how can I find where is the macro or function deifined

how can I find where is the macro or function deifined

[Ahmed Soliman]

Hi;
when I used libc I never memorized where each function is located
beyond the basics (for example I never knew if strlen is in string.h
or ctype.h or strlib.h )
I just check out the functions man pages by man strlen
is their such functionality for the kernel where I dont need to
memorize the dependencies for example if MODULE_LICENSE is in kernel.h
or module.h with out using the internel to google them .

how can I find where is the macro or function deifined

[Manavendra Nath Manav]

On Tue 28 Jul, 2015 21:41 Ahmed Soliman <ahmedsoliman0x666@gmail.com> wrote:

Hi;
when I used libc I never memorized where each function is located
beyond the basics (for example I never knew if strlen is in string.h
or ctype.h or strlib.h )
I just check out the functions man pages by man strlen
is their such functionality for the kernel where I dont need to
memorize the dependencies for example if MODULE_LICENSE is in kernel.h
or module.h with out using the internel to google them .

______________________________________________



You can use cscope and/or ctags to jump directly to the symbol definition.
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how can I find where is the macro or function deifined

[Navy Cheng]

On Tue, Jul 28, 2015 at 06:03:16PM +0200, Ahmed Soliman wrote:
> Hi;
> when I used libc I never memorized where each function is located
> beyond the basics (for example I never knew if strlen is in string.h
> or ctype.h or strlib.h )
> I just check out the functions man pages by man strlen
> is their such functionality for the kernel where I dont need to
> memorize the dependencies for example if MODULE_LICENSE is in kernel.h
> or module.h with out using the internel to google them .
> 
*make tags* in the root directory of the kernel tree. Then a file named TAGS
is created. TAGS is treated as one part of the tree when *git status*. You
can load it with Vim or emacs. Google it for details. 

how can I find where is the macro or function deifined

[Gnoleba GNOGBO]

Can you give a procedure step by step  please to answer please ?
B. Regards

Gnogbo
 Le 28 juil. 2015 17:41, "Navy Cheng" <navych@126.com> a ?crit :

> On Tue, Jul 28, 2015 at 06:03:16PM +0200, Ahmed Soliman wrote:
> > Hi;
> > when I used libc I never memorized where each function is located
> > beyond the basics (for example I never knew if strlen is in string.h
> > or ctype.h or strlib.h )
> > I just check out the functions man pages by man strlen
> > is their such functionality for the kernel where I dont need to
> > memorize the dependencies for example if MODULE_LICENSE is in kernel.h
> > or module.h with out using the internel to google them .
> >
> *make tags* in the root directory of the kernel tree. Then a file named
> TAGS
> is created. TAGS is treated as one part of the tree when *git status*. You
> can load it with Vim or emacs. Google it for details.
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
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how can I find where is the macro or function deifined

[Valdis.Kletnieks at vt.edu]

On Tue, 28 Jul 2015 23:54:36 -0000, Gnoleba GNOGBO said:
> Can you give a procedure step by step  please to answer please ?

http://www.lmgtfy.com/?q=ctags+vim+tutorial
http://www.lmgtfy.com/?q=ctags+emacs+tutorial
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how can I find where is the macro or function deifined

[Iuro Nascimento]

Hi,

git grep is very usefull to find stuff in the kernel tree. You can find macros using:

git grep -n '#define list_entry('

to find file and line number of the macro list_entry.

Regards,

Iuro Nascimento

On Tue, Jul 28, 2015 at 06:03:16PM +0200, Ahmed Soliman wrote:
> Hi;
> when I used libc I never memorized where each function is located
> beyond the basics (for example I never knew if strlen is in string.h
> or ctype.h or strlib.h )
> I just check out the functions man pages by man strlen
> is their such functionality for the kernel where I dont need to
> memorize the dependencies for example if MODULE_LICENSE is in kernel.h
> or module.h with out using the internel to google them .
> 
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

how can I find where is the macro or function deifined

[Navy Cheng]

On Tue, Jul 28, 2015 at 08:25:04PM -0400, Valdis.Kletnieks at vt.edu wrote:
> On Tue, 28 Jul 2015 23:54:36 -0000, Gnoleba GNOGBO said:
> > Can you give a procedure step by step  please to answer please ?
> 
> http://www.lmgtfy.com/?q=ctags+vim+tutorial
> http://www.lmgtfy.com/?q=ctags+emacs+tutorial

Hi, Valdis
Thanks for your answer but I can't  open these links. 


For example, you have a kernel tree, ~/linux-4.1, in your pc. 

steps:

+ cd ~/linux-4.1
+ make tags  => Now,TAGS is created
+ Both emacs and vim can use TAGS. I don't konw if other editers can do such
  things
  + for emacs: 
    + *M-x visit-tags-table* and load TAGS
    + M-. =>find tag
    + C-u M-. =>go to the next matched tag
    + M-*  => return to last tag
  + for vim:
    + Just open vim in ~/linux-4.1
    + open the source files and put the cursor on the tags you are interested
    + ctrl + ] => goto the tag
    + ctrl + t => return to your last tag
    
tips:

Hi,gnognoleba
I think these answers is easy to find on the internet, and learning from the
internet is a important skill. Finding on net is faster for you. It's better to
google it first. If there is not answers you want, come to here and every one 
is pleasure to help you.
Hi