Question

Im looking for a way how to get rid of (kernel?) messages that appear in my ncurses app. I wrote the app myself, so i would prefer a API that redirects these messages to /dev/null. I mean messages like, a USB stick that is inserted.

I tried to add this, but unfortunately it doesn't work

freopen("/dev/null", "w", stderr);

I'm not running X, just ncurses direct from the console.

I mean messages like, a USB stick that is inserted.

Thanks!

UPDATE 1: Someone votes to close this question because it would not be related to programming. But it is, i wrote the ncurses app myself, i'm looking for a way how to disable the kernel message. I updated the question.

UPDATE 2: Let me explain what i'm doing, and whats the problem in more detail:

I'm using Tiny Core linux, thats after boots starts (self written) ncurses program. Now when you for example connect a USB drive, a message (i suspect kernel) is shown over my program. I guess the message is written straight into the framebuffer. Im using TC 5.x since i need 32 bit, im running as root and have full access to the os.

Answer 1

您应该可以使用openvt让您的程序在新的虚拟终端上运行。

我还要注意，如果您希望打破外部依赖关系，应该可以自己嵌入VT控件，但请注意，在内核版本之间使用的结构可能不稳定，并且可能需要重新编译。请参阅KBD project's来源，特别是openvt.c，了解其工作原理。

Answer 2

尝试使用以下选项通过引导参数配置内核：

loglevel = 3（或更低的值）

        0 (KERN_EMERG)      system is unusable
        1 (KERN_ALERT)      action must be taken immediately
        2 (KERN_CRIT)       critical conditions
        3 (KERN_ERR)        error conditions
        4 (KERN_WARNING)    warning conditions
        5 (KERN_NOTICE)     normal but significant condition
        6 (KERN_INFO)       informational
        7 (KERN_DEBUG)      debug-level messages

来源：https://www.kernel.org/doc/Documentation/kernel-parameters.txt

另请参阅：Change default console loglevel during boot up

Answer 3

通过写入/ dev / console可能无法阻止某些其他进程具有足够的访问权限，但您可以通过设置console = ttyS0（第一个串口）在启动时将控制台重新定义为其他设备，请参阅：

https://unix.stackexchange.com/questions/60641/linux-difference-between-dev-console-dev-tty-and-dev-tty0

此外，如果我们确切地知道哪个软件正在发送消息，则可以重新配置它（可能是动态的），但是有助于了解您正在使用的Tiny Core Linux的版本和版本？

E.g。这个网站有一个＆＃34; Core＆＃34;，＆＃34; TinyCore＆＃34;和＃34; CorePlus＆＃34;版本1.x至7

http://tinycorelinux.net/downloads.html

这有助于重现完全相同的行为并测试潜在的解决方案。

ncurses disable kernel messages on console screen?

3 个答案: