tree-wide: introduce strerror_safe()

src/core/execute.c

@@ -4891,7 +4891,7 @@ static void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
         cmd = exec_command_line(c->argv);
         fprintf(f,
                 "%sCommand Line: %s\n",
-                prefix, cmd ? cmd : strerror(ENOMEM));
+                prefix, cmd ? cmd : strerror_safe(ENOMEM));
 
         exec_status_dump(&c->exec_status, f, prefix2);
 }

src/core/path.c

@@ -89,7 +89,7 @@ int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) {
                                 break;
                         }
 
-                        r = log_warning_errno(errno, "Failed to add watch on %s: %s", s->path, errno == ENOSPC ? "too many watches" : strerror(-r));
+                        r = log_warning_errno(errno, "Failed to add watch on %s: %s", s->path, errno == ENOSPC ? "too many watches" : strerror_safe(r));
                         if (cut)
                                 *cut = tmp;
                         goto fail;

src/core/selinux-access.c

@@ -17,6 +17,7 @@
 #include "alloc-util.h"
 #include "audit-fd.h"
 #include "bus-util.h"
+#include "errno-util.h"
 #include "format-util.h"
 #include "log.h"
 #include "path-util.h"
@@ -158,7 +159,7 @@ static int access_init(sd_bus_error *error) {
                 /* Return an access denied error, if we couldn't load
                  * the AVC but enforcing mode was on, or we couldn't
                  * determine whether it is one. */
-                return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Failed to open the SELinux AVC: %s", strerror(saved_errno));
+                return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Failed to open the SELinux AVC: %s", strerror_safe(saved_errno));
         }
 
         selinux_set_callback(SELINUX_CB_AUDIT, (union selinux_callback) audit_callback);

src/core/socket.c

@@ -782,7 +782,7 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 
                         r = socket_address_print(&p->address, &k);
                         if (r < 0)
-                                t = strerror(-r);
+                                t = strerror_safe(r);
                         else
                                 t = k;
 

src/core/unit.c

@@ -1326,7 +1326,7 @@ void unit_dump(Unit *u, FILE *f, const char *prefix) {
                         "%s\tMerged into: %s\n",
                         prefix, u->merged_into->id);
         else if (u->load_state == UNIT_ERROR)
-                fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->load_error));
+                fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror_safe(u->load_error));
 
         for (n = sd_bus_track_first(u->bus_track); n; n = sd_bus_track_next(u->bus_track))
                 fprintf(f, "%s\tBus Ref: %s\n", prefix, n);