Kernel: Add isatty syscall

1 files changed, 12 insertions, 0 deletions

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;
+}