Build kernel linux in virtualbox machine Ubuntu 10.04

This post is useful only for me, for remember what command I have to launch for compiling the kernel on the MY VirtualBox machine with Ubuntu 10.04.

However it can be useful for a starting point for other people.

$ make menuconfig

This command open a graphics menu where I check the options that are written in this link http://en.gentoo-wiki.com/wiki/Virtualbox_Guest

$ make

$ make modules

$ sudo make modules_install

$ sudo make install

$ cd /boot

$ sudo mkinitramfs -o initrd.img-2.6.32.60 2.6.32.60 (depends on the kernel version)

$ sudo grub-mkconfig -o /boot/grub/grub.cfg (I'm using grub)

When reboot the machine hold shift for choose the kernel.

Multiple forks

This is the code for generate a dynamic number of process (with the system call fork()). The father wait that all the child processes finish.

int main(int argc, char *argv[]){

    if (argc != 2){
        puts("usage prog number_of_process");
        exit(EXIT_FAILURE);
    }

    int num = atoi(argv[1]);
    int i;
    int * pids = malloc(sizeof(int)*num);

    for(i = 0; i < num; i++){

        pids[i] = fork();

        if(pids[i] == 0){
            //This is the code of the child process
            printf("begin %d\n" , i);
            sleep(10); //simulation of work
            printf("finish %d\n", i);
            exit(EXIT_SUCCESS);
        }
    }

    //Waiting the finish of all child processes
    while(wait(NULL)){
        if(errno == ECHILD)
            break;
    }
}