Date: Fri, 29 May 1998 11:19:43 +1000 From: Bruce Evans <bde@zeta.org.au> To: dufault@hda.com, mike@smith.net.au Cc: current@FreeBSD.ORG Subject: Re: cdrecord trouble on currnet Message-ID: <199805290119.LAA20313@godzilla.zeta.org.au>
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>> Can you give an example of the correct mechanism for using sysconf() to
>> determine the availability of the scheduler? I'll fix it in the
>> updates I'm working on.
>
> if (sysconf(_SC_PRIORITY_SCHEDULING) == -1) {
> if (errno != 0) {
> /* This isn't valid:
> */
> err(EX_OSERR, "sysconf(_SC_PRIORITY_SCHEDULING)");
> }
> else {
> errx(EX_UNAVAILABLE,
> "No run-time support for POSIX priority scheduling");
> }
> }
The "This isn't valid" case isn't valid, since sysconf() doesn't change
errno if there is no error. errno must be set before calling sysconf().
Bruce
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