要man 内核的函数，该怎么man?

dxbh

如题？比如printk

prolj

http://www.digipedia.pl/man/printk.9.html

redhat008

一般GNU/Linux是man 2 printk
有的系统是man -k2 printk
要装好manpages-dev

prolj

LS大侠，这是咋回事？

1. root@xxx:~# man 2 printk
   
2. No manual entry for printk in section 2
   
3. root@xxx:~# man -k printk
   
4. root@xxx:~# man -k2 printk
   
5. man: invalid option -- 2
   
6. Try `man --help' or `man --usage' for more information.

复制代码

manpages-dev装了
KUbuntu 8.04 KDE4 AMD64

redhat008

系统调用有manpages
内核函数没有man

anhongkui

于kernel目录
make mandocs
make installmandocs

man printk

[ 本帖最后由 anhongkui 于 2008-6-7 19:33 编辑 ]

anhongkui

[root@antty linux-2.6.24]# man printk
Formatting page, please wait...


PRINTK(9)                  Kernel utility functions                  PRINTK(9)

NAME
       printk - print a kernel message

SYNOPSIS
       int printk (const char * fmt,  ...);

ARGUMENTS
       fmt    format string

       variable arguments

DESCRIPTION
       This is printk. It can be called from any context. We want it to work. Be aware of the fact that if
       oops_in_progress is not set, we might try to wake klogd up which could deadlock on runqueue lock if printk
       is called from scheduler code.

       We try to grab the console_sem. If we succeed, it’s easy - we log the output and call the console drivers.
       If we fail to get the semaphore we place the output into the log buffer and return. The current holder of
       the console_sem will notice the new output in release_console_sem and will send it to the consoles before
       releasing the semaphore.

       One effect of this deferred printing is that code which calls printk and then changes console_loglevel may
       break. This is because console_loglevel is inspected when the actual printing occurs.

SEE ALSO
       printf(3)

Kernel Hackers Manual 2.6.24       June 2008                         PRINTK(9)
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