Why do { // do something ; } while (0); ?

2012-12-13 Thread Shraddha Kamat 
I notice
 
do {
   // do something 1 ; 
   // do something 2 ;
   ...
} while (0); 

being used everywhere in the kernel code
I just can't guess of any use of this other 
than executing couple of C statements together ?

Is there any special purpose of doing this ?? 
Sorry of such a silly question - I am just trying 
to learn kernel hacking basics.

-- Shraddha  


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Re: Why do { // do something ; } while (0); ?

2012-12-13 Thread Adam Lee 
On Thu, Dec 13, 2012 at 02:25:37PM +0530, Shraddha Kamat wrote:
 I notice
  
 do {
// do something 1 ; 
// do something 2 ;
...
 } while (0); 
 
 being used everywhere in the kernel code
 I just can't guess of any use of this other 
 than executing couple of C statements together ?
 
 Is there any special purpose of doing this ?? 
 Sorry of such a silly question - I am just trying 
 to learn kernel hacking basics.

http://kernelnewbies.org/FAQ/DoWhile0

-- 
Regards,
Adam Lee
http://adam8157.info

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Re: Why do { // do something ; } while (0); ?

2012-12-13 Thread Adel Qodmani 
On Thu, Dec 13, 2012 at 10:55 AM, Shraddha Kamat sh200...@gmail.com wrote:

 I notice

 do {
// do something 1 ;
// do something 2 ;
...
 } while (0);

 being used everywhere in the kernel code
 I just can't guess of any use of this other
 than executing couple of C statements together ?

 Is there any special purpose of doing this ??
 Sorry of such a silly question - I am just trying
 to learn kernel hacking basics.

 -- Shraddha


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 Kernelnewbies@kernelnewbies.org
 http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies


http://stackoverflow.com/questions/257418/do-while-0-what-is-it-good-for

This link gives you a pretty good answer.
The basic rational behind using such a construct is when you want to a
define a multi-line macro.
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