From cdb1a868130a072a60ce8e23926bd66480926a9b Mon Sep 17 00:00:00 2001
From: iMoD1998 <16210252+iMoD1998@users.noreply.github.com>
Date: Mon, 9 Nov 2026 00:48:48 +0000
Subject: [PATCH] Fix fcntl64 EBADF

---
 qiling/os/posix/syscall/fcntl.py | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/qiling/os/posix/syscall/fcntl.py b/qiling/os/posix/syscall/fcntl.py
index 13d60701e..5268039a2 100644
--- a/qiling/os/posix/syscall/fcntl.py
+++ b/qiling/os/posix/syscall/fcntl.py
@@ -120,13 +120,10 @@ def ql_syscall_fcntl(ql: Qiling, fd: int, cmd: int, arg: int):
 
 
 def ql_syscall_fcntl64(ql: Qiling, fd: int, cmd: int, arg: int):
-    if fd not in range(NR_OPEN):
-        return -1
-
-    f = ql.os.fd[fd]
+    f = get_opened_fd(ql.os, fd)
 
     if f is None:
-        return -1
+        return -EBADF
 
     # https://linux.die.net/man/2/fcntl64
     if cmd == F_DUPFD: