1 files changed, 108 insertions, 0 deletions
diff --git a/arch/um/drivers/fd.c b/arch/um/drivers/fd.c
new file mode 100644
index 000000000000..f0b888f66e05
--- /dev/null
+++ b/arch/um/drivers/fd.c
@@ -0,0 +1,108 @@
+/* 
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <termios.h>
+#include <errno.h>
+#include "user.h"
+#include "user_util.h"
+#include "chan_user.h"
+
+struct fd_chan {
+	int fd;
+	int raw;
+	struct termios tt;
+	char str[sizeof("1234567890\0")];
+};
+
+static void *fd_init(char *str, int device, struct chan_opts *opts)
+{
+	struct fd_chan *data;
+	char *end;
+	int n;
+
+	if(*str != ':'){
+		printk("fd_init : channel type 'fd' must specify a file "
+		       "descriptor\n");
+		return(NULL);
+	}
+	str++;
+	n = strtoul(str, &end, 0);
+	if((*end != '\0') || (end == str)){
+		printk("fd_init : couldn't parse file descriptor '%s'\n", str);
+		return(NULL);
+	}
+	data = um_kmalloc(sizeof(*data));
+	if(data == NULL) return(NULL);
+	*data = ((struct fd_chan) { .fd  	= n,
+				    .raw  	= opts->raw });
+	return(data);
+}
+
+static int fd_open(int input, int output, int primary, void *d, char **dev_out)
+{
+	struct fd_chan *data = d;
+	int err;
+
+	if(data->raw && isatty(data->fd)){
+		CATCH_EINTR(err = tcgetattr(data->fd, &data->tt));
+		if(err)
+			return(err);
+
+		err = raw(data->fd);
+		if(err)
+			return(err);
+	}
+	sprintf(data->str, "%d", data->fd);
+	*dev_out = data->str;
+	return(data->fd);
+}
+
+static void fd_close(int fd, void *d)
+{
+	struct fd_chan *data = d;
+	int err;
+
+	if(data->raw && isatty(fd)){
+		CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &data->tt));
+		if(err)
+			printk("Failed to restore terminal state - "
+			       "errno = %d\n", -err);
+		data->raw = 0;
+	}
+}
+
+static int fd_console_write(int fd, const char *buf, int n, void *d)
+{
+	struct fd_chan *data = d;
+
+	return(generic_console_write(fd, buf, n, &data->tt));
+}
+
+struct chan_ops fd_ops = {
+	.type		= "fd",
+	.init		= fd_init,
+	.open		= fd_open,
+	.close		= fd_close,
+	.read		= generic_read,
+	.write		= generic_write,
+	.console_write	= fd_console_write,
+	.window_size	= generic_window_size,
+	.free		= generic_free,
+	.winch		= 1,
+};
+
+/*
+ * 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:
+ */