iphone bus error的原因

最新推荐文章于 2022-09-11 04:34:38 发布

dadalan

最新推荐文章于 2022-09-11 04:34:38 发布

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分类专栏： iphone 文章标签： iphone compiler c

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本文介绍了一个会导致总线错误的C/C++程序示例，该示例通过修改指针使其指向非法内存区域，尝试访问该区域时会触发错误。

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访问了非法指针。

The bus in question is the address buss and it contains an illegal value. This is almost always the result of dereferencing a pointer that contains an illegal value.

Here is a program that, I think, will compile with every C or C++ compiler, but should cause a bus error when the second printf is attempted...

Code:

#ifdef __STDC__
#define PROTOTYPICAL
#endif
#ifdef __cplusplus
#define PROTOTYPICAL
#endif

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#ifdef PROTOTYPICAL
int main(int argc, char *argv[])
#else
main(argc,argv)
char *argv[];
#endif
{
      double d = 1.23456789;
      double *p = &d;
      printf ( " d = %f /n" , *p);
      p = (double *)((char *)p + 1);
      printf ( " d = %f /n" , *p);
      exit(0);
}