在传递NULL时strdup转储核心 [英] strdup dumping core on passing NULL

问题描述

strdup(null)转储核心.

strdup(null) dumps core.

在ubuntu和freeBSD上都尝试过.

Tried in on ubuntu and freeBSD both.

为什么?它不应该返回null吗?

why? Shouldn't it return null?

char *b = NULL;
a = strdup(b);

这将在strdup调用中转储核心.

This will dump core on strdup call.

推荐答案

没关系.

文档暗示它的参数必须是字符串，如果还有其他含义，例如空指针，任何人都将猜测会发生什么.从本质上讲，将NULL指针传递给strdup时会得到未定义的行为.

The documentation implies that it's argument must be string, if it's something else, such as a null pointer, it's anyones guess what'll happen. In essence, you get undefined behavior when passing a NULL pointer to strdup.

如果将不希望的行为传递给函数，则函数会产生未定义的行为是很正常的.许多标准的C函数，例如strcpy，strlen也不接受空指针.

It's quite normal for functions to yield undefined behavor if you pass them something you're not supposed to. Many standard C function such as strcpy, strlen does not accept null pointers either.

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