chiark / gitweb /
rename udev source files
[elogind.git] / udev / udevd.c
index 68cf264..1583e22 100644 (file)
@@ -1,24 +1,21 @@
 /*
- * Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
  * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
  *
- *     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 the
- *     Free Software Foundation version 2 of the License.
+ * 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
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
  *
- *     This program is distributed in the hope that it will be useful, but
- *     WITHOUT ANY WARRANTY; without even the implied warranty of
- *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- *     General Public License for more details.
- *
- *     You should have received a copy of the GNU General Public License along
- *     with this program; if not, write to the Free Software Foundation, Inc.,
- *     51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
  *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "config.h"
-
 #include <stddef.h>
 #include <signal.h>
 #include <unistd.h>
 #include <sys/wait.h>
 #include <sys/types.h>
 #include <sys/socket.h>
-#include <sys/un.h>
 #include <sys/stat.h>
 #include <sys/ioctl.h>
-#include <linux/types.h>
-#include <linux/netlink.h>
 #ifdef HAVE_INOTIFY
 #include <sys/inotify.h>
 #endif
 
 #include "udev.h"
-#include "udev_rules.h"
-#include "udevd.h"
-#include "udev_selinux.h"
+#include "udev-rules.h"
+
+#define UDEVD_PRIORITY                 -4
+#define UDEV_PRIORITY                  -2
+
+/* maximum limit of forked childs */
+#define UDEVD_MAX_CHILDS               256
 
-static int debug_trace;
 static int debug;
 
+static void log_fn(struct udev *udev, int priority,
+                  const char *file, int line, const char *fn,
+                  const char *format, va_list args)
+{
+       if (debug) {
+               fprintf(stderr, "[%d] %s: ", (int) getpid(), fn);
+               vfprintf(stderr, format, args);
+       } else {
+               vsyslog(priority, format, args);
+       }
+}
+
+static int debug_trace;
 static struct udev_rules rules;
-static int udevd_sock = -1;
-static int uevent_netlink_sock = -1;
+static struct udev_ctrl *udev_ctrl;
+static struct udev_monitor *kernel_monitor;
 static int inotify_fd = -1;
-static pid_t sid;
 
 static int signal_pipe[2] = {-1, -1};
 static volatile int sigchilds_waiting;
@@ -66,246 +75,204 @@ static volatile int reload_config;
 static int run_exec_q;
 static int stop_exec_q;
 static int max_childs;
-static int max_childs_running;
-static char udev_log[32];
 
 static LIST_HEAD(exec_list);
 static LIST_HEAD(running_list);
 
-
-#ifdef USE_LOG
-void log_message(int priority, const char *format, ...)
-{
-       va_list args;
-
-       if (priority > udev_log_priority)
-               return;
-
-       va_start(args, format);
-       if (debug) {
-               printf("[%d] ", (int) getpid());
-               vprintf(format, args);
-       } else
-               vsyslog(priority, format, args);
-       va_end(args);
-}
-
-#endif
-
-static void asmlinkage udev_event_sig_handler(int signum)
-{
-       if (signum == SIGALRM)
-               exit(1);
-}
-
-static int udev_event_process(struct udevd_uevent_msg *msg)
-{
-       struct sigaction act;
-       struct udevice *udev;
-       int i;
-       int retval;
-
-       /* set signal handlers */
-       memset(&act, 0x00, sizeof(act));
-       act.sa_handler = (void (*)(int)) udev_event_sig_handler;
-       sigemptyset (&act.sa_mask);
-       act.sa_flags = 0;
-       sigaction(SIGALRM, &act, NULL);
-
-       /* reset to default */
-       act.sa_handler = SIG_DFL;
-       sigaction(SIGINT, &act, NULL);
-       sigaction(SIGTERM, &act, NULL);
-       sigaction(SIGCHLD, &act, NULL);
-       sigaction(SIGHUP, &act, NULL);
-
-       /* trigger timeout to prevent hanging processes */
-       alarm(UDEV_EVENT_TIMEOUT);
-
-       /* reconstruct event environment from message */
-       for (i = 0; msg->envp[i]; i++)
-               putenv(msg->envp[i]);
-
-       udev = udev_device_init();
-       if (udev == NULL)
-               return -1;
-       strlcpy(udev->action, msg->action, sizeof(udev->action));
-       sysfs_device_set_values(udev->dev, msg->devpath, msg->subsystem, msg->driver);
-       udev->devpath_old = msg->devpath_old;
-       udev->devt = msg->devt;
-
-       retval = udev_device_event(&rules, udev);
-
-       /* rules may change/disable the timeout */
-       if (udev->event_timeout >= 0)
-               alarm(udev->event_timeout);
-
-       /* run programs collected by RUN-key*/
-       if (retval == 0 && !udev->ignore_device && udev_run)
-               retval = udev_rules_run(udev);
-
-       udev_device_cleanup(udev);
-       return retval;
-}
-
 enum event_state {
        EVENT_QUEUED,
        EVENT_FINISHED,
        EVENT_FAILED,
 };
 
-static void export_event_state(struct udevd_uevent_msg *msg, enum event_state state)
+static void export_event_state(struct udev_event *event, enum event_state state)
 {
-       char filename[PATH_SIZE];
-       char filename_failed[PATH_SIZE];
+       char filename[UTIL_PATH_SIZE];
+       char filename_failed[UTIL_PATH_SIZE];
        size_t start;
 
        /* location of queue file */
-       snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu", udev_root, msg->seqnum);
+       snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu",
+                udev_get_dev_path(event->udev), udev_device_get_seqnum(event->dev));
 
        /* location of failed file */
-       strlcpy(filename_failed, udev_root, sizeof(filename_failed));
-       strlcat(filename_failed, "/", sizeof(filename_failed));
-       start = strlcat(filename_failed, ".udev/failed/", sizeof(filename_failed));
-       strlcat(filename_failed, msg->devpath, sizeof(filename_failed));
-       path_encode(&filename_failed[start], sizeof(filename_failed) - start);
+       util_strlcpy(filename_failed, udev_get_dev_path(event->udev), sizeof(filename_failed));
+       util_strlcat(filename_failed, "/", sizeof(filename_failed));
+       start = util_strlcat(filename_failed, ".udev/failed/", sizeof(filename_failed));
+       util_strlcat(filename_failed, udev_device_get_devpath(event->dev), sizeof(filename_failed));
+       util_path_encode(&filename_failed[start], sizeof(filename_failed) - start);
 
        switch (state) {
        case EVENT_QUEUED:
                unlink(filename_failed);
-               delete_path(filename_failed);
-
-               create_path(filename);
-               selinux_setfscreatecon(filename, NULL, S_IFLNK);        
-               symlink(msg->devpath, filename);
-               selinux_resetfscreatecon();
+               delete_path(event->udev, filename_failed);
+               create_path(event->udev, filename);
+               udev_selinux_setfscreatecon(event->udev, filename, S_IFLNK);
+               symlink(udev_device_get_devpath(event->dev), filename);
+               udev_selinux_resetfscreatecon(event->udev);
                break;
        case EVENT_FINISHED:
-               if (msg->devpath_old != NULL) {
+               if (udev_device_get_devpath_old(event->dev) != NULL) {
                        /* "move" event - rename failed file to current name, do not delete failed */
-                       char filename_failed_old[PATH_SIZE];
+                       char filename_failed_old[UTIL_PATH_SIZE];
 
