treewide: more log_*_errno() conversions, multiline calls

Basically:

find . -name '*.[ch]' | while read f; do perl -i.mmm -e \
'local $/;
 local $_=<>;
 s/log_(debug|info|notice|warning|error|emergency)\("([^"]*)%s"([^;]*),\s*strerror\(-?([->a-zA-Z_]+)\)\);/log_\1_errno(\4, "\2%m"\3);/gms;print;' \
 $f; done

Plus manual indentation fixups.

40 files changed, 232 insertions, 278 deletions

diff --git a/src/activate/activate.c b/src/activate/activate.c
index 70f86bb1e..874b88361 100644
--- a/src/activate/activate.c
+++ b/src/activate/activate.c
@@ -66,8 +66,7 @@ static int open_sockets(int *epoll_fd, bool accept) {
 
         n = sd_listen_fds(true);
         if (n < 0) {
-                log_error("Failed to read listening file descriptors from environment: %s",
-                          strerror(-n));
+                log_error_errno(n, "Failed to read listening file descriptors from environment: %m");
                 return n;
         }
         if (n > 0) {
diff --git a/src/backlight/backlight.c b/src/backlight/backlight.c
index 2f1b3b2f9..218dc0d8c 100644
--- a/src/backlight/backlight.c
+++ b/src/backlight/backlight.c
@@ -285,8 +285,7 @@ int main(int argc, char *argv[]) {
 
         r = mkdir_p("/var/lib/systemd/backlight", 0755);
         if (r < 0) {
-                log_error("Failed to create backlight directory /var/lib/systemd/backlight: %s",
-                          strerror(-r));
+                log_error_errno(r, "Failed to create backlight directory /var/lib/systemd/backlight: %m");
                 return EXIT_FAILURE;
         }
 
@@ -395,8 +394,7 @@ int main(int argc, char *argv[]) {
 
                 r = udev_device_set_sysattr_value(device, "brightness", value);
                 if (r < 0) {
-                        log_error("Failed to write system 'brightness' attribute: %s",
-                                  strerror(-r));
+                        log_error_errno(r, "Failed to write system 'brightness' attribute: %m");
                         return EXIT_FAILURE;
                 }
 
diff --git a/src/bootchart/bootchart.c b/src/bootchart/bootchart.c
index f025c76fb..35c15ab12 100644
--- a/src/bootchart/bootchart.c
+++ b/src/bootchart/bootchart.c
@@ -194,8 +194,8 @@ static int parse_argv(int argc, char *argv[]) {
                 case 'f':
                         r = safe_atod(optarg, &arg_hz);
                         if (r < 0)
-                                log_warning("failed to parse --freq/-f argument '%s': %s",
-                                            optarg, strerror(-r));
+                                log_warning_errno(r, "failed to parse --freq/-f argument '%s': %m",
+                                                  optarg);
                         break;
                 case 'F':
                         arg_filter = false;
@@ -209,8 +209,8 @@ static int parse_argv(int argc, char *argv[]) {
                 case 'n':
                         r = safe_atoi(optarg, &arg_samples_len);
                         if (r < 0)
-                                log_warning("failed to parse --samples/-n argument '%s': %s",
-                                            optarg, strerror(-r));
+                                log_warning_errno(r, "failed to parse --samples/-n argument '%s': %m",
+                                                  optarg);
                         break;
                 case 'o':
                         path_kill_slashes(optarg);
@@ -226,14 +226,14 @@ static int parse_argv(int argc, char *argv[]) {
                 case 'x':
                         r = safe_atod(optarg, &arg_scale_x);
                         if (r < 0)
-                                log_warning("failed to parse --scale-x/-x argument '%s': %s",
-                                            optarg, strerror(-r));
+                                log_warning_errno(r, "failed to parse --scale-x/-x argument '%s': %m",
+                                                  optarg);
                         break;
                 case 'y':
                         r = safe_atod(optarg, &arg_scale_y);
                         if (r < 0)
-                                log_warning("failed to parse --scale-y/-y argument '%s': %s",
-                                            optarg, strerror(-r));
+                                log_warning_errno(r, "failed to parse --scale-y/-y argument '%s': %m",
+                                                  optarg);
                         break;
                 case 'e':
                         arg_entropy = true;
diff --git a/src/cgls/cgls.c b/src/cgls/cgls.c
index 71921c4a8..27420f4f9 100644
--- a/src/cgls/cgls.c
+++ b/src/cgls/cgls.c
@@ -246,8 +246,8 @@ int main(int argc, char *argv[]) {
                         } else
                                 r = cg_get_root_path(&root);
                         if (r < 0) {
-                                log_error("Failed to get %s path: %s",
-                                          arg_machine ? "machine" : "root", strerror(-r));
+                                log_error_errno(r, "Failed to get %s path: %m",
+                                                arg_machine ? "machine" : "root");
                                 goto finish;
                         }
 
diff --git a/src/console/consoled-manager.c b/src/console/consoled-manager.c
index 1b856f222..0eac7ae78 100644
--- a/src/console/consoled-manager.c
+++ b/src/console/consoled-manager.c
@@ -142,15 +142,15 @@ static int manager_sysview_session_add(Manager *m, sysview_event *event) {
 
         r = sysview_session_take_control(session);
         if (r < 0) {
-                log_error("Cannot request session control on '%s': %s",
-                          sysview_session_get_name(session), strerror(-r));
+                log_error_errno(r, "Cannot request session control on '%s': %m",
+                                sysview_session_get_name(session));
                 return r;
         }
 
         r = session_new(&s, m, session);
         if (r < 0) {
-                log_error("Cannot create session on '%s': %s",
-                          sysview_session_get_name(session), strerror(-r));
+                log_error_errno(r, "Cannot create session on '%s': %m",
+                                sysview_session_get_name(session));
                 sysview_session_release_control(session);
                 return r;
         }
@@ -226,8 +226,8 @@ static int manager_sysview_session_control(Manager *m, sysview_event *event) {
                 return 0;
 
         if (error < 0) {
-                log_error("Cannot take session control on '%s': %s",
-                          sysview_session_get_name(session), strerror(-error));
+                log_error_errno(error, "Cannot take session control on '%s': %m",
+                                sysview_session_get_name(session));
                 session_free(s);
                 sysview_session_set_userdata(session, NULL);
                 return -error;
diff --git a/src/console/consoled-session.c b/src/console/consoled-session.c
index c81bb306b..927965e02 100644
--- a/src/console/consoled-session.c
+++ b/src/console/consoled-session.c
@@ -106,8 +106,8 @@ static void session_grdev_fn(grdev_session *grdev, void *userdata, grdev_event *
 
                 r = display_new(&d, s, display);
                 if (r < 0) {
-                        log_error("Cannot create display '%s' on '%s': %s",
-                                  grdev_display_get_name(display), sysview_session_get_name(s->sysview), strerror(-r));
+                        log_error_errno(r, "Cannot create display '%s' on '%s': %m",
+                                        grdev_display_get_name(display), sysview_session_get_name(s->sysview));
                         break;
                 }
 
diff --git a/src/console/consoled-terminal.c b/src/console/consoled-terminal.c
index 166a43b5b..755f23ece 100644
--- a/src/console/consoled-terminal.c
+++ b/src/console/consoled-terminal.c
@@ -189,8 +189,7 @@ static void terminal_feed_keyboard(Terminal *t, idev_data *data) {
                                               kdata->codepoints,
                                               kdata->mods);
                 if (r < 0)
-                        log_error("Cannot feed keyboard data to screen: %s",
-                                  strerror(-r));
+                        log_error_errno(r, "Cannot feed keyboard data to screen: %m");
         }
 }
 
diff --git a/src/core/loopback-setup.c b/src/core/loopback-setup.c
index 6ac1fffd7..ca8ac4ea6 100644
--- a/src/core/loopback-setup.c
+++ b/src/core/loopback-setup.c
@@ -93,13 +93,11 @@ int loopback_setup(void) {
         r = start_loopback(rtnl);
         if (r == -EPERM) {
                 if (check_loopback() < 0) {
-                        log_warning("Failed to configure loopback device: %s",
-                                    strerror(EPERM));
+                        log_warning_errno(EPERM, "Failed to configure loopback device: %m");
                         return -EPERM;
                 }
         } else if (r < 0) {
-                log_warning("Failed to configure loopback device: %s",
-                            strerror(-r));
+                log_warning_errno(r, "Failed to configure loopback device: %m");
                 return r;
         }
 
diff --git a/src/core/main.c b/src/core/main.c
index c204758d4..6224a7ae6 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -1695,7 +1695,7 @@ int main(int argc, char *argv[]) {
                 if (r < 0)
                         log_error("Failed to load default target: %s", bus_error_message(&error, r));
                 else if (target->load_state == UNIT_ERROR || target->load_state == UNIT_NOT_FOUND)
-                        log_error("Failed to load default target: %s", strerror(-target->load_error));
+                        log_error_errno(target->load_error, "Failed to load default target: %m");
                 else if (target->load_state == UNIT_MASKED)
                         log_error("Default target masked.");
 
