Date: Fri, 06 Jan 2017 12:58:12 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 215826] C++ program signal handlers not called Message-ID: <bug-215826-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D215826 Bug ID: 215826 Summary: C++ program signal handlers not called Product: Base System Version: CURRENT Hardware: amd64 OS: Any Status: New Severity: Affects Some People Priority: --- Component: misc Assignee: freebsd-bugs@FreeBSD.org Reporter: kami@freebsd.org CC: freebsd-amd64@FreeBSD.org CC: freebsd-amd64@FreeBSD.org 18 days ago I got a bug report for sysutils/powerdxx: https://github.com/lonkamikaze/powerdxx/issues/3 There is some distracting content in the report, e.g. the OP misidentified = an unrelated ACPI problem as part of the problem he/she was reporting. The issue to sum it up is, that (at least my) C++ programs don't get their signal handlers called (that includes default signal handlers that I never touched). Affected are the `loadrec` and `powerd++` binaries. The `loadrec` binary do= es not touch signal handlers, so the default handlers stay in place. I had a couple of people try to help me debug the issue and as far as we co= uld tell using truss and dtrace signals got sent, but the signal handlers just don't get called. I don't know how to debug this further (how do you debug something that is not happening?). But we found a workaround: link with `-lpthread`. My assumption is that `pthread` replaces system functions with thread safe versions and as a side effect replaces whatever got recently br= oken on CURRENT. I documented this workaround in the Makefile of my project: https://github.com/lonkamikaze/powerdxx/commit/2d80d990121802b4402cf54bc9a3= 28449ae8f326 I don't know when exactly it broke, I tested on head/r310361, the OP was running head/r310173. The problem occurs both if I include `signal(3)` via `<csignal>` or `<signal.h>` or not at all (i.e. `loadrec`). To reproduce get the last version without the workaround from the repo: https://github.com/lonkamikaze/powerdxx/tree/93a755fbc4d7ec36e5a9d4a35d5a33= 052cc0e678 --=20 You are receiving this mail because: You are the assignee for the bug.=
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