From bacaaf0b7595730904613e86d40400f72682904d Mon Sep 17 00:00:00 2001
From: lonkaars <loek@pipeframe.xyz>
Date: Fri, 19 Apr 2024 12:34:48 +0200
Subject: finish tests

---
 1/fopdrv.c     |  6 ++++--
 1/main.c       |  6 +++---
 1/test/main.c  | 38 ++++++++++++++++++++++++++++++++++++++
 1/test/test.sh | 10 ++++++++++
 4 files changed, 55 insertions(+), 5 deletions(-)

(limited to '1')

diff --git a/1/fopdrv.c b/1/fopdrv.c
index 31c76cd..2c74fea 100644
--- a/1/fopdrv.c
+++ b/1/fopdrv.c
@@ -2,16 +2,18 @@
 
 // driver/char/mem.c read_null (/dev/null)
 ssize_t fop_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) {
+	printk("%s(<file>, <buf>, %lu, <ppos>)\n", __PRETTY_FUNCTION__, count);
 	return 0;
 }
 
 // driver/char/mem.c write_null
 ssize_t fop_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) {
+	printk("%s(<file>, <buf>, %lu, <ppos>)\n", __PRETTY_FUNCTION__, count);
 	return count;
 }
 
 int fop_open(struct inode * inode, struct file * file) {
-	printk("%s\n", __PRETTY_FUNCTION__);
+	printk("%s(<inode>, <file>)\n", __PRETTY_FUNCTION__);
 	return 0;
 	// 0 seems to be a safe return value as it's used in driver/char/mem.c. The
 	// manual page for open(2) says that the system call returns a nonnegative
@@ -20,7 +22,7 @@ int fop_open(struct inode * inode, struct file * file) {
 }
 
 int fop_release(struct inode * inode, struct file * file) {
-	printk("%s\n", __PRETTY_FUNCTION__);
+	printk("%s(<inode>, <file>)\n", __PRETTY_FUNCTION__);
 	return 0;
 	// same as above, but found in driver/char/lp.c
 }
diff --git a/1/main.c b/1/main.c
index 101f675..d441f19 100644
--- a/1/main.c
+++ b/1/main.c
@@ -53,7 +53,7 @@ static int mod_init(void) {
 		goto free_device;
 	}
 
-	printk("%s %d:%d\n", __PRETTY_FUNCTION__, MAJOR(node), MINOR(node));
+	printk("%s() -> 0 (%d:%d)\n", __PRETTY_FUNCTION__, MAJOR(node), MINOR(node));
 	return 0;
 
 free_device:
@@ -63,7 +63,7 @@ free_cdev:
 free_class:
 	class_destroy(class);
 return_err:
-	printk("%s: %d\n", __PRETTY_FUNCTION__, err);
+	printk("%s() -> %d\n", __PRETTY_FUNCTION__, err);
 	return err;
 }
 
@@ -71,7 +71,7 @@ static void mod_exit(void) {
 	device_destroy(class, node);
 	cdev_del(cdev);
 	class_destroy(class);
-	printk("%s\n", __PRETTY_FUNCTION__);
+	printk("%s()\n", __PRETTY_FUNCTION__);
 }
 
 module_init(mod_init);
diff --git a/1/test/main.c b/1/test/main.c
index 7329e16..b87e56c 100644
--- a/1/test/main.c
+++ b/1/test/main.c
@@ -1,5 +1,8 @@
 #include <stdio.h>
 #include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
 
 int main(int argc, char** argv) {
 	if (geteuid() != 0) {
@@ -13,6 +16,41 @@ int main(int argc, char** argv) {
 		return 1;
 	}
 
+	char* dev = argv[1];
+	const char* input = "test";
+	int fd;
+	ssize_t bytes;
+
+	fd = open(dev, O_RDWR);
+	if (-1 == fd) {
+		fprintf(stderr, "open() failed with code %d\n", errno);
+		return 1;
+	}
+
+	bytes = write(fd, input, strlen(input));
+	if (-1 == bytes) {
+		fprintf(stderr, "write() failed with code %d\n", errno);
+		return 1;
+	}
+	fprintf(stderr, "input \"%s\" to %s (%ld bytes succesful)\n", input, dev, bytes);
+
+	char buf[80];
+	bytes = read(fd, buf, 80);
+	if (-1 == bytes) {
+		fprintf(stderr, "read() failed with code %d\n", errno);
+		return 1;
+	}
+	fprintf(stderr, "output from %s: (%ld bytes)\n", dev, bytes);
+	if (bytes > 0) {
+		if (bytes < 80) buf[bytes] = '\0'; // null terminate string for printf
+		printf("%s\n", buf);
+	}
+
+	if (-1 == close(fd)) {
+		fprintf(stderr, "close() failed with code %d\n", errno);
+		return 1;
+	}
+
 	return 0;
 }
 
diff --git a/1/test/test.sh b/1/test/test.sh
index 18263e6..7dba005 100755
--- a/1/test/test.sh
+++ b/1/test/test.sh
@@ -10,5 +10,15 @@ if [ $# -eq 0 ] ; then
 	exit 1
 fi
 
+DEV="$1"
+INPUT="test"
+
+echo "input \"$INPUT\" to $DEV" >&2
+echo "$INPUT" > "$DEV"
+echo "(EC $?)" >&2
+
+echo "output from $DEV:" >&2
+cat "$DEV"
+echo "(EC $?)" >&2
 
 exit 0
-- 
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