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/*
* UVT - Userspace Virtual Terminals
*
* Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* Null TTY
* This tty simply discards all incoming messages and never produces any
* outgoing messages. Ioctls return static data or fail with some generic error
* code if they would modify internal state that we cannot emulate easily.
*/
#include <eloop.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "shl_llog.h"
#include "uvt.h"
#include "uvt_internal.h"
#define LLOG_SUBSYSTEM "uvt_tty_null"
struct uvt_tty_null {
unsigned long ref;
struct uvt_ctx *ctx;
llog_submit_t llog;
void *llog_data;
};
static void tty_null_ref(void *data)
{
uvt_tty_null_ref(data);
}
static void tty_null_unref(void *data)
{
uvt_tty_null_unref(data);
}
static int tty_null_register_cb(void *data, uvt_tty_cb cb, void *cb_data)
{
return 0;
}
static void tty_null_unregister_cb(void *data, uvt_tty_cb cb, void *cb_data)
{
}
static int tty_null_read(void *data, uint8_t *buf, size_t size)
{
return -EAGAIN;
}
static int tty_null_write(void *data, const uint8_t *buf, size_t size)
{
return size;
}
static unsigned int tty_null_poll(void *data)
{
return UVT_TTY_WRITE;
}
const struct uvt_tty_ops uvt_tty_null_ops = {
.ref = tty_null_ref,
.unref = tty_null_unref,
.register_cb = tty_null_register_cb,
.unregister_cb = tty_null_unregister_cb,
.read = tty_null_read,
.write = tty_null_write,
.poll = tty_null_poll,
};
int uvt_tty_null_new(struct uvt_tty_null **out, struct uvt_ctx *ctx)
{
struct uvt_tty_null *tty;
if (!ctx)
return -EINVAL;
if (!out)
return llog_EINVAL(ctx);
tty = malloc(sizeof(*tty));
if (!tty)
return llog_ENOMEM(ctx);
memset(tty, 0, sizeof(*tty));
tty->ref = 1;
tty->ctx = ctx;
tty->llog = tty->ctx->llog;
tty->llog_data = tty->ctx->llog_data;
uvt_ctx_ref(tty->ctx);
*out = tty;
return 0;
}
void uvt_tty_null_ref(struct uvt_tty_null *tty)
{
if (!tty || !tty->ref)
return;
++tty->ref;
}
void uvt_tty_null_unref(struct uvt_tty_null *tty)
{
if (!tty || !tty->ref || --tty->ref)
return;
uvt_ctx_unref(tty->ctx);
free(tty);
}
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