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=215826 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 does 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 could 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 broken on CURRENT. I documented this workaround in the Makefile of my project: https://github.com/lonkamikaze/powerdxx/commit/2d80d990121802b4402cf54bc9a328449ae8f326 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/93a755fbc4d7ec36e5a9d4a35d5a33052cc0e678 -- You are receiving this mail because: You are the assignee for the bug.
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