dot/dot.c

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

void print_datetime(time_t now) {
    struct tm *local = localtime(&now);
    char buffer[20];
    strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M", local);
    printf("%s", buffer);
}

void print_load() {
    double loadavg[3];
    if (getloadavg(loadavg, 3) == -1) {
        perror("getloadavg failed");
        return;
    }
    if(loadavg[0] > 1.0){
        int result = system("ps aux | awk '$3 > 1.0' | sort -k3 -nr");
        (void)result;
    }
    printf("%.2f %.2f %.2f", loadavg[0], loadavg[1], loadavg[2]);
}

int main(int argc, char *argv[]) {
    time_t start_time = time(NULL);
    while (true) {
        for(int i = 1; i < argc; i++){
            printf("%s ", argv[i]);
        }
        if(argc == 1){
            printf("%s", "\rUpdate ");
        }
        print_datetime(time(NULL));
        printf("%s", " since ");
        print_datetime(start_time);
        printf("%s", ". ");
        printf("%s", "Load: ");
        print_load();
        printf(".%s", "\n");
        fflush(stdout);
        usleep(59 * 1000 * 1000);
    }
    return 0;
}