1 files changed, 162 insertions, 0 deletions
diff --git a/arch/um/drivers/pty.c b/arch/um/drivers/pty.c
new file mode 100644
index 000000000000..ed84d01df6cc
--- /dev/null
+++ b/arch/um/drivers/pty.c
@@ -0,0 +1,162 @@
+/* 
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <termios.h>
+#include "chan_user.h"
+#include "user.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "os.h"
+
+struct pty_chan {
+	void (*announce)(char *dev_name, int dev);
+	int dev;
+	int raw;
+	struct termios tt;
+	char dev_name[sizeof("/dev/pts/0123456\0")];
+};
+
+static void *pty_chan_init(char *str, int device, struct chan_opts *opts)
+{
+	struct pty_chan *data;
+
+	data = um_kmalloc(sizeof(*data));
+	if(data == NULL) return(NULL);
+	*data = ((struct pty_chan) { .announce  	= opts->announce, 
+				     .dev  		= device,
+				     .raw  		= opts->raw });
+	return(data);
+}
+
+static int pts_open(int input, int output, int primary, void *d,
+		    char **dev_out)
+{
+	struct pty_chan *data = d;
+	char *dev;
+	int fd, err;
+
+	fd = get_pty();
+	if(fd < 0){
+		printk("open_pts : Failed to open pts\n");
+		return(-errno);
+	}
+	if(data->raw){
+		CATCH_EINTR(err = tcgetattr(fd, &data->tt));
+		if(err)
+			return(err);
+
+		err = raw(fd);
+		if(err)
+			return(err);
+	}
+
+	dev = ptsname(fd);
+	sprintf(data->dev_name, "%s", dev);
+	*dev_out = data->dev_name;
+	if (data->announce)
+		(*data->announce)(dev, data->dev);
+	return(fd);
+}
+
+static int getmaster(char *line)
+{
+	char *pty, *bank, *cp;
+	int master, err;
+
+	pty = &line[strlen("/dev/ptyp")];
+	for (bank = "pqrs"; *bank; bank++) {
+		line[strlen("/dev/pty")] = *bank;
+		*pty = '0';
+		if (os_stat_file(line, NULL) < 0)
+			break;
+		for (cp = "0123456789abcdef"; *cp; cp++) {
+			*pty = *cp;
+			master = os_open_file(line, of_rdwr(OPENFLAGS()), 0);
+			if (master >= 0) {
+				char *tp = &line[strlen("/dev/")];
+
+				/* verify slave side is usable */
+				*tp = 't';
+				err = os_access(line, OS_ACC_RW_OK);
+				*tp = 'p';
+				if(err == 0) return(master);
+				(void) os_close_file(master);
+			}
+		}
+	}
+	return(-1);
+}
+
+static int pty_open(int input, int output, int primary, void *d,
+		    char **dev_out)
+{
+	struct pty_chan *data = d;
+	int fd, err;
+	char dev[sizeof("/dev/ptyxx\0")] = "/dev/ptyxx";
+
+	fd = getmaster(dev);
+	if(fd < 0)
+		return(-errno);
+
+	if(data->raw){
+		err = raw(fd);
+		if(err)
+			return(err);
+	}
+	
+	if(data->announce) (*data->announce)(dev, data->dev);
+
+	sprintf(data->dev_name, "%s", dev);
+	*dev_out = data->dev_name;
+	return(fd);
+}
+
+static int pty_console_write(int fd, const char *buf, int n, void *d)
+{
+	struct pty_chan *data = d;
+
+	return(generic_console_write(fd, buf, n, &data->tt));
+}
+
+struct chan_ops pty_ops = {
+	.type		= "pty",
+	.init		= pty_chan_init,
+	.open		= pty_open,
+	.close		= generic_close,
+	.read		= generic_read,
+	.write		= generic_write,
+	.console_write	= pty_console_write,
+	.window_size	= generic_window_size,
+	.free		= generic_free,
+	.winch		= 0,
+};
+
+struct chan_ops pts_ops = {
+	.type		= "pts",
+	.init		= pty_chan_init,
+	.open		= pts_open,
+	.close		= generic_close,
+	.read		= generic_read,
+	.write		= generic_write,
+	.console_write	= pty_console_write,
+	.window_size	= generic_window_size,
+	.free		= generic_free,
+	.winch		= 0,
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */