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From: Gleb Smirnoff <glebius@FreeBSD.org>
Date: Wed, 17 Jul 2013 12:28:49 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r253420 - head/share/examples/kld/syscall/test
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Author: glebius
Date: Wed Jul 17 12:28:48 2013
New Revision: 253420
URL: http://svnweb.freebsd.org/changeset/base/253420

Log:
  Improve example, so that it doesn't dump core when example module
  isn't loaded.

Modified:
  head/share/examples/kld/syscall/test/call.c

Modified: head/share/examples/kld/syscall/test/call.c
==============================================================================
--- head/share/examples/kld/syscall/test/call.c	Wed Jul 17 11:51:24 2013	(r253419)
+++ head/share/examples/kld/syscall/test/call.c	Wed Jul 17 12:28:48 2013	(r253420)
@@ -30,6 +30,7 @@
 #include <sys/module.h>
 #include <sys/syscall.h>
 
+#include <err.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
@@ -37,11 +38,14 @@
 int
 main(int argc __unused, char **argv __unused)
 {
-	int syscall_num;
+	int modid, syscall_num;
 	struct module_stat stat;
 
 	stat.version = sizeof(stat);
-	modstat(modfind("sys/syscall"), &stat);
+	if ((modid = modfind("sys/syscall")) == -1)
+		err(1, "modfind");
+	if (modstat(modid, &stat) != 0)
+		err(1, "mostat");
 	syscall_num = stat.data.intval;
 	return syscall (syscall_num);
 }