systemd-analyze: added the verb unit-gdb to spawn and attach gdb

src/basic/signal-util.c

@@ -5,6 +5,7 @@
 
 #include "errno-util.h"
 #include "parse-util.h"
+#include "process-util.h"
 #include "signal-util.h"
 #include "stdio-util.h"
 #include "string-table.h"
@@ -319,3 +320,15 @@ int parse_signo(const char *s, int *ret) {
 
         return 0;
 }
+
+void sigterm_process_group_handler(int signal, siginfo_t *info, void *ucontext) {
+        assert(signal == SIGTERM);
+        assert(info);
+
+        /* If the sender is not us, propagate the signal to all processes in
+         * the same process group */
+        if (si_code_from_process(info->si_code) &&
+            pid_is_valid(info->si_pid) &&
+            info->si_pid != getpid_cached())
+                (void) kill(0, signal);
+}

src/basic/signal-util.h

@@ -93,3 +93,5 @@ static inline bool si_code_from_process(int si_code) {
 
         return si_code < 0 || IN_SET(si_code, SI_USER, SI_QUEUE);
 }
+
+void sigterm_process_group_handler(int signal, siginfo_t *info, void *ucontext);