Article View: comp.std.unix
Article #395Re: _POSIX_VDISABLE
From: Karl Heuer
Date: Tue, 24 Jul 1990 22:03
Date: Tue, 24 Jul 1990 22:03
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In article <10462@cs.utexas.edu>: >From: mcgrath%tully.Berkeley.EDU@ucbvax.Berkeley.EDU (Roland McGrath) >The problem is that the wording of the standard and the sysconf, pathconf, and >fpathconf functions were designed for boolean options and for limits which are >required to be positive integers. In these cases, -1 is a reasonable >out-of-range value. But _POSIX_VDISABLE is a character value, not restricted >to any specific range, and doesn't fit in right. The documented use of _POSIX_VDISABLE is to store it in an object of type cc_t. This is defined in 7.1.2.1 to be an unsigned integral type; hence -1 is indeed out-of-band. Unless you're trying to make cc_t an unsigned long and have _POSIX_VDISABLE be ULONG_MAX, you should be okay. Karl W. Z. Heuer (karl@kelp.ima.isc.com or ima!kelp!karl), The Walking Lint Volume-Number: Volume 20, Number 143
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!usenix!std-unix From: karl@IMA.IMA.ISC.COM (Karl Heuer) Newsgroups: comp.std.unix Subject: Re: _POSIX_VDISABLE Message-ID: <399@usenix.ORG> Date: 24 Jul 90 22:03:57 GMT References: <10462@cs.utexas.edu> Sender: std-unix@usenix.ORG Reply-To: karl@IMA.IMA.ISC.COM (Karl Heuer) Organization: Interactive Systems, Cambridge, MA 02138-5302 Lines: 16 Approved: jsq@usenix (Moderator, John Quarterman)