#include <sched.h>
#include <stdlib.h>

main(int args,char* argc[])
{
        struct sched_param p;
        pid_t pid;

        int policy;
        int prio,max_prio,max_rt_prio;
        char * cpolicy;

        if (args < 2) {
                pid = 0;
        }else{
                pid = atoi(argc[1]);
        }
        policy = sched_getscheduler(pid);
        sched_getparam(pid,&p);
        prio = p.sched_priority;
        max_prio = sched_get_priority_max(policy);
        max_rt_prio = sched_get_priority_max(SCHED_FIFO);

        switch(policy){
        case SCHED_OTHER:
                cpolicy = "SCHED_OTHER";
                break;
        case SCHED_RR:
                cpolicy = "SCHED_RR";
                break;
        case SCHED_FIFO:
                cpolicy = "SCHED_FIFO";
                break;
        default:
                perror("sched_getscheduler");
                exit(1);
        }
                
        if (policy == SCHED_OTHER){
                printf("%s at priority %d (MAX_PRIO(%s) = %d, MAX_PRIO(SCHED_FIFO) = %d)\n",
                       cpolicy,      prio,       cpolicy,max_prio,               max_rt_prio);
        }else{
                printf("%s at priority %d (MAX_PRIO(%s) = %d)\n",
                       cpolicy,       prio,      cpolicy, max_prio);
        }
        exit(0);
}