From c9cbceab01d4afa983dbfa7ee12c5d5e438b78f5 Mon Sep 17 00:00:00 2001
From: Manuel Traut <manut@linutronix.de>
Date: Wed, 29 Sep 2010 09:14:58 +0200
Subject: kernel-devel/chardev: added example

kernel and userspace example, for open, close, read, write

TODO: implement read, write

Signed-off-by: Manuel Traut <manut@linutronix.de>
---
 kernel-devel/char-device/example/user/Makefile |  6 ++++++
 kernel-devel/char-device/example/user/huhu.c   | 28 ++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 kernel-devel/char-device/example/user/Makefile
 create mode 100644 kernel-devel/char-device/example/user/huhu.c

(limited to 'kernel-devel/char-device/example/user')

diff --git a/kernel-devel/char-device/example/user/Makefile b/kernel-devel/char-device/example/user/Makefile
new file mode 100644
index 0000000..66a330c
--- /dev/null
+++ b/kernel-devel/char-device/example/user/Makefile
@@ -0,0 +1,6 @@
+OBJECTS=huhu.o
+
+all: $(OBJECTS)
+	gcc -o huhu $(OBJECTS)
+clean:
+	rm -f $(OBJECTS) huhu
diff --git a/kernel-devel/char-device/example/user/huhu.c b/kernel-devel/char-device/example/user/huhu.c
new file mode 100644
index 0000000..e86c126
--- /dev/null
+++ b/kernel-devel/char-device/example/user/huhu.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+
+int main (int argc, char **argv)
+{
+	int ret = 0;
+	FILE *fp;
+
+	fp = fopen ("/dev/huhu", "r+");
+	if (!fp)
+	{
+		perror ("open /dev/huhu failed");
+		ret = errno;
+		goto out;
+	}
+
+	system ("/bin/lsmod | grep huhu");
+
+	ret = fclose (fp);
+	if (ret)
+	{
+		perror ("close /dev/huhu failed");
+		goto out;
+	}
+out:
+	return ret;
+}
-- 
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