大数组在 C 中给出分段错误

问题描述

我真的是 C 的新手，所以如果这是一个绝对的初学者问题，我很抱歉，但是当我构建大型数组时遇到分段错误，我正在做的相关位是:

I am really new to C, so I am sorry if this is a absolute beginner question, but I am getting a segmentation error when I am building large array, relevant bits of what I am doing is:

unsigned long long ust_limit;
unsigned long long arr_size;

/* ust_limit gets value around here ... */

arr_size = ((ust_limit + 1) / 2) - 1;
unsigned long long numbs[(int)arr_size];

这适用于 ust_limit 的某些值，但是当它超过大约 4.000.000 时，会发生分段错误.我想要的是检测可能的段错误并优雅地失败.我怎么知道哪些值会导致分段错误.而且，这是否依赖于平台?

This works for some values of ust_limit, but when it gets above approximately 4.000.000 a segmentation fault occurs. What I want is to detect a possible segfault and fail gracefully. How can I know which values would cause a segmentation fault. And, is this something platform dependant?

推荐答案

您很可能遇到堆栈溢出，因为您在堆栈上创建了一个非常大的数组.为避免这种情况，请动态分配内存:

You are most likely getting a stack overflow, since you are creating a very large array on the stack. To avoid this, allocate the memory dynamically:

unsigned long long *numbs = malloc(arr_size * sizeof(unsigned long long));

稍后，当你完成数组时，再次释放它:

Later, when you are finished with the array, free it again:

free(numbs);

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