad4c3df7f..709f980dca 100644
--- a/Python/random.c
+++ b/Python/random.c
@@ -138,8 +138,12 @@ dev_urandom_python(char *buffer, Py_ssize_t size)
     Py_END_ALLOW_THREADS
     if (fd < 0)
     {
-        PyErr_SetString(PyExc_NotImplementedError,
-                        "/dev/urandom (or equivalent) not found");
+        if (errno == ENOENT || errno == ENXIO ||
+            errno == ENODEV || errno == EACCES)
+            PyErr_SetString(PyExc_NotImplementedError,
+                            "/dev/urandom (or equivalent) not found");
+        else
+            PyErr_SetFromErrno(PyExc_OSError);
         return -1;
     }