-                       strlcpy(filename_failed_old, udev_root, sizeof(filename_failed_old));
-                       strlcat(filename_failed_old, "/", sizeof(filename_failed_old));
-                       start = strlcat(filename_failed_old, ".udev/failed/", sizeof(filename_failed_old));
-                       strlcat(filename_failed_old, msg->devpath_old, sizeof(filename_failed_old));
-                       path_encode(&filename_failed_old[start], sizeof(filename) - start);
+                       util_strlcpy(filename_failed_old, udev_get_dev_path(event->udev), sizeof(filename_failed_old));
+                       util_strlcat(filename_failed_old, "/", sizeof(filename_failed_old));
+                       start = util_strlcat(filename_failed_old, ".udev/failed/", sizeof(filename_failed_old));
+                       util_strlcat(filename_failed_old, udev_device_get_devpath_old(event->dev), sizeof(filename_failed_old));
+                       util_path_encode(&filename_failed_old[start], sizeof(filename) - start);
 
                        if (rename(filename_failed_old, filename_failed) == 0)
-                               info("renamed devpath, moved failed state of '%s' to %s'\n",
-                                    msg->devpath_old, msg->devpath);
+                               info(event->udev, "renamed devpath, moved failed state of '%s' to %s'\n",
+                                    udev_device_get_devpath_old(event->dev), udev_device_get_devpath(event->dev));
                } else {
                        unlink(filename_failed);
-                       delete_path(filename_failed);
+                       delete_path(event->udev, filename_failed);
                }
 
                unlink(filename);
-               delete_path(filename);
+               delete_path(event->udev, filename);
                break;
        case EVENT_FAILED:
                /* move failed event to the failed directory */
-               create_path(filename_failed);
+               create_path(event->udev, filename_failed);
                rename(filename, filename_failed);
 
                /* clean up possibly empty queue directory */
-               delete_path(filename);
+               delete_path(event->udev, filename);
                break;
        }
 
        return;
 }
 
-static void msg_queue_delete(struct udevd_uevent_msg *msg)
+static void event_queue_delete(struct udev_event *event)
 {
-       list_del(&msg->node);
+       list_del(&event->node);
 
        /* mark as failed, if "add" event returns non-zero */
-       if (msg->exitstatus && strcmp(msg->action, "add") == 0)
-               export_event_state(msg, EVENT_FAILED);
+       if (event->exitstatus && strcmp(udev_device_get_action(event->dev), "add") == 0)
+               export_event_state(event, EVENT_FAILED);
        else
-               export_event_state(msg, EVENT_FINISHED);
+               export_event_state(event, EVENT_FINISHED);
 
-       free(msg);
+       udev_device_unref(event->dev);
+       udev_event_unref(event);
+}
+
+static void asmlinkage event_sig_handler(int signum)
+{
+       if (signum == SIGALRM)
+               exit(1);
 }
 
-static void udev_event_run(struct udevd_uevent_msg *msg)
+static void event_fork(struct udev_event *event)
 {
        pid_t pid;
-       int retval;
+       struct sigaction act;
+       int err;
 
        pid = fork();
        switch (pid) {
        case 0:
                /* child */
-               close(uevent_netlink_sock);
-               close(udevd_sock);
+               udev_monitor_unref(kernel_monitor);
+               udev_ctrl_unref(udev_ctrl);
                if (inotify_fd >= 0)
                        close(inotify_fd);
                close(signal_pipe[READ_END]);
                close(signal_pipe[WRITE_END]);
                logging_close();
-
                logging_init("udevd-event");
                setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
 
-               retval = udev_event_process(msg);
-               info("seq %llu finished with %i\n", msg->seqnum, retval);
-
+               /* set signal handlers */
+               memset(&act, 0x00, sizeof(act));
+               act.sa_handler = (void (*)(int)) event_sig_handler;
+               sigemptyset (&act.sa_mask);
+               act.sa_flags = 0;
+               sigaction(SIGALRM, &act, NULL);
+
+               /* reset to default */
+               act.sa_handler = SIG_DFL;
+               sigaction(SIGINT, &act, NULL);
+               sigaction(SIGTERM, &act, NULL);
+               sigaction(SIGCHLD, &act, NULL);
+               sigaction(SIGHUP, &act, NULL);
+
+               /* set timeout to prevent hanging processes */
+               alarm(UDEV_EVENT_TIMEOUT);
+
+               /* apply rules, create node, symlinks */
+               err = udev_event_run(event, &rules);
+
+               /* rules may change/disable the timeout */
+               if (udev_device_get_event_timeout(event->dev) >= 0)
+                       alarm(udev_device_get_event_timeout(event->dev));
+
+               /* execute RUN= */
+               if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
+                       udev_rules_run(event);
+               info(event->udev, "seq %llu finished with %i\n", udev_device_get_seqnum(event->dev), err);
                logging_close();
-               if (retval)
+               if (err != 0)
                        exit(1);
                exit(0);
        case -1:
-               err("fork of child failed: %s\n", strerror(errno));
-               msg_queue_delete(msg);
+               err(event->udev, "fork of child failed: %m\n");
+               event_queue_delete(event);
                break;
        default:
                /* get SIGCHLD in main loop */
-               info("seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
-                    msg->seqnum, pid,  msg->action, msg->subsystem, time(NULL) - msg->queue_time);
-               msg->pid = pid;
+               info(event->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
+                    udev_device_get_seqnum(event->dev),
+                    pid,
+                    udev_device_get_action(event->dev),
+                    udev_device_get_subsystem(event->dev),
+                    time(NULL) - event->queue_time);
+               event->pid = pid;
        }
 }
 
-static void msg_queue_insert(struct udevd_uevent_msg *msg)
+static void event_queue_insert(struct udev_event *event)
 {
-       char filename[PATH_SIZE];
+       char filename[UTIL_PATH_SIZE];
        int fd;
 
-       msg->queue_time = time(NULL);
+       event->queue_time = time(NULL);
 
-       export_event_state(msg, EVENT_QUEUED);
-       info("seq %llu queued, '%s' '%s'\n", msg->seqnum, msg->action, msg->subsystem);
+       export_event_state(event, EVENT_QUEUED);
+       info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(event->dev), udev_device_get_action(event->dev), udev_device_get_subsystem(event->dev));
 
-       strlcpy(filename, udev_root, sizeof(filename));
-       strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
+       util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
+       util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
        fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
        if (fd >= 0) {
                char str[32];
                int len;
 
-               len = sprintf(str, "%llu\n", msg->seqnum);
+               len = sprintf(str, "%llu\n", udev_device_get_seqnum(event->dev));
                write(fd, str, len);
                close(fd);
        }
 
