linux-kernel - 如何从 linux 内核模块获取主机名？

Question

我觉得这个标题很好理解。我可以读取 procfs 文件/proc/sys/kernel/hostname，但是从内核空间读取文件是个坏主意。还有其他办法吗？

Answer 1

uname man page说:

the field nodename is meaningless: it gives the name of the present machine in some undefined network, but typically machines are in more than one network and have several names. Moreover, the kernel has no way of knowing about such things, so it has to be told what to answer here.

如果您真的认为需要主机名，请使用如下代码:

#include <linux/utsname.h>

printk("hostname: %s\n", utsname()->nodename);