Kernel+LibC: Turn errno codes into a strongly typed enum

..and allow implicit creation of KResult and KResultOr from ErrnoCode.
This means that kernel functions that return those types can finally
do "return EINVAL;" and it will just work.

There's a handful of functions that still deal with signed integers
that should be converted to return KResults.

1 files changed, 2 insertions, 2 deletions

diff --git a/Kernel/Syscalls/waitid.cpp b/Kernel/Syscalls/waitid.cpp
index 6a7953ca4e..ea6fb3248a 100644
--- a/Kernel/Syscalls/waitid.cpp
+++ b/Kernel/Syscalls/waitid.cpp
@@ -38,12 +38,12 @@ KResultOr<siginfo_t> Process::do_waitid(idtype_t idtype, int id, int options)
     case P_PGID:
         break;
     default:
-        return KResult(-EINVAL);
+        return EINVAL;
     }
 
     KResultOr<siginfo_t> result = KResult(KSuccess);
     if (Thread::current()->block<Thread::WaitBlocker>({}, options, idtype, id, result).was_interrupted())
-        return KResult(-EINTR);
+        return EINTR;
     ASSERT(!result.is_error() || (options & WNOHANG) || result.error() != KSuccess);
     return result;
 }