96 lines
1.9 KiB
C
96 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <termios.h>
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#include "chan_user.h"
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#include <os.h>
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#include <um_malloc.h>
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struct fd_chan {
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int fd;
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int raw;
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struct termios tt;
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char str[sizeof("1234567890\0")];
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};
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static void *fd_init(char *str, int device, const struct chan_opts *opts)
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{
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struct fd_chan *data;
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char *end;
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int n;
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if (*str != ':') {
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printk(UM_KERN_ERR "fd_init : channel type 'fd' must specify a "
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"file descriptor\n");
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return NULL;
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}
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str++;
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n = strtoul(str, &end, 0);
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if ((*end != '\0') || (end == str)) {
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printk(UM_KERN_ERR "fd_init : couldn't parse file descriptor "
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"'%s'\n", str);
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return NULL;
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}
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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 fd_chan) { .fd = n,
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.raw = opts->raw });
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return data;
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}
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static int fd_open(int input, int output, int primary, void *d, char **dev_out)
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{
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struct fd_chan *data = d;
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int err;
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if (data->raw && isatty(data->fd)) {
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CATCH_EINTR(err = tcgetattr(data->fd, &data->tt));
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if (err)
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return err;
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err = raw(data->fd);
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if (err)
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return err;
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}
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sprintf(data->str, "%d", data->fd);
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*dev_out = data->str;
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return data->fd;
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}
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static void fd_close(int fd, void *d)
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{
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struct fd_chan *data = d;
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int err;
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if (!data->raw || !isatty(fd))
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return;
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CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &data->tt));
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if (err)
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printk(UM_KERN_ERR "Failed to restore terminal state - "
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"errno = %d\n", -err);
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data->raw = 0;
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}
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const struct chan_ops fd_ops = {
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.type = "fd",
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.init = fd_init,
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.open = fd_open,
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.close = fd_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 = 1,
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};
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