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");

5 files changed, 4 insertions, 6 deletions

diff --git a/src/network/networkd-ipv4ll.c b/src/network/networkd-ipv4ll.c
index 5467bc372e..fd55f79693 100644
--- a/src/network/networkd-ipv4ll.c
+++ b/src/network/networkd-ipv4ll.c
@@ -40,8 +40,7 @@ static int ipv4ll_address_lost(Link *link) {
         if (r < 0)
                 return 0;
 
-        log_debug_link(link, "IPv4 link-local release %u.%u.%u.%u",
-                       ADDRESS_FMT_VAL(addr));
+        log_debug_link(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr));
 
         r = address_new_dynamic(&address);
         if (r < 0) {
diff --git a/src/network/networkd-link.h b/src/network/networkd-link.h
index 7acf404f87..5eb4b88931 100644
--- a/src/network/networkd-link.h
+++ b/src/network/networkd-link.h
@@ -132,7 +132,7 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_unref);
 
 /* Macros which append INTERFACE= to the message */
 
-#define log_full_link(level, link, fmt, ...) log_meta_object(level, __FILE__, __LINE__, __func__, "INTERFACE=", link->ifname, "%-*s: " fmt, IFNAMSIZ, link->ifname, ##__VA_ARGS__)
+#define log_full_link(level, link, fmt, ...) log_meta_object(level, 0, __FILE__, __LINE__, __func__, "INTERFACE=", link->ifname, "%-*s: " fmt, IFNAMSIZ, link->ifname, ##__VA_ARGS__)
 #define log_debug_link(link, ...)       log_full_link(LOG_DEBUG, link, ##__VA_ARGS__)
 #define log_info_link(link, ...)        log_full_link(LOG_INFO, link, ##__VA_ARGS__)
 #define log_notice_link(link, ...)      log_full_link(LOG_NOTICE, link, ##__VA_ARGS__)
diff --git a/src/network/networkd-netdev.c b/src/network/networkd-netdev.c
index fd1f51ec56..bdb0b888a0 100644
--- a/src/network/networkd-netdev.c
+++ b/src/network/networkd-netdev.c
@@ -65,7 +65,6 @@ static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
 DEFINE_CONFIG_PARSE_ENUM(config_parse_netdev_kind, netdev_kind, NetDevKind, "Failed to parse netdev kind");
 
-
 static void netdev_cancel_callbacks(NetDev *netdev) {
         _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
         netdev_join_callback *callback;
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__)
diff --git a/src/network/networkd.h b/src/network/networkd.h
index 19a661e131..9acf31cd1d 100644
--- a/src/network/networkd.h
+++ b/src/network/networkd.h
@@ -336,7 +336,7 @@ int address_pool_acquire(AddressPool *p, unsigned prefixlen, union in_addr_union
 
 /* Macros which append INTERFACE= to the message */
 
-#define log_full_link(level, link, fmt, ...) log_meta_object(level, __FILE__, __LINE__, __func__, "INTERFACE=", link->ifname, "%-*s: " fmt, IFNAMSIZ, link->ifname, ##__VA_ARGS__)
+#define log_full_link(level, link, fmt, ...) log_meta_object(level, 0, __FILE__, __LINE__, __func__, "INTERFACE=", link->ifname, "%-*s: " fmt, IFNAMSIZ, link->ifname, ##__VA_ARGS__)
 #define log_debug_link(link, ...)       log_full_link(LOG_DEBUG, link, ##__VA_ARGS__)
 #define log_info_link(link, ...)        log_full_link(LOG_INFO, link, ##__VA_ARGS__)
 #define log_notice_link(link, ...)      log_full_link(LOG_NOTICE, link, ##__VA_ARGS__)