+ switch (0)
+ {
+ /* The following are guaranteed by C. */
+ case 0:
+ case SIGABRT:
+ case SIGFPE:
+ case SIGILL:
+ case SIGINT:
+ case SIGSEGV:
+ case SIGTERM:
+ /* The following is guaranteed by gnulib. */
+#if GNULIB_SIGPIPE || defined SIGPIPE
+ case SIGPIPE:
+#endif
+ /* Ensure no conflict with other standardized names. */
+#ifdef SIGALRM
+ case SIGALRM:
+#endif
+ /* On Haiku, SIGBUS is mistakenly equal to SIGSEGV. */
+#if defined SIGBUS && SIGBUS != SIGSEGV
+ case SIGBUS:
+#endif
+#ifdef SIGCHLD
+ case SIGCHLD:
+#endif
+#ifdef SIGCONT
+ case SIGCONT:
+#endif
+#ifdef SIGHUP
+ case SIGHUP:
+#endif
+#ifdef SIGKILL
+ case SIGKILL:
+#endif
+#ifdef SIGQUIT
+ case SIGQUIT:
+#endif
+#ifdef SIGSTOP
+ case SIGSTOP:
+#endif
+#ifdef SIGTSTP
+ case SIGTSTP:
+#endif
+#ifdef SIGTTIN
+ case SIGTTIN:
+#endif
+#ifdef SIGTTOU
+ case SIGTTOU:
+#endif
+#ifdef SIGUSR1
+ case SIGUSR1:
+#endif
+#ifdef SIGUSR2
+ case SIGUSR2:
+#endif
+#ifdef SIGSYS
+ case SIGSYS:
+#endif
+#ifdef SIGTRAP
+ case SIGTRAP:
+#endif
+#ifdef SIGURG
+ case SIGURG:
+#endif
+#ifdef SIGVTALRM
+ case SIGVTALRM:
+#endif
+#ifdef SIGXCPU
+ case SIGXCPU:
+#endif
+#ifdef SIGXFSZ
+ case SIGXFSZ:
+#endif
+ /* SIGRTMIN and SIGRTMAX need not be compile-time constants. */
+#if 0
+# ifdef SIGRTMIN
+ case SIGRTMIN:
+# endif
+# ifdef SIGRTMAX
+ case SIGRTMAX:
+# endif
+#endif
+ ;
+ }
+ return s.a + s.b + s.c + s.e;