25 lines
1 KiB
C
25 lines
1 KiB
C
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$NetBSD: patch-tools_libxl_libxl_event.c,v 1.1 2018/07/24 13:40:11 bouyer Exp $
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The SIGCHLD handler just writes to a pipe where the reader is the
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same process. The idea is that this will cause poll(2) in the main
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thread to exit with the reaper pipe readable, and do child cleanup here.
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Unfortunably, is the child also has a write pipe back to the
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parent (as e.g. with pygrub), the loop in afterpoll_internal() may see the
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POLLHUP event on this pipe before the POLLIN even on the reaper pipe, and
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this will be considered as an error (from e.g. pygrub).
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work around by filtering POLLHUP events here
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--- tools/libxl/libxl_event.c.orig 2016-12-20 16:01:30.000000000 +0100
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+++ tools/libxl/libxl_event.c 2016-12-20 17:28:52.000000000 +0100
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@@ -1261,7 +1261,7 @@
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revents = afterpoll_check_fd(poller,fds,nfds,
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efd->fd,efd->events);
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- if (revents)
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+ if (revents & ~POLLHUP)
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goto found_fd_event;
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}
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/* no ordinary fd events, then */
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