hw2_syscalls.c

#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>

int sys_is_short(pid_t pid) {
    struct task_struct* ts = find_task_by_pid(pid);
    if (!ts) {
        return -ESRCH;
    }
    if (ts->policy != SCHED_SHORT) {
        return -EINVAL;
    }
    return  (ts->is_overdue == OVERDUE ? 0 : 1);
}


int sys_short_remaining_time(pid_t pid) {
    struct task_struct* ts = find_task_by_pid(pid);
    if (!ts) {
        return -ESRCH;
    }
    if (ts->policy != SCHED_SHORT) {
        return -EINVAL;
    }
    
    return (ts->time_slice * 1000) / HZ;

}


int sys_short_place_in_queue(pid_t pid)
{
    return _short_place_in_queue(pid);
}