From owner-freebsd-current  Fri May 21  1:43: 3 1999
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Date: Fri, 21 May 1999 18:42:57 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199905210842.SAA06293@godzilla.zeta.org.au>
To: dfr@nlsystems.com, nick.hibma@jrc.it
Subject: Re: priorities
Cc: current@FreeBSD.ORG, dfr@FreeBSD.ORG, hibma@skylink.it,
	peter@netplex.com.au
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>> How do you guarantuee that the errno is positive? Add an assert
>> somewhere, like checking whether ENXIO >= PRIORITY_FAIL?
>
>They just are positive and have always been positive :-)
>
>Changing that (making errnos negative) would break so much code I don't
>even want to think about it.

From errno.h:

#ifdef KERNEL
/* pseudo-errors returned inside kernel to modify return to process */
#define	ERESTART	(-1)		/* restart syscall */
#define	EJUSTRETURN	(-2)		/* don't modify regs, just return */
#define	ENOIOCTL	(-3)		/* ioctl not handled by this layer */
#endif

Bruce


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