From d5f7f864605262d432c7dfeb09d785f7c38463a4 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Sun, 22 Dec 2024 00:14:52 +0900
Subject: [PATCH] udev: make worker event source take file descriptor

No functional change, just refactoring.

(cherry picked from commit 77eb6f73053a71ddd7e9156a409b138eb87c4cd6)

Resolves: RHEL-75774
---
 src/udev/udev-manager.c | 27 +++++++++++++++++++++------
 src/udev/udev-manager.h |  2 +-
 2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/src/udev/udev-manager.c b/src/udev/udev-manager.c
index 83b0a90ccf..1768da5a38 100644
--- a/src/udev/udev-manager.c
+++ b/src/udev/udev-manager.c
@@ -144,7 +144,7 @@ Manager* manager_free(Manager *manager) {
         event_queue_cleanup(manager, EVENT_UNDEF);
 
         safe_close(manager->inotify_fd);
-        safe_close_pair(manager->worker_watch);
+        safe_close(manager->worker_notify_fd);
 
         sd_device_monitor_unref(manager->monitor);
         udev_ctrl_unref(manager->ctrl);
@@ -406,7 +406,7 @@ static int worker_spawn(Manager *manager, Event *event) {
                         .monitor = TAKE_PTR(worker_monitor),
                         .properties = TAKE_PTR(manager->properties),
                         .rules = TAKE_PTR(manager->rules),
-                        .pipe_fd = TAKE_FD(manager->worker_watch[WRITE_END]),
+                        .pipe_fd = TAKE_FD(manager->worker_notify_fd),
                         .inotify_fd = TAKE_FD(manager->inotify_fd),
                         .config = manager->config,
                 };
@@ -1122,7 +1122,7 @@ Manager* manager_new(void) {
 
         *manager = (Manager) {
                 .inotify_fd = -EBADF,
-                .worker_watch = EBADF_PAIR,
+                .worker_notify_fd = -EBADF,
                 .config_by_udev_conf = UDEV_CONFIG_INIT,
                 .config_by_command = UDEV_CONFIG_INIT,
                 .config_by_kernel = UDEV_CONFIG_INIT,
@@ -1320,24 +1320,39 @@ static int manager_start_inotify(Manager *manager) {
 }
 
 static int manager_start_worker_event(Manager *manager) {
+        _cleanup_(sd_event_source_unrefp) sd_event_source *s = NULL;
+        _cleanup_close_pair_ int pair[2] = EBADF_PAIR;
         int r;
 
         assert(manager);
         assert(manager->event);
 
         /* unnamed socket from workers to the main daemon */
-        r = socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch);
+        r = socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, pair);
         if (r < 0)
                 return log_error_errno(errno, "Failed to create socketpair for communicating with workers: %m");
 
-        r = setsockopt_int(manager->worker_watch[READ_END], SOL_SOCKET, SO_PASSCRED, true);
+        r = setsockopt_int(pair[READ_END], SOL_SOCKET, SO_PASSCRED, true);
         if (r < 0)
                 return log_error_errno(r, "Failed to enable SO_PASSCRED: %m");
 
-        r = sd_event_add_io(manager->event, NULL, manager->worker_watch[READ_END], EPOLLIN, on_worker, manager);
+        r = sd_event_add_io(manager->event, &s, pair[READ_END], EPOLLIN, on_worker, manager);
         if (r < 0)
                 return log_error_errno(r, "Failed to create worker event source: %m");
 
+        (void) sd_event_source_set_description(s, "manager-worker-event");
+
+        r = sd_event_source_set_io_fd_own(s, true);
+        if (r < 0)
+                return log_error_errno(r, "Failed to make worker event source own file descriptor: %m");
+
+        TAKE_FD(pair[READ_END]);
+
+        r = sd_event_source_set_floating(s, true);
+        if (r < 0)
+                return log_error_errno(r, "Failed to make worker event source floating: %m");
+
+        manager->worker_notify_fd = TAKE_FD(pair[WRITE_END]);
         return 0;
 }
 
diff --git a/src/udev/udev-manager.h b/src/udev/udev-manager.h
index 05f9a8b709..2690d59bf3 100644
--- a/src/udev/udev-manager.h
+++ b/src/udev/udev-manager.h
@@ -28,7 +28,7 @@ typedef struct Manager {
 
         sd_device_monitor *monitor;
         UdevCtrl *ctrl;
-        int worker_watch[2];
+        int worker_notify_fd;
 
         /* used by udev-watch */
         int inotify_fd;