@@ -1708,7 +1708,7 @@ int main(int argc, char *argv[]) {
                                 error_message = "Failed to load rescue target";
                                 goto finish;
                         } else if (target->load_state == UNIT_ERROR || target->load_state == UNIT_NOT_FOUND) {
-                                log_emergency("Failed to load rescue target: %s", strerror(-target->load_error));
+                                log_emergency_errno(target->load_error, "Failed to load rescue target: %m");
                                 error_message = "Failed to load rescue target";
                                 goto finish;
                         } else if (target->load_state == UNIT_MASKED) {
diff --git a/src/core/manager.c b/src/core/manager.c
index ef58bdd16..c56c1621b 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -238,7 +238,7 @@ static int manager_dispatch_ask_password_fd(sd_event_source *source,
         if (m->have_ask_password < 0)
                 /* Log error but continue. Negative have_ask_password
                  * is treated as unknown status. */
-                log_error("Failed to list /run/systemd/ask-password: %s", strerror(m->have_ask_password));
+                log_error_errno(m->have_ask_password, "Failed to list /run/systemd/ask-password: %m");
 
         return 0;
 }
@@ -730,7 +730,7 @@ static int manager_setup_kdbus(Manager *m) {
                         m->running_as == SYSTEMD_SYSTEM, &p);
 
         if (m->kdbus_fd < 0) {
-                log_debug("Failed to set up kdbus: %s", strerror(-m->kdbus_fd));
+                log_debug_errno(m->kdbus_fd, "Failed to set up kdbus: %m");
                 return m->kdbus_fd;
         }
 
@@ -2699,8 +2699,7 @@ static int create_generator_dir(Manager *m, char **generator, const char *name)
 
                 r = mkdir_p_label(p, 0755);
                 if (r < 0) {
-                        log_error("Failed to create generator directory %s: %s",
-                                  p, strerror(-r));
+                        log_error_errno(r, "Failed to create generator directory %s: %m", p);
                         free(p);
                         return r;
                 }
@@ -2716,8 +2715,7 @@ static int create_generator_dir(Manager *m, char **generator, const char *name)
 
                 r = mkdir_p_label(p, 0755);
                 if (r < 0) {
-                        log_error("Failed to create generator directory %s: %s",
-                                  p, strerror(-r));
+                        log_error_errno(r, "Failed to create generator directory %s: %m", p);
                         free(p);
                         return r;
                 }
diff --git a/src/core/path.c b/src/core/path.c
index ca586d961..202cba5d3 100644
--- a/src/core/path.c
+++ b/src/core/path.c
@@ -562,8 +562,7 @@ static void path_enter_waiting(Path *p, bool initial, bool recheck) {
         return;
 
 fail:
-        log_warning("%s failed to enter waiting state: %s",
-                    UNIT(p)->id, strerror(-r));
+        log_warning_errno(r, "%s failed to enter waiting state: %m", UNIT(p)->id);
         path_enter_dead(p, PATH_FAILURE_RESOURCES);
 }
 
diff --git a/src/initctl/initctl.c b/src/initctl/initctl.c
index 242ad3eca..a0745af71 100644
--- a/src/initctl/initctl.c
+++ b/src/initctl/initctl.c
@@ -290,8 +290,7 @@ static int server_init(Server *s, unsigned n_sockets) {
 
                 r = sd_is_fifo(fd, NULL);
                 if (r < 0) {
-                        log_error("Failed to determine file descriptor type: %s",
-                                  strerror(-r));
+                        log_error_errno(r, "Failed to determine file descriptor type: %m");
                         goto fail;
                 }
 
diff --git a/src/journal-remote/journal-remote-parse.c b/src/journal-remote/journal-remote-parse.c
index 7dd8878ca..47ff368e6 100644
--- a/src/journal-remote/journal-remote-parse.c
+++ b/src/journal-remote/journal-remote-parse.c
@@ -451,8 +451,8 @@ int process_source(RemoteSource *source, bool compress, bool seal) {
 
         r = writer_write(source->writer, &source->iovw, &source->ts, compress, seal);
         if (r < 0)
-                log_error("Failed to write entry of %zu bytes: %s",
-                          iovw_size(&source->iovw), strerror(-r));
+                log_error_errno(r, "Failed to write entry of %zu bytes: %m",
+                                iovw_size(&source->iovw));
         else
                 r = 1;
 
diff --git a/src/journal-remote/journal-remote-write.c b/src/journal-remote/journal-remote-write.c
index bfb6a7dcb..df3004939 100644
--- a/src/journal-remote/journal-remote-write.c
+++ b/src/journal-remote/journal-remote-write.c
@@ -59,11 +59,9 @@ static int do_rotate(JournalFile **f, bool compress, bool seal) {
         int r = journal_file_rotate(f, compress, seal);
         if (r < 0) {
                 if (*f)
-                        log_error("Failed to rotate %s: %s", (*f)->path,
-                                  strerror(-r));
+                        log_error_errno(r, "Failed to rotate %s: %m", (*f)->path);
                 else
-                        log_error("Failed to create rotated journal: %s",
-                                  strerror(-r));
+                        log_error_errno(r, "Failed to create rotated journal: %m");
         }
 
         return r;
diff --git a/src/journal-remote/journal-remote.c b/src/journal-remote/journal-remote.c
index 89a680dcb..d1df83fba 100644
--- a/src/journal-remote/journal-remote.c
+++ b/src/journal-remote/journal-remote.c
@@ -210,8 +210,8 @@ static int open_output(Writer *w, const char* host) {
                                        w->mmap,
                                        NULL, &w->journal);
         if (r < 0)
-                log_error("Failed to open output journal %s: %s",
-                          output, strerror(-r));
+                log_error_errno(r, "Failed to open output journal %s: %m",
+                                output);
         else
                 log_info("Opened output file %s", w->journal->path);
         return r;
@@ -321,8 +321,8 @@ static int get_source_for_fd(RemoteServer *s,
 
         r = get_writer(s, name, &writer);
         if (r < 0) {
-                log_warning("Failed to get writer for source %s: %s",
-                            name, strerror(-r));
+                log_warning_errno(r, "Failed to get writer for source %s: %m",
+                                  name);
                 return r;
         }
 
@@ -376,8 +376,8 @@ static int add_source(RemoteServer *s, int fd, char* name, bool own_name) {
 
         r = get_source_for_fd(s, fd, name, &source);
         if (r < 0) {
-                log_error("Failed to create source for fd:%d (%s): %s",
-                          fd, name, strerror(-r));
+                log_error_errno(r, "Failed to create source for fd:%d (%s): %m",
+                                fd, name);
                 free(name);
                 return r;
         }
@@ -393,8 +393,8 @@ static int add_source(RemoteServer *s, int fd, char* name, bool own_name) {
                         sd_event_source_set_enabled(source->event, SD_EVENT_ON);
         }
         if (r < 0) {
-                log_error("Failed to register event source for fd:%d: %s",
-                          fd, strerror(-r));
+                log_error_errno(r, "Failed to register event source for fd:%d: %m",
+                                fd);
                 goto error;
         }
 
@@ -460,8 +460,8 @@ static int request_meta(void **connection_cls, int fd, char *hostname) {
 
         r = get_writer(server, hostname, &writer);
         if (r < 0) {
-                log_warning("Failed to get writer for source %s: %s",
-                            hostname, strerror(-r));
+                log_warning_errno(r, "Failed to get writer for source %s: %m",
+                                  hostname);
                 return r;
         }
 
@@ -856,8 +856,7 @@ static int remoteserver_init(RemoteServer *s,
 
         n = sd_listen_fds(true);
         if (n < 0) {
-                log_error("Failed to read listening file descriptors from environment: %s",
-                          strerror(-n));
+                log_error_errno(n, "Failed to read listening file descriptors from environment: %m");
                 return n;
         } else
                 log_info("Received %d descriptors", n);
@@ -896,8 +895,8 @@ static int remoteserver_init(RemoteServer *s,
                 }
 
                 if(r < 0) {
-                        log_error("Failed to register socket (fd:%d): %s",
-                                  fd, strerror(-r));
+                        log_error_errno(r, "Failed to register socket (fd:%d): %m",
+                                        fd);
                         return r;
                 }
         }
@@ -1462,15 +1461,15 @@ static int load_certificates(char **key, char **cert, char **trust) {
 
         r = read_full_file(arg_key ?: PRIV_KEY_FILE, key, NULL);
         if (r < 0) {
-                log_error("Failed to read key from file '%s': %s",
-                          arg_key ?: PRIV_KEY_FILE, strerror(-r));
+                log_error_errno(r, "Failed to read key from file '%s': %m",
+                                arg_key ?: PRIV_KEY_FILE);
                 return r;
         }
 
         r = read_full_file(arg_cert ?: CERT_FILE, cert, NULL);
         if (r < 0) {
-                log_error("Failed to read certificate from file '%s': %s",
-                          arg_cert ?: CERT_FILE, strerror(-r));
+                log_error_errno(r, "Failed to read certificate from file '%s': %m",
+                                arg_cert ?: CERT_FILE);
                 return r;
         }
 
