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manager: add socket for receiving handoff timestamps from forked children

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This adds an AF_UNIX socket pair to the manager that we can collect
handoff timestamp messages on.

The idea is that forked off children send a datagram with a timestamp
and we use its sender PID to match it against the right forked off
process.

This part only implements the receiving side: a socket is created, and
listened on. Received datagrams are parsed, verified and then dispatched
to the interested units.
This commit is contained in:
Lennart Poettering
2024-04-25 13:33:03 +02:00
parent 33fc8b0d95
commit 817062e621
4 changed files with 151 additions and 17 deletions
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src/core/manager.h
+21 -17
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@@ -286,6 +286,9 @@ struct Manager {
int user_lookup_fds[2];
sd_event_source *user_lookup_event_source;
int handoff_timestamp_fds[2];
sd_event_source *handoff_timestamp_event_source;
RuntimeScope runtime_scope;
LookupPaths lookup_paths;
@@ -656,22 +659,23 @@ void unit_defaults_done(UnitDefaults *defaults);
enum {
/* most important … */
EVENT_PRIORITY_USER_LOOKUP = SD_EVENT_PRIORITY_NORMAL-10,
EVENT_PRIORITY_MOUNT_TABLE = SD_EVENT_PRIORITY_NORMAL-9,
EVENT_PRIORITY_SWAP_TABLE = SD_EVENT_PRIORITY_NORMAL-9,
EVENT_PRIORITY_CGROUP_AGENT = SD_EVENT_PRIORITY_NORMAL-8, /* cgroupv1 */
EVENT_PRIORITY_CGROUP_INOTIFY = SD_EVENT_PRIORITY_NORMAL-8, /* cgroupv2 */
EVENT_PRIORITY_CGROUP_OOM = SD_EVENT_PRIORITY_NORMAL-7,
EVENT_PRIORITY_EXEC_FD = SD_EVENT_PRIORITY_NORMAL-6,
EVENT_PRIORITY_NOTIFY = SD_EVENT_PRIORITY_NORMAL-5,
EVENT_PRIORITY_SIGCHLD = SD_EVENT_PRIORITY_NORMAL-4,
EVENT_PRIORITY_SIGNALS = SD_EVENT_PRIORITY_NORMAL-3,
EVENT_PRIORITY_CGROUP_EMPTY = SD_EVENT_PRIORITY_NORMAL-2,
EVENT_PRIORITY_TIME_CHANGE = SD_EVENT_PRIORITY_NORMAL-1,
EVENT_PRIORITY_TIME_ZONE = SD_EVENT_PRIORITY_NORMAL-1,
EVENT_PRIORITY_IPC = SD_EVENT_PRIORITY_NORMAL,
EVENT_PRIORITY_REWATCH_PIDS = SD_EVENT_PRIORITY_IDLE,
EVENT_PRIORITY_SERVICE_WATCHDOG = SD_EVENT_PRIORITY_IDLE+1,
EVENT_PRIORITY_RUN_QUEUE = SD_EVENT_PRIORITY_IDLE+2,
EVENT_PRIORITY_USER_LOOKUP = SD_EVENT_PRIORITY_NORMAL-11,
EVENT_PRIORITY_MOUNT_TABLE = SD_EVENT_PRIORITY_NORMAL-10,
EVENT_PRIORITY_SWAP_TABLE = SD_EVENT_PRIORITY_NORMAL-10,
EVENT_PRIORITY_CGROUP_AGENT = SD_EVENT_PRIORITY_NORMAL-9, /* cgroupv1 */
EVENT_PRIORITY_CGROUP_INOTIFY = SD_EVENT_PRIORITY_NORMAL-9, /* cgroupv2 */
EVENT_PRIORITY_CGROUP_OOM = SD_EVENT_PRIORITY_NORMAL-8,
EVENT_PRIORITY_HANDOFF_TIMESTAMP = SD_EVENT_PRIORITY_NORMAL-7,
EVENT_PRIORITY_EXEC_FD = SD_EVENT_PRIORITY_NORMAL-6,
EVENT_PRIORITY_NOTIFY = SD_EVENT_PRIORITY_NORMAL-5,
EVENT_PRIORITY_SIGCHLD = SD_EVENT_PRIORITY_NORMAL-4,
EVENT_PRIORITY_SIGNALS = SD_EVENT_PRIORITY_NORMAL-3,
EVENT_PRIORITY_CGROUP_EMPTY = SD_EVENT_PRIORITY_NORMAL-2,
EVENT_PRIORITY_TIME_CHANGE = SD_EVENT_PRIORITY_NORMAL-1,
EVENT_PRIORITY_TIME_ZONE = SD_EVENT_PRIORITY_NORMAL-1,
EVENT_PRIORITY_IPC = SD_EVENT_PRIORITY_NORMAL,
EVENT_PRIORITY_REWATCH_PIDS = SD_EVENT_PRIORITY_IDLE,
EVENT_PRIORITY_SERVICE_WATCHDOG = SD_EVENT_PRIORITY_IDLE+1,
EVENT_PRIORITY_RUN_QUEUE = SD_EVENT_PRIORITY_IDLE+2,
/* … to least important */
};