Clean up and exit on various fatal signals; allow sys-*.c files

to modify "PPP not available" message.

diff --git a/pppd/main.c b/pppd/main.c
index 632e1791d8c432436c860a3898963ccd717e8015..f4913ff28e7798c9b813640d092cfebde21f3a09 100644 (file)
--- a/pppd/main.c
+++ b/pppd/main.c
@@ -18,7 +18,7 @@
  */
 
 #ifndef lint
-static char rcsid[] = "$Id: main.c,v 1.26 1995/08/10 06:51:42 paulus Exp $";
+static char rcsid[] = "$Id: main.c,v 1.27 1995/08/16 01:39:08 paulus Exp $";
 #endif
 
 #include <stdio.h>
@@ -87,12 +87,15 @@ static int n_children;              /* # child processes still running */
 
 int baud_rate;
 
+char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
+
 /* prototypes */
 static void hup __P((int));
 static void term __P((int));
 static void chld __P((int));
 static void toggle_debug __P((int));
 static void open_ccp __P((int));
+static void bad_signal __P((int));
 
 static void get_input __P((void));
 void establish_ppp __P((void));
@@ -171,7 +174,7 @@ main(argc, argv)
     uid = getuid();
 
     if (!ppp_available()) {
-       fprintf(stderr, "Sorry - PPP is not available on this system\n");
+       fprintf(stderr, no_ppp_msg);
        exit(1);
     }
 
@@ -255,6 +258,45 @@ main(argc, argv)
     SIGNAL(SIGUSR1, toggle_debug);     /* Toggle debug flag */
     SIGNAL(SIGUSR2, open_ccp);         /* Reopen CCP */
 
+    /*
+     * Install a handler for other signals which would otherwise
+     * cause pppd to exit without cleaning up.
+     */
+    SIGNAL(SIGABRT, bad_signal);
+    SIGNAL(SIGALRM, bad_signal);
+    SIGNAL(SIGFPE, bad_signal);
+    SIGNAL(SIGILL, bad_signal);
+    SIGNAL(SIGPIPE, bad_signal);
+    SIGNAL(SIGQUIT, bad_signal);
+    SIGNAL(SIGSEGV, bad_signal);
+#ifdef SIGBUS
+    SIGNAL(SIGBUS, bad_signal);
+#endif
+#ifdef SIGEMT
+    SIGNAL(SIGEMT, bad_signal);
+#endif
+#ifdef SIGPOLL
+    SIGNAL(SIGPOLL, bad_signal);
+#endif
+#ifdef SIGPROF
+    SIGNAL(SIGPROF, bad_signal);
+#endif
+#ifdef SIGSYS
+    SIGNAL(SIGSYS, bad_signal);
+#endif
+#ifdef SIGTRAP
+    SIGNAL(SIGTRAP, bad_signal);
+#endif
+#ifdef SIGVTALRM
+    SIGNAL(SIGVTALRM, bad_signal);
+#endif
+#ifdef SIGXCPU
+    SIGNAL(SIGXCPU, bad_signal);
+#endif
+#ifdef SIGXFSZ
+    SIGNAL(SIGXFSZ, bad_signal);
+#endif
+
     /*
      * Lock the device if we've been asked to.
      */
@@ -482,12 +524,23 @@ demuxprotrej(unit, protocol)
 
 
 /*
- * quit - Clean up state and exit.
+ * bad_signal - We've caught a fatal signal.  Clean up state and exit.
+ */
+static void
+bad_signal(sig)
+    int sig;
+{
+    syslog(LOG_ERR, "Fatal signal %d", sig);
+    die(1);
+}
+
+/*
+ * quit - Clean up state and exit (with an error indication).
  */
 void 
 quit()
 {
-    die(0);
+    die(1);
 }
 
 /*