From 8fa2af9678b9e257a1dfb1e5111f35d22366f2c6 Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Fri, 22 Nov 2024 22:33:06 +0100
Subject: vfs: Add dup()

---
 kernel/fs/vfs.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'kernel/fs/vfs.c')

diff --git a/kernel/fs/vfs.c b/kernel/fs/vfs.c
index 9684a18..1f28f13 100644
--- a/kernel/fs/vfs.c
+++ b/kernel/fs/vfs.c
@@ -395,6 +395,19 @@ vfs_vm_object_t *vfs_get_vm_object(int fd, u64 length, u64 offset) {
   return r;
 }
 
+int vfs_dup(int fd) {
+  vfs_fd_t *ptr = get_vfs_fd(fd, NULL);
+  if (!ptr) {
+    return -EBADF;
+  }
+  int index;
+  if (!relist_add(&current_task->file_descriptors, ptr, &index)) {
+    return -EMFILE;
+  }
+  ptr->reference_count++;
+  return index;
+}
+
 int vfs_dup2(int org_fd, int new_fd) {
   if (org_fd == new_fd) {
     return -EINVAL;
-- 
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