Need help with deleting child�s parent and child subprocess Post: 302548965

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Homework and Emergencies Homework & Coursework Questions Need help with deleting child�s parent and child subprocess Post 302548965 by WhiteFace on Saturday 20th of August 2011 05:24:31 AM

08-20-2011

Registered User

Need help with deleting child�s 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 child�s process.

2. Relevant commands, code, scripts, algorithms:
fork() and wait(), waitpid(). I�m 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. H�gskolan p� Gotland (Gotland University), Visby (Gotland), Sweden, Magnus Wessberg, and TPV714 (i was unable to post the url because i�ve not posted five times)

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

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create_child

create child(1m)														  create child(1m)

NAME

       create child - Creates a child pointer at the master replica of the parent directory

SYNOPSIS

       cdscp create child child-name clearinghouse clearinghouse-name

ARGUMENTS

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DESCRIPTION

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       it uses child pointers to locate directory replicas.  Use the set cdscp preferred clearinghouse command	before	issuing  this  command	to
       ensure that the request is directed to the master replica.

   Privilege Required
       You must have insert permission to the parent directory.

NOTES

       Use  the  create  child	command  only  to  re-create a child pointer that is accidentally deleted. This command is designed only for trou-
       bleshooting.

       This command will fail if the associated directory does not exist.  If the associated directory exists, this command will  return  success-
       fully.

       This command is replaced at Revision 1.1 by the dcecp command and may not be provided in future releases of DCE.

EXAMPLE

       The  following  command	creates the child pointer in the parent directory /.:/subsys.  It uses the replica located at the /.:/subsys/NY_CH
       clearinghouse to fill in its replica set.

       cdscp> create child /.:/subsys clearinghouse /.:/subsys/NY_CH

RELATED INFORMATION

       Commands: delete child(1m), list child(1m), show child(1m)

																  create child(1m)

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