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Move cgroup dbus requests to the child

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This avoids a race where a spawned child that quickly forks will have
only the parent process moved to the newly created cgroup, leaving the
early children in tmux's own cgroup.  It also avoids problems if the
spawned process inspects or changes its own cgroup.
This commit is contained in:
Daniel De Graaf
2025-03-25 22:32:19 -04:00
parent 9e1f110db0
commit d34cf29b38
3 changed files with 15 additions and 15 deletions
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21
spawn.c
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@@ -382,20 +382,19 @@ spawn_pane(struct spawn_context *sc, char **cause)
/* In the parent process, everything is done now. */
if (new_wp->pid != 0) {
#if defined(HAVE_SYSTEMD) && defined(ENABLE_CGROUPS)
/*
* Move the child process into a new cgroup for systemd-oomd
* isolation.
*/
if (systemd_move_pid_to_new_cgroup(new_wp->pid, cause) < 0) {
log_debug("%s: moving pane to new cgroup failed: %s",
__func__, *cause);
free (*cause);
}
#endif
goto complete;
}
#if defined(HAVE_SYSTEMD) && defined(ENABLE_CGROUPS)
/*
* Move the child process into a new cgroup for systemd-oomd isolation.
*/
if (systemd_move_to_new_cgroup(cause) < 0) {
log_debug("%s: moving pane to new cgroup failed: %s",
__func__, *cause);
free (*cause);
}
#endif
/*
* Child process. Change to the working directory or home if that
* fails.