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core: add comment explaining event source deallocation

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Followup for bc989831e6. The original reproducer still works w/o the unref,
and doesn't work with this change.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2021-07-01 11:06:45 +02:00
parent fac6511e49
commit 13bb1ffb91
1 changed files with 5 additions and 5 deletions
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10
src/core/service.c
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@ -3384,11 +3384,6 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
else
clean_mode = EXIT_CLEAN_DAEMON;
if (s->main_pid == pid)
/* Clean up the exec_fd event source. The source owns its end of the pipe, so this will close
* that too. */
s->exec_fd_event_source = sd_event_source_disable_unref(s->exec_fd_event_source);
if (is_clean_exit(code, status, clean_mode, &s->success_status))
f = SERVICE_SUCCESS;
else if (code == CLD_EXITED)
@ -3401,6 +3396,11 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
assert_not_reached("Unknown code");
if (s->main_pid == pid) {
/* Clean up the exec_fd event source. We want to do this here, not later in
* service_set_state(), because service_enter_stop_post() calls service_spawn().
* The source owns its end of the pipe, so this will close that too. */
s->exec_fd_event_source = sd_event_source_disable_unref(s->exec_fd_event_source);
/* Forking services may occasionally move to a new PID.
* As long as they update the PID file before exiting the old
* PID, they're fine. */