Merge pull request #9726 from dkozovsk/master

signal safety fixes exit ->_exit, call of page_size to prevent call of sysconf from signal handler

src/basic/sigbus.c

@@ -113,6 +113,10 @@ void sigbus_install(void) {
                 .sa_flags = SA_SIGINFO,
         };
 
+        /* make sure that sysconf() is not called from a signal handler because
+        * it is not guaranteed to be async-signal-safe since POSIX.1-2008 */
+        (void) page_size();
+
         n_installed++;
 
         if (n_installed == 1)

src/udev/collect/collect.c

@@ -59,7 +59,7 @@ static inline struct _mate *node_to_mate(struct udev_list_node *node)
 
 _noreturn_ static void sig_alrm(int signo)
 {
-        exit(4);
+        _exit(4);
 }
 
 static void usage(void)