Date: Mon, 04 Oct 1999 21:42:50 +0200 From: Marcel Moolenaar <marcel@scc.nl> To: current@FreeBSD.org Subject: HEADS UP: rebirth of sigcontext Message-ID: <37F9033A.42278634@scc.nl>
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Hi,
I just committed the sigcontext changes. sigreturn can now again be
called with an argument of type sigcontext but also with an argument of
type ucontext_t. Also, signal handlers can define their third argument
to be both of type struct sigcontext* and ucontext_t*. This should fix
the source incompatibility introduced by the sigset_t changes.
Alpha users are again advised to take precaution. Not that I expect
filesystem crashes, but simply because I can't test those changes. Maybe
in the future...
NOTE: Recompilation of doscmd is required.
For your convenience, the commit log message:
Re-introduction of sigcontext.
struct sigcontext and ucontext_t/mcontext_t are defined in such
a way that both (ie struct sigcontext and ucontext_t) can be
passed on to sigreturn. The signal handler is still given a
ucontext_t for maximum flexibility.
For backward compatibility sigreturn restores the state for the
alternate signal stack from sigcontext.sc_onstack and not from
ucontext_t.uc_stack. A good way to determine which value the
application has set and thus which value to use, is still open
for discussion.
NOTE: This change should only affect those binaries that use
sigcontext and/or ucontext_t. In the source tree itself
this is only doscmd. Recompilation is required for those
applications.
This commit also fixes a lot of style bugs without hopefully
adding new ones.
NOTE: struct sigaltstack.ss_size now has type size_t again. For
some reason I changed that into unsigned int.
Parts submitted by: bde
sigaltstack bug found by: bde
--
Marcel Moolenaar mailto:marcel@scc.nl
SCC Internetworking & Databases http://www.scc.nl/
The FreeBSD project mailto:marcel@FreeBSD.org
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