From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001
From: Vladimir Azarov <avm@intermediate-node.net>
Date: Tue, 1 Oct 2024 15:47:05 +0200
Subject: Initial version

---
 src/unistd/isatty.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 src/unistd/isatty.c

(limited to 'src/unistd/isatty.c')

diff --git a/src/unistd/isatty.c b/src/unistd/isatty.c
new file mode 100644
index 0000000..75a9c18
--- /dev/null
+++ b/src/unistd/isatty.c
@@ -0,0 +1,13 @@
+#include <unistd.h>
+#include <errno.h>
+#include <sys/ioctl.h>
+#include "syscall.h"
+
+int isatty(int fd)
+{
+	struct winsize wsz;
+	unsigned long r = syscall(SYS_ioctl, fd, TIOCGWINSZ, &wsz);
+	if (r == 0) return 1;
+	if (errno != EBADF) errno = ENOTTY;
+	return 0;
+}
-- 
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