Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!sun-barr!decwrl!decvax!ima!haddock!karl
From: karl@haddock.ima.isc.com (Karl Heuer)
Newsgroups: comp.lang.c
Subject: Re: Reporting errors from local libraries
Message-ID: <13704@haddock.ima.isc.com>
Date: 14 Jun 89 18:23:48 GMT
References: <9449@alice.UUCP> <Jun.8.14.27.29.1989.6740@math.rutgers.edu> <186@cbnewsd.ATT.COM> <25447@agate.BERKELEY.EDU>
Reply-To: karl@haddock.ima.isc.com (Karl Heuer)
Organization: Interactive Systems, Boston
Lines: 14

In article <25447@agate.BERKELEY.EDU> bks@ALFA.berkeley.edu ( Brad Sherman ) writes:
>If one has N libraries and all functions in these libraries return
>0 on success and -1 on failure, and one wishes, say, to set an (extern)
>integer "Localerrno" to provide additional info on failure, what is the
>guruish way to proceed?  That is, where exactly should the single instance
>of "int Localerrno" appear?

In a separate module.  I.e., create "Localerrno.c" containing the single line
"int Localerrno = 0;" and hope that your linker is smart enough to handle it.

(Unfortunately, if it isn't smart enough, it's probably for what the vendor
believes is a good reason, and so a bug report is likely to be ignored.)

Karl W. Z. Heuer (ima!haddock!karl or karl@haddock.isc.com), The Walking Lint