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/*
 * dvb_signal.c
 *
 * Copyright (C) 2014 ManiacTwister
 *
 * 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 of the License, 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <stdio.h>
#include <ctype.h>
#include <stdint.h>
#include <linux/dvb/dmx.h>
#include <linux/dvb/frontend.h>

int main(int argc, char** argv) {
    char adapter[1024];
    int frontend_fd = -1;
    struct dvb_frontend_info Info;
    uint16_t Signal;
    uint16_t Snr;

if(argc < 2) {
        printf("Arguments: <int adapter nr>\n");
        return -1;
    }

sprintf(adapter, "/dev/dvb/adapter%s/frontend0", argv[1]);

if ((frontend_fd = open (adapter, O_RDWR | O_NONBLOCK)) < 0) {
        printf("Failed to open %s\n", adapter);
    }

if(ioctl(frontend_fd, FE_GET_INFO, &Info) < 0) {
        printf("ioctl FE_GET_INFO failed\n");
        return -1;
    }

if (ioctl(frontend_fd, FE_READ_SIGNAL_STRENGTH, &Signal) != 0) {
        printf("ioctl FE_READ_SIGNAL_STRENGTH failed\n");
    }

if (ioctl(frontend_fd, FE_READ_SNR, &Snr) != 0) {
        printf("ioctl FE_READ_SNR failed\n");
    }

printf("%s:\nSignal: %d SNR: %d\n", Info.name, ((Signal * 100 + 0x8001) >> 16), ((Snr * 100 + 0x8001) >> 16));

close(frontend_fd);
}

Private