@@ -1479,8 +1478,8 @@ static int load_certificates(char **key, char **cert, char **trust) {
         else {
                 r = read_full_file(arg_trust ?: TRUST_FILE, trust, NULL);
                 if (r < 0) {
-                        log_error("Failed to read CA certificate file '%s': %s",
-                                  arg_trust ?: TRUST_FILE, strerror(-r));
+                        log_error_errno(r, "Failed to read CA certificate file '%s': %m",
+                                        arg_trust ?: TRUST_FILE);
                         return r;
                 }
         }
diff --git a/src/journal-remote/journal-upload-journal.c b/src/journal-remote/journal-upload-journal.c
index ace31af0b..6e5e45f7c 100644
--- a/src/journal-remote/journal-upload-journal.c
+++ b/src/journal-remote/journal-upload-journal.c
@@ -134,8 +134,7 @@ static ssize_t write_entry(char *buf, size_t size, Uploader *u) {
                                                       &u->field_data,
                                                       &u->field_length);
                         if (r < 0) {
-                                log_error("Failed to move to next field in entry: %s",
-                                          strerror(-r));
+                                log_error_errno(r, "Failed to move to next field in entry: %m");
                                 return r;
                         } else if (r == 0) {
                                 u->entry_state = ENTRY_OUTRO;
@@ -250,8 +249,7 @@ static size_t journal_input_callback(void *buf, size_t size, size_t nmemb, void
                 if (u->entry_state == ENTRY_DONE) {
                         r = sd_journal_next(j);
                         if (r < 0) {
-                                log_error("Failed to move to next entry in journal: %s",
-                                          strerror(-r));
+                                log_error_errno(r, "Failed to move to next entry in journal: %m");
                                 return CURL_READFUNC_ABORT;
                         } else if (r == 0) {
                                 if (u->input_event)
@@ -392,8 +390,8 @@ int open_journal_for_upload(Uploader *u,
         if (cursor) {
                 r = sd_journal_seek_cursor(j, cursor);
                 if (r < 0) {
-                        log_error("Failed to seek to cursor %s: %s",
-                                  cursor, strerror(-r));
+                        log_error_errno(r, "Failed to seek to cursor %s: %m",
+                                        cursor);
                         return r;
                 }
         }
diff --git a/src/journal-remote/journal-upload.c b/src/journal-remote/journal-upload.c
index 0b9a817b2..e677e1334 100644
--- a/src/journal-remote/journal-upload.c
+++ b/src/journal-remote/journal-upload.c
@@ -87,8 +87,8 @@ static size_t output_callback(char *buf,
         if (nmemb && !u->answer) {
                 u->answer = strndup(buf, size*nmemb);
                 if (!u->answer)
-                        log_warning("Failed to store server answer (%zu bytes): %s",
-                                    size*nmemb, strerror(ENOMEM));
+                        log_warning_errno(ENOMEM, "Failed to store server answer (%zu bytes): %m",
+                                          size*nmemb);
         }
 
         return size * nmemb;
@@ -104,15 +104,15 @@ static int check_cursor_updating(Uploader *u) {
 
         r = mkdir_parents(u->state_file, 0755);
         if (r < 0) {
-                log_error("Cannot create parent directory of state file %s: %s",
-                          u->state_file, strerror(-r));
+                log_error_errno(r, "Cannot create parent directory of state file %s: %m",
+                                u->state_file);
                 return r;
         }
 
         r = fopen_temporary(u->state_file, &f, &temp_path);
         if (r < 0) {
-                log_error("Cannot save state to %s: %s",
-                          u->state_file, strerror(-r));
+                log_error_errno(r, "Cannot save state to %s: %m",
+                                u->state_file);
                 return r;
         }
         unlink(temp_path);
@@ -165,8 +165,8 @@ static int load_cursor_state(Uploader *u) {
         if (r == -ENOENT)
                 log_debug("State file %s is not present.", u->state_file);
         else if (r < 0) {
-                log_error("Failed to read state file %s: %s",
-                          u->state_file, strerror(-r));
+                log_error_errno(r, "Failed to read state file %s: %m",
+                                u->state_file);
                 return r;
         } else
                 log_debug("Last cursor was %s", u->last_cursor);
@@ -786,9 +786,8 @@ static int open_journal(sd_journal **j) {
         else
                 r = sd_journal_open(j, !arg_merge*SD_JOURNAL_LOCAL_ONLY + arg_journal_type);
         if (r < 0)
-                log_error("Failed to open %s: %s",
-                          arg_directory ? arg_directory : arg_file ? "files" : "journal",
-                          strerror(-r));
+                log_error_errno(r, "Failed to open %s: %m",
+                                arg_directory ? arg_directory : arg_file ? "files" : "journal");
         return r;
 }
 
diff --git a/src/journal/catalog.c b/src/journal/catalog.c
index f16e28a7a..67bf4ba01 100644
--- a/src/journal/catalog.c
+++ b/src/journal/catalog.c
@@ -348,8 +348,8 @@ static long write_catalog(const char *database, Hashmap *h, struct strbuf *sb,
 
         r = fopen_temporary(database, &w, &p);
         if (r < 0) {
-                log_error("Failed to open database for writing: %s: %s",
-                          database, strerror(-r));
+                log_error_errno(r, "Failed to open database for writing: %s: %m",
+                                database);
                 return r;
         }
 
@@ -687,8 +687,8 @@ int catalog_list_items(FILE *f, const char *database, bool oneline, char **items
 
                 k = sd_id128_from_string(*item, &id);
                 if (k < 0) {
-                        log_error("Failed to parse id128 '%s': %s",
-                                  *item, strerror(-k));
+                        log_error_errno(k, "Failed to parse id128 '%s': %m",
+                                        *item);
                         if (r == 0)
                                 r = k;
                         continue;
diff --git a/src/journal/coredumpctl.c b/src/journal/coredumpctl.c
index b82c6f453..edc12fead 100644
--- a/src/journal/coredumpctl.c
+++ b/src/journal/coredumpctl.c
@@ -830,8 +830,8 @@ int main(int argc, char *argv[]) {
         SET_FOREACH(match, matches, it) {
                 r = sd_journal_add_match(j, match, strlen(match));
                 if (r != 0) {
-                        log_error("Failed to add match '%s': %s",
-                                  match, strerror(-r));
+                        log_error_errno(r, "Failed to add match '%s': %m",
+                                        match);
                         goto end;
                 }
         }
diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index 1fdd7fc5c..96b0ddd80 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -1662,8 +1662,7 @@ static int access_check(sd_journal *j) {
                 assert(err > 0);
 
                 if (err != EACCES)
-                        log_warning("Error was encountered while opening journal files: %s",
-                                    strerror(err));
+                        log_warning_errno(err, "Error was encountered while opening journal files: %m");
         }
 
         return r;
@@ -1814,9 +1813,8 @@ int main(int argc, char *argv[]) {
         else
                 r = sd_journal_open(&j, !arg_merge*SD_JOURNAL_LOCAL_ONLY + arg_journal_type);
         if (r < 0) {
-                log_error("Failed to open %s: %s",
-                          arg_directory ? arg_directory : arg_file ? "files" : "journal",
-                          strerror(-r));
+                log_error_errno(r, "Failed to open %s: %m",
+                                arg_directory ? arg_directory : arg_file ? "files" : "journal");
                 return EXIT_FAILURE;
         }
 
diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c
index f30a3c139..4f5d002d2 100644
--- a/src/journal/journald-server.c
+++ b/src/journal/journald-server.c
@@ -308,11 +308,11 @@ static int do_rotate(Server *s, JournalFile **f, const char* name,
         r = journal_file_rotate(f, s->compress, seal);
         if (r < 0)
                 if (*f)
-                        log_error("Failed to rotate %s: %s",
-                                  (*f)->path, strerror(-r));
+                        log_error_errno(r, "Failed to rotate %s: %m",
+                                        (*f)->path);
                 else
-                        log_error("Failed to create new %s journal: %s",
-                                  name, strerror(-r));
+                        log_error_errno(r, "Failed to create new %s journal: %m",
+                                        name);
         else
                 server_fix_perms(s, *f, uid);
         return r;
diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c
index 61e64f7f7..d171600ee 100644
--- a/src/journal/sd-journal.c
+++ b/src/journal/sd-journal.c
@@ -1466,8 +1466,8 @@ static int add_directory(sd_journal *j, const char *prefix, const char *dirname)
                     dirent_is_file_with_suffix(de, ".journal~")) {
                         r = add_file(j, m->path, de->d_name);
                         if (r < 0) {
-                                log_debug("Failed to add file %s/%s: %s",
-                                          m->path, de->d_name, strerror(-r));
+                                log_debug_errno(r, "Failed to add file %s/%s: %m",
+                                                m->path, de->d_name);
                                 r = set_put_error(j, r);
                                 if (r < 0)
                                         return r;
@@ -1556,8 +1556,8 @@ static int add_root_directory(sd_journal *j, const char *p) {
                     dirent_is_file_with_suffix(de, ".journal~")) {
                         r = add_file(j, m->path, de->d_name);
                         if (r < 0) {
-                                log_debug("Failed to add file %s/%s: %s",
-                                          m->path, de->d_name, strerror(-r));
+                                log_debug_errno(r, "Failed to add file %s/%s: %m",
+                                                m->path, de->d_name);
                                 r = set_put_error(j, r);
                                 if (r < 0)
                                         return r;
@@ -2218,8 +2218,8 @@ static void process_inotify_event(sd_journal *j, struct inotify_event *e) {
                         if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) {
                                 r = add_file(j, d->path, e->name);
                                 if (r < 0) {
-                                        log_debug("Failed to add file %s/%s: %s",
-                                                  d->path, e->name, strerror(-r));
+                                        log_debug_errno(r, "Failed to add file %s/%s: %m",
+                                                        d->path, e->name);
                                         set_put_error(j, r);
                                 }
 
diff --git a/src/libsystemd-terminal/grdev-drm.c b/src/libsystemd-terminal/grdev-drm.c
index 48f8e9ce9..2d678e8ac 100644
--- a/src/libsystemd-terminal/grdev-drm.c
+++ b/src/libsystemd-terminal/grdev-drm.c
@@ -2186,8 +2186,8 @@ static void grdrm_card_hotplug(grdrm_card *card) {
         card->ready = false;
         r = grdrm_card_resync(card);
         if (r < 0) {
-                log_debug("grdrm: %s/%s: cannot re-sync card: %s",
-                          card->base.session->name, card->base.name, strerror(-r));
+                log_debug_errno(r, "grdrm: %s/%s: cannot re-sync card: %m",
+                                card->base.session->name, card->base.name);
                 return;
         }
 
@@ -2415,8 +2415,8 @@ static int grdrm_card_open(grdrm_card *card, int dev_fd) {
         r = ioctl(card->fd, DRM_IOCTL_GET_CAP, &cap);
         card->cap_dumb = r >= 0 && cap.value;
         if (r < 0)
-                log_debug("grdrm: %s/%s: cannot retrieve DUMB_BUFFER capability: %s",
-                          card->base.session->name, card->base.name, strerror(-r));
+                log_debug_errno(r, "grdrm: %s/%s: cannot retrieve DUMB_BUFFER capability: %m",
+                                card->base.session->name, card->base.name);
         else if (!card->cap_dumb)
                 log_debug("grdrm: %s/%s: DUMB_BUFFER capability not supported",
                           card->base.session->name, card->base.name);
@@ -2427,8 +2427,8 @@ static int grdrm_card_open(grdrm_card *card, int dev_fd) {
         r = ioctl(card->fd, DRM_IOCTL_GET_CAP, &cap);
         card->cap_monotonic = r >= 0 && cap.value;
         if (r < 0)
-                log_debug("grdrm: %s/%s: cannot retrieve TIMESTAMP_MONOTONIC capability: %s",
-                          card->base.session->name, card->base.name, strerror(-r));
+                log_debug_errno(r, "grdrm: %s/%s: cannot retrieve TIMESTAMP_MONOTONIC capability: %m",
+                                card->base.session->name, card->base.name);
         else if (!card->cap_monotonic)
                 log_debug("grdrm: %s/%s: TIMESTAMP_MONOTONIC is disabled globally, fix this NOW!",
                           card->base.session->name, card->base.name);
@@ -2507,8 +2507,8 @@ static void unmanaged_card_enable(grdev_card *basecard) {
 
                 r = grdrm_card_open(&cu->card, fd);
                 if (r < 0) {
-                        log_debug("grdrm: %s/%s: cannot open: %s",
-                                  basecard->session->name, basecard->name, strerror(-r));
+                        log_debug_errno(r, "grdrm: %s/%s: cannot open: %m",
+                                        basecard->session->name, basecard->name);
                         return;
                 }
         }
@@ -2580,8 +2580,8 @@ static int unmanaged_card_new(grdev_card **out, grdev_session *session, struct u
 
                 r = grdrm_card_open(&cu->card, fd);
                 if (r < 0)
-                        log_debug("grdrm: %s/%s: cannot open: %s",
-                                  basecard->session->name, basecard->name, strerror(-r));
+                        log_debug_errno(r, "grdrm: %s/%s: cannot open: %m",
+                                        basecard->session->name, basecard->name);
         }
 
         if (out)
@@ -2724,8 +2724,8 @@ static int managed_card_pause_device_fn(sd_bus *bus,
                 }
 
                 if (r < 0)
-                        log_debug("grdrm: %s/%s: cannot send PauseDeviceComplete: %s",
-                                  session->name, cm->card.base.name, strerror(-r));
+                        log_debug_errno(r, "grdrm: %s/%s: cannot send PauseDeviceComplete: %m",
+                                        session->name, cm->card.base.name);
         }
 
         return 0;
@@ -2778,8 +2778,8 @@ static int managed_card_resume_device_fn(sd_bus *bus,
 
                 r = grdrm_card_open(&cm->card, fd);
                 if (r < 0) {
-                        log_debug("grdrm: %s/%s: cannot open: %s",
-                                  session->name, cm->card.base.name, strerror(-r));
+                        log_debug_errno(r, "grdrm: %s/%s: cannot open: %m",
+                                        session->name, cm->card.base.name);
                         return 0;
                 }
         }
@@ -2870,8 +2870,8 @@ static int managed_card_take_device_fn(sd_bus *bus,
 
         r = grdrm_card_open(&cm->card, fd);
         if (r < 0) {
-                log_debug("grdrm: %s/%s: cannot open: %s",
-                          session->name, cm->card.base.name, strerror(-r));
+                log_debug_errno(r, "grdrm: %s/%s: cannot open: %m",
+                                session->name, cm->card.base.name);
                 return 0;
         }
 
@@ -2912,8 +2912,8 @@ static void managed_card_take_device(managed_card *cm) {
         return;
 
 error:
-        log_debug("grdrm: %s/%s: cannot send TakeDevice request: %s",
-                  session->name, cm->card.base.name, strerror(-r));
+        log_debug_errno(r, "grdrm: %s/%s: cannot send TakeDevice request: %m",
+                        session->name, cm->card.base.name);
 }
 
 static void managed_card_release_device(managed_card *cm) {
@@ -2955,8 +2955,8 @@ static void managed_card_release_device(managed_card *cm) {
         }
 
         if (r < 0 && r != -ENOTCONN)
-                log_debug("grdrm: %s/%s: cannot send ReleaseDevice: %s",
-                          session->name, cm->card.base.name, strerror(-r));
+                log_debug_errno(r, "grdrm: %s/%s: cannot send ReleaseDevice: %m",
+                                session->name, cm->card.base.name);
 }
 
 static int managed_card_new(grdev_card **out, grdev_session *session, struct udev_device *ud) {
diff --git a/src/libsystemd-terminal/grdev.c b/src/libsystemd-terminal/grdev.c
index 0c21eac55..db87ede76 100644
--- a/src/libsystemd-terminal/grdev.c
+++ b/src/libsystemd-terminal/grdev.c
@@ -577,8 +577,8 @@ static bool display_cache(grdev_display *display) {
 
 out:
         if (r < 0)
-                log_debug("grdev: %s/%s: cannot cache pipes: %s",
-                          display->session->name, display->name, strerror(-r));
+                log_debug_errno(r, "grdev: %s/%s: cannot cache pipes: %m",
+                                display->session->name, display->name);
         return true;
 }
 
@@ -772,8 +772,8 @@ void grdev_pipe_schedule(grdev_pipe *pipe, uint64_t frames) {
         return;
 
 error:
-        log_debug("grdev: %s/%s/%s: cannot schedule vsync timer: %s",
-                  pipe->card->session->name, pipe->card->name, pipe->name, strerror(-r));
+        log_debug_errno(r, "grdev: %s/%s/%s: cannot schedule vsync timer: %m",
+                        pipe->card->session->name, pipe->card->name, pipe->name);
 }
 
 /*
@@ -1176,8 +1176,8 @@ void grdev_session_add_drm(grdev_session *session, struct udev_device *ud) {
 
         r = grdev_drm_card_new(&card, session, ud);
         if (r < 0) {
-                log_debug("grdev: %s: cannot add DRM device for %s: %s",
-                          session->name, udev_device_get_syspath(ud), strerror(-r));
+                log_debug_errno(r, "grdev: %s: cannot add DRM device for %s: %m",
+                                session->name, udev_device_get_syspath(ud));
                 return;
         }
 
