From 424d18529487fa3be6e2419d7ad2c77a62034a0c Mon Sep 17 00:00:00 2001
From: Vincent Batts <vbatts@hashbangbash.com>
Date: Sun, 5 Nov 2017 22:19:48 -0500
Subject: [PATCH] pass through an arg

---
 helloctl/helloctl.c | 13 +++++++++----
 mod_hello.c         |  5 +++--
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/helloctl/helloctl.c b/helloctl/helloctl.c
index 480c3d4..d464cbb 100644
--- a/helloctl/helloctl.c
+++ b/helloctl/helloctl.c
@@ -11,16 +11,21 @@
 
 int main(int argc, char ** argv) {
 	int fd = -1;
+	int ret;
+	int i;
+
 	fd = open(HELLOCTL, O_RDONLY);
 	if (fd < 0) {
 		fprintf(stderr, "Could not open %s\n", HELLOCTL);
 		_exit(1);
 	}
 
-	int ret;
-	if (ret = ioctl(fd, 1, 1) < 0) {
-		fprintf(stderr, "ioctl failed with: %s\n", strerror(ret));
-		goto done;
+
+	for (i=1; i<argc; i++) {
+		if (ret = ioctl(fd, 1, argv[i]) < 0) {
+			fprintf(stderr, "ioctl failed with: %s\n", strerror(ret));
+			goto done;
+		}
 	}
 done:
 	close(fd);
diff --git a/mod_hello.c b/mod_hello.c
index a77e31a..a3f4c2b 100644
--- a/mod_hello.c
+++ b/mod_hello.c
@@ -17,7 +17,8 @@ MODULE_VERSION("1.0");
 static long
 hello_control_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
-    printk(KERN_INFO "[%s] received command: %d\n", __this_module.name, cmd);
+    char * temp = arg;
+    printk(KERN_INFO "[%s] received command: %d (arg %s)\n", __this_module.name, cmd, arg);
     return 0;
 }
 
@@ -43,11 +44,11 @@ static const struct file_operations hello_ctl_fops = {
     .read           = hello_control_read,
 };
 
-
 static struct miscdevice hello_misc = {
     .minor          = MISC_DYNAMIC_MINOR,
     .name           = "helloctl",
     .fops           = &hello_ctl_fops,
+    .mode           = 0666,
 };
 
 MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR);