core/execute: warn when threaded mode is detected

Prompted by #22486.
2022-02-16 15:59:03 +09:00
parent 084e7706c2
commit 702cf08fce
2 changed files with 9 additions and 0 deletions
@@ -346,6 +346,9 @@ int cg_attach(const char *controller, const char *path, pid_t pid) {
        xsprintf(c, PID_FMT "\n", pid);

        r = write_string_file(fs, c, WRITE_STRING_FILE_DISABLE_BUFFER);
+        if (r == -EOPNOTSUPP && cg_is_threaded(controller, path) > 0)
+                /* When the threaded mode is used, we cannot read/write the file. Let's return recognizable error. */
+                return -EUCLEAN;
        if (r < 0)
                return r;