Kernel+LibC+LibCore: Implement the unlinkat(2) syscall

1 files changed, 19 insertions, 2 deletions

diff --git a/Kernel/Syscalls/unlink.cpp b/Kernel/Syscalls/unlink.cpp
index 80c89518db..582b1bea58 100644
--- a/Kernel/Syscalls/unlink.cpp
+++ b/Kernel/Syscalls/unlink.cpp
@@ -10,12 +10,29 @@
 
 namespace Kernel {
 
-ErrorOr<FlatPtr> Process::sys$unlink(Userspace<char const*> user_path, size_t path_length)
+ErrorOr<FlatPtr> Process::sys$unlink(int dirfd, Userspace<char const*> user_path, size_t path_length, int flags)
 {
     VERIFY_NO_PROCESS_BIG_LOCK(this)
     TRY(require_promise(Pledge::cpath));
     auto path = TRY(get_syscall_path_argument(user_path, path_length));
-    TRY(VirtualFileSystem::the().unlink(path->view(), current_directory()));
+
+    if (flags & ~AT_REMOVEDIR)
+        return Error::from_errno(EINVAL);
+
+    RefPtr<Custody> base;
+    if (dirfd == AT_FDCWD) {
+        base = current_directory();
+    } else {
+        auto base_description = TRY(open_file_description(dirfd));
+        if (!base_description->custody())
+            return Error::from_errno(EINVAL);
+        base = base_description->custody();
+    }
+
+    if (flags & AT_REMOVEDIR)
+        TRY(VirtualFileSystem::the().rmdir(path->view(), *base));
+    else
+        TRY(VirtualFileSystem::the().unlink(path->view(), *base));
     return 0;
 }