[collectd] [Libguestfs] collectd leaks SIGCHLD == SIG_IGN into plugins

[Florian Forster]

A quick glance shows that the exec plugin actually is clearing the signal mask:
https://github.com/collectd/collectd/blob/master/src/exec.c#L526

Can you give some more context when this problem comes up? Ideally in a Github
issue (hint, hint ;).
-- 
Florian octo Forster
Hacker in training
GnuPG: 0x0C705A15
http://octo.it/
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