什么是SEGV_MAPERR? [英] What is SEGV_MAPERR?

问题描述

什么是SEGV_MAPERR，为什么总是出现SIGSEGV?

What is SEGV_MAPERR, why does it always come up with SIGSEGV?

推荐答案

There are two common kinds of SEGV, which is an error that results from an invalid memory access:

1. 访问了具有错误权限的页面.例如，它是只读的，但是您的代码尝试写入它.这将报告为 SEGV_ACCERR .
2. 所访问的页面甚至根本没有映射到应用程序的地址空间.这通常是由于取消引用空指针或使用小整数值损坏的指针而导致的.据报道为 SEGV_MAPERR .

1. A page was accessed which had the wrong permissions. E.g., it was read-only but your code tried to write to it. This will be reported as SEGV_ACCERR.
2. A page was accessed that is not even mapped into the address space of the application at all. This will often result from dereferencing a null pointer or a pointer that was corrupted with a small integer value. This is reported as SEGV_MAPERR.

有关SEGV_MAPERR的某种文档(带索引的Linux源代码)在这里: http://lxr.free-electrons.com/ident?i=SEGV_MAPERR .

Documentation of a sort (indexed Linux source code) for SEGV_MAPERR is here: http://lxr.free-electrons.com/ident?i=SEGV_MAPERR.

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