From 0c9282bb61b0d7c463045139655b3f1f1ec5422b Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Fri, 17 Nov 2023 21:28:16 +0100
Subject: LibC: Add isatty()

---
 userland/libc/unistd/isatty.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 userland/libc/unistd/isatty.c

(limited to 'userland/libc/unistd/isatty.c')

diff --git a/userland/libc/unistd/isatty.c b/userland/libc/unistd/isatty.c
new file mode 100644
index 0000000..d8b08c3
--- /dev/null
+++ b/userland/libc/unistd/isatty.c
@@ -0,0 +1,11 @@
+#include <syscall.h>
+#include <unistd.h>
+#include <errno.h>
+
+int isatty(int fd) {
+  int rc = syscall(SYS_ISATTY, fd, 0, 0, 0, 0);
+  if (1 == rc)
+    return rc;
+  errno = -rc;
+  return 0;
+}
-- 
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