[理工] [OS] fork()

[mqazz1 (無法顯示)]

#include <stdio.h>
#include <unistd.h>

void func(int *input)
{
     (*input)++;
}

int main()
{
    pit_t pid;
    int k;
    k=3;
    pid = fork();

    if(pid<0)
    {
             func(&k);
             printf("k=%d ", k);
             exit(-1);
    }
    else if(pid==0)
    {
         func(&k);
         printf("k=%d ", k);
    }
    else
    {
        wait(NULL);
        func(&k);
        printf("k=%d ", k);
        exit(0);
    }
}



(A) the output k of the parent process is 4
(B) the output k of the child process is 4
(C) the last output of k is 4


請問這段程式是怎麼跑的?

謝謝

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