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