arch/um/drivers/tty.c

   1 /*
   2  * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <stdio.h>
   7 #include <termios.h>
   8 #include <errno.h>
   9 #include <unistd.h>
  10 #include "chan_user.h"
  11 #include "user.h"
  12 #include "os.h"
  13 #include "um_malloc.h"
  14
  15 struct tty_chan {
  16         char *dev;
  17         int raw;
  18         struct termios tt;
  19 };
  20
  21 static void *tty_chan_init(char *str, int device, const struct chan_opts *opts)
  22 {
  23         struct tty_chan *data;
  24
  25         if(*str != ':'){
  26                 printk("tty_init : channel type 'tty' must specify "
  27                        "a device\n");
  28                 return NULL;
  29         }
  30         str++;
  31
  32         data = um_kmalloc(sizeof(*data));
  33         if(data == NULL)
  34                 return NULL;
  35         *data = ((struct tty_chan) { .dev       = str,
  36                                      .raw       = opts->raw });
  37
  38         return data;
  39 }
  40
  41 static int tty_open(int input, int output, int primary, void *d,
  42                     char **dev_out)
  43 {
  44         struct tty_chan *data = d;
  45         int fd, err;
  46
  47         fd = os_open_file(data->dev, of_set_rw(OPENFLAGS(), input, output), 0);
  48         if(fd < 0)
  49                 return fd;
  50
  51         if(data->raw){
  52                 CATCH_EINTR(err = tcgetattr(fd, &data->tt));
  53                 if(err)
  54                         return err;
  55
  56                 err = raw(fd);
  57                 if(err)
  58                         return err;
  59         }
  60
  61         *dev_out = data->dev;
  62         return fd;
  63 }
  64
  65 const struct chan_ops tty_ops = {
  66         .type           = "tty",
  67         .init           = tty_chan_init,
  68         .open           = tty_open,
  69         .close          = generic_close,
  70         .read           = generic_read,
  71         .write          = generic_write,
  72         .console_write  = generic_console_write,
  73         .window_size    = generic_window_size,
  74         .free           = generic_free,
  75         .winch          = 0,
  76 };