Question

Write a C program (using Code::blocks) that outputs a formatted header line and creates 10 children processes each of which displays a line of the output as shown below. Notice the values of Child no and x, they have to be the same as shown here while the processes PIDs values are based on the what your system assigns to these processes.

Child    PID        PPID      X
0           13654    13653    5
1           13655    13653    10
2           13656    13653    15
3           13657    13653    20
4           13658    13653    25
5           13659    13653    30
6     13660    13653    35
7           13661    13653    40
8           13662    13653    45
9           13663    13653    50

Answer 1

#include <stdio.h>
#include <unistd.h>
#include <sys/wait.h>

int main() {

    // here only main process executes. No childs
    // get pid of main
    printf("%10s%10s%10s%10s\n", "Child", "PID", "PPID", "X");

    int x =0;
    for (int i = 0; i < 10; i++) {
        if(fork() == 0) {
                printf("%10d%10d%10d%10d\n", i, getpid(), getppid(), 5 * (i+1));
                return 0;
        }
    }

    for (int i = 0; i < 10; i++) {
        wait(NULL);
    }

    return 0;
}

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