        /* run one event after the other in debug mode */
        if (debug_trace) {
-               list_add_tail(&msg->node, &running_list);
-               udev_event_run(msg);
-               waitpid(msg->pid, NULL, 0);
-               msg_queue_delete(msg);
+               list_add_tail(&event->node, &running_list);
+               event_fork(event);
+               waitpid(event->pid, NULL, 0);
+               event_queue_delete(event);
                return;
        }
 
        /* run all events with a timeout set immediately */
-       if (msg->timeout != 0) {
-               list_add_tail(&msg->node, &running_list);
-               udev_event_run(msg);
+       if (udev_device_get_timeout(event->dev) > 0) {
+               list_add_tail(&event->node, &running_list);
+               event_fork(event);
                return;
        }
 
-       list_add_tail(&msg->node, &exec_list);
+       list_add_tail(&event->node, &exec_list);
        run_exec_q = 1;
 }
 
@@ -332,119 +299,11 @@ static int mem_size_mb(void)
        return memsize;
 }
 
-static int cpu_count(void)
-{
-       FILE* f;
-       char buf[4096];
-       int count = 0;
-
-       f = fopen("/proc/stat", "r");
-       if (f == NULL)
-               return -1;
-
-       while (fgets(buf, sizeof(buf), f) != NULL) {
-               if (strncmp(buf, "cpu", 3) == 0 && isdigit(buf[3]))
-                       count++;
-       }
-
-       fclose(f);
-       if (count == 0)
-               return -1;
-       return count;
-}
-
-static int running_processes(void)
-{
-       FILE* f;
-       char buf[4096];
-       int running = -1;
-
-       f = fopen("/proc/stat", "r");
-       if (f == NULL)
-               return -1;
-
-       while (fgets(buf, sizeof(buf), f) != NULL) {
-               int value;
-
-               if (sscanf(buf, "procs_running %u", &value) == 1) {
-                       running = value;
-                       break;
-               }
-       }
-
-       fclose(f);
-       return running;
-}
-
-/* return the number of process es in our session, count only until limit */
-static int running_processes_in_session(pid_t session, int limit)
-{
-       DIR *dir;
-       struct dirent *dent;
-       int running = 0;
-
-       dir = opendir("/proc");
-       if (!dir)
-               return -1;
-
-       /* read process info from /proc */
-       for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
-               int f;
-               char procdir[64];
-               char line[256];
-               const char *pos;
-               char state;
-               pid_t ppid, pgrp, sess;
-               int len;
-
-               if (!isdigit(dent->d_name[0]))
-                       continue;
-
-               snprintf(procdir, sizeof(procdir), "/proc/%s/stat", dent->d_name);
-               procdir[sizeof(procdir)-1] = '\0';
-
-               f = open(procdir, O_RDONLY);
-               if (f == -1)
-                       continue;
-
-               len = read(f, line, sizeof(line)-1);
-               close(f);
-
-               if (len <= 0)
-                       continue;
-               else
-                       line[len] = '\0';
-
-               /* skip ugly program name */
-               pos = strrchr(line, ')') + 2;
-               if (pos == NULL)
-                       continue;
-
-               if (sscanf(pos, "%c %d %d %d ", &state, &ppid, &pgrp, &sess) != 4)
-                       continue;
-
-               /* count only processes in our session */
-               if (sess != session)
-                       continue;
-
-               /* count only running, no sleeping processes */
-               if (state != 'R')
-                       continue;
-
-               running++;
-               if (limit > 0 && running >= limit)
-                       break;
-       }
-       closedir(dir);
-
-       return running;
-}
-
 static int compare_devpath(const char *running, const char *waiting)
 {
        int i;
 
-       for (i = 0; i < PATH_SIZE; i++) {
+       for (i = 0; i < UTIL_PATH_SIZE; i++) {
                /* identical device event found */
                if (running[i] == '\0' && waiting[i] == '\0')
                        return 1;
@@ -466,78 +325,99 @@ static int compare_devpath(const char *running, const char *waiting)
 }
 
 /* lookup event for identical, parent, child, or physical device */
-static int devpath_busy(struct udevd_uevent_msg *msg, int limit)
+static int devpath_busy(struct udev_event *event, int limit)
 {
-       struct udevd_uevent_msg *loop_msg;
+       struct udev_event *loop_event;
        int childs_count = 0;
 
        /* check exec-queue which may still contain delayed events we depend on */
-       list_for_each_entry(loop_msg, &exec_list, node) {
+       list_for_each_entry(loop_event, &exec_list, node) {
                /* skip ourself and all later events */
-               if (loop_msg->seqnum >= msg->seqnum)
+               if (udev_device_get_seqnum(loop_event->dev) >= udev_device_get_seqnum(event->dev))
                        break;
 
                /* check our old name */
-               if (msg->devpath_old != NULL)
-                       if (strcmp(loop_msg->devpath , msg->devpath_old) == 0)
+               if (udev_device_get_devpath_old(event->dev) != NULL)
+                       if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0)
                                return 2;
 
                /* check identical, parent, or child device event */
-               if (compare_devpath(loop_msg->devpath, msg->devpath) != 0) {
-                       dbg("%llu, device event still pending %llu (%s)\n",
-                           msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
+               if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
+                       dbg(event->udev, "%llu, device event still pending %llu (%s)\n",
+                           udev_device_get_seqnum(event->dev),
+                           udev_device_get_seqnum(loop_event->dev),
+                           udev_device_get_devpath(loop_event->dev));
                        return 3;
                }
 
                /* check for our major:minor number */
-               if (msg->devt && loop_msg->devt == msg->devt &&
-                   strcmp(msg->subsystem, loop_msg->subsystem) == 0) {
-                       dbg("%llu, device event still pending %llu (%d:%d)\n", msg->seqnum,
-                           loop_msg->seqnum, major(loop_msg->devt), minor(loop_msg->devt));
+               if (major(udev_device_get_devnum(event->dev)) > 0 &&
+                   udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
+                   strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
+                       dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
+                           udev_device_get_seqnum(event->dev),
+                           udev_device_get_seqnum(loop_event->dev),
+                           major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
                        return 4;
                }
 
                /* check physical device event (special case of parent) */
-               if (msg->physdevpath && msg->action && strcmp(msg->action, "add") == 0)
-                       if (compare_devpath(loop_msg->devpath, msg->physdevpath) != 0) {
-                               dbg("%llu, physical device event still pending %llu (%s)\n",
-                                   msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
+               if (udev_device_get_physdevpath(event->dev) != NULL &&
+                   strcmp(udev_device_get_action(event->dev), "add") == 0)
+                       if (compare_devpath(udev_device_get_devpath(loop_event->dev),
+                                           udev_device_get_physdevpath(event->dev)) != 0) {
+                               dbg(event->udev, "%llu, physical device event still pending %llu (%s)\n",
+                                   udev_device_get_seqnum(event->dev),
+                                   udev_device_get_seqnum(loop_event->dev),
+                                   udev_device_get_devpath(loop_event->dev));
                                return 5;
                        }
        }
 
