23 Mar
2003
23 Mar
'03
1:32 p.m.
X-Unix-From: michael_davidson(a)pacbell.net Tue Dec 31
17:04:50 2002
Date: Tue, 31 Dec 2002 08:02:37 -0800
From: Michael Davidson <michael_davidson(a)pacbell.net>
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To: Wolfgang Helbig <helbig(a)Informatik.BA-Stuttgart.DE>
CC: pups(a)minnie.tuhs.org
Subject: Re: [pups] V7 setjmp/longjmp
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Wolfgang Helbig wrote:
You can trust
register variables when setjmp() returns the second time. Then
the registers are restored to the values they had when the "next" function was
called, that is the "values as of the time longjmp() was called" (quoted from
longjmp(3)'s man page. Thus any variable behaves the same, regardless of its
storage class.
Yes, you are right - V7 restores the register variables to a state which
is consistent with the other auto variables in the function - ie the value
which they had when longjmp was called.
The caveats about not relying on register variables applied to V6.