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_util.h"
  12 #include "user.h"
  13 #include "os.h"
  14 #include "um_malloc.h"
  15
  16 struct tty_chan {
  17         char *dev;
  18         int raw;
  19         struct termios tt;
  20 };
  21
  22 static void *tty_chan_init(char *str, int device, const struct chan_opts *opts)
  23 {
  24         struct tty_chan *data;
  25
  26         if(*str != ':'){
  27                 printk("tty_init : channel type 'tty' must specify "
  28                        "a device\n");
  29                 return NULL;
  30         }
  31         str++;
  32
  33         data = um_kmalloc(sizeof(*data));
  34         if(data == NULL)
  35                 return NULL;
  36         *data = ((struct tty_chan) { .dev       = str,
  37                                      .raw       = opts->raw });
  38
  39         return data;
  40 }
  41
  42 static int tty_open(int input, int output, int primary, void *d,
  43                     char **dev_out)
  44 {
  45         struct tty_chan *data = d;
  46         int fd, err;
  47
  48         fd = os_open_file(data->dev, of_set_rw(OPENFLAGS(), input, output), 0);
  49         if(fd < 0)
  50                 return fd;
  51
  52         if(data->raw){
  53                 CATCH_EINTR(err = tcgetattr(fd, &data->tt));
  54                 if(err)
  55                         return err;
  56
  57                 err = raw(fd);
  58                 if(err)
  59                         return err;
  60         }
  61
  62         *dev_out = data->dev;
  63         return fd;
  64 }
  65
  66 const struct chan_ops tty_ops = {
  67         .type           = "tty",
  68         .init           = tty_chan_init,
  69         .open           = tty_open,
  70         .close          = generic_close,
  71         .read           = generic_read,
  72         .write          = generic_write,
  73         .console_write  = generic_console_write,
  74         .window_size    = generic_window_size,
  75         .free           = generic_free,
  76         .winch          = 0,
  77 };