lib/common.c
author Florian Pose <fp@igh-essen.com>
Thu, 09 Oct 2008 14:35:08 +0000
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parent 1244 0b70040d3daa
child 1258 900f1124e8f8
permissions -rw-r--r--
Warning.
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/******************************************************************************
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 *
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 *  $Id$
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 *
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 *  Copyright (C) 2006  Florian Pose, Ingenieurgemeinschaft IgH
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 *
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 *  This file is part of the IgH EtherCAT Master.
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 *
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 *  The IgH EtherCAT Master is free software; you can redistribute it
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 *  and/or modify it under the terms of the GNU General Public License
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 *  as published by the Free Software Foundation; either version 2 of the
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 *  License, or (at your option) any later version.
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 *
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 *  The IgH EtherCAT Master is distributed in the hope that it will be
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 *  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with the IgH EtherCAT Master; if not, write to the Free Software
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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 *
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 *  The right to use EtherCAT Technology is granted and comes free of
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 *  charge under condition of compatibility of product made by
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 *  Licensee. People intending to distribute/sell products based on the
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 *  code, have to sign an agreement to guarantee that products using
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 *  software based on IgH EtherCAT master stay compatible with the actual
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 *  EtherCAT specification (which are released themselves as an open
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 *  standard) as the (only) precondition to have the right to use EtherCAT
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 *  Technology, IP and trade marks.
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 *
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 *****************************************************************************/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include "master.h"
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#include "master/ioctl.h"
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/*****************************************************************************/
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unsigned int ecrt_version_magic(void)
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{
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    return ECRT_VERSION_MAGIC;
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}
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/*****************************************************************************/
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#define MAX_PATH_LEN 64
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ec_master_t *ecrt_request_master(unsigned int master_index)
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{
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    char path[MAX_PATH_LEN];
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    ec_master_t *master;
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    master = malloc(sizeof(ec_master_t));
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    if (!master) {
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        fprintf(stderr, "Failed to allocate memory.\n");
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        return 0;
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    }
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    snprintf(path, MAX_PATH_LEN - 1, "/dev/EtherCAT%u", master_index);
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    master->fd = open(path, O_RDWR);
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    if (master->fd == -1) {
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        fprintf(stderr, "Failed to open %s: %s\n", path, strerror(errno));
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        free(master);
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        return 0;
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    }
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    if (ioctl(master->fd, EC_IOCTL_REQUEST, NULL) == -1) {
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        fprintf(stderr, "Failed to request master %u: %s\n",
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                master_index, strerror(errno));
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        close(master->fd);
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        free(master);
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        return 0; 
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    }
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    return master;
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}
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/*****************************************************************************/
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void ecrt_release_master(ec_master_t *master)
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{
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    close(master->fd);
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    free(master);
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}
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/*****************************************************************************/