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- From: ddl@burrhus.harvard.edu (Dan Lanciani)
- Newsgroups: comp.unix.bsd
- Subject: Re: init, rc, signal handling (386BSD)
- Message-ID: <1992Aug14.015953.11306@burrhus.harvard.edu>
- Date: 14 Aug 92 01:59:53 GMT
- Article-I.D.: burrhus.1992Aug14.015953.11306
- References: <1992Aug13.103235.25465@ucc.su.OZ.AU>
- Organization: Harvard University, Cambridge, MA
- Lines: 24
-
- In article <1992Aug13.103235.25465@ucc.su.OZ.AU>, dawes@physics.su.OZ.AU (David Dawes) writes:
- |
- | I've noticed that signal handling gets screwed up for commands run from
- | /etc/rc. One particular example is xdm. When started from /etc/rc
- | the signal handlers it installs don't work -- the signals get ignored.
- | I checked the init source, and it resets the signal handling the SIG_DFL.
- |
- | I tried a simple program which checks this, and the default handler's are
- | correctly set -- but signals are being ignored regardless of the default
- | behaviour or if a handler is installed.
- |
- | This is making it impossible to shutdown xdm cleanly when it is started
- | at boot time from /etc/rc.
- |
- | Does anyone have any ideas about this?
-
- I have at least one idea. In the process of ``cleaning up'' the
- code, it appears that someone deleted several sigsetmask(0L) calls. So,
- assuming the mask isn't reset by fork or exec these days, /etc/rc is
- being run with init's signal mask which blocks SIGHUP and SIGTERM. (Hint
- hint: please comment these little changes so people don't blame me. :)
-
- Dan Lanciani
- ddl@harvard.*
-