heartbeat.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <syslog.h>

int main(int argc, char const* argv[])
{
    int pid = 0;
    int status;
    char const* run_cmd = argv[1];

    openlog("heartbeat", LOG_CONS | LOG_PID, LOG_USER);

    while(1) {
        pid = fork();
        if(pid == -1) {
            syslog(LOG_EMERG, "Fork failed.");
            exit(EXIT_FAILURE);
        } else if(pid == 0) {
            // child
            (void) chdir("/path/to/hoge");

            execlp("hoge", "hoge",
                   "arg0", "arg1"
                   NULL);

            exit(-1);
        } else {
            // parent
            wait(&status);
            syslog(LOG_INFO, "Das kind ist tot.");
            sleep(10);
        }
    }

    closelog();
    return 0;
}

See also: https://www.npmjs.com/package/forever