task9

#include <stdio.h>
#include <sched.h>
#include <sys/mman.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>

void itoa(char *buf, int value) { sprintf(buf, "%d", value); }

int main(void)
{
    int i, pid, ppid, status;
    int fdrd, fdwr;
    char str1[10], str2[10];
    char c;
    struct sched_param shdprm;

    if (mlockall((MCL_CURRENT | MCL_FUTURE)) < 0)
        perror("mlockall error");

    pid = getpid();
    ppid = getppid();

    shdprm.sched_priority = 1;
    if (sched_setscheduler(0, SCHED_RR, &shdprm) == -1)
        perror("SCHED_SETSCHEDULER_1");

    if ((fdrd = open("infile.txt", O_RDONLY)) == -1)
        perror("Openning file");

    if ((fdwr = creat("outfile.txt", 0666)) == -1)
        perror("Creating file");

    itoa(str1, fdrd);
    itoa(str2, fdwr);

    for (i = 0; i < 2; i++)
        if (fork() == 0)
        {
            shdprm.sched_priority = 50;
            if (sched_setscheduler(0, SCHED_RR, &shdprm) == -1)
                perror("SCHED_SETSCHEDULER_1");
            execl("son", "son", str1, str2, NULL);
        }
    system("ps -o uid,gid,ruid,pid,ppid,pgid,tty,vsz,stat,command > file.txt");
    if (close(fdrd) != 0)
        perror("Closing file");

    for (i = 0; i < 2; i++)
        printf("process pid = %d finished\n", wait(&status));
    return 0;
}

#include <sched.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
    if (mlockall((MCL_CURRENT | MCL_FUTURE)) < 0)
        perror("mlockall error");
    char c;
    int pid, ppid, buf;
    int fdrd = atoi(argv[1]);
    int fdwr = atoi(argv[2]);
    pid = getpid();
    ppid = getppid();

    printf("son file decriptor = %d\n", fdrd);
    printf("son params:  pid=%i  ppid=%i\n", pid, ppid);

    sleep(5);

    for (;;)
    {
        if (read(fdrd, &c, 1) != 1)
            return 0;
        write(fdwr, &c, 1);
        printf("pid = %d: %c\n", pid, c);
    }
    return 0;
}