From b4aeef458c51b9debd394592e76b93cc6b00e0a2 Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Fri, 18 Sep 1998 15:24:53 +0000
Subject: .

---
 acinclude.m4 | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

(limited to 'acinclude.m4')

diff --git a/acinclude.m4 b/acinclude.m4
index 6fe4337f4..b6c1f656f 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -154,6 +154,50 @@ define(WK_CHECK_IPC,
   ])
 
 
+######################################################################
+# Check whether mlock is broken (hpux 10.20 raises a SIGBUS if mlock
+# is not called from uid 0 (not tested whether uid 0 works)
+######################################################################
+dnl WK_CHECK_MLOCK
+dnl
+define(WK_CHECK_MLOCK,
+  [ AC_CHECK_FUNCS(mlock)
+    if test "$ac_cv_func_mlock" = "yes"; then
+	AC_MSG_CHECKING(whether mlock is broken)
+	  AC_TRY_RUN([
+		#include <unistd.h>
+		#include <errno.h>
+		#include <sys/mman.h>
+		#include <sys/types.h>
+		#include <fcntl.h>
+
+		int main()
+		{
+		    char *pool;
+		    int err;
+		    long int pgsize = getpagesize();
+
+		    pool = malloc( 4096 + pgsize );
+		    if( !pool )
+			return 2;
+		    pool += (pgsize - ((long int)pool % pgsize));
+
+		    err = mlock( pool, 4096 );
+		    if( !err || errno == EPERM )
+			return 0; /* okay */
+
+		    return 1;  /* hmmm */
+		}
+
+	    ],
+	    AC_MSG_RESULT(no),
+	    AC_DEFINE(HAVE_BROKEN_MLOCK)
+	    AC_MSG_RESULT(yes),
+	    AC_MSG_RESULT(assuming no))
+    fi
+  ])
+
+
 ######################################################################
 # progtest.m4 from gettext 0.35
 ######################################################################
-- 
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