Need help with deleting childīs parent and child subprocess

 
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Old 08-20-2011
Need help with deleting childīs parent and child subprocess

1. The problem statement, all variables and given/known data:
I need to make an program that in a loop creates one parent and five children with fork(). The problem i'm trying to solve is how to delete the parent and child of the childīs process.


2. Relevant commands, code, scripts, algorithms:
fork() and wait(), waitpid(). Iīm using Mac OS X 10.6.8.


3. The attempts at a solution (include all code and scripts):
Code:
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

int main(void) {
    int status;
    pid_t pid[5];
    pid_t w;
    int i, j;
    pid[0] = fork();
    for (i = 0;i < 6;i++) {
        if (pid[i] < 0) {
            printf("Error at level: %d\n", i);
        } else if (pid[i] == 0) {
            printf("child created: %d\n", i);
        } else {
            printf("parent created: %d\n", i);
            if ((i + 1) < 6) {
                pid[i + 1] = fork();
                printf("fork level: %d\n", i);
                w = waitpid(pid[i + 1], &status, 0);
                printf("pid %d deleted \n", pid[i + 1]);
            } else {
                break;
            }
        }
        //pid[i + 1] = fork();
    }
    for (j = 0;j < 6;j++) {
        pid[j] = wait(&status);
        printf("process: %d terminated!\n", j);
    }
    
    return 0;
}


4. Högskolan på Gotland (Gotland University), Visby (Gotland), Sweden, Magnus Wessberg, and TPV714 (i was unable to post the url because iīve not posted five times)

Last edited by WhiteFace; 08-22-2011 at 12:20 PM..
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