Drop special handling of SIGSYS.

Tolerance for up to 25 SIGSYS deliveries was added to init(8) soon after
the addition of sysctl(2) at CSRG, presumably to ease the transition to
the new ABI.

After 25 years of work the ABI transition is finally complete and we can
now safely remove this splint.

In general, we now have better practices and methods for helping userspace
across kernel ABI breaks.

ok deraadt@

diff --git a/sbin/init/init.c b/sbin/init/init.c
index 16e12c2..f854c6a 100644 (file)
--- a/sbin/init/init.c
+++ b/sbin/init/init.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: init.c,v 1.67 2018/01/31 15:57:44 cheloha Exp $       */
+/*     $OpenBSD: init.c,v 1.68 2018/08/24 18:36:56 cheloha Exp $       */
 /*     $NetBSD: init.c,v 1.22 1996/05/15 23:29:33 jtc Exp $    */
 
 /*-
@@ -91,7 +91,6 @@ void stall(char *, ...);
 void warning(char *, ...);
 void emergency(char *, ...);
 void disaster(int);
-void badsys(int);
 
 typedef enum {
        invalid_state,
@@ -261,9 +260,8 @@ main(int argc, char *argv[])
         * We catch or block signals rather than ignore them,
         * so that they get reset on exec.
         */
-       handle(badsys, SIGSYS, 0);
        handle(disaster, SIGABRT, SIGFPE, SIGILL, SIGSEGV,
-           SIGBUS, SIGXCPU, SIGXFSZ, 0);
+           SIGBUS, SIGSYS, SIGXCPU, SIGXFSZ, 0);
        handle(transition_handler, SIGHUP, SIGINT, SIGTERM, SIGTSTP,
             SIGUSR1, SIGUSR2, 0);
        handle(alrm_handler, SIGALRM, 0);
@@ -379,22 +377,6 @@ emergency(char *message, ...)
        va_end(ap);
 }
 
-/*
- * Catch a SIGSYS signal.
- *
- * These may arise if a system does not support sysctl.
- * We tolerate up to 25 of these, then throw in the towel.
- */
-void
-badsys(int sig)
-{
-       static int badcount = 0;
-
-       if (badcount++ < 25)
-               return;
-       disaster(sig);
-}
-
 /*
  * Catch an unexpected signal.
  */