udev: timeout - warn after a third of the timeout before killing

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>

1 files changed, 30 insertions, 10 deletions

diff --git a/src/udev/udev-event.c b/src/udev/udev-event.c
index 0aa43d3a2b..a0a1060d57 100644
--- a/src/udev/udev-event.c
+++ b/src/udev/udev-event.c
@@ -542,6 +542,7 @@ out:
 
 static int spawn_wait(struct udev_event *event,
                       usec_t timeout_usec,
+                      usec_t timeout_warn_usec,
                       const char *cmd, pid_t pid) {
         struct pollfd pfd[1];
         int err = 0;
@@ -551,6 +552,7 @@ static int spawn_wait(struct udev_event *event,
 
         while (pid > 0) {
                 int timeout;
+                int timeout_warn = 0;
                 int fdcount;
 
                 if (timeout_usec > 0) {
@@ -559,13 +561,17 @@ static int spawn_wait(struct udev_event *event,
                         age_usec = now(CLOCK_MONOTONIC) - event->birth_usec;
                         if (age_usec >= timeout_usec)
                                 timeout = 1000;
-                        else
-                                timeout = ((timeout_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
+                        else {
+                                if (timeout_warn_usec > 0)
+                                        timeout_warn = ((timeout_warn_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
+
+                                timeout = ((timeout_usec - timeout_warn_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
+                        }
                 } else {
                         timeout = -1;
                 }
 
-                fdcount = poll(pfd, 1, timeout);
+                fdcount = poll(pfd, 1, timeout_warn);
                 if (fdcount < 0) {
                         if (errno == EINTR)
                                 continue;
@@ -574,8 +580,20 @@ static int spawn_wait(struct udev_event *event,
                         goto out;
                 }
                 if (fdcount == 0) {
-                        log_error("timeout: killing '%s' [%u]", cmd, pid);
-                        kill(pid, SIGKILL);
+                        log_warning("slow: '%s' [%u]", cmd, pid);
+
+                        fdcount = poll(pfd, 1, timeout);
+                        if (fdcount < 0) {
+                                if (errno == EINTR)
+                                        continue;
+                                err = -errno;
+                                log_error("failed to poll: %m");
+                                goto out;
+                        }
+                        if (fdcount == 0) {
+                                log_error("timeout: killing '%s' [%u]", cmd, pid);
+                                kill(pid, SIGKILL);
+                        }
                 }
 
                 if (pfd[0].revents & POLLIN) {
@@ -655,6 +673,7 @@ out:
 
 int udev_event_spawn(struct udev_event *event,
                      usec_t timeout_usec,
+                     usec_t timeout_warn_usec,
                      const char *cmd, char **envp, const sigset_t *sigmask,
                      char *result, size_t ressize) {
         struct udev *udev = event->udev;
@@ -737,7 +756,7 @@ int udev_event_spawn(struct udev_event *event,
                            outpipe[READ_END], errpipe[READ_END],
                            result, ressize);
 
-                err = spawn_wait(event, timeout_usec, cmd, pid);
+                err = spawn_wait(event, timeout_usec, timeout_warn_usec, cmd, pid);
         }
 
 out:
@@ -829,6 +848,7 @@ static int rename_netif(struct udev_event *event) {
 
 void udev_event_execute_rules(struct udev_event *event,
                               usec_t timeout_usec,
+                              usec_t timeout_warn_usec,
                               struct udev_rules *rules, const sigset_t *sigmask) {
         struct udev_device *dev = event->dev;
 
@@ -843,7 +863,7 @@ void udev_event_execute_rules(struct udev_event *event,
                 if (major(udev_device_get_devnum(dev)) != 0)
                         udev_watch_end(event->udev, dev);
 
-                udev_rules_apply_to_event(rules, event, timeout_usec, sigmask);
+                udev_rules_apply_to_event(rules, event, timeout_usec, timeout_warn_usec, sigmask);
 
                 if (major(udev_device_get_devnum(dev)) != 0)
                         udev_node_remove(dev);
@@ -876,7 +896,7 @@ void udev_event_execute_rules(struct udev_event *event,
                         }
                 }
 
-                udev_rules_apply_to_event(rules, event, timeout_usec, sigmask);
+                udev_rules_apply_to_event(rules, event, timeout_usec, timeout_warn_usec, sigmask);
 
                 /* rename a new network interface, if needed */
 
@@ -1018,7 +1038,7 @@ void udev_event_execute_rules(struct udev_event *event,
         }
 }
 
-void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, const sigset_t *sigmask) {
+void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, usec_t timeout_warn_usec, const sigset_t *sigmask) {
         struct udev_list_entry *list_entry;
 
         udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
@@ -1041,7 +1061,7 @@ void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, const
 
                         udev_event_apply_format(event, cmd, program, sizeof(program));
                         envp = udev_device_get_properties_envp(event->dev);
-                        udev_event_spawn(event, timeout_usec, program, envp, sigmask, NULL, 0);
+                        udev_event_spawn(event, timeout_usec, timeout_warn_usec, program, envp, sigmask, NULL, 0);
                 }
         }
 }