1 files changed, 60 insertions, 0 deletions
diff --git a/arch/um/os-Linux/tty.c b/arch/um/os-Linux/tty.c
new file mode 100644
index 0000000000..f784db83e0
--- /dev/null
+++ b/arch/um/os-Linux/tty.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <kern_util.h>
+#include <os.h>
+
+struct grantpt_info {
+	int fd;
+	int res;
+	int err;
+};
+
+static void grantpt_cb(void *arg)
+{
+	struct grantpt_info *info = arg;
+
+	info->res = grantpt(info->fd);
+	info->err = errno;
+}
+
+int get_pty(void)
+{
+	struct grantpt_info info;
+	int fd, err;
+
+	fd = open("/dev/ptmx", O_RDWR);
+	if (fd < 0) {
+		err = -errno;
+		printk(UM_KERN_ERR "get_pty : Couldn't open /dev/ptmx - "
+		       "err = %d\n", errno);
+		return err;
+	}
+
+	info.fd = fd;
+	initial_thread_cb(grantpt_cb, &info);
+
+	if (info.res < 0) {
+		err = -info.err;
+		printk(UM_KERN_ERR "get_pty : Couldn't grant pty - "
+		       "errno = %d\n", -info.err);
+		goto out;
+	}
+
+	if (unlockpt(fd) < 0) {
+		err = -errno;
+		printk(UM_KERN_ERR "get_pty : Couldn't unlock pty - "
+		       "errno = %d\n", errno);
+		goto out;
+	}
+	return fd;
+out:
+	close(fd);
+	return err;
+}