1 files changed, 68 insertions, 0 deletions
diff --git a/kernel/kernel/main.cpp b/kernel/kernel/main.cpp
index dc57fb55..13697eb6 100644
--- a/kernel/kernel/main.cpp
+++ b/kernel/kernel/main.cpp
@@ -1,4 +1,5 @@
 #include "kernel/filesystem/type_registry.hpp"
+#include <kernel/devices/init.hpp>
 #include <kernel/devices/storage.hpp>
 #include <kernel/drivers/init.hpp>
 #include <kernel/filesystem/open_file_table.hpp>
@@ -141,6 +142,70 @@ auto run_demo() -> void
 
   // 14) dmp the module after create new directory and file
   // -exec monitor memsave 0xffffffff8025b000 0xA00000 dump_after.bin
+
+  // 15) read from /dev/null
+  auto fd_5 = kapi::filesystem::open("/dev/null");
+  if (fd_5)
+  {
+    kstd::println("--> successfully opened /dev/null as a file with file descriptor {}", fd_5.value());
+  }
+  else
+  {
+    kapi::system::panic("demo failed");
+  }
+
+  auto buffer_4 = kstd::vector<std::byte>{10, std::byte{0xff}};
+  if (auto read = kapi::filesystem::read(fd_5.value(), buffer_4); !read)
+  {
+    kapi::system::panic("demo failed: {}", read.error());
+  }
+  else
+  {
+    bytes_read = read->value;
+  }
+  kstd::println("--> read {} bytes from /dev/null", bytes_read);
+
+  if (auto written = kapi::filesystem::write(fd_5.value(), buffer_4); !written)
+  {
+    kapi::system::panic("demo failed: {}", written.error());
+  }
+  else
+  {
+    bytes_written = written->value;
+  }
+  kstd::println("--> written {} bytes to /dev/null", bytes_written);
+
+  // 16) read from /dev/null
+  auto fd_6 = kapi::filesystem::open("/dev/zero");
+  if (fd_6)
+  {
+    kstd::println("--> successfully opened /dev/zero as a file with file descriptor {}", fd_6.value());
+  }
+  else
+  {
+    kapi::system::panic("demo failed");
+  }
+
+  auto buffer_5 = kstd::vector<std::byte>{10, std::byte{0xff}};
+  if (auto read = kapi::filesystem::read(fd_6.value(), buffer_5); !read)
+  {
+    kapi::system::panic("demo failed: {}", read.error());
+  }
+  else
+  {
+    bytes_read = read->value;
+  }
+  kstd::println("--> read {} bytes from /dev/zero: {::#04x}", bytes_read, buffer_5);
+
+  if (auto written = kapi::filesystem::write(fd_6.value(), buffer_5); !written)
+  {
+    kapi::system::panic("demo failed: {}", written.error());
+  }
+  else
+  {
+    bytes_written = written->value;
+  }
+  kstd::println("--> written {} bytes to /dev/zero", bytes_written);
 }
 
 auto main() -> int
@@ -162,6 +227,9 @@ auto main() -> int
   kernel::drivers::init();
   kstd::println("[OS] Generic drivers initialized.");
 
+  kernel::devices::init();
+  kstd::println("[OS] Generic devices initialized.");
+
   kapi::devices::init_platform_drivers();
   kstd::println("[OS] Platform drivers initialized.");