/*
- * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2004-2009 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>
#include <time.h>
#include <getopt.h>
#include <dirent.h>
+#include <sys/prctl.h>
+#include <sys/socket.h>
+#include <sys/signalfd.h>
#include <sys/select.h>
#include <sys/poll.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
-#ifdef HAVE_INOTIFY
#include <sys/inotify.h>
-#endif
#include "udev.h"
#define UDEVD_PRIORITY -4
#define UDEV_PRIORITY -2
-/* maximum limit of forked childs */
-#define UDEVD_MAX_CHILDS 256
-
static int debug;
static void log_fn(struct udev *udev, int priority,
}
}
-static void reap_sigchilds(void);
-
static int debug_trace;
static struct udev_rules *rules;
static struct udev_queue_export *udev_queue_export;
static struct udev_ctrl *udev_ctrl;
-static struct udev_monitor *kernel_monitor;
-static volatile sig_atomic_t sigchilds_waiting;
-static volatile sig_atomic_t udev_exit;
-static volatile sig_atomic_t reload_config;
-static volatile sig_atomic_t signal_received;
-static volatile pid_t settle_pid;
-static int run_exec_q;
-static int stop_exec_q;
+static struct udev_monitor *monitor;
+static int worker_watch[2];
+static pid_t settle_pid;
+static int stop_exec_queue;
+static int reload_config;
static int max_childs;
static int childs;
static struct udev_list_node event_list;
-
-static struct udev_event *node_to_event(struct udev_list_node *node)
+static struct udev_list_node worker_list;
+static int udev_exit;
+static volatile sig_atomic_t worker_exit;
+
+enum poll_fd {
+ FD_CONTROL,
+ FD_NETLINK,
+ FD_INOTIFY,
+ FD_SIGNAL,
+ FD_WORKER,
+};
+
+static struct pollfd pfd[] = {
+ [FD_NETLINK] = { .events = POLLIN },
+ [FD_WORKER] = { .events = POLLIN },
+ [FD_SIGNAL] = { .events = POLLIN },
+ [FD_INOTIFY] = { .events = POLLIN },
+ [FD_CONTROL] = { .events = POLLIN },
+};
+
+enum event_state {
+ EVENT_UNDEF,
+ EVENT_QUEUED,
+ EVENT_RUNNING,
+};
+
+struct event {
+ struct udev_list_node node;
+ struct udev *udev;
+ struct udev_device *dev;
+ enum event_state state;
+ int exitcode;
+ unsigned long long int delaying_seqnum;
+ unsigned long long int seqnum;
+ const char *devpath;
+ size_t devpath_len;
+ const char *devpath_old;
+};
+
+static struct event *node_to_event(struct udev_list_node *node)
{
char *event;
event = (char *)node;
- event -= offsetof(struct udev_event, node);
- return (struct udev_event *)event;
+ event -= offsetof(struct event, node);
+ return (struct event *)event;
+}
+
+enum worker_state {
+ WORKER_UNDEF,
+ WORKER_RUNNING,
+ WORKER_IDLE,
+ WORKER_KILLED,
+};
+
+struct worker {
+ struct udev_list_node node;
+ pid_t pid;
+ struct udev_monitor *monitor;
+ enum worker_state state;
+ struct event *event;
+};
+
+/* passed from worker to main process */
+struct worker_message {
+ pid_t pid;
+ int exitcode;
+};
+
+static struct worker *node_to_worker(struct udev_list_node *node)
+{
+ char *worker;
+
+ worker = (char *)node;
+ worker -= offsetof(struct worker, node);
+ return (struct worker *)worker;
}
-static void event_queue_delete(struct udev_event *event)
+static void event_queue_delete(struct event *event)
{
udev_list_node_remove(&event->node);
/* mark as failed, if "add" event returns non-zero */
- if (event->exitstatus && strcmp(udev_device_get_action(event->dev), "add") == 0)
+ if (event->exitcode && strcmp(udev_device_get_action(event->dev), "add") == 0)
udev_queue_export_device_failed(udev_queue_export, event->dev);
else
