内核模块在X下无法输出，在传统终端下就正常

elais

1. /*
   
2. * $Id: hello.c,v 1.5 2004/10/26 03:32:21 corbet Exp $
   
3. */
   
4. #include <linux/init.h>
   
5. #include <linux/module.h>
   
6. MODULE_LICENSE("Dual BSD/GPL");
   
7. 
   
8. static int hello_init(void)
   
9. {
   
10.         printk(KERN_ALERT "Hello, world\n");
    
11.         return 0;
    
12. }
    
13. 
    
14. static void hello_exit(void)
    
15. {
    
16.         printk(KERN_ALERT "Goodbye, cruel world\n");
    
17. }
    
18. 
    
19. module_init(hello_init);
    
20. module_exit(hello_exit);
    

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这段代码是＜Linux device driver>的第一个例子
我在终端下运行一切正常而在X下打开控制台就无法输出任何文字

1. [root@localhost misc-modules]# insmod hello.ko
   
2. [root@localhost misc-modules]# rmmod hello
   
3. [root@localhost misc-modules]

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x11

可能是因为X终端是伪终端的缘故

libra_kevin

这里有说明：
http://www.faqs.org/docs/kernel/x45.html

1.2.1.2. Using X
It is highly recommended that you type in, compile and load all the examples this guide discusses. It's also highly recommended you do this from a console. You should not be working on this stuff in X.

Modules can't print to the screen like printf() can, but they can log information and warnings, which ends up being printed on your screen, but only on a console. If you insmod a module from an xterm, the information and warnings will be logged, but only to your log files. You won't see it unless you look through your log files. To have immediate access to this information, do all your work from console.

elais

谢谢各位，在网上找了很长时间都找不到答案

DoDo

记得书中在代码的下面就有关于伪终端可能不会产生输出的说明

waq

Solaris这点就好得多！直接在X下就可以打开一个Console终端，不知道Linux下为什么不可以