Path: utzoo!mnetor!uunet!seismo!sundc!netxcom!ewiles
From: ewiles@netxcom.UUCP (Edwin Wiles)
Newsgroups: comp.sources.bugs
Subject: Re: Perl Bugs and Comments
Message-ID: <688@netxcom.UUCP>
Date: 29 Feb 88 13:38:08 GMT
References: <69600002@sushi> <1418@devvax.JPL.NASA.GOV>
Reply-To: ewiles@netxcom.UUCP (Edwin Wiles)
Organization: NetExpress Communications, Inc., Vienna, VA
Lines: 27
Summary: ENOTTY problem

In article <1418@devvax.JPL.NASA.GOV> lwall@devvax.JPL.NASA.GOV (Larry Wall)
writes:
>In article <69600002@sushi> tchrist@sushi.UUCP writes:
>: A) $! is always 25 (ENOTTY), regardless of what I've just done.
>:    The documentation says it should contain "the current value 
>:    of errno, with all the usual caveats".  I think I understand how
>:    things interract with errno, but I can't explain this one.
>
>I can't explain it either.  It works fine here on both Sun and Vax.  Is your
>errno declared to be something other than int maybe?  Is your compiler blowing
>the cast to (double) in stab_str()?

	I've run into this problem before.  (Xenix, on PC/AT)  It seems
	that sprintf, and possibly others in the 'print' family, make a
	call to "isatty()".  Of course, since it isn't printing to a tty
	(sprintf that is...) it returns false, and sets errno to 'ENOTTY'.
	A d*mn nussance, since it requires that we save the value of errno
	before doing any sprintf, if we expect to need it afterward.

	(Larry!  I'm supprised!  I thought you'd know about this one!)

					Later!
-- 
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