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/* current-vcs.c -- Add a "current vcs" symlink to the cons node.
Copyright (C) 2005 Free Software Foundation, Inc.
Written by Samuel Thibault.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <argp.h>
#include <driver.h>
#include <input.h>
#include <stdio.h>
#include <error.h>
#include <sys/mman.h>
#include "trans.h"
/* We use the same infrastructure as the kbd and mouse repeaters. */
/* The default name of the node of the repeater. */
#define DEFAULT_REPEATER_NODE "vcs"
/* The name of the repeater node. */
static char *repeater_node = DEFAULT_REPEATER_NODE;
/* The repeater node. */
static consnode_t vcs_node;
/* Callbacks for vcs console node. */
/* Reading the link to get current vcs, returns length of path (trailing \0
excluded). */
static error_t
vcs_readlink (struct iouser *user, struct node *np, char *buf)
{
int cur;
error_t ret = 0;
ret = console_current_id (&cur);
if (!ret)
{
if (!buf)
ret = snprintf (NULL, 0, "%s/%d", cons_file, cur);
else
ret = sprintf (buf, "%s/%d", cons_file, cur);
if (ret < 0)
ret = -errno;
}
else
ret = -ret;
return ret;
}
static error_t
vcs_read (struct protid *user, char **data,
mach_msg_type_number_t * datalen, off_t offset,
mach_msg_type_number_t amount)
{
int err;
int size;
char *buf;
if (amount > 0)
{
size = vcs_readlink (user->user, NULL, NULL);
if (size < 0)
return -size;
buf = alloca (size);
err = vcs_readlink (user->user, NULL, buf);
if (err < 0)
return -err;
if (offset + amount > size)
amount = size - offset;
if (amount < 0)
amount = 0;
if (*datalen < amount)
{
*data = mmap (0, amount, PROT_READ | PROT_WRITE, MAP_ANON, 0, 0);
if (*data == MAP_FAILED)
return ENOMEM;
}
memcpy (*data, buf + offset, amount);
*datalen = amount;
}
return 0;
}
/* Making a link to set current vcs.
Relative values perform relative switches. */
static error_t
vcs_mksymlink (struct iouser *user, struct node *np, char *name)
{
char *c, *d;
int vt, delta = 0;
c = strrchr (name, '/');
if (!c)
c = name;
else
c++;
if (!*c)
return EINVAL;
if (*c == '-' || *c == '+')
delta = 1;
vt = strtol (c, &d, 10);
if (*d)
/* Bad number. */
return EINVAL;
if (!vt)
return 0;
return console_switch (delta ? 0 : vt, delta ? vt : 0);
}
static const char doc[] = "Current VCS Driver";
static const struct argp_option options[] =
{
{ "repeater", 'r', "NODE", OPTION_ARG_OPTIONAL,
"Set a current vcs translator on NODE (default: " DEFAULT_REPEATER_NODE ")"},
{ 0 }
};
static error_t
parse_opt (int key, char *arg, struct argp_state *state)
{
int *pos = (int *) state->input;
switch (key)
{
case 'r':
repeater_node = arg ? arg: DEFAULT_REPEATER_NODE;
break;
case ARGP_KEY_END:
break;
default:
return ARGP_ERR_UNKNOWN;
}
*pos = state->next;
return 0;
}
static struct argp argp = {options, parse_opt, 0, doc};
/* Initialize the current VCS driver. */
static error_t
current_vcs_init (void **handle, int no_exit, int argc, char *argv[], int *next)
{
error_t err;
int pos = 1;
/* Parse the arguments. */
err = argp_parse (&argp, argc, argv, ARGP_IN_ORDER | ARGP_NO_EXIT
| ARGP_SILENT, 0, &pos);
*next += pos - 1;
if (err && err != EINVAL)
return err;
return 0;
}
static error_t
current_vcs_start (void *handle)
{
error_t err;
err = console_create_consnode (repeater_node, &vcs_node);
if (err)
return err;
vcs_node->read = vcs_read;
vcs_node->write = NULL;
vcs_node->select = NULL;
vcs_node->open = NULL;
vcs_node->close = NULL;
vcs_node->demuxer = NULL;
vcs_node->readlink = vcs_readlink;
vcs_node->mksymlink = vcs_mksymlink;
console_register_consnode (vcs_node);
return 0;
}
static error_t
current_vcs_fini (void *handle, int force)
{
console_unregister_consnode (vcs_node);
console_destroy_consnode (vcs_node);
return 0;
}
struct driver_ops driver_current_vcs_ops =
{
current_vcs_init,
current_vcs_start,
current_vcs_fini
};
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