@@ -1269,8 +1269,8 @@ static void session_configure(grdev_session *session) {
                         } else if (!display) {
                                 r = grdev_display_new(&display, session, pipe->name);
                                 if (r < 0) {
-                                        log_debug("grdev: %s/%s: cannot create display for pipe %s: %s",
-                                                  session->name, card->name, pipe->name, strerror(-r));
+                                        log_debug_errno(r, "grdev: %s/%s: cannot create display for pipe %s: %m",
+                                                        session->name, card->name, pipe->name);
                                         continue;
                                 }
                         }
diff --git a/src/libsystemd-terminal/idev-evdev.c b/src/libsystemd-terminal/idev-evdev.c
index 63fa89e47..b3e86bfb1 100644
--- a/src/libsystemd-terminal/idev-evdev.c
+++ b/src/libsystemd-terminal/idev-evdev.c
@@ -222,8 +222,8 @@ static int idev_evdev_io(idev_evdev *evdev) {
         }
 
         if (error < 0)
-                log_debug("idev-evdev: %s/%s: error on data event: %s",
-                          e->session->name, e->name, strerror(-error));
+                log_debug_errno(error, "idev-evdev: %s/%s: error on data event: %m",
+                                e->session->name, e->name);
         return error;
 
 error:
@@ -448,8 +448,8 @@ static void unmanaged_evdev_resume(idev_element *e) {
 
         r = idev_evdev_resume(&eu->evdev, fd);
         if (r < 0)
-                log_debug("idev-evdev: %s/%s: cannot resume: %s",
-                          e->session->name, e->name, strerror(-r));
+                log_debug_errno(r, "idev-evdev: %s/%s: cannot resume: %m",
+                                e->session->name, e->name);
 }
 
 static void unmanaged_evdev_pause(idev_element *e) {
@@ -571,8 +571,8 @@ static int managed_evdev_take_device_fn(sd_bus *bus,
 
         r = idev_evdev_resume(&em->evdev, fd);
         if (r < 0)
-                log_debug("idev-evdev: %s/%s: cannot resume: %s",
-                          s->name, e->name, strerror(-r));
+                log_debug_errno(r, "idev-evdev: %s/%s: cannot resume: %m",
+                                s->name, e->name);
 
         return 0;
 }
@@ -621,8 +621,8 @@ static void managed_evdev_enable(idev_element *e) {
         return;
 
 error:
-        log_debug("idev-evdev: %s/%s: cannot send TakeDevice request: %s",
-                  s->name, e->name, strerror(-r));
+        log_debug_errno(r, "idev-evdev: %s/%s: cannot send TakeDevice request: %m",
+                        s->name, e->name);
 }
 
 static void managed_evdev_disable(idev_element *e) {
@@ -679,8 +679,8 @@ static void managed_evdev_disable(idev_element *e) {
         }
 
         if (r < 0 && r != -ENOTCONN)
-                log_debug("idev-evdev: %s/%s: cannot send ReleaseDevice: %s",
-                          s->name, e->name, strerror(-r));
+                log_debug_errno(r, "idev-evdev: %s/%s: cannot send ReleaseDevice: %m",
+                                s->name, e->name);
 }
 
 static void managed_evdev_resume(idev_element *e, int fd) {
@@ -705,8 +705,8 @@ static void managed_evdev_resume(idev_element *e, int fd) {
 
         r = idev_evdev_resume(&em->evdev, fd);
         if (r < 0)
-                log_debug("idev-evdev: %s/%s: cannot resume: %s",
-                          s->name, e->name, strerror(-r));
+                log_debug_errno(r, "idev-evdev: %s/%s: cannot resume: %m",
+                                s->name, e->name);
 
         return;
 }
@@ -776,8 +776,8 @@ static void managed_evdev_pause(idev_element *e, const char *mode) {
                 }
 
                 if (r < 0)
-                        log_debug("idev-evdev: %s/%s: cannot send PauseDeviceComplete: %s",
-                                  s->name, e->name, strerror(-r));
+                        log_debug_errno(r, "idev-evdev: %s/%s: cannot send PauseDeviceComplete: %m",
+                                        s->name, e->name);
         }
 }
 
diff --git a/src/libsystemd-terminal/idev-keyboard.c b/src/libsystemd-terminal/idev-keyboard.c
index a26a49a80..e971ab360 100644
--- a/src/libsystemd-terminal/idev-keyboard.c
+++ b/src/libsystemd-terminal/idev-keyboard.c
@@ -284,8 +284,8 @@ static int kbdctx_refresh_compose_table(kbdctx *kc, const char *lang) {
                  * it as a hard-failure but just continue. Preferably, we want
                  * xkb to tell us exactly whether compilation failed or whether
                  * there is no compose file available for this locale. */
-                log_debug("idev-keyboard: cannot load compose-table for '%s': %s",
-                          lang, strerror(-r));
+                log_debug_errno(r, "idev-keyboard: cannot load compose-table for '%s': %m",
+                                lang);
                 r = 0;
                 kt = NULL;
         }
@@ -333,8 +333,7 @@ static int kbdctx_refresh_keymap(kbdctx *kc) {
         r = kbdmap_new_from_names(&km, kc, kc->last_x11_model, kc->last_x11_layout,
                                   kc->last_x11_variant, kc->last_x11_options);
         if (r < 0) {
-                log_debug("idev-keyboard: cannot create keymap from locale1: %s",
-                          strerror(-r));
+                log_debug_errno(r, "idev-keyboard: cannot create keymap from locale1: %m");
                 return r;
         }
 
@@ -648,8 +647,8 @@ static int keyboard_raise_data(idev_keyboard *k, idev_data *data) {
 
         r = idev_session_raise_device_data(d->session, d, data);
         if (r < 0)
-                log_debug("idev-keyboard: %s/%s: error while raising data event: %s",
-                          d->session->name, d->name, strerror(-r));
+                log_debug_errno(r, "idev-keyboard: %s/%s: error while raising data event: %m",
+                                d->session->name, d->name);
 
         return r;
 }
@@ -952,8 +951,8 @@ static void keyboard_repeat(idev_keyboard *k) {
                         r = keyboard_fill(k, repdata, false, evkbd->keycode, KBDKEY_REPEAT, num, keysyms);
 
                 if (r < 0) {
-                        log_debug("idev-keyboard: %s/%s: cannot set key-repeat: %s",
-                                  d->session->name, d->name, strerror(-r));
+                        log_debug_errno(r, "idev-keyboard: %s/%s: cannot set key-repeat: %m",
+                                        d->session->name, d->name);
                         k->repeating = false;
                         keyboard_arm(k, 0);
                 } else {
@@ -977,8 +976,8 @@ static void keyboard_repeat(idev_keyboard *k) {
                         r = keyboard_fill(k, repdata, false, repkbd->keycode, KBDKEY_REPEAT, num, keysyms);
 
                 if (r < 0) {
-                        log_debug("idev-keyboard: %s/%s: cannot update key-repeat: %s",
-                                  d->session->name, d->name, strerror(-r));
+                        log_debug_errno(r, "idev-keyboard: %s/%s: cannot update key-repeat: %m",
+                                        d->session->name, d->name);
                         k->repeating = false;
                         keyboard_arm(k, 0);
                 }
@@ -1067,8 +1066,8 @@ static int keyboard_feed_evdev(idev_keyboard *k, idev_data *data) {
         return keyboard_raise_data(k, &k->evdata);
 
 error:
-        log_debug("idev-keyboard: %s/%s: cannot handle event: %s",
-                  d->session->name, d->name, strerror(-r));
+        log_debug_errno(r, "idev-keyboard: %s/%s: cannot handle event: %m",
+                        d->session->name, d->name);
         k->repeating = false;
         keyboard_arm(k, 0);
         return 0;
@@ -1128,8 +1127,8 @@ static int keyboard_update_kbdmap(idev_keyboard *k) {
         return 0;
 
 error:
-        log_debug("idev-keyboard: %s/%s: cannot adopt new keymap: %s",
-                  d->session->name, d->name, strerror(-r));
+        log_debug_errno(r, "idev-keyboard: %s/%s: cannot adopt new keymap: %m",
+                        d->session->name, d->name);
         return r;
 }
 
@@ -1162,8 +1161,8 @@ static int keyboard_update_kbdtbl(idev_keyboard *k) {
         return 0;
 
 error:
-        log_debug("idev-keyboard: %s/%s: cannot adopt new compose table: %s",
-                  d->session->name, d->name, strerror(-r));
+        log_debug_errno(r, "idev-keyboard: %s/%s: cannot adopt new compose table: %m",
+                        d->session->name, d->name);
         return r;
 }
 
diff --git a/src/libsystemd-terminal/idev.c b/src/libsystemd-terminal/idev.c
index e979b608b..989683f39 100644
--- a/src/libsystemd-terminal/idev.c
+++ b/src/libsystemd-terminal/idev.c
@@ -351,8 +351,8 @@ static int session_add_device(idev_session *s, idev_device *d) {
 
 error:
         if (r < 0)
-                log_debug("idev: %s: error while adding device '%s': %s",
-                          s->name, d->name, strerror(-r));
+                log_debug_errno(r, "idev: %s: error while adding device '%s': %m",
+                                s->name, d->name);
         return r;
 }
 