udev_queue_export_device_finished(udev_queue_export, event->dev);
udev_device_unref(event->dev);
- udev_event_unref(event);
+ free(event);
}
static void event_sig_handler(int signum)
{
- if (signum == SIGALRM)
+ switch (signum) {
+ case SIGALRM:
_exit(1);
+ break;
+ case SIGTERM:
+ worker_exit = 1;
+ break;
+ }
+}
+
+static void worker_unref(struct worker *worker)
+{
+ udev_monitor_unref(worker->monitor);
+ free(worker);
}
-static void event_fork(struct udev_event *event)
+static void worker_new(struct event *event)
{
+ struct worker *worker;
+ struct udev_monitor *worker_monitor;
pid_t pid;
struct sigaction act;
- int err;
-
-#if 0
- /* single process, no forking, just for testing/profiling */
- err = udev_event_execute_rules(event, rules);
- if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
- udev_event_execute_run(event);
- info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
- event_queue_delete(event);
- return;
-#endif
- if (debug_trace) {
- event->trace = 1;
- fprintf(stderr, "fork %s (%llu)\n",
- udev_device_get_syspath(event->dev),
- udev_device_get_seqnum(event->dev));
- }
+ /* listen for new events */
+ worker_monitor = udev_monitor_new_from_netlink(event->udev, NULL);
+ if (worker_monitor == NULL)
+ return;
+ /* allow the main daemon netlink address to send devices to the worker */
+ udev_monitor_allow_unicast_sender(worker_monitor, monitor);
+ udev_monitor_enable_receiving(worker_monitor);
+
+ worker = calloc(1, sizeof(struct worker));
+ if (worker == NULL)
+ return;
pid = fork();
switch (pid) {
- case 0:
- /* child */
+ case 0: {
+ sigset_t mask;
+ struct udev_device *dev;
+
udev_queue_export_unref(udev_queue_export);
udev_ctrl_unref(udev_ctrl);
+ close(pfd[FD_SIGNAL].fd);
+ close(worker_watch[READ_END]);
logging_close();
- logging_init("udevd-event");
+ logging_init("udevd-work");
setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
/* set signal handlers */
act.sa_handler = event_sig_handler;
sigemptyset (&act.sa_mask);
act.sa_flags = 0;
+ sigaction(SIGTERM, &act, NULL);
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);
+ /* unblock signals */
+ sigfillset(&mask);
+ sigdelset(&mask, SIGTERM);
+ sigdelset(&mask, SIGALRM);
+ sigprocmask(SIG_SETMASK, &mask, NULL);
- /* set timeout to prevent hanging processes */
- alarm(UDEV_EVENT_TIMEOUT);
+ /* request TERM signal if parent exits */
+ prctl(PR_SET_PDEATHSIG, SIGTERM);
- /* apply rules, create node, symlinks */
- err = udev_event_execute_rules(event, rules);
+ /* initial device */
+ dev = event->dev;
- /* rules may change/disable the timeout */
- if (udev_device_get_event_timeout(event->dev) >= 0)
- alarm(udev_device_get_event_timeout(event->dev));
+ while (!worker_exit) {
+ struct udev_event *udev_event;
+ struct worker_message msg;
+ int err;
- /* execute RUN= */
- if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
- udev_event_execute_run(event);
+ udev_event = udev_event_new(dev);
+ if (udev_event == NULL)
+ _exit(3);
- /* apply/restore inotify watch */
- if (err == 0 && event->inotify_watch) {
- udev_watch_begin(event->udev, event->dev);
- udev_device_update_db(event->dev);
- }
+ /* set timeout to prevent hanging processes */
+ alarm(UDEV_EVENT_TIMEOUT);
+
+ /* apply rules, create node, symlinks */
+ err = udev_event_execute_rules(udev_event, rules);
+
+ /* rules may change/disable the timeout */
+ if (udev_device_get_event_timeout(dev) >= 0)
+ alarm(udev_device_get_event_timeout(dev));
+
+ /* execute RUN= */
