log: add an "error" parameter to all low-level logging calls and intrdouce log_error_errno() as log calls that take error numbers

This change has two benefits:

- The format string %m will now resolve to the specified error (or to
  errno if the specified error is 0. This allows getting rid of a ton of
  strerror() invocations, a function that is not thread-safe.

- The specified error can be passed to the journal in the ERRNO= field.

Now of course, we just need somebody to convert all cases of this:

        log_error("Something happened: %s", strerror(-r));

into thus:

        log_error_errno(-r, "Something happened: %m");

1 files changed, 1 insertions, 1 deletions

diff --git a/src/network/networkd-netdev.h b/src/network/networkd-netdev.h
index a6fad2dbc4..54339aec73 100644
--- a/src/network/networkd-netdev.h
+++ b/src/network/networkd-netdev.h
@@ -192,7 +192,7 @@ const struct ConfigPerfItem* network_netdev_gperf_lookup(const char *key, unsign
 
 /* Macros which append INTERFACE= to the message */
 
-#define log_full_netdev(level, netdev, fmt, ...) log_meta_object(level, __FILE__, __LINE__, __func__, "INTERFACE=", netdev->ifname, "%-*s: " fmt, IFNAMSIZ, netdev->ifname, ##__VA_ARGS__)
+#define log_full_netdev(level, netdev, fmt, ...) log_meta_object(level, 0, __FILE__, __LINE__, __func__, "INTERFACE=", netdev->ifname, "%-*s: " fmt, IFNAMSIZ, netdev->ifname, ##__VA_ARGS__)
 #define log_debug_netdev(netdev, ...)       log_full_netdev(LOG_DEBUG, netdev, ##__VA_ARGS__)
 #define log_info_netdev(netdev, ...)        log_full_netdev(LOG_INFO, netdev, ##__VA_ARGS__)
 #define log_notice_netdev(netdev, ...)      log_full_netdev(LOG_NOTICE, netdev, ##__VA_ARGS__)