@@ -372,8 +372,8 @@ static int session_remove_device(idev_session *s, idev_device *d) {
         idev_device_disable(d);
 
         if (error < 0)
-                log_debug("idev: %s: error while removing device '%s': %s",
-                          s->name, d->name, strerror(-error));
+                log_debug_errno(error, "idev: %s: error while removing device '%s': %m",
+                                s->name, d->name);
         idev_device_free(d);
         return error;
 }
@@ -420,8 +420,8 @@ static int session_remove_element(idev_session *s, idev_element *e) {
         element_disable(e);
 
         if (error < 0)
-                log_debug("idev: %s: error while removing element '%s': %s",
-                          s->name, e->name, strerror(-r));
+                log_debug_errno(r, "idev: %s: error while removing element '%s': %m",
+                                s->name, e->name);
         idev_element_free(e);
         return error;
 }
diff --git a/src/libsystemd-terminal/sysview.c b/src/libsystemd-terminal/sysview.c
index 9eb659777..62d9b6606 100644
--- a/src/libsystemd-terminal/sysview.c
+++ b/src/libsystemd-terminal/sysview.c
@@ -295,8 +295,8 @@ static int session_take_control_fn(sd_bus *bus,
 
         r = context_raise_session_control(session->seat->context, session, error);
         if (r < 0)
-                log_debug("sysview: callback failed while signalling session control '%d' on session '%s': %s",
-                          error, session->name, strerror(-r));
+                log_debug_errno(r, "sysview: callback failed while signalling session control '%d' on session '%s': %m",
+                                error, session->name);
 
         return 0;
 }
@@ -365,8 +365,8 @@ void sysview_session_release_control(sysview_session *session) {
                 r = sd_bus_send(session->seat->context->sysbus, m, NULL);
 
         if (r < 0 && r != -ENOTCONN)
-                log_debug("sysview: %s: cannot send ReleaseControl: %s",
-                          session->name, strerror(-r));
+                log_debug_errno(r, "sysview: %s: cannot send ReleaseControl: %m",
+                                session->name);
 }
 
 /*
@@ -604,8 +604,8 @@ static void context_add_device(sysview_context *c, sysview_device *device) {
 
                 r = context_raise_session_attach(c, session, device);
                 if (r < 0)
-                        log_debug("sysview: callback failed while attaching device '%s' to session '%s': %s",
-                                  device->name, session->name, strerror(-r));
+                        log_debug_errno(r, "sysview: callback failed while attaching device '%s' to session '%s': %m",
+                                        device->name, session->name);
         }
 }
 
@@ -625,8 +625,8 @@ static void context_remove_device(sysview_context *c, sysview_device *device) {
 
                 r = context_raise_session_detach(c, session, device);
                 if (r < 0)
-                        log_debug("sysview: callback failed while detaching device '%s' from session '%s': %s",
-                                  device->name, session->name, strerror(-r));
+                        log_debug_errno(r, "sysview: callback failed while detaching device '%s' from session '%s': %m",
+                                        device->name, session->name);
         }
 
         sysview_device_free(device);
@@ -648,8 +648,8 @@ static void context_change_device(sysview_context *c, sysview_device *device, st
 
                 r = context_raise_session_refresh(c, session, device, ud);
                 if (r < 0)
-                        log_debug("sysview: callback failed while changing device '%s' on session '%s': %s",
-                                  device->name, session->name, strerror(-r));
+                        log_debug_errno(r, "sysview: callback failed while changing device '%s' on session '%s': %m",
+                                        device->name, session->name);
         }
 }
 
@@ -683,8 +683,8 @@ static void context_add_session(sysview_context *c, sysview_seat *seat, const ch
                 session->public = true;
                 r = context_raise_session_add(c, session);
                 if (r < 0) {
-                        log_debug("sysview: callback failed while adding session '%s': %s",
-                                  session->name, strerror(-r));
+                        log_debug_errno(r, "sysview: callback failed while adding session '%s': %m",
+                                        session->name);
                         session->public = false;
                         goto error;
                 }
@@ -692,8 +692,8 @@ static void context_add_session(sysview_context *c, sysview_seat *seat, const ch
                 HASHMAP_FOREACH(device, seat->device_map, i) {
                         r = context_raise_session_attach(c, session, device);
                         if (r < 0)
-                                log_debug("sysview: callback failed while attaching device '%s' to new session '%s': %s",
-                                          device->name, session->name, strerror(-r));
+                                log_debug_errno(r, "sysview: callback failed while attaching device '%s' to new session '%s': %m",
+                                                device->name, session->name);
                 }
         }
 
@@ -701,8 +701,8 @@ static void context_add_session(sysview_context *c, sysview_seat *seat, const ch
 
 error:
         if (r < 0)
-                log_debug("sysview: error while adding session '%s': %s",
-                          id, strerror(-r));
+                log_debug_errno(r, "sysview: error while adding session '%s': %m",
+                                id);
 }
 
 static void context_remove_session(sysview_context *c, sysview_session *session) {
@@ -719,15 +719,15 @@ static void context_remove_session(sysview_context *c, sysview_session *session)
                 HASHMAP_FOREACH(device, session->seat->device_map, i) {
                         r = context_raise_session_detach(c, session, device);
                         if (r < 0)
-                                log_debug("sysview: callback failed while detaching device '%s' from old session '%s': %s",
-                                          device->name, session->name, strerror(-r));
+                                log_debug_errno(r, "sysview: callback failed while detaching device '%s' from old session '%s': %m",
+                                                device->name, session->name);
                 }
 
                 session->public = false;
                 r = context_raise_session_remove(c, session);
                 if (r < 0)
-                        log_debug("sysview: callback failed while removing session '%s': %s",
-                                  session->name, strerror(-r));
+                        log_debug_errno(r, "sysview: callback failed while removing session '%s': %m",
+                                        session->name);
         }
 
         if (!session->custom)
@@ -756,8 +756,8 @@ static void context_add_seat(sysview_context *c, const char *id) {
         seat->public = true;
         r = context_raise_seat_add(c, seat);
         if (r < 0) {
-                log_debug("sysview: callback failed while adding seat '%s': %s",
-                          seat->name, strerror(-r));
+                log_debug_errno(r, "sysview: callback failed while adding seat '%s': %m",
+                                seat->name);
                 seat->public = false;
         }
 
@@ -765,8 +765,8 @@ static void context_add_seat(sysview_context *c, const char *id) {
 
 error:
         if (r < 0)
-                log_debug("sysview: error while adding seat '%s': %s",
-                          id, strerror(-r));
+                log_debug_errno(r, "sysview: error while adding seat '%s': %m",
+                                id);
 }
 
 static void context_remove_seat(sysview_context *c, sysview_seat *seat) {
@@ -789,8 +789,8 @@ static void context_remove_seat(sysview_context *c, sysview_seat *seat) {
                 seat->public = false;
                 r = context_raise_seat_remove(c, seat);
                 if (r < 0)
-                        log_debug("sysview: callback failed while removing seat '%s': %s",
-                                  seat->name, strerror(-r));
+                        log_debug_errno(r, "sysview: callback failed while removing seat '%s': %m",
+                                        seat->name);
         }
 
         sysview_seat_free(seat);
@@ -976,8 +976,8 @@ static int context_ud_hotplug(sysview_context *c, struct udev_device *d) {
 
                 r = device_new_ud(&device, seat, type, d);
                 if (r < 0) {
-                        log_debug("sysview: cannot create device for udev-device '%s': %s",
-                                  syspath, strerror(-r));
+                        log_debug_errno(r, "sysview: cannot create device for udev-device '%s': %m",
+                                        syspath);
                         return r;
                 }
 
@@ -1083,8 +1083,8 @@ static int context_ud_scan(sysview_context *c) {
                 d = udev_device_new_from_syspath(c->ud, name);
                 if (!d) {
                         r = errno > 0 ? -errno : -EFAULT;
-                        log_debug("sysview: cannot create udev-device for %s: %s",
-                                  name, strerror(-r));
+                        log_debug_errno(r, "sysview: cannot create udev-device for %s: %m",
+                                        name);
                         continue;
                 }
 
@@ -1103,8 +1103,7 @@ static int context_ld_seat_new(sysview_context *c, sd_bus_message *signal) {
 
         r = sd_bus_message_read(signal, "so", &id, &path);
         if (r < 0) {
-                log_debug("sysview: cannot parse SeatNew from logind: %s",
-                          strerror(-r));
+                log_debug_errno(r, "sysview: cannot parse SeatNew from logind: %m");
                 return r;
         }
 