+ if (err == 0 && !udev_event->ignore_device && udev_get_run(udev_event->udev))
+ udev_event_execute_run(udev_event);
+
+ /* reset alarm */
+ alarm(0);
+
+ /* apply/restore inotify watch */
+ if (err == 0 && udev_event->inotify_watch) {
+ udev_watch_begin(udev_event->udev, dev);
+ udev_device_update_db(dev);
+ }
- /* send processed event back to the kernel netlink socket */
- udev_monitor_send_device(kernel_monitor, event->dev);
+ /* send processed event back to libudev listeners */
+ udev_monitor_send_device(worker_monitor, NULL, dev);
- info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
+ info(event->udev, "seq %llu finished with %i\n", udev_device_get_seqnum(dev), err);
+ udev_device_unref(dev);
+ udev_event_unref(udev_event);
+
+ /* send back the result of the event execution */
+ msg.exitcode = err;
+ msg.pid = getpid();
+ send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
+
+ /* wait for more device messages from udevd */
+ do
+ dev = udev_monitor_receive_device(worker_monitor);
+ while (!worker_exit && dev == NULL);
+ }
+
+ udev_monitor_unref(worker_monitor);
logging_close();
- if (err != 0)
- exit(1);
exit(0);
+ }
case -1:
+ udev_monitor_unref(worker_monitor);
+ event->state = EVENT_QUEUED;
+ free(worker);
err(event->udev, "fork of child failed: %m\n");
- event_queue_delete(event);
break;
default:
- /* get SIGCHLD in main loop */
- 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;
+ /* close monitor, but keep address around */
+ udev_monitor_disconnect(worker_monitor);
+ worker->monitor = worker_monitor;
+ worker->pid = pid;
+ worker->state = WORKER_RUNNING;
+ worker->event = event;
+ event->state = EVENT_RUNNING;
+ udev_list_node_append(&worker->node, &worker_list);
childs++;
+ break;
}
}
-static void event_queue_insert(struct udev_event *event)
+static void event_run(struct event *event)
{
- event->queue_time = time(NULL);
+ struct udev_list_node *loop;
+
+ udev_list_node_foreach(loop, &worker_list) {
+ struct worker *worker = node_to_worker(loop);
+ ssize_t count;
- udev_queue_export_device_queued(udev_queue_export, event->dev);
- 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));
+ if (worker->state != WORKER_IDLE)
+ continue;
+ worker->event = event;
+ worker->state = WORKER_RUNNING;
+ event->state = EVENT_RUNNING;
+ count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
+ if (count < 0) {
+ err(event->udev, "worker [%u] did not accept message, kill it\n", worker->pid);
+ event->state = EVENT_QUEUED;
+ worker->state = WORKER_KILLED;
+ kill(worker->pid, SIGKILL);
+ continue;
+ }
+ return;
+ }
+
+ if (childs >= max_childs) {
+ info(event->udev, "maximum number (%i) of childs reached\n", childs);
+ return;
+ }
+
+ /* start new worker and pass initial device */
+ worker_new(event);
+}
+
+static void event_queue_insert(struct udev_device *dev)
+{
+ struct event *event;
+
+ event = calloc(1, sizeof(struct event));
+ if (event == NULL)
+ return;
+
+ event->udev = udev_device_get_udev(dev);
+ event->dev = dev;
+ event->seqnum = udev_device_get_seqnum(dev);
+ event->devpath = udev_device_get_devpath(dev);
+ event->devpath_len = strlen(event->devpath);
+ event->devpath_old = udev_device_get_devpath_old(dev);
+
+ udev_queue_export_device_queued(udev_queue_export, dev);
+ info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev),
+ udev_device_get_action(dev), udev_device_get_subsystem(dev));
+
+ event->state = EVENT_QUEUED;
udev_list_node_append(&event->node, &event_list);
