linux C进程

#include <stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<sys/types.h>
int main()
{
    pid_t pid;
    pid_t pid2;
    int var =88;
    char *str=(char*)malloc(sizeof(char)*10);
    memset(str,0x00,10);
    pid=fork();
    if(pid<0)
    {
        fprintf(stderr,"fork failed\n");
    }
    else if(pid==0)
    {
        sleep(2);
        printf("I‘m the child %d\n",pid);
        pid2 =getpid();
        printf("I‘m the child %d\n",pid2);
        strcpy(str,"lovecpc");
        var++;
    }
    else
    {
        pid2=getpid();
        printf("I‘m the parent is %d, the child is %d\n",pid2,pid);
        strcpy(str,"wantcpc");
        wait(NULL);
        printf("complete\n");
    }
    printf("str is %s, straddr = %p, var=%d, varaddr=%p \n",str,str,var,&var);
}