        /* check run queue for still running events */
-       list_for_each_entry(loop_msg, &running_list, node) {
-               if (limit && childs_count++ > limit) {
-                       dbg("%llu, maximum number (%i) of childs reached\n", msg->seqnum, childs_count);
+       list_for_each_entry(loop_event, &running_list, node) {
+               childs_count++;
+
+               if (childs_count++ >= limit) {
+                       info(event->udev, "%llu, maximum number (%i) of childs reached\n",
+                            udev_device_get_seqnum(event->dev), childs_count);
                        return 1;
                }
 
                /* check our old name */
-               if (msg->devpath_old != NULL)
-                       if (strcmp(loop_msg->devpath , msg->devpath_old) == 0)
+               if (udev_device_get_devpath_old(event->dev) != NULL)
+                       if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0)
                                return 2;
 
                /* check identical, parent, or child device event */
-               if (compare_devpath(loop_msg->devpath, msg->devpath) != 0) {
-                       dbg("%llu, device event still running %llu (%s)\n",
-                           msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
+               if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
+                       dbg(event->udev, "%llu, device event still running %llu (%s)\n",
+                           udev_device_get_seqnum(event->dev),
+                           udev_device_get_seqnum(loop_event->dev),
+                           udev_device_get_devpath(loop_event->dev));
                        return 3;
                }
 
                /* check for our major:minor number */
-               if (msg->devt && loop_msg->devt == msg->devt &&
-                   strcmp(msg->subsystem, loop_msg->subsystem) == 0) {
-                       dbg("%llu, device event still running %llu (%d:%d)\n", msg->seqnum,
-                           loop_msg->seqnum, major(loop_msg->devt), minor(loop_msg->devt));
+               if (major(udev_device_get_devnum(event->dev)) > 0 &&
+                   udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
+                   strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
+                       dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
+                           udev_device_get_seqnum(event->dev),
+                           udev_device_get_seqnum(loop_event->dev),
+                           major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
                        return 4;
                }
 
                /* check physical device event (special case of parent) */
-               if (msg->physdevpath && msg->action && strcmp(msg->action, "add") == 0)
-                       if (compare_devpath(loop_msg->devpath, msg->physdevpath) != 0) {
-                               dbg("%llu, physical device event still running %llu (%s)\n",
-                                   msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
+               if (udev_device_get_physdevpath(event->dev) != NULL &&
+                   strcmp(udev_device_get_action(event->dev), "add") == 0)
+                       if (compare_devpath(udev_device_get_devpath(loop_event->dev),
+                                           udev_device_get_physdevpath(event->dev)) != 0) {
+                               dbg(event->udev, "%llu, physical device event still pending %llu (%s)\n",
+                                   udev_device_get_seqnum(event->dev),
+                                   udev_device_get_seqnum(loop_event->dev),
+                                   udev_device_get_devpath(loop_event->dev));
                                return 5;
                        }
        }
@@ -545,258 +425,97 @@ static int devpath_busy(struct udevd_uevent_msg *msg, int limit)
 }
 
 /* serializes events for the identical and parent and child devices */
-static void msg_queue_manager(void)
+static void event_queue_manager(struct udev *udev)
 {
-       struct udevd_uevent_msg *loop_msg;
-       struct udevd_uevent_msg *tmp_msg;
-       int running;
+       struct udev_event *loop_event;
+       struct udev_event *tmp_event;
 
        if (list_empty(&exec_list))
                return;
 
-       running = running_processes();
-       dbg("%d processes runnning on system\n", running);
-       if (running < 0)
-               running = max_childs_running;
-
-       list_for_each_entry_safe(loop_msg, tmp_msg, &exec_list, node) {
-               /* check running processes in our session and possibly throttle */
-               if (running >= max_childs_running) {
-                       running = running_processes_in_session(sid, max_childs_running+10);
-                       dbg("at least %d processes running in session\n", running);
-                       if (running >= max_childs_running) {
-                               dbg("delay seq %llu, too many processes already running\n", loop_msg->seqnum);
-                               return;
-                       }
-               }
-
+       list_for_each_entry_safe(loop_event, tmp_event, &exec_list, node) {
                /* serialize and wait for parent or child events */
-               if (devpath_busy(loop_msg, max_childs) != 0) {
-                       dbg("delay seq %llu (%s)\n", loop_msg->seqnum, loop_msg->devpath);
+               if (devpath_busy(loop_event, max_childs) != 0) {
+                       dbg(udev, "delay seq %llu (%s)\n",
+                           udev_device_get_seqnum(loop_event->dev),
+                           udev_device_get_devpath(loop_event->dev));
                        continue;
                }
 
                /* move event to run list */
-               list_move_tail(&loop_msg->node, &running_list);
-               udev_event_run(loop_msg);
-               running++;
-               dbg("moved seq %llu to running list\n", loop_msg->seqnum);
-       }
-}
-
-static struct udevd_uevent_msg *get_msg_from_envbuf(const char *buf, int buf_size)
-{
-       int bufpos;
-       int i;
-       struct udevd_uevent_msg *msg;
-       char *physdevdriver_key = NULL;
-       int maj = 0;
-       int min = 0;
-
-       msg = malloc(sizeof(struct udevd_uevent_msg) + buf_size);
-       if (msg == NULL)
-               return NULL;
-       memset(msg, 0x00, sizeof(struct udevd_uevent_msg) + buf_size);
-
-       /* copy environment buffer and reconstruct envp */
-       memcpy(msg->envbuf, buf, buf_size);
-       bufpos = 0;
-       for (i = 0; (bufpos < buf_size) && (i < UEVENT_NUM_ENVP-2); i++) {
-               int keylen;
-               char *key;
-
-               key = &msg->envbuf[bufpos];
-               keylen = strlen(key);
-               msg->envp[i] = key;
-               bufpos += keylen + 1;
-               dbg("add '%s' to msg.envp[%i]\n", msg->envp[i], i);
-
-               /* remember some keys for further processing */
-               if (strncmp(key, "ACTION=", 7) == 0)
-                       msg->action = &key[7];
-               else if (strncmp(key, "DEVPATH=", 8) == 0)
-                       msg->devpath = &key[8];
-               else if (strncmp(key, "SUBSYSTEM=", 10) == 0)
-                       msg->subsystem = &key[10];
-               else if (strncmp(key, "DRIVER=", 7) == 0)
-                       msg->driver = &key[7];
-               else if (strncmp(key, "SEQNUM=", 7) == 0)
-                       msg->seqnum = strtoull(&key[7], NULL, 10);
-               else if (strncmp(key, "DEVPATH_OLD=", 12) == 0)
-                       msg->devpath_old = &key[12];
-               else if (strncmp(key, "PHYSDEVPATH=", 12) == 0)
-                       msg->physdevpath = &key[12];
-               else if (strncmp(key, "PHYSDEVDRIVER=", 14) == 0)
-                       physdevdriver_key = key;
-               else if (strncmp(key, "MAJOR=", 6) == 0)
-                       maj = strtoull(&key[6], NULL, 10);
-               else if (strncmp(key, "MINOR=", 6) == 0)
-                       min = strtoull(&key[6], NULL, 10);
-               else if (strncmp(key, "TIMEOUT=", 8) == 0)
-                       msg->timeout = strtoull(&key[8], NULL, 10);
-       }
-       msg->devt = makedev(maj, min);
-       msg->envp[i++] = "UDEVD_EVENT=1";
-
-       if (msg->driver == NULL && msg->physdevpath == NULL && physdevdriver_key != NULL) {
-               /* for older kernels DRIVER is empty for a bus device, export PHYSDEVDRIVER as DRIVER */
-               msg->envp[i++] = &physdevdriver_key[7];
-               msg->driver = &physdevdriver_key[14];
-       }
-
-       msg->envp[i] = NULL;
-
-       if (msg->devpath == NULL || msg->action == NULL) {
-               info("DEVPATH or ACTION missing, ignore message\n");
-               free(msg);
-               return NULL;
+               list_move_tail(&loop_event->node, &running_list);
+               event_fork(loop_event);
+               dbg(udev, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event->dev));
        }
-       return msg;
 }
 
 /* receive the udevd message from userspace */
-static void get_ctrl_msg(void)
+static void handle_ctrl_msg(struct udev_ctrl *uctrl)
 {
-       struct udevd_ctrl_msg ctrl_msg;
-       ssize_t size;
-       struct msghdr smsg;
-       struct cmsghdr *cmsg;
-       struct iovec iov;
-       struct ucred *cred;
-       char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
-       char *pos;
-
-       memset(&ctrl_msg, 0x00, sizeof(struct udevd_ctrl_msg));
-       iov.iov_base = &ctrl_msg;
-       iov.iov_len = sizeof(struct udevd_ctrl_msg);
-
-       memset(&smsg, 0x00, sizeof(struct msghdr));
-       smsg.msg_iov = &iov;
-       smsg.msg_iovlen = 1;
-       smsg.msg_control = cred_msg;
-       smsg.msg_controllen = sizeof(cred_msg);
-
-       size = recvmsg(udevd_sock, &smsg, 0);
-       if (size <  0) {
-               if (errno != EINTR)
-                       err("unable to receive user udevd message: %s\n", strerror(errno));
-               return;
-       }
-       cmsg = CMSG_FIRSTHDR(&smsg);
-       cred = (struct ucred *) CMSG_DATA(cmsg);
+       struct udev *udev = udev_ctrl_get_udev(uctrl);
+       struct udev_ctrl_msg *ctrl_msg;
+       const char *str;
+       int i;
 
-       if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
-               err("no sender credentials received, message ignored\n");
+       ctrl_msg = udev_ctrl_receive_msg(uctrl);
+       if (ctrl_msg == NULL)
                return;
-       }
 
-       if (cred->uid != 0) {
-               err("sender uid=%i, message ignored\n", cred->uid);
-               return;
+       i = udev_ctrl_get_set_log_level(ctrl_msg);
+       if (i >= 0) {
+               info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
+               udev_set_log_priority(udev, i);
        }
 
-       if (strncmp(ctrl_msg.magic, UDEVD_CTRL_MAGIC, sizeof(UDEVD_CTRL_MAGIC)) != 0 ) {
-               err("message magic '%s' doesn't match, ignore it\n", ctrl_msg.magic);
-               return;
+       if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
+               info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
+               stop_exec_q = 1;
        }
 
-       switch (ctrl_msg.type) {
-       case UDEVD_CTRL_ENV:
-               pos = strchr(ctrl_msg.buf, '=');
-               if (pos == NULL) {
-                       err("wrong key format '%s'\n", ctrl_msg.buf);
-                       break;
-               }
-               pos[0] = '\0';
-               if (pos[1] == '\0') {
-                       info("udevd message (ENV) received, unset '%s'\n", ctrl_msg.buf);
-                       unsetenv(ctrl_msg.buf);
-               } else {
-                       info("udevd message (ENV) received, set '%s=%s'\n", ctrl_msg.buf, &pos[1]);
-                       setenv(ctrl_msg.buf, &pos[1], 1);
-               }
-               break;
-       case UDEVD_CTRL_STOP_EXEC_QUEUE:
-               info("udevd message (STOP_EXEC_QUEUE) received\n");
-               stop_exec_q = 1;
-               break;
-       case UDEVD_CTRL_START_EXEC_QUEUE:
-               info("udevd message (START_EXEC_QUEUE) received\n");
+       if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
+               info(udev, "udevd message (START_EXEC_QUEUE) received\n");
                stop_exec_q = 0;
-               msg_queue_manager();
-               break;
-       case UDEVD_CTRL_SET_LOG_LEVEL:
-               info("udevd message (SET_LOG_PRIORITY) received, udev_log_priority=%i\n", ctrl_msg.intval);
-               udev_log_priority =  ctrl_msg.intval;
-               sprintf(udev_log, "UDEV_LOG=%i", udev_log_priority);
-               putenv(udev_log);
-               break;
-       case UDEVD_CTRL_SET_MAX_CHILDS:
-               info("udevd message (UDEVD_SET_MAX_CHILDS) received, max_childs=%i\n", ctrl_msg.intval);
-               max_childs = ctrl_msg.intval;
-               break;
-       case UDEVD_CTRL_SET_MAX_CHILDS_RUNNING:
-               info("udevd message (UDEVD_SET_MAX_CHILDS_RUNNING) received, max_childs_running=%i\n", ctrl_msg.intval);
-               max_childs_running = ctrl_msg.intval;
-               break;
-       case UDEVD_CTRL_RELOAD_RULES:
-               info("udevd message (RELOAD_RULES) received\n");
-               reload_config = 1;
-               break;
-       default:
-               err("unknown control message type\n");
+               event_queue_manager(udev);
        }
-}
 
-/* receive the kernel user event message and do some sanity checks */
-static struct udevd_uevent_msg *get_netlink_msg(void)
-{
-       struct udevd_uevent_msg *msg;
-       int bufpos;
-       ssize_t size;
-       static char buffer[UEVENT_BUFFER_SIZE+512];
-       char *pos;
-
-       size = recv(uevent_netlink_sock, &buffer, sizeof(buffer), 0);
-       if (size <  0) {
-               if (errno != EINTR)
-                       err("unable to receive kernel netlink message: %s\n", strerror(errno));
-               return NULL;
+       if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
+               info(udev, "udevd message (RELOAD_RULES) received\n");
+               reload_config = 1;
        }
 
-       if ((size_t)size > sizeof(buffer)-1)
-               size = sizeof(buffer)-1;
-       buffer[size] = '\0';
-       dbg("uevent_size=%zi\n", size);
-
-       /* start of event payload */
-       bufpos = strlen(buffer)+1;
-       msg = get_msg_from_envbuf(&buffer[bufpos], size-bufpos);
-       if (msg == NULL)
-               return NULL;
-
-       /* validate message */
-       pos = strchr(buffer, '@');
-       if (pos == NULL) {
-               err("invalid uevent '%s'\n", buffer);
-               free(msg);
-               return NULL;
-       }
-       pos[0] = '\0';
+       str = udev_ctrl_get_set_env(ctrl_msg);
+       if (str != NULL) {
+               char *key;
 
-       if (msg->action == NULL) {
-               info("no ACTION in payload found, skip event '%s'\n", buffer);
-               free(msg);
-               return NULL;
+               key = strdup(str);
+               if (key != NULL) {
+                       char *val;
+
+                       val = strchr(key, '=');
+                       if (val != NULL) {
+                               val[0] = '\0';
+                               val = &val[1];
+                               if (val[0] == '\0') {
+                                       info(udev, "udevd message (ENV) received, unset '%s'\n", key);
+                                       udev_add_property(udev, key, NULL);
+                               } else {
+                                       info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
+                                       udev_add_property(udev, key, val);
+                               }
+                       } else {
+                               err(udev, "wrong key format '%s'\n", key);
+                       }
+                       free(key);
+               }
        }
 
-       if (strcmp(msg->action, buffer) != 0) {
-               err("ACTION in payload does not match uevent, skip event '%s'\n", buffer);
-               free(msg);
-               return NULL;
+       i = udev_ctrl_get_set_max_childs(ctrl_msg);
+       if (i >= 0) {
+               info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
+               max_childs = i;
        }
 
-       return msg;
+       udev_ctrl_msg_unref(ctrl_msg);
 }
 
 static void asmlinkage sig_handler(int signum)
@@ -821,15 +540,16 @@ static void asmlinkage sig_handler(int signum)
 
 static void udev_done(int pid, int exitstatus)
 {
-       /* find msg associated with pid and delete it */
-       struct udevd_uevent_msg *msg;
+       /* find event associated with pid and delete it */
+       struct udev_event *event;
 
-       list_for_each_entry(msg, &running_list, node) {
-               if (msg->pid == pid) {
-                       info("seq %llu, pid [%d] exit with %i, %ld seconds old\n", msg->seqnum, msg->pid,
-                            exitstatus, time(NULL) - msg->queue_time);
-                       msg->exitstatus = exitstatus;
-                       msg_queue_delete(msg);
+       list_for_each_entry(event, &running_list, node) {
+               if (event->pid == pid) {
+                       info(event->udev, "seq %llu, pid [%d] exit with %i, %ld seconds old\n",
+                            udev_device_get_seqnum(event->dev), event->pid,
+                            exitstatus, time(NULL) - event->queue_time);
+                       event->exitstatus = exitstatus;
+                       event_queue_delete(event);
 
                        /* there may be events waiting with the same devpath */
                        run_exec_q = 1;
@@ -857,81 +577,15 @@ static void reap_sigchilds(void)
        }
 }
 
-static int init_udevd_socket(void)
-{
-       struct sockaddr_un saddr;
-       socklen_t addrlen;
-       const int feature_on = 1;
-       int retval;
-
-       memset(&saddr, 0x00, sizeof(saddr));
-       saddr.sun_family = AF_LOCAL;
-       strcpy(saddr.sun_path, UDEVD_CTRL_SOCK_PATH);
-       addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path);
-       /* translate leading '@' to abstract namespace */
-       if (saddr.sun_path[0] == '@')
-               saddr.sun_path[0] = '\0';
-
-       udevd_sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
-       if (udevd_sock == -1) {
-               err("error getting socket: %s\n", strerror(errno));
-               return -1;
-       }
-
-       /* the bind takes care of ensuring only one copy running */
-       retval = bind(udevd_sock, (struct sockaddr *) &saddr, addrlen);
-       if (retval < 0) {
-               err("bind failed: %s\n", strerror(errno));
-               close(udevd_sock);
-               udevd_sock = -1;
-               return -1;
-       }
-
-       /* enable receiving of the sender credentials */
-       setsockopt(udevd_sock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
-
-       return 0;
-}
-
-static int init_uevent_netlink_sock(void)
-{
-       struct sockaddr_nl snl;
-       const int buffersize = 16 * 1024 * 1024;
-       int retval;
-
-       memset(&snl, 0x00, sizeof(struct sockaddr_nl));
-       snl.nl_family = AF_NETLINK;
-       snl.nl_pid = getpid();
-       snl.nl_groups = 1;
-
-       uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
-       if (uevent_netlink_sock == -1) {
-               err("error getting socket: %s\n", strerror(errno));
-               return -1;
-       }
-
-       /* set receive buffersize */
-       setsockopt(uevent_netlink_sock, SOL_SOCKET, SO_RCVBUFFORCE, &buffersize, sizeof(buffersize));
-
-       retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl, sizeof(struct sockaddr_nl));
-       if (retval < 0) {
-               err("bind failed: %s\n", strerror(errno));
-               close(uevent_netlink_sock);
-               uevent_netlink_sock = -1;
-               return -1;
-       }
-       return 0;
-}
-
-static void export_initial_seqnum(void)
+static void export_initial_seqnum(struct udev *udev)
 {
-       char filename[PATH_SIZE];
+       char filename[UTIL_PATH_SIZE];
        int fd;
        char seqnum[32];
        ssize_t len = 0;
 
-       strlcpy(filename, sysfs_path, sizeof(filename));
-       strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
+       util_strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
+       util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
        fd = open(filename, O_RDONLY);
        if (fd >= 0) {
                len = read(fd, seqnum, sizeof(seqnum)-1);
@@ -941,9 +595,9 @@ static void export_initial_seqnum(void)
                strcpy(seqnum, "0\n");
                len = 3;
        }
-       strlcpy(filename, udev_root, sizeof(filename));
-       strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
-       create_path(filename);
+       util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
+       util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
+       create_path(udev, filename);
        fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
        if (fd >= 0) {
                write(fd, seqnum, len);
@@ -953,30 +607,36 @@ static void export_initial_seqnum(void)
 
 int main(int argc, char *argv[])
 {
-       int retval;
+       struct udev *udev;
+       int err;
        int fd;
        struct sigaction act;
        fd_set readfds;
        const char *value;
        int daemonize = 0;
-       int option;
        static const struct option options[] = {
-               { "daemon", 0, NULL, 'd' },
-               { "debug-trace", 0, NULL, 't' },
-               { "debug", 0, NULL, 'D' },
-               { "help", 0, NULL, 'h' },
-               { "version", 0, NULL, 'V' },
+               { "daemon", no_argument, NULL, 'd' },
+               { "debug-trace", no_argument, NULL, 't' },
+               { "debug", no_argument, NULL, 'D' },
+               { "help", no_argument, NULL, 'h' },
+               { "version", no_argument, NULL, 'V' },
                {}
        };
        int rc = 1;
        int maxfd;
 
