for review: delete SA_RESTART test

[Fergus Henderson]

Tyson, could you please review this one?

Estimated hours taken: 0.25

configure.in:
	Delete the test for SA_RESTART.
	The only reason for that test was to warn if SA_RESTART
	was not defined, but the test was giving spurious warnings in
	some cases (e.g. on Linux, due to siginfo_t not being defined),
	so it seems to be doing more harm than good.

Index: configure.in
===================================================================
RCS file: /home/mercury1/repository/mercury/configure.in,v
retrieving revision 1.147
diff -u -r1.147 configure.in
--- configure.in	1999/01/20 16:50:26	1.147
+++ configure.in	1999/02/01 01:52:57
@@ -328,55 +328,6 @@
 	fi
 fi
 #
-# see whether SA_RESTART is defined
-# (we use it if possible, if not available warn about it, because
-# it could cause problems with signal handling).
-#
-AC_MSG_CHECKING(for SA_RESTART)
-AC_CACHE_VAL(mercury_cv_sa_restart,
-AC_TRY_RUN([
-
-#include <signal.h>
-#include <stdlib.h>
-
-#define FAULT_ADDRESS ((int *)112)
-
-extern void handler(int signum, siginfo_t *info, void *context);
-
-int main() {
-	struct sigaction act;
-	act.sa_flags = SA_SIGINFO | SA_RESTART;
-	act.sa_sigaction = handler;
-	if (sigemptyset(&act.sa_mask) != 0)
-		exit(1);
-	if (sigaction(SIGSEGV, &act, NULL) != 0)
-		exit(1);
-	/* provoke a SIGSEGV */
-	(*FAULT_ADDRESS)++;
-	exit(1);
-}
-
-void handler(int signum, siginfo_t *info, void *context) {
-	if (signum == SIGSEGV &&
-	    info->si_signo == SIGSEGV &&
-	    info->si_code > 0 &&
-	    (int *)info->si_addr == FAULT_ADDRESS)
-	{
-		exit(0);
-	} else {
-		exit(1);
-	}
-}],
-[mercury_cv_sa_restart=yes],
-[mercury_cv_sa_restart=no],
-[mercury_cv_sa_restart=no]))
-AC_MSG_RESULT($mercury_cv_sa_restart)
-if test $mercury_cv_sa_restart = yes; then
-	AC_DEFINE(HAVE_SIGINFO)
-else
-	AC_MSG_WARN("using sigaction without SA_RESTART")
-fi
-#
 # check the basics of sigcontext_struct
 #
 AC_MSG_CHECKING(for working \`sigcontext_struct' in second arg)

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "Binaries may die
WWW: <http://www.cs.mu.oz.au/~fjh>  |   but source code lives forever"
PGP: finger fjh at 128.250.37.3        |     -- leaked Microsoft memo.