commit 594e2edfb5e0d24e03469d035d8f39ff29a64d99
author Antonio Gutierrez <chibby0ne@gmail.com> Wed Oct 09 04:19:48 2019 +0200
committer Benjamin Peterson <benjamin@python.org> Tue Oct 08 19:19:48 2019 -0700
tree e40d0cc1fd6a74704b53922f7ec86637e8ebf245
parent e8bedbddadaa86be6bd86dc32dbdbd53933a4988

closes bpo-36161: Use thread-safe ttyname_r instead of ttyname. (GH-14868)

Signed-off-by: Antonio Gutierrez <chibby0ne@gmail.com>

Modules/posixmodule.c

diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 5664027..aeb0e9d 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -2774,13 +2774,24 @@
 os_ttyname_impl(PyObject *module, int fd)
 /*[clinic end generated code: output=c424d2e9d1cd636a input=9ff5a58b08115c55]*/
 {
-    char *ret;
 
-    ret = ttyname(fd);
-    if (ret == NULL) {
+    long size = sysconf(_SC_TTY_NAME_MAX);
+    if (size == -1) {
         return posix_error();
     }
-    return PyUnicode_DecodeFSDefault(ret);
+    char *buffer = (char *)PyMem_RawMalloc(size);
+    if (buffer == NULL) {
+        return PyErr_NoMemory();
+    }
+    int ret = ttyname_r(fd, buffer, size);
+    if (ret != 0) {
+        PyMem_RawFree(buffer);
+        errno = ret;
+        return posix_error();
+    }
+    PyObject *res = PyUnicode_DecodeFSDefault(buffer);
+    PyMem_RawFree(buffer);
+    return res;
 }
 #endif