tree 4283f0d59c948b31555c2ad853ab5f2c0b39c46a
parent ce0162e4ad5ab37471ae0673ef2e3f873e313bb7
author Willy Tarreau <w@1wt.eu> 1456556330 +0100
committer Willy Tarreau <w@1wt.eu> 1457451140 +0100
encoding latin1

BUG/MINOR: systemd: ensure we don't miss signals

There's a race condition in the systemd wrapper. People who restart it
too fast report old processes remaining there. Here if the signal is
caught before entering the "while" loop we block indefinitely on the
wait() call. Let's check the caught signal before calling wait(). It
doesn't completely close the race, a window still exists between the
test of the flag and the call to wait(), but it's much smaller. A
safer solution could involve pselect() to wait for the signal
delivery.
(cherry picked from commit 1ab5e8642a3537006db8eeed4a3b1bdca2458b33)
(cherry picked from commit 81b394f75eab23044e0729dd9386bf860481ee3a)