- run_exec_q = 1;
/* run all events with a timeout set immediately */
- if (udev_device_get_timeout(event->dev) > 0) {
- event_fork(event);
+ if (udev_device_get_timeout(dev) > 0) {
+ worker_new(event);
return;
}
}
+static void worker_kill(int retain)
+{
+ struct udev_list_node *loop;
+ int max;
+
+ if (childs <= retain)
+ return;
+
+ max = childs - retain;
+
+ udev_list_node_foreach(loop, &worker_list) {
+ struct worker *worker = node_to_worker(loop);
+
+ if (max-- <= 0)
+ break;
+
+ if (worker->state == WORKER_KILLED)
+ continue;
+
+ worker->state = WORKER_KILLED;
+ kill(worker->pid, SIGTERM);
+ }
+}
+
static int mem_size_mb(void)
{
FILE *f;
return memsize;
}
-static int compare_devpath(const char *running, const char *waiting)
-{
- int i = 0;
-
- while (running[i] != '\0' && running[i] == waiting[i])
- i++;
-
- /* identical device event found */
- if (running[i] == '\0' && waiting[i] == '\0')
- return 1;
-
- /* parent device event found */
- if (running[i] == '\0' && waiting[i] == '/')
- return 2;
-
- /* child device event found */
- if (running[i] == '/' && waiting[i] == '\0')
- return 3;
-
- /* no matching event */
- return 0;
-}
-
/* lookup event for identical, parent, child device */
-static int devpath_busy(struct udev_event *event)
+static int devpath_busy(struct event *event)
{
struct udev_list_node *loop;
+ size_t common;
/* check if queue contains events we depend on */
udev_list_node_foreach(loop, &event_list) {
- struct udev_event *loop_event = node_to_event(loop);
+ struct event *loop_event = node_to_event(loop);
/* we already found a later event, earlier can not block us, no need to check again */
- if (udev_device_get_seqnum(loop_event->dev) < event->delaying_seqnum)
+ if (loop_event->seqnum < event->delaying_seqnum)
continue;
/* event we checked earlier still exists, no need to check again */
- if (udev_device_get_seqnum(loop_event->dev) == event->delaying_seqnum)
+ if (loop_event->seqnum == event->delaying_seqnum)
return 2;
/* found ourself, no later event can block us */
- if (udev_device_get_seqnum(loop_event->dev) >= udev_device_get_seqnum(event->dev))
+ if (loop_event->seqnum >= event->seqnum)
break;
/* check our old name */
- 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) {
- event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
+ if (event->devpath_old != NULL)
+ if (strcmp(loop_event->devpath, event->devpath_old) == 0) {
+ event->delaying_seqnum = loop_event->seqnum;
return 3;
}
- /* check identical, parent, or child device event */
- 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));
- event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
+ /* compare devpath */
+ common = MIN(loop_event->devpath_len, event->devpath_len);
+
+ /* one devpath is contained in the other? */
+ if (memcmp(loop_event->devpath, event->devpath, common) != 0)
+ continue;
+
+ /* identical device event found */
+ if (loop_event->devpath_len == event->devpath_len) {
+ event->delaying_seqnum = loop_event->seqnum;
return 4;
}
+
+ /* parent device event found */
+ if (event->devpath[common] == '/') {
+ event->delaying_seqnum = loop_event->seqnum;
+ return 5;
+ }
+
+ /* child device event found */
+ if (loop_event->devpath[common] == '/') {
+ event->delaying_seqnum = loop_event->seqnum;
+ return 6;
+ }
+
+ /* no matching device */
+ continue;
}
+
return 0;
}
-/* serializes events for the identical and parent and child devices */
-static void event_queue_manager(struct udev *udev)
