Question

克隆导致分段错误

代码：

#define STACKSIZE 16384
int variable ;
using namespace std ;
int do_something(void *) {
    variable = 42;
return 0 ;
}

int main() {
void *child_stack;
variable = 9;
child_stack = (void *) malloc(STACKSIZE);
printf("The variable was %d\n", variable);
clone(do_something, child_stack,CLONE_VM|CLONE_FILES,NULL );
sleep(1);
printf("The variable is now %d\n", variable);
free(child_stack);
return 0;
}

Answer 1

阅读man page for clone：

在运行Linux的所有处理器（HP PA处理器除外）上堆栈向下增长，因此child_stack通常指向为子堆栈设置的内存空间的最顶层地址。

所以我会尝试这样的事情：

char* child_stack = (char*) malloc(STACKSIZE);
child_stack += STACKSIZE - 1;  // set it to the topmost address
                               // of allocated space

clone(do_something, (void*) child_stack, CLONE_VM|CLONE_FILES, NULL);

clone在c ++中导致分段错误

1 个答案: