send monitor events back to netlink socket

[elogind.git] / udev / udevd.c

diff --git a/udev/udevd.c b/udev/udevd.c
index 094175ac4a4a75354d537edc7b79d38c17b27637..d9de26ea6cc705e8912bebc897ae3451f8d021fc 100644 (file)
--- a/udev/udevd.c
+++ b/udev/udevd.c
@@ -1,6 +1,8 @@
 /*
  * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
  * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
+ * Copyright (C) 2009 Canonical Ltd.
+ * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -69,6 +71,7 @@ static volatile int sigchilds_waiting;
 static volatile int udev_exit;
 static volatile int reload_config;
 static volatile int signal_received;
+static volatile pid_t settle_pid;
 static int run_exec_q;
 static int stop_exec_q;
 static int max_childs;
@@ -192,7 +195,6 @@ static void event_fork(struct udev_event *event)
        switch (pid) {
        case 0:
                /* child */
-               udev_monitor_unref(kernel_monitor);
                udev_ctrl_unref(udev_ctrl);
                logging_close();
                logging_init("udevd-event");
@@ -226,6 +228,15 @@ static void event_fork(struct udev_event *event)
                if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
                        udev_event_execute_run(event);
 
+               /* apply/restore inotify watch */
+               if (err == 0 && event->inotify_watch) {
+                       udev_watch_begin(event->udev, event->dev);
+                       udev_device_update_db(event->dev);
+               }
+
+               /* send processed event back to the kernel netlink socket */
+               udev_monitor_send_device(kernel_monitor, event->dev);
+
                info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
                logging_close();
                if (err != 0)
@@ -507,6 +518,11 @@ static void handle_ctrl_msg(struct udev_ctrl *uctrl)
                info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
                max_childs = i;
        }
+
+       settle_pid = udev_ctrl_get_settle(ctrl_msg);
+       if (settle_pid > 0) {
+               info(udev, "udevd message (SETTLE) received\n");
+       }
        udev_ctrl_msg_unref(ctrl_msg);
 }
 
@@ -530,20 +546,25 @@ static int handle_inotify(struct udev *udev)
 
        read(inotify_fd, buf, nbytes);
 
-       for (pos = 0, ev = (struct inotify_event *)(buf + pos); pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
-               const char *syspath;
+       for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
+               struct udev_device *dev;
 
-               dbg(udev, "inotify event: %x for %d (%s)\n", ev->mask, ev->wd, ev->len ? ev->name : "*");
+               ev = (struct inotify_event *)(buf + pos);
+               if (ev->len) {
+                       dbg(udev, "inotify event: %x for %s\n", ev->mask, ev->name);
+                       reload_config = 1;
+                       continue;
+               }
 
-               syspath = udev_watch_lookup(udev, ev->wd);
-               if (syspath != NULL) {
-                       dbg(udev, "inotify event: %x for %s\n", ev->mask, syspath);
+               dev = udev_watch_lookup(udev, ev->wd);
+               if (dev != NULL) {
+                       dbg(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
                        if (ev->mask & IN_CLOSE_WRITE) {
                                char filename[UTIL_PATH_SIZE];
                                int fd;
 
-                               info(udev, "device %s closed, synthesising 'change'\n", syspath);
-                               util_strlcpy(filename, syspath, sizeof(filename));
+                               info(udev, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
+                               util_strlcpy(filename, udev_device_get_syspath(dev), sizeof(filename));
                                util_strlcat(filename, "/uevent", sizeof(filename));
                                fd = open(filename, O_WRONLY);
                                if (fd < 0 || write(fd, "change", 6) < 0)
@@ -551,10 +572,11 @@ static int handle_inotify(struct udev *udev)
                                close(fd);
                        }
                        if (ev->mask & IN_IGNORED)
-                               udev_watch_end(udev, ev->wd);
-               } else {
-                       reload_config = 1;
+                               udev_watch_end(udev, dev);
+
+                       udev_device_unref(dev);
                }
+
        }
 
        free (buf);
@@ -791,7 +813,7 @@ int main(int argc, char *argv[])
                goto exit;
        }
 
-       kernel_monitor = udev_monitor_new_from_netlink(udev);
+       kernel_monitor = udev_monitor_new_from_netlink(udev, UDEV_MONITOR_KERNEL);
        if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
                fprintf(stderr, "error initializing netlink socket\n");
                err(udev, "error initializing netlink socket\n");
@@ -1011,6 +1033,11 @@ handle_signals:
                        if (!stop_exec_q)
                                event_queue_manager(udev);
                }
+
+               if (settle_pid > 0) {
+                       kill(settle_pid, SIGUSR1);
+                       settle_pid = 0;
+               }
        }
        cleanup_queue_dir(udev);
        rc = 0;