+static void events_start(struct udev *udev)
{
struct udev_list_node *loop;
- struct udev_list_node *tmp;
-
-start_over:
- if (udev_list_is_empty(&event_list)) {
- if (childs > 0) {
- err(udev, "event list empty, but childs count is %i", childs);
- childs = 0;
- }
- return;
- }
- udev_list_node_foreach_safe(loop, tmp, &event_list) {
- struct udev_event *loop_event = node_to_event(loop);
-
- if (childs >= max_childs) {
- info(udev, "maximum number (%i) of childs reached\n", childs);
- break;
- }
+ udev_list_node_foreach(loop, &event_list) {
+ struct event *event = node_to_event(loop);
- if (loop_event->pid != 0)
+ if (event->state != EVENT_QUEUED)
continue;
/* do not start event if parent or child event is still running */
- if (devpath_busy(loop_event) != 0) {
- dbg(udev, "delay seq %llu (%s)\n",
- udev_device_get_seqnum(loop_event->dev),
- udev_device_get_devpath(loop_event->dev));
+ if (devpath_busy(event) != 0) {
+ dbg(udev, "delay seq %llu (%s)\n", event->seqnum, event->devpath);
continue;
}
- event_fork(loop_event);
- dbg(udev, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event->dev));
+ event_run(event);
+ }
+}
+
+static void worker_returned(void)
+{
+ while (1) {
+ struct worker_message msg;
+ ssize_t size;
+ struct udev_list_node *loop;
+
+ size = recv(pfd[FD_WORKER].fd, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
+ if (size != sizeof(struct worker_message))
+ break;
+
+ /* lookup worker who sent the signal */
+ udev_list_node_foreach(loop, &worker_list) {
+ struct worker *worker = node_to_worker(loop);
- /* retry if events finished in the meantime */
- if (sigchilds_waiting) {
- sigchilds_waiting = 0;
- reap_sigchilds();
- goto start_over;
+ if (worker->pid != msg.pid)
+ continue;
+
+ /* worker returned */
+ worker->event->exitcode = msg.exitcode;
+ event_queue_delete(worker->event);
+ worker->event = NULL;
+ worker->state = WORKER_IDLE;
+ break;
}
}
}
if (i >= 0) {
info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
udev_set_log_priority(udev, i);
+ worker_kill(0);
}
if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
- stop_exec_q = 1;
+ stop_exec_queue = 1;
}
if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
info(udev, "udevd message (START_EXEC_QUEUE) received\n");
- stop_exec_q = 0;
- event_queue_manager(udev);
+ stop_exec_queue = 0;
}
if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
}
free(key);
}
+ worker_kill(0);
}
i = udev_ctrl_get_set_max_childs(ctrl_msg);
settle_pid = udev_ctrl_get_settle(ctrl_msg);
if (settle_pid > 0) {
info(udev, "udevd message (SETTLE) received\n");
+ kill(settle_pid, SIGUSR1);
+ settle_pid = 0;
}
udev_ctrl_msg_unref(ctrl_msg);
}
/* read inotify messages */
static int handle_inotify(struct udev *udev)
{
- int nbytes, pos;
+ ssize_t nbytes, pos;
char *buf;
struct inotify_event *ev;
- if ((ioctl(inotify_fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
+ if ((ioctl(pfd[FD_INOTIFY].fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
return 0;
buf = malloc(nbytes);
if (buf == NULL) {
err(udev, "error getting buffer for inotify, disable watching\n");
- close(inotify_fd);
- inotify_fd = -1;
- return 0;
+ return -1;
}
- read(inotify_fd, buf, nbytes);
+ nbytes = read(pfd[FD_INOTIFY].fd, buf, nbytes);
for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
struct udev_device *dev;
}
- free (buf);
+ free(buf);
return 0;
}
-static void sig_handler(int signum)
+static void handle_signal(int signo)
{
- switch (signum) {
- case SIGINT:
