lib_util.c

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#include "rl_util.h"

#define NUMBER_SAMPLE_RATES 10
int possible_sample_rates[NUMBER_SAMPLE_RATES] = {
    1, 10, 100, 1000, 2000, 4000, 8000, 16000, 32000, 64000};

#define NUMBER_UPDATE_RATES 4
int possible_update_rates[NUMBER_UPDATE_RATES] = {1, 2, 5, 10};

int check_sample_rate(int sample_rate) {
    for (int i = 0; i < NUMBER_SAMPLE_RATES; i++) {
        if (possible_sample_rates[i] == sample_rate) {
            return SUCCESS;
        }
    }
    return FAILURE;
}

int check_update_rate(int update_rate) {
    for (int i = 0; i < NUMBER_UPDATE_RATES; i++) {
        if (possible_update_rates[i] == update_rate) {
            return SUCCESS;
        }
    }
    return FAILURE;
}

pid_t get_pid(void) {

    // open file
    pid_t pid;
    FILE* file = fopen(PID_FILE, "r");
    if (file == NULL) { // no pid found -> no process running
        return FAILURE;
    }

    // read pid
    fread(&pid, sizeof(pid_t), 1, file); // get PID of background process

    // close file
    fclose(file);

    return pid;
}

int set_pid(pid_t pid) {

    // open file
    FILE* file = fopen(PID_FILE, "w");
    if (file == NULL) {
        rl_log(ERROR, "failed to create pid file");
        return FAILURE;
    }

    // write pid
    fwrite(&pid, sizeof(pid_t), 1, file);

    // close file
    fclose(file);

    return SUCCESS;
}