ex2.c

/* Another wdog client example, using compat API, press Ctrl-C to exit ...
 *
 * Copyright (c) 2016-2024  Joachim Wiberg <troglobit@gmail.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "wdog.h"

extern char *__progname;
extern int   __wdog_testmode;

#define DEBUG(fmt, args...)  if (dbg) printf("%s: " fmt "\n", __progname, ##args);
#define PERROR(fmt, args...) if (dbg) fprintf(stderr, "%s: " fmt ": %s\n", __progname, ##args, strerror(errno));

int main(int argc, char *argv[])
{
    int id, i, dbg = 0;
    unsigned int ack = -1;
    wdog_reason_t reason;

    if (argc >= 2 && !strncmp(argv[1], "-V", 2))
        dbg = 1;

    DEBUG("Checking connectivity with watchdogd ...");
    if (wdog_ping()) {
        PERROR("Failed connectivity check");
        return 1;
    }
    wdog_set_debug(dbg);
    wdog_get_debug(&id);
    DEBUG("OK (debug:%d)!", id);

    wdog_reset_reason(&reason);
    printf("Reset counter: %u\n", reason.counter);
    printf("Reset reason: %d - %s\n", reason.code, wdog_reset_reason_str(&reason));
    switch (reason.code) {
    case WDOG_FAILED_SUBSCRIPTION:
    case WDOG_FAILED_KICK:
    case WDOG_FAILED_UNSUBSCRIPTION:
    case WDOG_FAILED_TO_MEET_DEADLINE:
        printf("Process wid %d, label %s\n", reason.wid, reason.label);
        break;
    default:
        break;
    }

    id = wdog_subscribe(NULL, 2000, &ack);
    if (id < 0) {
        perror("Failed connecting to wdog");
        return 1;
    }

    printf("Press Ctrl-C to exit.\n");
    for (i = 0; i < 200; i++) {
        DEBUG("Kicking ...");
        if (wdog_kick(id, 2000, ack, &ack))
            PERROR("Failed kicking");

        sleep(1);
        if (i == 30)
            wdog_forced_reset("Terminal failure");
    }

    DEBUG("Exiting ...");
    if (wdog_unsubscribe(id, ack)) {
        PERROR("Failed unsubscribe");
        return 1;
    }

    return 0;
}