Kernel+LibC: Use argument for TIOCGPGRP ioctl value

In preparation for modifying the Kernel IOCTL API to return KResult
instead of int, we need to fix this ioctl to an argument to receive
it's return value, instead of using the actual function return value.

1 files changed, 7 insertions, 2 deletions

diff --git a/Kernel/TTY/TTY.cpp b/Kernel/TTY/TTY.cpp
index a58b882b4e..c5a7802133 100644
--- a/Kernel/TTY/TTY.cpp
+++ b/Kernel/TTY/TTY.cpp
@@ -469,8 +469,13 @@ int TTY::ioctl(FileDescription&, unsigned request, Userspace<void*> arg)
     }
 #endif
     switch (request) {
-    case TIOCGPGRP:
-        return this->pgid().value();
+    case TIOCGPGRP: {
+        auto user_pgid = static_ptr_cast<pid_t*>(arg);
+        auto pgid = this->pgid().value();
+        if (!copy_to_user(user_pgid, &pgid))
+            return -EFAULT;
+        return 0;
+    }
     case TIOCSPGRP: {
         ProcessGroupID pgid = static_cast<pid_t>(arg.ptr());
         if (pgid <= 0)