@@ -1119,8 +1118,7 @@ static int context_ld_seat_removed(sysview_context *c, sd_bus_message *signal) {
 
         r = sd_bus_message_read(signal, "so", &id, &path);
         if (r < 0) {
-                log_debug("sysview: cannot parse SeatRemoved from logind: %s",
-                          strerror(-r));
+                log_debug_errno(r, "sysview: cannot parse SeatRemoved from logind: %m");
                 return r;
         }
 
@@ -1141,8 +1139,7 @@ static int context_ld_session_new(sysview_context *c, sd_bus_message *signal) {
 
         r = sd_bus_message_read(signal, "so", &id, &path);
         if (r < 0) {
-                log_debug("sysview: cannot parse SessionNew from logind: %s",
-                          strerror(-r));
+                log_debug_errno(r, "sysview: cannot parse SessionNew from logind: %m");
                 return r;
         }
 
@@ -1177,16 +1174,16 @@ static int context_ld_session_new(sysview_context *c, sd_bus_message *signal) {
 
         r = context_raise_session_filter(c, id, seatid, username, uid);
         if (r < 0)
-                log_debug("sysview: callback failed while filtering session '%s': %s",
-                          id, strerror(-r));
+                log_debug_errno(r, "sysview: callback failed while filtering session '%s': %m",
+                                id);
         else if (r > 0)
                 context_add_session(c, seat, id);
 
         return 0;
 
 error:
-        log_debug("sysview: failed retrieving information for new session '%s': %s",
-                  id, strerror(-r));
+        log_debug_errno(r, "sysview: failed retrieving information for new session '%s': %m",
+                        id);
         return r;
 }
 
@@ -1197,8 +1194,7 @@ static int context_ld_session_removed(sysview_context *c, sd_bus_message *signal
 
         r = sd_bus_message_read(signal, "so", &id, &path);
         if (r < 0) {
-                log_debug("sysview: cannot parse SessionRemoved from logind: %s",
-                          strerror(-r));
+                log_debug_errno(r, "sysview: cannot parse SessionRemoved from logind: %m");
                 return r;
         }
 
@@ -1299,8 +1295,7 @@ static int context_ld_list_seats_fn(sd_bus *bus,
         return 0;
 
 error:
-        log_debug("sysview: erroneous ListSeats response from logind: %s",
-                  strerror(-r));
+        log_debug_errno(r, "sysview: erroneous ListSeats response from logind: %m");
         return r;
 }
 
@@ -1344,8 +1339,8 @@ static int context_ld_list_sessions_fn(sd_bus *bus,
                 if (seat) {
                         r = context_raise_session_filter(c, id, seatid, username, uid);
                         if (r < 0)
-                                log_debug("sysview: callback failed while filtering session '%s': %s",
-                                          id, strerror(-r));
+                                log_debug_errno(r, "sysview: callback failed while filtering session '%s': %m",
+                                                id);
                         else if (r > 0)
                                 context_add_session(c, seat, id);
                 }
@@ -1365,8 +1360,7 @@ static int context_ld_list_sessions_fn(sd_bus *bus,
         return 0;
 
 error:
-        log_debug("sysview: erroneous ListSessions response from logind: %s",
-                  strerror(-r));
+        log_debug_errno(r, "sysview: erroneous ListSessions response from logind: %m");
         return r;
 }
 
diff --git a/src/locale/localed.c b/src/locale/localed.c
index f587b224a..119a1da84 100644
--- a/src/locale/localed.c
+++ b/src/locale/localed.c
@@ -1095,8 +1095,8 @@ static int method_set_x11_keyboard(sd_bus *bus, sd_bus_message *m, void *userdat
 
                 r = verify_xkb_rmlvo(model, layout, variant, options);
                 if (r < 0)
-                        log_warning("Cannot compile XKB keymap for new x11 keyboard layout ('%s' / '%s' / '%s' / '%s'): %s",
-                                    strempty(model), strempty(layout), strempty(variant), strempty(options), strerror(-r));
+                        log_warning_errno(r, "Cannot compile XKB keymap for new x11 keyboard layout ('%s' / '%s' / '%s' / '%s'): %m",
+                                          strempty(model), strempty(layout), strempty(variant), strempty(options));
 
                 if (free_and_strdup(&c->x11_layout, layout) < 0 ||
                     free_and_strdup(&c->x11_model, model) < 0 ||
diff --git a/src/modules-load/modules-load.c b/src/modules-load/modules-load.c
index b31dc807f..99aa429ed 100644
--- a/src/modules-load/modules-load.c
+++ b/src/modules-load/modules-load.c
@@ -116,8 +116,7 @@ static int load_module(struct kmod_ctx *ctx, const char *m) {
                         else if (err == KMOD_PROBE_APPLY_BLACKLIST)
                                 log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));
                         else {
-                                log_error("Failed to insert '%s': %s", kmod_module_get_name(mod),
-                                          strerror(-err));
+                                log_error_errno(err, "Failed to insert '%s': %m", kmod_module_get_name(mod));
                                 r = err;
                         }
                 }
diff --git a/src/network/networkd-address.c b/src/network/networkd-address.c
index e95184b8f..9502fa8ca 100644
--- a/src/network/networkd-address.c
+++ b/src/network/networkd-address.c
@@ -118,8 +118,7 @@ int address_drop(Address *address, Link *link,
         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_DELADDR,
                                      link->ifindex, address->family);
         if (r < 0) {
-                log_error("Could not allocate RTM_DELADDR message: %s",
-                          strerror(-r));
+                log_error_errno(r, "Could not allocate RTM_DELADDR message: %m");
                 return r;
         }
 
@@ -134,8 +133,7 @@ int address_drop(Address *address, Link *link,
         else if (address->family == AF_INET6)
                 r = sd_rtnl_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
         if (r < 0) {
-                log_error("Could not append IFA_LOCAL attribute: %s",
-                          strerror(-r));
+                log_error_errno(r, "Could not append IFA_LOCAL attribute: %m");
                 return r;
         }
 
@@ -164,8 +162,7 @@ int address_update(Address *address, Link *link,
         r = sd_rtnl_message_new_addr_update(link->manager->rtnl, &req,
                                      link->ifindex, address->family);
         if (r < 0) {
-                log_error("Could not allocate RTM_NEWADDR message: %s",
-                          strerror(-r));
+                log_error_errno(r, "Could not allocate RTM_NEWADDR message: %m");
                 return r;
         }
 
@@ -192,16 +189,14 @@ int address_update(Address *address, Link *link,
         else if (address->family == AF_INET6)
                 r = sd_rtnl_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
         if (r < 0) {
-                log_error("Could not append IFA_LOCAL attribute: %s",
-                          strerror(-r));
+                log_error_errno(r, "Could not append IFA_LOCAL attribute: %m");
                 return r;
         }
 
         if (address->family == AF_INET) {
                 r = sd_rtnl_message_append_in_addr(req, IFA_BROADCAST, &address->broadcast);
                 if (r < 0) {
-                        log_error("Could not append IFA_BROADCAST attribute: %s",
-                                  strerror(-r));
+                        log_error_errno(r, "Could not append IFA_BROADCAST attribute: %m");
                         return r;
                 }
         }
@@ -209,16 +204,14 @@ int address_update(Address *address, Link *link,
         if (address->label) {
                 r = sd_rtnl_message_append_string(req, IFA_LABEL, address->label);
                 if (r < 0) {
-                        log_error("Could not append IFA_LABEL attribute: %s",
-                                  strerror(-r));
+                        log_error_errno(r, "Could not append IFA_LABEL attribute: %m");
                         return r;
                 }
         }
 
         r = sd_rtnl_message_append_cache_info(req, IFA_CACHEINFO, &address->cinfo);
         if (r < 0) {
-                log_error("Could not append IFA_CACHEINFO attribute: %s",
-                          strerror(-r));
+                log_error_errno(r, "Could not append IFA_CACHEINFO attribute: %m");
                 return r;
         }
 
@@ -313,8 +306,7 @@ int address_configure(Address *address, Link *link,
         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_NEWADDR,
                                      link->ifindex, address->family);
         if (r < 0) {
-                log_error("Could not allocate RTM_NEWADDR message: %s",
-                          strerror(-r));
+                log_error_errno(r, "Could not allocate RTM_NEWADDR message: %m");
                 return r;
         }
 
@@ -341,8 +333,7 @@ int address_configure(Address *address, Link *link,
         else if (address->family == AF_INET6)
                 r = sd_rtnl_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
         if (r < 0) {
-                log_error("Could not append IFA_LOCAL attribute: %s",
-                          strerror(-r));
+                log_error_errno(r, "Could not append IFA_LOCAL attribute: %m");
                 return r;
         }
 
