1 files changed, 56 insertions, 0 deletions
diff --git a/driver/test/main.c b/driver/test/main.c
new file mode 100644
index 0000000..b87e56c
--- /dev/null
+++ b/driver/test/main.c
@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+
+int main(int argc, char** argv) {
+	if (geteuid() != 0) {
+		fprintf(stderr, "run me as root!\n");
+		return 1;
+	}
+
+	argc--; // argv[0] is the program name
+	if (argc == 0) {
+		fprintf(stderr, "usage: %s /dev/lork\n", argv[0]);
+		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;
+}
+