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systemd: rewatch pids under cgroup v1 when sigchld of processes more than main pid and control pid is captured

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If `Delegate` is configured in service, cgroup agent will never send out
any datagram as .control subcgroup is generated. Thus systemd will watch
all processes on the cgroup hierarchy for SIGCHLD to deal with unreliable
cgroup notifications.

In this way, systemd should rewatch all processes when any SIGCHLD is
captured, more than the control pid or main pid.
This commit is contained in:
chenjiayi 2024-09-18 11:12:34 +08:00 committed by Lennart Poettering
parent dfb3155419
commit 4fc8a63f9e
1 changed files with 1 additions and 1 deletions
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src/core/service.c
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@ -4169,7 +4169,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
* detect when the cgroup becomes empty. Note that the control process is always
* our child so it's pointless to watch all other processes. */
if (!control_pid_good(s))
if (!s->main_pid_known || s->main_pid_alien)
if (!s->main_pid_known || s->main_pid_alien || unit_cgroup_delegate(u))
(void) unit_enqueue_rewatch_pids(u);
}