rl_deamon.c

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#include "gpio.h"

#define GPIO_BUTTON 26
#define MIN_INTERVAL 1

int gpio_setup(void) {

    int ret1 = gpio_export(GPIO_BUTTON);
    int ret2 = gpio_dir(GPIO_BUTTON, IN);
    int ret3 = gpio_interrupt(GPIO_BUTTON, FALLING);

    if (ret1 == FAILURE || ret2 == FAILURE || ret3 == FAILURE) {
        return FAILURE;
    }

    return SUCCESS;
}

void interrupt_handler(int value) {

    if (value == 0) { // only react if button pressed enough long

        // get RL status
        int status = system("rocketlogger status > /dev/null");

        if (status > 0) {
            system("rocketlogger stop > /dev/null");
        } else {
            system("rocketlogger cont > /dev/null");
        }

        // debouncing
        sleep(MIN_INTERVAL);
    }
}

int main(void) {

    int timeout = -1; // infinite timeout
    if (gpio_setup() == FAILURE) {
        exit(EXIT_FAILURE);
    }

    while (1) {
        int val = gpio_wait_interrupt(GPIO_BUTTON, timeout);
        interrupt_handler(val);
    }

    exit(EXIT_SUCCESS);
}