Base files for new TTY driver.
/******************************************************************************
*
* $Id$
*
* Copyright (C) 2006-2009 Florian Pose, Ingenieurgemeinschaft IgH
*
* This file is part of the IgH EtherCAT master userspace library.
*
* The IgH EtherCAT master userspace library is free software; you can
* redistribute it and/or modify it under the terms of the GNU Lesser General
* Public License as published by the Free Software Foundation; version 2.1
* of the License.
*
* The IgH EtherCAT master userspace library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the IgH EtherCAT master userspace library. If not, see
* <http://www.gnu.org/licenses/>.
*
* ---
*
* The license mentioned above concerns the source code only. Using the
* EtherCAT technology and brand is only permitted in compliance with the
* industrial property and similar rights of Beckhoff Automation GmbH.
*
*****************************************************************************/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include "master.h"
#include "master/ioctl.h"
/*****************************************************************************/
unsigned int ecrt_version_magic(void)
{
return ECRT_VERSION_MAGIC;
}
/*****************************************************************************/
ec_master_t *ecrt_request_master(unsigned int master_index)
{
ec_master_t *master = ecrt_open_master(master_index);
if (master) {
if (ecrt_master_reserve(master) < 0) {
close(master->fd);
free(master);
master = 0;
}
}
return master;
}
/*****************************************************************************/
#define MAX_PATH_LEN 64
ec_master_t *ecrt_open_master(unsigned int master_index)
{
char path[MAX_PATH_LEN];
ec_master_t *master;
master = malloc(sizeof(ec_master_t));
if (!master) {
fprintf(stderr, "Failed to allocate memory.\n");
return 0;
}
master->process_data = NULL;
master->process_data_size = 0;
snprintf(path, MAX_PATH_LEN - 1, "/dev/EtherCAT%u", master_index);
master->fd = open(path, O_RDWR);
if (master->fd == -1) {
fprintf(stderr, "Failed to open %s: %s\n", path, strerror(errno));
free(master);
return 0;
}
return master;
}
/*****************************************************************************/
void ecrt_release_master(ec_master_t *master)
{
if (master->process_data) {
munmap(master->process_data, master->process_data_size);
}
close(master->fd);
free(master);
}
/*****************************************************************************/