I have checked openssl sources, loogs as `BIO_printf` and `BIO_write` function
to not use lock mechanism.
> The solution would be to either have a lock around and do every time: lock,
> open file, write, close, unlock;
Why we cannot open file once and use logic inside childs
```
lock, write, unlock
```
> I also noticed that the file name is reallocated in pkg using a local
> variable in a function and not freed.
is memory allocated here and not freed?
```diff
@@ -636,6 +710,7 @@ int tls_h_mod_pre_init_f(void)
#endif
SSL_load_error_strings();
tls_mod_preinitialized=1;
+ prepare_keylog_file(cfg_get(tls, tls_cfg, session_keylog_filename));
return 0;
}
```
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