* Safe error numbers for User-defined return values
@ 2001-11-06 11:22 Andy Jeffries
2001-11-06 11:57 ` Alan Cox
0 siblings, 1 reply; 2+ messages in thread
From: Andy Jeffries @ 2001-11-06 11:22 UTC (permalink / raw)
To: linux-kernel
Hi,
I want to define custom return values for my ioctl calls in my Kernel module. What is the recommended start value for user defined constants? I notice asm/errno.h only goes up to 124 (in 2.4.12), so should I start at 125 or should I start at 200 to be safe?
I probably only need 30 or so different codes.
Thanks,
--
Andy Jeffries | Scramdisk Linux Project
http://www.scramdisklinux.org | Lead developer
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Safe error numbers for User-defined return values
2001-11-06 11:22 Safe error numbers for User-defined return values Andy Jeffries
@ 2001-11-06 11:57 ` Alan Cox
0 siblings, 0 replies; 2+ messages in thread
From: Alan Cox @ 2001-11-06 11:57 UTC (permalink / raw)
To: Andy Jeffries; +Cc: linux-kernel
> I want to define custom return values for my ioctl calls in my Kernel
> module. What is the recommended start value for user defined constants?
> I notice asm/errno.h only goes up to 124 (in 2.4.12), so should I start at
> 125 or should I start at 200 to be safe?
>
> I probably only need 30 or so different codes.
You want to return non base errno codes in a different field and return
real errno codes by return value. If everyone simple invented private
returns for ioctl all hell would break loose
^ permalink raw reply [flat|nested] 2+ messages in thread
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