2 files changed, 94 insertions, 0 deletions
diff --git a/share/examples/kld/syscall/module/Makefile b/share/examples/kld/syscall/module/Makefile
new file mode 100644
index 000000000000..17066d141fce
--- /dev/null
+++ b/share/examples/kld/syscall/module/Makefile
@@ -0,0 +1,7 @@
+# Makefile for building the sample syscall module
+# $FreeBSD$
+
+KMOD=	syscall
+SRCS=	syscall.c
+
+.include <bsd.kmod.mk>
diff --git a/share/examples/kld/syscall/module/syscall.c b/share/examples/kld/syscall/module/syscall.c
new file mode 100644
index 000000000000..3416f3ca10a0
--- /dev/null
+++ b/share/examples/kld/syscall/module/syscall.c
@@ -0,0 +1,87 @@
+/*-
+ * Copyright (c) 1999 Assar Westerlund
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/proc.h>
+#include <sys/module.h>
+#include <sys/sysproto.h>
+#include <sys/sysent.h>
+#include <sys/kernel.h>
+#include <sys/systm.h>
+
+/*
+ * The function for implementing the syscall.
+ */
+
+static int
+hello (struct thread *td, void *arg)
+{
+	printf ("hello kernel\n");
+	return 0;
+}
+
+/*
+ * The `sysent' for the new syscall
+ */
+
+static struct sysent hello_sysent = {
+	0,			/* sy_narg */
+	hello			/* sy_call */
+};
+
+/*
+ * The offset in sysent where the syscall is allocated.
+ */
+
+static int offset = NO_SYSCALL;
+
+/*
+ * The function called at load/unload.
+ */
+
+static int
+load (struct module *module, int cmd, void *arg)
+{
+	int error = 0;
+
+	switch (cmd) {
+	case MOD_LOAD :
+		printf ("syscall loaded at %d\n", offset);
+		break;
+	case MOD_UNLOAD :
+		printf ("syscall unloaded from %d\n", offset);
+		break;
+	default :
+		error = EOPNOTSUPP;
+		break;
+	}
+	return error;
+}
+
+SYSCALL_MODULE(syscall, &offset, &hello_sysent, load, NULL);