[Logging] Log correct PID in syslog

src/logging.rs

-/* Copyright 2021 Nicolas Goy
+/* Copyright 2020 Nicolas Goy
+ * Copyright 2021 Dominik George <nik@naturalnet.de>
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -13,6 +14,9 @@
  * limitations under the License.
  */
 
+use std::process;
+use std::convert::TryInto;
+
 use log::{LevelFilter};
 use syslog::{BasicLogger, Facility, Formatter3164};
 
@@ -21,10 +25,9 @@ pub fn setup_log(log_level: LevelFilter) {
         facility: Facility::LOG_AUTHPRIV,
         hostname: None,
         process: "nss_pam_oidc".into(),
-        pid: 0,
+        pid: process::id().try_into().unwrap_or_default(),
     };
     let logger = syslog::unix(formatter).expect("could not connect to syslog");
-    log::set_boxed_logger(Box::new(BasicLogger::new(logger)))
-        .map(|()| log::set_max_level(LevelFilter::Debug));
+    log::set_boxed_logger(Box::new(BasicLogger::new(logger))).ok();
     log::set_max_level(log_level);
 }