linux/arch/um/drivers/tty.c
Jeff Dike e99525f970 uml: console subsystem tidying
This does a lot of cleanup on the UML console system.  This patch should be
entirely non-functional.

The tidying is as follows:
	header cleanups - the includes should be closer to minimal and complete
	all printks now have a severity
	lots of style fixes
	fd_close is restructured a little in order to reduce the nesting
	some functions were calling the os_* wrappers when they can
call libc directly
	port_accept had a unnecessary variable
	it also tested a pid unecessarily before killing it
	some functions were made static
	xterm_free is gone, as it was identical to generic_free

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 09:43:04 -07:00

84 lines
1.5 KiB
C

/*
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
* Licensed under the GPL
*/
#include <errno.h>
#include <fcntl.h>
#include <termios.h>
#include "chan_user.h"
#include "kern_constants.h"
#include "os.h"
#include "um_malloc.h"
#include "user.h"
struct tty_chan {
char *dev;
int raw;
struct termios tt;
};
static void *tty_chan_init(char *str, int device, const struct chan_opts *opts)
{
struct tty_chan *data;
if (*str != ':') {
printk(UM_KERN_ERR "tty_init : channel type 'tty' must specify "
"a device\n");
return NULL;
}
str++;
data = kmalloc(sizeof(*data), UM_GFP_KERNEL);
if (data == NULL)
return NULL;
*data = ((struct tty_chan) { .dev = str,
.raw = opts->raw });
return data;
}
static int tty_open(int input, int output, int primary, void *d,
char **dev_out)
{
struct tty_chan *data = d;
int fd, err, mode = 0;
if (input && output)
mode = O_RDWR;
else if (input)
mode = O_RDONLY;
else if (output)
mode = O_WRONLY;
fd = open(data->dev, mode);
if (fd < 0)
return -errno;
if (data->raw) {
CATCH_EINTR(err = tcgetattr(fd, &data->tt));
if (err)
return err;
err = raw(fd);
if (err)
return err;
}
*dev_out = data->dev;
return fd;
}
const struct chan_ops tty_ops = {
.type = "tty",
.init = tty_chan_init,
.open = tty_open,
.close = generic_close,
.read = generic_read,
.write = generic_write,
.console_write = generic_console_write,
.window_size = generic_window_size,
.free = generic_free,
.winch = 0,
};