tty.c (1508B)
1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com) 4 */ 5 6#include <errno.h> 7#include <fcntl.h> 8#include <termios.h> 9#include "chan_user.h" 10#include <os.h> 11#include <um_malloc.h> 12 13struct tty_chan { 14 char *dev; 15 int raw; 16 struct termios tt; 17}; 18 19static void *tty_chan_init(char *str, int device, const struct chan_opts *opts) 20{ 21 struct tty_chan *data; 22 23 if (*str != ':') { 24 printk(UM_KERN_ERR "tty_init : channel type 'tty' must specify " 25 "a device\n"); 26 return NULL; 27 } 28 str++; 29 30 data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL); 31 if (data == NULL) 32 return NULL; 33 *data = ((struct tty_chan) { .dev = str, 34 .raw = opts->raw }); 35 36 return data; 37} 38 39static int tty_open(int input, int output, int primary, void *d, 40 char **dev_out) 41{ 42 struct tty_chan *data = d; 43 int fd, err, mode = 0; 44 45 if (input && output) 46 mode = O_RDWR; 47 else if (input) 48 mode = O_RDONLY; 49 else if (output) 50 mode = O_WRONLY; 51 52 fd = open(data->dev, mode); 53 if (fd < 0) 54 return -errno; 55 56 if (data->raw) { 57 CATCH_EINTR(err = tcgetattr(fd, &data->tt)); 58 if (err) 59 return err; 60 61 err = raw(fd); 62 if (err) 63 return err; 64 } 65 66 *dev_out = data->dev; 67 return fd; 68} 69 70const struct chan_ops tty_ops = { 71 .type = "tty", 72 .init = tty_chan_init, 73 .open = tty_open, 74 .close = generic_close, 75 .read = generic_read, 76 .write = generic_write, 77 .console_write = generic_console_write, 78 .window_size = generic_window_size, 79 .free = generic_free, 80 .winch = 0, 81};