+       udev = udev_new();
+       if (udev == NULL)
+               goto exit;
+
        logging_init("udevd");
-       udev_config_init();
-       selinux_init();
-       dbg("version %s\n", VERSION);
+       udev_set_log_fn(udev, log_fn);
+       info(udev, "version %s\n", VERSION);
+       selinux_init(udev);
 
        while (1) {
+               int option;
+
                option = getopt_long(argc, argv, "dDthV", options, NULL);
                if (option == -1)
                        break;
@@ -990,8 +650,8 @@ int main(int argc, char *argv[])
                        break;
                case 'D':
                        debug = 1;
-                       if (udev_log_priority < LOG_INFO)
-                               udev_log_priority = LOG_INFO;
+                       if (udev_get_log_priority(udev) < LOG_INFO)
+                               udev_set_log_priority(udev, LOG_INFO);
                        break;
                case 'h':
                        printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] [--version]\n");
@@ -1006,7 +666,7 @@ int main(int argc, char *argv[])
 
        if (getuid() != 0) {
                fprintf(stderr, "root privileges required\n");
-               err("root privileges required\n");
+               err(udev, "root privileges required\n");
                goto exit;
        }
 
@@ -1014,7 +674,7 @@ int main(int argc, char *argv[])
        fd = open("/dev/null", O_RDWR);
        if (fd < 0) {
                fprintf(stderr, "cannot open /dev/null\n");
-               err("cannot open /dev/null\n");
+               err(udev, "cannot open /dev/null\n");
        }
        if (fd > STDIN_FILENO)
                dup2(fd, STDIN_FILENO);
@@ -1023,61 +683,66 @@ int main(int argc, char *argv[])
        if (write(STDERR_FILENO, 0, 0) < 0)
                dup2(fd, STDERR_FILENO);
 
-       /* init sockets to receive events */
-       if (init_udevd_socket() < 0) {
-               if (errno == EADDRINUSE) {
-                       fprintf(stderr, "another udev daemon already running\n");
-                       err("another udev daemon already running\n");
-                       rc = 1;
-               } else {
-                       fprintf(stderr, "error initializing udevd socket\n");
-                       err("error initializing udevd socket\n");
-                       rc = 2;
-               }
+       /* init control socket, bind() ensures, that only one udevd instance is running */
+       udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
+       if (udev_ctrl == NULL) {
+               fprintf(stderr, "error initializing control socket");
+               err(udev, "error initializing udevd socket");
+               rc = 1;
                goto exit;
        }
 
-       if (init_uevent_netlink_sock() < 0) {
+       if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
+               fprintf(stderr, "error binding control socket, seems udevd is already running\n");
+               err(udev, "error binding control socket, seems udevd is already running\n");
+               rc = 1;
+               goto exit;
+       }
+
+       kernel_monitor = udev_monitor_new_from_netlink(udev);
+       if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
                fprintf(stderr, "error initializing netlink socket\n");
-               err("error initializing netlink socket\n");
+               err(udev, "error initializing netlink socket\n");
                rc = 3;
                goto exit;
+       } else {
+               /* set receive buffersize */
+               const int buffersize = 32 * 1024 * 1024;
+
+               setsockopt(udev_monitor_get_fd(kernel_monitor),
+                          SOL_SOCKET, SO_RCVBUFFORCE, &buffersize, sizeof(buffersize));
        }
 
-       /* setup signal handler pipe */
-       retval = pipe(signal_pipe);
-       if (retval < 0) {
-               err("error getting pipes: %s\n", strerror(errno));
+       err = pipe(signal_pipe);
+       if (err < 0) {
+               err(udev, "error getting pipes: %m\n");
                goto exit;
        }
 
-       retval = fcntl(signal_pipe[READ_END], F_GETFL, 0);
-       if (retval < 0) {
-               err("error fcntl on read pipe: %s\n", strerror(errno));
+       err = fcntl(signal_pipe[READ_END], F_GETFL, 0);
+       if (err < 0) {
+               err(udev, "error fcntl on read pipe: %m\n");
                goto exit;
        }
-       retval = fcntl(signal_pipe[READ_END], F_SETFL, retval | O_NONBLOCK);
-       if (retval < 0) {
-               err("error fcntl on read pipe: %s\n", strerror(errno));
+       err = fcntl(signal_pipe[READ_END], F_SETFL, err | O_NONBLOCK);
+       if (err < 0) {
+               err(udev, "error fcntl on read pipe: %m\n");
                goto exit;
        }
 
-       retval = fcntl(signal_pipe[WRITE_END], F_GETFL, 0);
-       if (retval < 0) {
-               err("error fcntl on write pipe: %s\n", strerror(errno));
+       err = fcntl(signal_pipe[WRITE_END], F_GETFL, 0);
+       if (err < 0) {
+               err(udev, "error fcntl on write pipe: %m\n");
                goto exit;
        }
-       retval = fcntl(signal_pipe[WRITE_END], F_SETFL, retval | O_NONBLOCK);
-       if (retval < 0) {
-               err("error fcntl on write pipe: %s\n", strerror(errno));
+       err = fcntl(signal_pipe[WRITE_END], F_SETFL, err | O_NONBLOCK);
+       if (err < 0) {
+               err(udev, "error fcntl on write pipe: %m\n");
                goto exit;
        }
 
-       /* parse the rules and keep them in memory */
-       sysfs_init();
-       udev_rules_init(&rules, 1);
-
-       export_initial_seqnum();
+       udev_rules_init(udev, &rules, 1);
+       export_initial_seqnum(udev);
 
        if (daemonize) {
                pid_t pid;
@@ -1085,23 +750,24 @@ int main(int argc, char *argv[])
                pid = fork();
                switch (pid) {
                case 0:
-                       dbg("daemonized fork running\n");
+                       dbg(udev, "daemonized fork running\n");
                        break;
                case -1:
-                       err("fork of daemon failed: %s\n", strerror(errno));
+                       err(udev, "fork of daemon failed: %m\n");
                        rc = 4;
                        goto exit;
                default:
-                       dbg("child [%u] running, parent exits\n", pid);
+                       dbg(udev, "child [%u] running, parent exits\n", pid);
                        rc = 0;
                        goto exit;
                }
        }
 
-       /* redirect std{out,err} fd's */
-       if (!debug)
+       /* redirect std{out,err} */
+       if (!debug) {
                dup2(fd, STDOUT_FILENO);
-       dup2(fd, STDERR_FILENO);
+               dup2(fd, STDERR_FILENO);
+       }
        if (fd > STDERR_FILENO)
                close(fd);
 
@@ -1110,15 +776,12 @@ int main(int argc, char *argv[])
 
        chdir("/");
        umask(022);
-
-       /* become session leader */
-       sid = setsid();
-       dbg("our session is %d\n", sid);
+       setsid();
 
        /* OOM_DISABLE == -17 */
        fd = open("/proc/self/oom_adj", O_RDWR);
        if (fd < 0)
-               err("error disabling OOM: %s\n", strerror(errno));
+               err(udev, "error disabling OOM: %m\n");
        else {
                write(fd, "-17", 3);
                close(fd);
@@ -1126,9 +789,22 @@ int main(int argc, char *argv[])
 
        fd = open("/dev/kmsg", O_WRONLY);
        if (fd > 0) {
-               const char *str = "<6>udevd version " VERSION " started\n";
-
-               write(fd, str, strlen(str));
+               const char *ver_str = "<6>udev: starting version " VERSION "\n";
+               char path[UTIL_PATH_SIZE];
+               struct stat statbuf;
+
+               write(fd, ver_str, strlen(ver_str));
+               util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
+               util_strlcat(path, "/class/mem/null", sizeof(path));
+               if (lstat(path, &statbuf) == 0) {
+                       if (S_ISDIR(statbuf.st_mode)) {
+                               const char *depr_str = "<6>udev: deprecated sysfs layout (kernel too old, "
+                                                       "or CONFIG_SYSFS_DEPRECATED) is unsupported, some "
+                                                       "udev features may fail\n";
+
+                               write(fd, depr_str, strlen(depr_str));
+                       }
+               }
                close(fd);
        }
 
