From 1d957dab035cd9e5ebb26e61ece74e05c586295c Mon Sep 17 00:00:00 2001
From: Matheus <matheusuky@gmail.com>
Date: Sat, 4 Oct 2025 21:48:23 -0300
Subject: [PATCH] fcntl: handle F_DUPFD_CLOEXEC

---
 kernel-src/sys/syscalls/fcntl.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel-src/sys/syscalls/fcntl.c b/kernel-src/sys/syscalls/fcntl.c
index fd7faab4..d955a4a9 100644
--- a/kernel-src/sys/syscalls/fcntl.c
+++ b/kernel-src/sys/syscalls/fcntl.c
@@ -11,6 +11,7 @@
 #define F_SETFL  4
 #define F_SETLK64 6
 #define F_SETLKW64 7
+#define F_DUPFD_CLOEXEC 1030
 
 #define FD_CLOEXEC 1
 
@@ -26,10 +27,11 @@ syscallret_t syscall_fcntl(context_t *, int fd, int cmd, uint64_t arg) {
 	}
 
 	switch (cmd) {
+		case F_DUPFD_CLOEXEC:
 		case F_DUPFD:
 			{
 			int f;
-			ret.errno = fd_dup(fd, arg, false, 0, &f);
+			ret.errno = fd_dup(fd, arg, false, (cmd == F_DUPFD_CLOEXEC) ? O_CLOEXEC : 0, &f);
 			ret.ret = f;
 			}
 			break;