From: cgf@bbc.com (Chris Faylor) Subject: Re: Sergey's latest cygwin.dll and pdksh 17 Jun 1997 20:33:12 -0700 Approved: cygnus.gnu-win32@cygnus.com Distribution: cygnus Message-ID: References: <01BC7B05.DA103740@gater.krystalbank.msk.ru> Reply-To: cgf@bbc.com X-Newsreader: trn 4.0-test57 (27 Apr 97) Original-To: gnu-win32@cygnus.com X-Mailer: Perl5 Mail::Internet v1.28 Original-Sender: owner-gnu-win32@cygnus.com In article <01BC7B05.DA103740@gater.krystalbank.msk.ru>, Sergey Okhapkin wrote: >Chris Faylor wrote: >> >> #ifdef POSIX_SIGNALS >> struct sigaction act; >> >> act.sa_handler = (SIGNAL_HANDTYPE) handler; >> sigemptyset(&act.sa_mask); /* only block sig while in handler >*/ >> act.sa_flags = 0; >> # ifdef SA_INTERRUPT /* SunOS 4.x */ >> if (interact) >> act.sa_flags |= SA_INTERRUPT; /* make sure system calls are not >restarte >> d */ >> # endif >> sigaction(sig, &act, (struct sigaction *)NULL); >> >> ---- >> >> Where the 'sig' is 'SIGCHLD'. >> >> It appears that 'sig' is blocked while within the handler. Could that be >> what is going wrong? > >Cygwin.dll blocks the signal while executing signal's handler. If arrived >signal is blocked, it will be added to process's sig_pending mask. On exit >from any handler all pending signals are raised again. See exceptions.cc >for details. Probably, we have to change sig_pending from a bit mask to an >array of counters to avoid possible losts of a signals. What do you think >about? That sounds right to me. Otherwise you lose multiple arrival of signals. I did take the time to debug this yesterday, and I am mystified as to why it is failing. When I set a breakpoint on the signal handler, it is hit every time a subprocess dies, and 'zsh' continues on as it should. When I remove the breakpoint zsh 'hangs' waiting for SIGCHLD. Weird. -- http://www.bbc.com/ cgf@bbc.com "Strange how unreal VMS=>UNIX Solutions Boston Business Computing the real can be." - For help on using this list (especially unsubscribing), send a message to "gnu-win32-request@cygnus.com" with one line of text: "help".