- case SIGTERM:
- udev_exit = 1;
- break;
- case SIGCHLD:
- /* set flag, then write to pipe if needed */
- sigchilds_waiting = 1;
- break;
- case SIGHUP:
- reload_config = 1;
- break;
- }
+ switch (signo) {
+ case SIGINT:
+ case SIGTERM:
+ udev_exit = 1;
+ break;
+ case SIGCHLD:
+ while (1) {
+ pid_t pid;
+ struct udev_list_node *loop, *tmp;
- signal_received = 1;
-}
+ pid = waitpid(-1, NULL, WNOHANG);
+ if (pid <= 0)
+ break;
-static void udev_done(int pid, int exitstatus)
-{
- struct udev_list_node *loop;
+ udev_list_node_foreach_safe(loop, tmp, &worker_list) {
+ struct worker *worker = node_to_worker(loop);
- /* find event associated with pid and delete it */
- udev_list_node_foreach(loop, &event_list) {
- struct udev_event *loop_event = node_to_event(loop);
-
- if (loop_event->pid == pid) {
- info(loop_event->udev, "seq %llu cleanup, pid [%d], status %i, %ld seconds old\n",
- udev_device_get_seqnum(loop_event->dev), loop_event->pid,
- exitstatus, time(NULL) - loop_event->queue_time);
- loop_event->exitstatus = exitstatus;
- if (debug_trace)
- fprintf(stderr, "exit %s (%llu)\n",
- udev_device_get_syspath(loop_event->dev),
- udev_device_get_seqnum(loop_event->dev));
- event_queue_delete(loop_event);
- childs--;
-
- /* there may be dependent events waiting */
- run_exec_q = 1;
- return;
- }
- }
-}
+ if (worker->pid != pid)
+ continue;
-static void reap_sigchilds(void)
-{
- pid_t pid;
- int status;
+ /* fail event, if worker died unexpectedly */
+ if (worker->event != NULL) {
+ worker->event->exitcode = 127;
+ event_queue_delete(worker->event);
+ }
- while (1) {
- pid = waitpid(-1, &status, WNOHANG);
- if (pid <= 0)
- break;
- if (WIFEXITED(status))
- status = WEXITSTATUS(status);
- else if (WIFSIGNALED(status))
- status = WTERMSIG(status) + 128;
- else
- status = 0;
- udev_done(pid, status);
+ udev_list_node_remove(&worker->node);
+ worker_unref(worker);
+ childs--;
+ break;
+ }
+ }
+ break;
+ case SIGHUP:
+ reload_config = 1;
+ break;
}
}
{
struct udev *udev;
int fd;
- struct sigaction act;
+ sigset_t mask;
const char *value;
int daemonize = 0;
int resolve_names = 1;
rc = 1;
goto exit;
}
-
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;
}
+ pfd[FD_CONTROL].fd = udev_ctrl_get_fd(udev_ctrl);
- kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
- if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
+ monitor = udev_monitor_new_from_netlink(udev, "kernel");
+ if (monitor == NULL || udev_monitor_enable_receiving(monitor) < 0) {
fprintf(stderr, "error initializing netlink socket\n");
err(udev, "error initializing netlink socket\n");
rc = 3;
goto exit;
}
- udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
+ udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
+ pfd[FD_NETLINK].fd = udev_monitor_get_fd(monitor);
+
+ pfd[FD_INOTIFY].fd = udev_watch_init(udev);
+ if (pfd[FD_INOTIFY].fd < 0) {
+ fprintf(stderr, "error initializing inotify\n");
+ err(udev, "error initializing inotify\n");
+ rc = 4;
+ goto exit;
+ }
+
+ if (udev_get_rules_path(udev) != NULL) {
+ inotify_add_watch(pfd[FD_INOTIFY].fd, udev_get_rules_path(udev),
+ IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
+ } else {
+ char filename[UTIL_PATH_SIZE];
+
+ inotify_add_watch(pfd[FD_INOTIFY].fd, UDEV_PREFIX "/lib/udev/rules.d",
+ IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
+ inotify_add_watch(pfd[FD_INOTIFY].fd, SYSCONFDIR "/udev/rules.d",
+ IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
+
