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  • 1 Post By anduril462

creat sequence process c programe unix

This is a discussion on creat sequence process c programe unix within the C Programming forums, part of the General Programming Boards category; hello ...I dont know if here is the right place for my question : Write a C program linear.c that ...

  1. #1
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    creat sequence process c programe unix

    hello ...I dont know if here is the right place for my question :
    Write a C program linear.c that creates a sequence of processes with a given length. By
    sequence it is meant that each created process has exactly one child.
    Let's look at some example outputs for the program.
    Here the entire process sequence consists of process 18181:
    Sara@dell:~/OSSS$ ./linear 1
    Creating process sequence of length 1.
    18181 begins the sequence.
    An example for a sequence of length three:
    Sara@dell:~/OSSS$ ./linear 3
    Creating process sequence of length 3.
    18233 begins the sequence.
    18234 is child of 18233
    18235 is child of 18234


    ........ this is coad .... BUt i could not compleate it .....
    Code:
    #include <stdio.h>
    #include <sys/types.h>
    #include <unistd.h>
    #include <stdlib.h>
    int main(int argc, char *argv[]) {
    
    int N;
    pid_t pid;
    
    int cont;
    
    if (argc != 2) {
    printf("Wrong number of command-line parameters!\n");
    return 1;
    }
    
    N = atoi(argv[1]);
    
    printf("Creating process sequence of length %d.\n",N);
    
    printf("%d begins the sequence.\n",getpid());
    
    /* What I have to do next ?????? */
    
    }

  2. #2
    - - - - - - - - oogabooga's Avatar
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    This is really quite simple. Do you know how to use fork()? Give it a try. Remember that the forked process (the child) will have the same value of N as the parent. Use a loop and count N down to 0 and stop forking at that point.
    zooro likes this.
    The cost of software maintenance increases with the square of the programmer's creativity. - Robert D. Bliss

  3. #3
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    oogabooga
    thanku .... do u mean like this ....

    but still therer is error ....


    Code:
     
    #include <stdio.h>
    #include <sys/types.h>
    #include <unistd.h>
    #include <stdlib.h>
    int main(int argc, char *argv[]) {
    
    int N;
    pid_t pid;
    
    int cont;
    
    if (argc != 2) {
    printf("Wrong number of command-line parameters!\n");
    return 1;
    }
    
    N = atoi(argv[1]);
    
    printf("Creating process sequence of length %d.\n",N);
    
    printf("%d begins the sequence.\n",getpid());
    
    /* What I have to do next ?????? */ 
    
    for(cont=0;cont>N;cont++)
     {
     if(fork() == 0){
     
    printf("%d is child of %d \n",getpid(),getppid());
     }
     }
     
    }
    Last edited by zooro; 04-17-2012 at 10:51 AM.

  4. #4
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    when i enter any number like 3

    i only get this line without sequences...

    Creating process sequence of length 3

  5. #5
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    Code:
    for(cont=0;cont>N;cont++)
    Take a close look at your loop condition.

    EDIT: And since fork() is *nix specific, it should go in the Linux/Unix forum like your other posts.
    zooro likes this.

  6. #6
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    Thank you .....anduril462 http://im.cprogramming.com/images/st...ser-online.png

    yah it should be ...

    for(cont=0;cont<N;cont++)

    but still it dosent work .....

  7. #7
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    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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