From 99e5c8e046dfff53c331eb35394bfbcab4629fd0 Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Fri, 17 Nov 2023 21:24:33 +0100
Subject: Kernel: Add isatty syscall

---
 kernel/syscalls/isatty.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 kernel/syscalls/isatty.c

(limited to 'kernel/syscalls/isatty.c')

diff --git a/kernel/syscalls/isatty.c b/kernel/syscalls/isatty.c
new file mode 100644
index 0000000..64649e2
--- /dev/null
+++ b/kernel/syscalls/isatty.c
@@ -0,0 +1,12 @@
+#include <fs/vfs.h>
+#include <syscalls.h>
+#include <errno.h>
+
+int syscall_isatty(int fd) {
+  vfs_fd_t *fd_ptr = get_vfs_fd(fd);
+  if (!fd_ptr)
+    return -EBADF;
+  if (!fd_ptr->is_tty)
+    return -ENOTTY;
+  return 1;
+}
-- 
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