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/* $Id$ */
/***
This file is part of ivam2.
ivam2 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 of the License, or
(at your option) any later version.
ivam2 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 ivam2; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stddef.h>
#include <assert.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <libdaemon/dlog.h>
#include "modemman.h"
#include "modem.h"
#define MAX_CHANNELS 10
#define TTY_START 12
struct llist {
struct modem *modem;
struct llist *next;
};
static struct llist *llist = NULL;
static int n_llist = 0;
static void modem_try_open(const char *dev) {
struct modem *m;
if ((m = modem_open(dev))) {
struct llist *l = malloc(sizeof(struct llist));
assert(l);
l->modem = m;
l->next = llist;
llist = l;
n_llist++;
}
}
int modem_manager_init(int channels) {
int i;
assert(channels <= MAX_CHANNELS && channels > 0);
assert(n_llist == 0);
for (i = TTY_START; i < TTY_START+MAX_CHANNELS && n_llist < channels; i++) {
char d[PATH_MAX];
snprintf(d, sizeof(d), "/dev/ttyI%i", i);
modem_try_open(d);
}
if (n_llist < channels) {
daemon_log(LOG_ERR, "Failed to allocate the requested channels. Got %i of %i.", n_llist, channels);
modem_manager_done();
return -1;
}
return 0;
}
void modem_manager_done(void) {
while (llist) {
struct llist *l;
modem_close(llist->modem);
l = llist;
llist = llist->next;
free(l);
n_llist--;
}
assert(!n_llist && !llist);
}
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