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| From: | Ken Brown <kbrown AT cornell DOT edu> |
| To: | "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com> |
| Subject: | Re: Regression (last snapshot) |
| Date: | Thu, 1 Aug 2019 21:17:44 +0000 |
| Message-ID: | <19e73527-cb9a-a106-a57a-2895b8a520c9@cornell.edu> |
| References: | <20190729134700 DOT GO11632 AT calimero DOT vinschen DOT de> <ced2750a-0a52-1396-b6c1-f4228116bde7 AT cornell DOT edu> <20190729152327 DOT GQ11632 AT calimero DOT vinschen DOT de> <20190729154049 DOT GR11632 AT calimero DOT vinschen DOT de> <c5d01965-80b9-cece-54d2-f7462f84c0a2 AT cornell DOT edu> <8e57d4da-722d-1b9a-bd28-5f96ed182f6a AT cornell DOT edu> <0a09679b-1a0f-613b-04c8-1a63da8a00c2 AT cornell DOT edu> <33aead20-540c-ee3b-0d38-ff053fbac040 AT dronecode DOT org DOT uk> <12269538-c387-1f1e-ab5a-b36b60d09937 AT cornell DOT edu> <a61264b5-80da-52fc-7093-8e8d9a8ace33 AT redhat DOT com> <20190801160440 DOT GC11632 AT calimero DOT vinschen DOT de> |
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On 8/1/2019 12:04 PM, Corinna Vinschen wrote: > On Aug 1 10:38, Eric Blake wrote: >> On 8/1/19 10:30 AM, Ken Brown wrote: >> >>>>> OK, when xwin-xdg-menu launches an application, it creates two pipes >>>>> and sets >>>>> the application's stdout and stderr to the write ends of those pipes. >> >>> Well, I can't be sure that the pipes are responsible. It's just that >>> the existence of the pipes is the only difference I could spot between >>> an ordinary terminal and a terminal started from xwin-xdg-menu. >>> >>> Is it possible that the logging somehow slows things down or changes the >>> buffering, so that the grep process takes longer to complete? This >>> would be consistent with my theory that the broken pipe error doesn't >>> really represent a bug, but rather it reflects the fact that ls exits >>> before grep has finished writing. >> >> Could it be a case of xwin-xdg-menu calling signal(SIGPIPE, SIG_IGN) or >> similar, and accidentally letting grep inherit the ignored SIGPIPE? > > execve doesn't propagate the signal dispositions, they get reset to > default. I just realized, as a result of Eric's comment, that the explanation I've been pushing is nonsense. What I've been explaining is why there would be a broken pipe, and therefore a SIGPIPE and EPIPE. But I now see that that's not the issue. The issue is whether grep gets the SIGPIPE and terminates before it has a chance to see the EPIPE. So if grep isn't ignoring SIGPIPE, the only other possibility I can think of is that grep isn't receiving SIGPIPE, or at least that there's a delay before it receives it. Why would that happen only in terminals started by xwin-xdg-menu? Ken -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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