@@ -1145,8 +821,8 @@ int main(int argc, char *argv[])
        /* watch rules directory */
        inotify_fd = inotify_init();
        if (inotify_fd >= 0) {
-               if (udev_rules_dir[0] != '\0') {
-                       inotify_add_watch(inotify_fd, udev_rules_dir,
+               if (udev_get_rules_path(udev) != NULL) {
+                       inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
                                          IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
                } else {
                        char filename[PATH_MAX];
@@ -1157,15 +833,15 @@ int main(int argc, char *argv[])
                                          IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
 
                        /* watch dynamic rules directory */
-                       strlcpy(filename, udev_root, sizeof(filename));
-                       strlcat(filename, "/.udev/rules.d", sizeof(filename));
+                       util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
+                       util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
                        inotify_add_watch(inotify_fd, filename,
                                          IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
                }
        } else if (errno == ENOSYS)
-               err("the kernel does not support inotify, udevd can't monitor rules file changes\n");
+               err(udev, "the kernel does not support inotify, udevd can't monitor rules file changes\n");
        else
-               err("inotify_init failed: %s\n", strerror(errno));
+               err(udev, "inotify_init failed: %m\n");
 
        /* maximum limit of forked childs */
        value = getenv("UDEVD_MAX_CHILDS");
@@ -1178,62 +854,48 @@ int main(int argc, char *argv[])
                else
                        max_childs = UDEVD_MAX_CHILDS;
        }
-       info("initialize max_childs to %u\n", max_childs);
-
-       /* start to throttle forking if maximum number of _running_ childs is reached */
-       value = getenv("UDEVD_MAX_CHILDS_RUNNING");
-       if (value)
-               max_childs_running = strtoull(value, NULL, 10);
-       else {
-               int cpus = cpu_count();
-               if (cpus > 0)
-                       max_childs_running = 8 + (8 * cpus);
-               else
-                       max_childs_running = UDEVD_MAX_CHILDS_RUNNING;
-       }
-       info("initialize max_childs_running to %u\n", max_childs_running);
-
-       /* clear environment for forked event processes */
-       clearenv();
+       info(udev, "initialize max_childs to %u\n", max_childs);
 
-       /* export log_priority , as called programs may want to follow that setting */
-       sprintf(udev_log, "UDEV_LOG=%i", udev_log_priority);
-       putenv(udev_log);
-       if (debug_trace)
-               putenv("DEBUG=1");
-
-       maxfd = udevd_sock;
-       maxfd = UDEV_MAX(maxfd, uevent_netlink_sock);
+       maxfd = udev_ctrl_get_fd(udev_ctrl);
+       maxfd = UDEV_MAX(maxfd, udev_monitor_get_fd(kernel_monitor));
        maxfd = UDEV_MAX(maxfd, signal_pipe[READ_END]);
        maxfd = UDEV_MAX(maxfd, inotify_fd);
 
        while (!udev_exit) {
-               struct udevd_uevent_msg *msg;
                int fdcount;
 
                FD_ZERO(&readfds);
                FD_SET(signal_pipe[READ_END], &readfds);
-               FD_SET(udevd_sock, &readfds);
-               FD_SET(uevent_netlink_sock, &readfds);
+               FD_SET(udev_ctrl_get_fd(udev_ctrl), &readfds);
+               FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds);
                if (inotify_fd >= 0)
                        FD_SET(inotify_fd, &readfds);
 
                fdcount = select(maxfd+1, &readfds, NULL, NULL, NULL);
                if (fdcount < 0) {
                        if (errno != EINTR)
-                               err("error in select: %s\n", strerror(errno));
+                               err(udev, "error in select: %m\n");
                        continue;
                }
 
                /* get control message */
-               if (FD_ISSET(udevd_sock, &readfds))
-                       get_ctrl_msg();
-
-               /* get netlink message */
-               if (FD_ISSET(uevent_netlink_sock, &readfds)) {
-                       msg = get_netlink_msg();
-                       if (msg)
-                               msg_queue_insert(msg);
+               if (FD_ISSET(udev_ctrl_get_fd(udev_ctrl), &readfds))
+                       handle_ctrl_msg(udev_ctrl);
+
+               /* get kernel uevent */
+               if (FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) {
+                       struct udev_device *dev;
+
+                       dev = udev_monitor_receive_device(kernel_monitor);
+                       if (dev != NULL) {
+                               struct udev_event *event;
+
+                               event = udev_event_new(dev);
+                               if (event != NULL)
+                                       event_queue_insert(event);
+                               else
+                                       udev_device_unref(dev);
+                       }
                }
 
                /* received a signal, clear our notification pipe */
@@ -1254,7 +916,7 @@ int main(int argc, char *argv[])
                                reload_config = 1;
                                buf = malloc(nbytes);
                                if (buf == NULL) {
-                                       err("error getting buffer for inotify, disable watching\n");
+                                       err(udev, "error getting buffer for inotify, disable watching\n");
                                        close(inotify_fd);
                                        inotify_fd = -1;
                                }
@@ -1267,10 +929,9 @@ int main(int argc, char *argv[])
                if (reload_config) {
                        reload_config = 0;
                        udev_rules_cleanup(&rules);
-                       udev_rules_init(&rules, 1);
+                       udev_rules_init(udev, &rules, 1);
                }
 
-               /* forked child has returned */
                if (sigchilds_waiting) {
                        sigchilds_waiting = 0;
                        reap_sigchilds();
@@ -1279,29 +940,26 @@ int main(int argc, char *argv[])
                if (run_exec_q) {
                        run_exec_q = 0;
                        if (!stop_exec_q)
-                               msg_queue_manager();
+                               event_queue_manager(udev);
                }
        }
        rc = 0;
 
 exit:
        udev_rules_cleanup(&rules);
-       sysfs_cleanup();
-       selinux_exit();
 
        if (signal_pipe[READ_END] >= 0)
                close(signal_pipe[READ_END]);
        if (signal_pipe[WRITE_END] >= 0)
                close(signal_pipe[WRITE_END]);
 
-       if (udevd_sock >= 0)
-               close(udevd_sock);
+       udev_ctrl_unref(udev_ctrl);
        if (inotify_fd >= 0)
                close(inotify_fd);
-       if (uevent_netlink_sock >= 0)
-               close(uevent_netlink_sock);
+       udev_monitor_unref(kernel_monitor);
 
+       selinux_exit(udev);
+       udev_unref(udev);
        logging_close();
-
        return rc;
 }