On Tue, 10 Aug 1999, Joe wrote:
> I am not a C expert so can someone tell me what the benifits
>/ disadvantages of the following lines of code are if there are
>any? The reason I am writning these lists is that I found this
>code in the kernel..
>
>#include <asm/irq.h>
>#include <asm/system.h>
>#include <asm/irq.h>
There are no benefits. However there are no problems either.
Most C header files contain preprocessor directives which
surround the entire header file and protect it against multiple
inclusion. For example:
#ifndef __MYHEADER_H__
#define __MYHEADER_H__
(Headerfile contents go here)
#endif /* __MY_HEADER_H__ */
The only thing multiple inclusion does in this case is it makes
the kernel code a bit sloppier, but it doesn't affect anything so
long as the headers all have multiple inclusion protection as
above.
--
Mike A. Harris Linux advocate GNU advocate
Computer Consultant Open Source advocate
Tea, Earl Grey, Hot...
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