Date: Fri, 21 May 1999 09:58:47 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Bruce Evans <bde@zeta.org.au> Cc: nick.hibma@jrc.it, current@FreeBSD.ORG, dfr@FreeBSD.ORG, hibma@skylink.it, peter@netplex.com.au Subject: Re: priorities Message-ID: <Pine.BSF.4.05.9905210957590.509-100000@herring.nlsystems.com> In-Reply-To: <199905210842.SAA06293@godzilla.zeta.org.au>
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On Fri, 21 May 1999, Bruce Evans wrote: > >> 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 They aren't real errnos, just signals to the kernel. -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 442 9037 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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