Date: Thu, 26 Feb 1998 21:44:46 -0800 (PST) From: Doug Ambrisko <ambrisko@whistle.com> To: hackers@FreeBSD.ORG Subject: Re: a chicken-egg problem with bootp and nfs_mountroot Message-ID: <199802270544.VAA08864@crab.whistle.com> In-Reply-To: <199802270504.VAA26238@dingo.cdrom.com> from Mike Smith at "Feb 26, 98 09:04:07 pm"
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Mike Smith writes:
| > John-Mark Gurney writes:
| > | Doug Ambrisko scribbled this message on Feb 26:
| > | > BTW anyone know how to pass a string in via a #define in config?
| > |
| > | in your config file:
| > | options "DEFINENAME=string value"
| > |
| > | should do it...
| >
| >
| > Don't think so for example:
| > options "BOOTP_WIRED_TO=fxp0"
|
| options "BOOTP_WIRED_TO=\"fxp0\""
|
| You may need to triple the backslashes, it's been a while since I tried
| this.
With single, double or triple backslashes I get a syntax error when I run
config. Archie was close. Looking in the cpp info page I found this example
> #define xstr(s) str(s)
> #define str(s) #s
> #define foo 4
> xstr (foo)
> This expands into `"4"', not `"foo"'.
Doing just
> #define str(s) #s
> #define foo 4
> str (foo)
> expands to `"foo"'.
So now I have:
options "BOOTP_WIRED_TO=fxp0"
and the c-snippet from nfs/bootp_subr.c
/*
* Find a network interface.
*/
for (ifp = TAILQ_FIRST(&ifnet); ifp != 0; ifp = TAILQ_NEXT(ifp,if_link))
#ifdef BOOTP_WIRED_TO
#define xstr(s) str(s)
#define str(s) #s
{
sprintf(ireq.ifr_name, "%s%d", ifp->if_name,ifp->if_unit);
if (strcmp(ireq.ifr_name,xstr(BOOTP_WIRED_TO)) == 0)
break;
}
#else
if ((ifp->if_flags &
(IFF_LOOPBACK|IFF_POINTOPOINT)) == 0)
break;
#endif
and this works!
Doug A.
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