如何使用mcheck的堆一致性检查GNU C？ [英] How to use mcheck for Heap Consistency Check in GNU C?

问题描述

我想了解如何在GNU C库中进行堆一致性检查。我参考了 http：// www .gnu.org / software / libc / manual / html_node / Heap-Consistency-Checking.html＃Heap-Consistency-Checking

I am trying to understand how heap consistency checking works in GNU C Library. I Refered http://www.gnu.org/software/libc/manual/html_node/Heap-Consistency-Checking.html#Heap-Consistency-Checking

这里是一个示例程序我已经写了。如果我在gdb中运行并调用 mcheck（0）我的自定义 abortfn 。但它不是被调用。

Here is a sample program I have written. I expected as suggested in the manual if I run in gdb and call mcheck(0) my custom abortfn would be called. But it isn't getting called.

我在这里缺少什么？

包含必要的标头。

void *abortfn(enum mcheck_status status)
{
    switch(status) {
    case MCHECK_DISABLED:
            printf("MEMCHECK DISABLED\n");
            break;
    default:
            printf("MEMCHECK ENABLED\n");
    }
}

int main()
{
    printf("This is mcheck testing code\n");
    int *a = (int *) malloc(sizeof(int));
    *a = 10;
    printf("A: %d\n", *a);
    free(a); 
    return 0; 
}

推荐答案

今天， &调试信息（ gcc -Wall -Wextra -g ），然后使用 valgrind

Today, compiling with all warnings & debug info (gcc -Wall -Wextra -g) then using valgrind is more convenient.

但是，非常文档说：

这太晚了开始分配检查一旦你分配了任何与malloc

it is too late to begin allocation checking once you have allocated anything with malloc

那么开始 main as

 int main() {
   mcheck(abortfn); 

但是， abortfn c $ c> void 所以将其编码为：

However, your abortfn should return void so code it as:

 void abortfn(enum mcheck_status status) {                                  
   switch(status) {                                                        
    case MCHECK_DISABLED:                                           
        printf("MEMCHECK DISABLED\n");                 
        break;                               
    default:                             
        printf("MEMCHECK ENABLED\n");                    
} }                                                                

这篇关于如何使用mcheck的堆一致性检查GNU C？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！