tree-wide: make sigactions static const

src/core/crash-handler.c

@@ -52,8 +52,13 @@ _noreturn_ void freeze_or_exit_or_reboot(void) {
 }
 
 _noreturn_ static void crash(int sig, siginfo_t *siginfo, void *context) {
-        struct sigaction sa;
+        static const struct sigaction sa_nocldwait = {
+                .sa_handler = SIG_IGN,
+                .sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART,
+        };
+
         pid_t pid;
+        int r;
 
         /* NB: 💣 💣 💣 This is a signal handler, most likely executed in a situation where we have corrupted
          * memory. Thus: please avoid any libc memory allocation here, or any functions that internally use
@@ -94,7 +99,6 @@ _noreturn_ static void crash(int sig, siginfo_t *siginfo, void *context) {
                         _exit(EXIT_EXCEPTION);
                 } else {
                         siginfo_t status;
-                        int r;
 
                         if (siginfo) {
                                 if (siginfo->si_pid == 0)
@@ -141,13 +145,8 @@ _noreturn_ static void crash(int sig, siginfo_t *siginfo, void *context) {
         if (arg_crash_chvt >= 0)
                 (void) chvt(arg_crash_chvt);
 
-        sa = (struct sigaction) {
-                .sa_handler = SIG_IGN,
-                .sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART,
-        };
-
         /* Let the kernel reap children for us */
-        (void) sigaction(SIGCHLD, &sa, NULL);
+        (void) sigaction(SIGCHLD, &sa_nocldwait, NULL);
 
         if (arg_crash_shell) {
                 log_notice("Executing crash shell...");

src/core/manager.c

@@ -517,7 +517,7 @@ static int manager_enable_special_signals(Manager *m) {
 #define RTSIG_IF_AVAILABLE(signum) (signum <= SIGRTMAX ? signum : -1)
 
 static int manager_setup_signals(Manager *m) {
-        struct sigaction sa = {
+        static const struct sigaction sa = {
                 .sa_handler = SIG_DFL,
                 .sa_flags = SA_NOCLDSTOP|SA_RESTART,
         };