2 files changed, 48 insertions, 0 deletions
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