如果命令行输入中有'\ 0'字符怎么办? [英] What if there's '\0' character in command line input?

问题描述

int main(int argc,char* argv[]);

如果 A 中有一个'\ 0'字符，它将被拆分为 2 个自变量吗?

If there's a '\0' character in A, will it be split into 2 arguments ?

./programe "A"

由于无法将'\ 0'放入 A ，所以我无法轻松复制它，但是可能有人可以.

I can't reproduce it easily as I can't put an '\0' into A,but there might be someone who can.

推荐答案

参数作为C字符串传递到程序中.特别是， execve() syscall(程序可见的最低级别，通常与内核API非常接近或相同)通常使用C字符串，因此无法传递 \ 0.请注意，虽然内核通常将参数向量传递到进程的地址空间中，但是通常，嵌入式 \ 0 确实会拆分参数，但底层的 exec()界面使用(char *)的列表，因此嵌入的 \ 0 会更早地终止参数.

Parameters are passed into programs as C strings; in particular, the execve() syscall (lowest level visible to programs and generally ether very close to or identical to the kernel API) uses C strings, so it is not possible to pass \0 within a parameter. Note that, while the usual way the parameter vector is passed into the process's address space by the kernel is contiguous, so that an embedded \0 would indeed split a parameter, the low level exec() interface uses a list of (char *)s, so an embedded \0 would simply terminate the parameter early.

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