+ /* watch dynamic rules directory */
+ util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
+ inotify_add_watch(pfd[FD_INOTIFY].fd, filename,
+ IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
+ }
+ udev_watch_restore(udev);
+
+ /* block and listen to all signals on signalfd */
+ sigfillset(&mask);
+ sigprocmask(SIG_SETMASK, &mask, NULL);
+ pfd[FD_SIGNAL].fd = signalfd(-1, &mask, 0);
+ if (pfd[FD_SIGNAL].fd < 0) {
+ fprintf(stderr, "error getting signalfd\n");
+ err(udev, "error getting signalfd\n");
+ rc = 5;
+ goto exit;
+ }
+
+ /* unnamed socket from workers to the main daemon */
+ if (socketpair(AF_LOCAL, SOCK_DGRAM, 0, worker_watch) < 0) {
+ fprintf(stderr, "error getting socketpair\n");
+ err(udev, "error getting socketpair\n");
+ rc = 6;
+ goto exit;
+ }
+ pfd[FD_WORKER].fd = worker_watch[READ_END];
rules = udev_rules_new(udev, resolve_names);
if (rules == NULL) {
err(udev, "error reading rules\n");
goto exit;
}
- udev_list_init(&event_list);
+
udev_queue_export = udev_queue_export_new(udev);
if (udev_queue_export == NULL) {
err(udev, "error creating queue file\n");
pid = fork();
switch (pid) {
case 0:
- dbg(udev, "daemonized fork running\n");
break;
case -1:
err(udev, "fork of daemon failed: %m\n");
rc = 4;
goto exit;
default:
- dbg(udev, "child [%u] running, parent exits\n", pid);
rc = 0;
goto exit;
}
}
+ startup_log(udev);
+
/* redirect std{out,err} */
if (!debug && !debug_trace) {
dup2(fd, STDIN_FILENO);
close(fd);
}
- startup_log(udev);
-
- /* set signal handlers */
- memset(&act, 0x00, sizeof(struct sigaction));
- act.sa_handler = sig_handler;
- sigemptyset(&act.sa_mask);
- act.sa_flags = SA_RESTART;
- sigaction(SIGINT, &act, NULL);
- sigaction(SIGTERM, &act, NULL);
- sigaction(SIGCHLD, &act, NULL);
- sigaction(SIGHUP, &act, NULL);
-
- /* watch rules directory */
- udev_watch_init(udev);
- if (inotify_fd >= 0) {
- 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[UTIL_PATH_SIZE];
-
- inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
- IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
- inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
- IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
-
- /* watch dynamic rules directory */
- util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
- inotify_add_watch(inotify_fd, filename,
- IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
- }
-
- udev_watch_restore(udev);
- }
-
/* in trace mode run one event after the other */
if (debug_trace) {
max_childs = 1;
} else {
int memsize = mem_size_mb();
+
if (memsize > 0)
- max_childs = 128 + (memsize / 4);
+ max_childs = 128 + (memsize / 8);
else
- max_childs = UDEVD_MAX_CHILDS;
+ max_childs = 128;
}
+
/* possibly overwrite maximum limit of executed events */
value = getenv("UDEVD_MAX_CHILDS");
if (value)
max_childs = strtoul(value, NULL, 10);
info(udev, "initialize max_childs to %u\n", max_childs);
+ udev_list_init(&event_list);
+ udev_list_init(&worker_list);
+
while (!udev_exit) {
- sigset_t blocked_mask, orig_mask;
- struct pollfd pfd[4];
- struct pollfd *ctrl_poll, *monitor_poll, *inotify_poll = NULL;
- int nfds = 0;
int fdcount;
+ int timeout;
- sigfillset(&blocked_mask);
- sigprocmask(SIG_SETMASK, &blocked_mask, &orig_mask);
- if (signal_received) {
- sigprocmask(SIG_SETMASK, &orig_mask, NULL);
- goto handle_signals;
- }
+ /* set timeout to kill idle workers */
+ if (udev_list_is_empty(&event_list) && childs > 2)
+ timeout = 3 * 1000;
+ else
+ timeout = -1;
