1 files changed, 13 insertions, 0 deletions
diff --git a/lib/libc/stdio/fileno_unlocked.c b/lib/libc/stdio/fileno_unlocked.c
new file mode 100644
index 00000000..a3490686
--- /dev/null
+++ b/lib/libc/stdio/fileno_unlocked.c
@@ -0,0 +1,13 @@
+#include <__stdio.h>
+#include <errno.h>
+#include <stdio.h>
+
+int fileno_unlocked(FILE *stream)
+{
+	if (stream->fd < 0) {
+		errno = EBADF;
+		return -1;
+	}
+
+	return stream->fd;
+}