feat: (device) dev_null and dev_rand support

[lunaix-os.git] / lunaix-os / kernel / device / builtin / devnull.c

diff --git a/lunaix-os/kernel/device/builtin/devnull.c b/lunaix-os/kernel/device/builtin/devnull.c
new file mode 100644 (file)
index 0000000..977c385
--- /dev/null
+++ b/lunaix-os/kernel/device/builtin/devnull.c
@@ -0,0 +1,39 @@
+#include <lunaix/device.h>
+
+int
+__null_wr_pg(struct device* dev, void* buf, size_t offset)
+{
+    // do nothing
+    return PG_SIZE;
+}
+
+int
+__null_wr(struct device* dev, void* buf, size_t offset, size_t len)
+{
+    // do nothing
+    return len;
+}
+
+int
+__null_rd_pg(struct device* dev, void* buf, size_t offset)
+{
+    // do nothing
+    return 0;
+}
+
+int
+__null_rd(struct device* dev, void* buf, size_t offset, size_t len)
+{
+    // do nothing
+    return 0;
+}
+
+void
+devbuiltin_init_null()
+{
+    struct device* devnull = device_addseq(NULL, NULL, "null");
+    devnull->write_page = __null_wr_pg;
+    devnull->write = __null_wr;
+    devnull->read_page = __null_rd_pg;
+    devnull->read = __null_rd;
+}
\ No newline at end of file