+ /* wait for events */
+ fdcount = poll(pfd, ARRAY_SIZE(pfd), timeout);
+ if (fdcount < 0)
+ continue;
- ctrl_poll = &pfd[nfds++];
- ctrl_poll->fd = udev_ctrl_get_fd(udev_ctrl);
- ctrl_poll->events = POLLIN;
+ /* timeout - kill idle workers */
+ if (fdcount == 0)
+ worker_kill(2);
- monitor_poll = &pfd[nfds++];
- monitor_poll->fd = udev_monitor_get_fd(kernel_monitor);
- monitor_poll->events = POLLIN;
+ /* event has finished */
+ if (pfd[FD_WORKER].revents & POLLIN)
+ worker_returned();
- if (inotify_fd >= 0) {
- inotify_poll = &pfd[nfds++];
- inotify_poll->fd = inotify_fd;
- inotify_poll->events = POLLIN;
- }
+ /* get kernel uevent */
+ if (pfd[FD_NETLINK].revents & POLLIN) {
+ struct udev_device *dev;
- fdcount = ppoll(pfd, nfds, NULL, &orig_mask);
- sigprocmask(SIG_SETMASK, &orig_mask, NULL);
- if (fdcount < 0) {
- if (errno == EINTR)
- goto handle_signals;
- err(udev, "error in select: %m\n");
- continue;
+ dev = udev_monitor_receive_device(monitor);
+ if (dev != NULL)
+ event_queue_insert(dev);
+ else
+ udev_device_unref(dev);
}
- /* get control message */
- if (ctrl_poll->revents & POLLIN)
- handle_ctrl_msg(udev_ctrl);
-
- /* get kernel uevent */
- if (monitor_poll->revents & POLLIN) {
- struct udev_device *dev;
+ /* start new events */
+ if (!udev_list_is_empty(&event_list) && !stop_exec_queue)
+ events_start(udev);
- dev = udev_monitor_receive_device(kernel_monitor);
- if (dev != NULL) {
- struct udev_event *event;
+ /* get signal */
+ if (pfd[FD_SIGNAL].revents & POLLIN) {
+ struct signalfd_siginfo fdsi;
+ ssize_t size;
- event = udev_event_new(dev);
- if (event != NULL)
- event_queue_insert(event);
- else
- udev_device_unref(dev);
- }
+ size = read(pfd[FD_SIGNAL].fd, &fdsi, sizeof(struct signalfd_siginfo));
+ if (size == sizeof(struct signalfd_siginfo))
+ handle_signal(fdsi.ssi_signo);
}
- /* rules directory inotify watch */
- if (inotify_poll && (inotify_poll->revents & POLLIN))
+ /* device node and rules directory inotify watch */
+ if (pfd[FD_INOTIFY].revents & POLLIN)
handle_inotify(udev);
-handle_signals:
- signal_received = 0;
+ /*
+ * get control message
+ *
+ * This needs to be after the inotify handling, to make sure,
+ * that the settle signal is send back after the possibly generated
+ * "change" events by the inotify device node watch.
+ */
+ if (pfd[FD_CONTROL].revents & POLLIN)
+ handle_ctrl_msg(udev_ctrl);
/* rules changed, set by inotify or a HUP signal */
if (reload_config) {
struct udev_rules *rules_new;
- reload_config = 0;
+ worker_kill(0);
rules_new = udev_rules_new(udev, resolve_names);
if (rules_new != NULL) {
udev_rules_unref(rules);
rules = rules_new;
}
- }
-
- if (sigchilds_waiting) {
- sigchilds_waiting = 0;
- reap_sigchilds();
- }
-
- if (run_exec_q) {
- run_exec_q = 0;
- if (!stop_exec_q)
- event_queue_manager(udev);
- }
-
- if (settle_pid > 0) {
- kill(settle_pid, SIGUSR1);
- settle_pid = 0;
+ reload_config = 0;
}
}
+
udev_queue_export_cleanup(udev_queue_export);
rc = 0;
exit:
-
udev_queue_export_unref(udev_queue_export);
udev_rules_unref(rules);
udev_ctrl_unref(udev_ctrl);
- if (inotify_fd >= 0)
- close(inotify_fd);
- udev_monitor_unref(kernel_monitor);
+ if (pfd[FD_SIGNAL].fd >= 0)
+ close(pfd[FD_SIGNAL].fd);
+ if (worker_watch[READ_END] >= 0)
+ close(worker_watch[READ_END]);
+ if (worker_watch[WRITE_END] >= 0)
+ close(worker_watch[WRITE_END]);
+ udev_monitor_unref(monitor);
udev_selinux_exit(udev);
udev_unref(udev);
logging_close();
projects / systemd / commitdiff