#include"stdio.h"
#include "unistd.h"
int main()
{
pid_t pid;
int var =0;
int i;
printf("for test!\n");
printf("in parent process!\n");
pid = fork();
if(pid > 0)
{
for(i=0;i<3;i++)
printf("after call fork,im parent process,var[%d],&var[%d]\n",var++,(&var));
}
else if(pid == 0)
{
for(i=0;i<5;i++)
printf("after call fork,im child process,var[%d],&var[%d]\n",var++,&var);
}
else
printf("after call fork,call fork failed !\n");
return 0;
}
结果输出：
for test!
in parent process!
after call fork,im parent process,var[0],&var[2280776]after call fork,im child p
rocess,var[0],&var[2280776]
after call fork,im parent process,var[1],&var[2280776]after call fork,im child p
rocess,var[1],&var[2280776]
after call fork,im parent process,var[2],&var[2280776]after call fork,im child p
rocess,var[2],&var[2280776]
after call fork,im child process,var[3],&var[2280776]
after call fork,im child process,var[4],&var[2280776]
为什么变量var的地址一样，数值却不能进行累加呢？“多进程地址空间是独立的，虽然两个指针的值相同，但他们是不同进程空间的”，谁能给解释下不同进程地址空间么？
