#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>

int getPidd();

int main(int argc, char* argv[])
{
    printf("\tCommand Center\n");

    if(argc!=1)
    {
        printf("Program is working without parameters.\n");
        exit(1);
    }
    int target_pid;


    int flag=1;
    while(flag)
    {
        target_pid=getPidd();
        switch(kill(target_pid,SIGRTMIN+6))
        {
            case 0:
                printf("Signal send succesfully!\n");
                break;
            default:
                switch(errno)
                {
                    case EINVAL:
                        printf("The value of the sig argument is an invalid or unsupported signal number\n");
                        break;
                    case EPERM:
                        printf("The process does not have permission to send the signal to any receiving process\n");
                        break;
                    case ESRCH:
                        printf("No process or process group can be found corresponding to that specified by pid\n");
                        break;
                }
                break;
        }
        printf("Send signal once again? (y/n): ");
        char c[1];
        scanf("%1c",c);
        switch(c[0])
        {
            case 'y':
                continue;
                break;
            case 'n':
                //exit(0);
                flag=0;
                break;
        }
    }
    return 0;
}
//komunikaty do kill -> errno wziete z: http://linux.die.net/man/3/kill

int getPidd()
{
    char target_pid[6];
    char *endint;
    int pid;
    while(1)
    {
        printf("Provide a PID:\n");
        scanf("%6s",target_pid);

        pid=strtol(target_pid,&endint,10);
        if(*endint || pid<2 || pid==getpid())
        {
            printf("Incorrect PID!\n");
            continue;
        }
        else
        {
            printf("PID: %d\n",pid);
            break;
        }
    }
    return pid;
}