@@ -352,16 +343,14 @@ int address_configure(Address *address, Link *link,
                 else if (address->family == AF_INET6)
                         r = sd_rtnl_message_append_in6_addr(req, IFA_ADDRESS, &address->in_addr_peer.in6);
                 if (r < 0) {
-                        log_error("Could not append IFA_ADDRESS attribute: %s",
-                                  strerror(-r));
+                        log_error_errno(r, "Could not append IFA_ADDRESS attribute: %m");
                         return r;
                 }
         } else {
                 if (address->family == AF_INET) {
                         r = sd_rtnl_message_append_in_addr(req, IFA_BROADCAST, &address->broadcast);
                         if (r < 0) {
-                                log_error("Could not append IFA_BROADCAST attribute: %s",
-                                          strerror(-r));
+                                log_error_errno(r, "Could not append IFA_BROADCAST attribute: %m");
                                 return r;
                         }
                 }
@@ -370,8 +359,7 @@ int address_configure(Address *address, Link *link,
         if (address->label) {
                 r = sd_rtnl_message_append_string(req, IFA_LABEL, address->label);
                 if (r < 0) {
-                        log_error("Could not append IFA_LABEL attribute: %s",
-                                  strerror(-r));
+                        log_error_errno(r, "Could not append IFA_LABEL attribute: %m");
                         return r;
                 }
         }
@@ -379,8 +367,7 @@ int address_configure(Address *address, Link *link,
         r = sd_rtnl_message_append_cache_info(req, IFA_CACHEINFO,
                                               &address->cinfo);
         if (r < 0) {
-                log_error("Could not append IFA_CACHEINFO attribute: %s",
-                          strerror(-r));
+                log_error_errno(r, "Could not append IFA_CACHEINFO attribute: %m");
                 return r;
         }
 
diff --git a/src/network/networkd-manager.c b/src/network/networkd-manager.c
index 98a12c277..3a1d565e7 100644
--- a/src/network/networkd-manager.c
+++ b/src/network/networkd-manager.c
@@ -262,8 +262,7 @@ static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, vo
                         /* link is new, so add it */
                         r = link_add(m, message, &link);
                         if (r < 0) {
-                                log_debug("could not add new link: %s",
-                                           strerror(-r));
+                                log_debug_errno(r, "could not add new link: %m");
                                 return 0;
                         }
                 }
diff --git a/src/network/networkd-netdev-tuntap.c b/src/network/networkd-netdev-tuntap.c
index 7767d7550..57cc77c55 100644
--- a/src/network/networkd-netdev-tuntap.c
+++ b/src/network/networkd-netdev-tuntap.c
@@ -95,8 +95,8 @@ static int netdev_tuntap_add(NetDev *netdev, struct ifreq *ifr) {
 
                 r = get_user_creds(&user, &uid, NULL, NULL, NULL);
                 if (r < 0) {
-                        log_error("Cannot resolve user name %s: %s",
-                                  t->user_name, strerror(-r));
+                        log_error_errno(r, "Cannot resolve user name %s: %m",
+                                        t->user_name);
                         return 0;
                 }
 
@@ -114,8 +114,8 @@ static int netdev_tuntap_add(NetDev *netdev, struct ifreq *ifr) {
 
                 r = get_group_creds(&group, &gid);
                 if (r < 0) {
-                        log_error("Cannot resolve group name %s: %s",
-                                  t->group_name, strerror(-r));
+                        log_error_errno(r, "Cannot resolve group name %s: %m",
+                                        t->group_name);
                         return 0;
                 }
 
diff --git a/src/network/networkd.c b/src/network/networkd.c
index fe5860411..430d615f9 100644
--- a/src/network/networkd.c
+++ b/src/network/networkd.c
@@ -54,18 +54,15 @@ int main(int argc, char *argv[]) {
          * watches in. */
         r = mkdir_safe_label("/run/systemd/netif", 0755, uid, gid);
         if (r < 0)
-                log_error("Could not create runtime directory: %s",
-                          strerror(-r));
+                log_error_errno(r, "Could not create runtime directory: %m");
 
         r = mkdir_safe_label("/run/systemd/netif/links", 0755, uid, gid);
         if (r < 0)
-                log_error("Could not create runtime directory 'links': %s",
-                          strerror(-r));
+                log_error_errno(r, "Could not create runtime directory 'links': %m");
 
         r = mkdir_safe_label("/run/systemd/netif/leases", 0755, uid, gid);
         if (r < 0)
-                log_error("Could not create runtime directory 'leases': %s",
-                          strerror(-r));
+                log_error_errno(r, "Could not create runtime directory 'leases': %m");
 
         r = drop_privileges(uid, gid,
                             (1ULL << CAP_NET_ADMIN) |
diff --git a/src/run/run.c b/src/run/run.c
index ea9454a0e..8c7bd5c92 100644
--- a/src/run/run.c
+++ b/src/run/run.c
@@ -575,10 +575,9 @@ int main(int argc, char* argv[]) {
 
         r = find_binary(argv[optind], arg_transport == BUS_TRANSPORT_LOCAL, &command);
         if (r < 0) {
-                log_error("Failed to find executable %s%s: %s",
-                          argv[optind],
-                          arg_transport == BUS_TRANSPORT_LOCAL ? "" : " on local system",
-                          strerror(-r));
+                log_error_errno(r, "Failed to find executable %s%s: %m",
+                                argv[optind],
+                                arg_transport == BUS_TRANSPORT_LOCAL ? "" : " on local system");
                 goto finish;
         }
         argv[optind] = command;
diff --git a/src/shared/conf-files.c b/src/shared/conf-files.c
index e6ee97a97..51f4e0105 100644
--- a/src/shared/conf-files.c
+++ b/src/shared/conf-files.c
@@ -118,8 +118,8 @@ static int conf_files_list_strv_internal(char ***strv, const char *suffix, const
                 if (r == -ENOMEM) {
                         return r;
                 } else if (r < 0)
-                        log_debug("Failed to search for files in %s: %s",
-                                  *p, strerror(-r));
+                        log_debug_errno(r, "Failed to search for files in %s: %m",
+                                        *p);
         }
 
         files = hashmap_get_strv(fh);
diff --git a/src/shared/conf-parser.c b/src/shared/conf-parser.c
index f9a3459ca..94808fa6c 100644
--- a/src/shared/conf-parser.c
+++ b/src/shared/conf-parser.c
@@ -428,8 +428,8 @@ int config_parse(const char *unit,
 
                 if (r < 0) {
                         if (warn)
-                                log_warning("Failed to parse file '%s': %s",
-                                            filename, strerror(-r));
+                                log_warning_errno(r, "Failed to parse file '%s': %m",
+                                                  filename);
                         return r;
                 }
         }
diff --git a/src/shared/logs-show.c b/src/shared/logs-show.c
index eb15eeac8..16ea1bb78 100644
--- a/src/shared/logs-show.c
+++ b/src/shared/logs-show.c
@@ -426,8 +426,7 @@ static int output_verbose(
                 else {
                         r = safe_atou64(value, &realtime);
                         if (r < 0)
-                                log_debug("Failed to parse realtime timestamp: %s",
-                                          strerror(-r));
+                                log_debug_errno(r, "Failed to parse realtime timestamp: %m");
                 }
         }
 
diff --git a/src/shared/sleep-config.c b/src/shared/sleep-config.c
index e6157f0e9..0fd307d0b 100644
--- a/src/shared/sleep-config.c
+++ b/src/shared/sleep-config.c
@@ -233,8 +233,8 @@ static bool enough_memory_for_hibernation(void) {
 
         r = safe_atollu(active, &act);
         if (r < 0) {
-                log_error("Failed to parse Active(anon) from /proc/meminfo: %s: %s",
-                          active, strerror(-r));
+                log_error_errno(r, "Failed to parse Active(anon) from /proc/meminfo: %s: %m",
+                                active);
                 return false;
         }
 
diff --git a/src/sleep/sleep.c b/src/sleep/sleep.c
index 0d7c1e3fb..626150258 100644
--- a/src/sleep/sleep.c
+++ b/src/sleep/sleep.c
@@ -48,15 +48,14 @@ static int write_mode(char **modes) {
                 if (k == 0)
                         return 0;
 
-                log_debug("Failed to write '%s' to /sys/power/disk: %s",
-                          *mode, strerror(-k));
+                log_debug_errno(k, "Failed to write '%s' to /sys/power/disk: %m",
+                                *mode);
                 if (r == 0)
                         r = k;
         }
 
         if (r < 0)
-                log_error("Failed to write mode to /sys/power/disk: %s",
-                          strerror(-r));
+                log_error_errno(r, "Failed to write mode to /sys/power/disk: %m");
 
         return r;
 }
@@ -71,8 +70,8 @@ static int write_state(FILE **f, char **states) {
                 k = write_string_stream(*f, *state);
                 if (k == 0)
                         return 0;
-                log_debug("Failed to write '%s' to /sys/power/state: %s",
-                          *state, strerror(-k));
+                log_debug_errno(k, "Failed to write '%s' to /sys/power/state: %m",
+                                *state);
                 if (r == 0)
                         r = k;