From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sat, 27 Sep 2014 10:10:06 +0000 (+0100)
Subject: process: Introduce afterfork()
X-Git-Tag: base.ipv6-polypath-fixes-2.v1~56
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/secnet/commitdiff_plain/5e7a5e2d42c1b06f249debca72c10ad33d157402?hp=5e7a5e2d42c1b06f249debca72c10ad33d157402

process: Introduce afterfork()

Rework set_default_signals into afterfork, which does the sigprocmask
too.  This is necessary for processes we fork after
setup_signal_handling(), which otherwise inherit our blocking mask and
non-default handlers.

Call it after each fork() (except the ones we use for daemonising).
As a consequence:
 - hackypar children will die if they get a terminating signal
 - our subprocesses such as `route' and `ifconfig' will inherit
   reasonable signal setups
 - it will be correct to call udp_make_socket during phase RUN
   (previously any authbind would get a strange signal setup)

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---