From a193516bbf3e6e306817ec7e04e3c34885bbc4e1 Mon Sep 17 00:00:00 2001
From: Matheus <matheusuky@gmail.com>
Date: Mon, 26 Jun 2023 23:19:01 -0300
Subject: [PATCH] syscalls: fcntl

---
 kernel-src/sys/syscalls/fcntl.c | 55 +++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 kernel-src/sys/syscalls/fcntl.c

diff --git a/kernel-src/sys/syscalls/fcntl.c b/kernel-src/sys/syscalls/fcntl.c
new file mode 100644
index 00000000..373d30b7
--- /dev/null
+++ b/kernel-src/sys/syscalls/fcntl.c
@@ -0,0 +1,55 @@
+#include <kernel/syscalls.h>
+#include <errno.h>
+#include <kernel/scheduler.h>
+#include <kernel/file.h>
+#include <kernel/abi.h>
+
+#define F_DUPFD  0
+#define F_GETFD  1
+#define F_SETFD  2
+#define F_GETFL  3
+#define F_SETFL  4
+
+syscallret_t syscall_fcntl(context_t *, int fd, int cmd, uint64_t arg) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+	
+	file_t *file = fd_get(fd);
+	if (file == NULL) {
+		ret.errno = EBADF;
+		return ret;
+	}
+
+	switch (cmd) {
+		case F_DUPFD:
+			{
+			int f;
+			ret.errno = fd_dup(fd, arg, false, 0, &f);
+			ret.ret = f;
+			}
+			break;
+		case F_GETFL:
+			ret.ret = file->flags;
+			break;
+		case F_SETFL:
+			arg &= ~(O_RDONLY | O_WRONLY | O_RDWR | O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);	
+			file->flags &= ~(O_APPEND | O_ASYNC | O_NOATIME | O_NONBLOCK);
+			file->flags |= arg;
+			ret.ret = 0;
+			break;
+		case F_SETFD:
+		case F_GETFD: // TODO implement this
+			ret.ret = 0;
+			break;
+		default:
+			ret.errno = EINVAL;
+			break;
+	}
+
+	if (file)
+		fd_release(file);
+
+	ret.errno = 0;
+	return ret;
+}