/*
- * Copyright (C) 2004-2009 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2004-2011 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
+#include <stdbool.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <time.h>
#include <getopt.h>
#include <dirent.h>
+#include <sys/time.h>
#include <sys/prctl.h>
#include <sys/socket.h>
+#include <sys/un.h>
#include <sys/signalfd.h>
-#include <sys/select.h>
+#include <sys/epoll.h>
#include <sys/poll.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/inotify.h>
+#include <sys/utsname.h>
#include "udev.h"
+#include "sd-daemon.h"
-#define UDEVD_PRIORITY -4
-#define UDEV_PRIORITY -2
-
-static int debug;
+static bool 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);
+ char buf[1024];
+ struct timespec ts;
+
+ vsnprintf(buf, sizeof(buf), format, args);
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+ fprintf(stderr, "[%llu.%06u] [%u] %s: %s",
+ (unsigned long long) ts.tv_sec, (unsigned int) ts.tv_nsec/1000,
+ (int) getpid(), fn, buf);
} else {
vsyslog(priority, format, args);
}
}
-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 *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_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 },
-};
+static int worker_watch[2] = { -1, -1 };
+static int fd_signal = -1;
+static int fd_ep = -1;
+static int fd_inotify = -1;
+static bool stop_exec_queue;
+static bool reload_config;
+static int children;
+static int children_max;
+static int exec_delay;
+static sigset_t sigmask_orig;
+static UDEV_LIST(event_list);
+static UDEV_LIST(worker_list);
+static bool udev_exit;
enum event_state {
EVENT_UNDEF,
const char *devpath;
size_t devpath_len;
const char *devpath_old;
+ dev_t devnum;
+ bool is_block;
+ int ifindex;
};
static struct event *node_to_event(struct udev_list_node *node)
return (struct event *)event;
}
+static void event_queue_cleanup(struct udev *udev, enum event_state type);
+
enum worker_state {
WORKER_UNDEF,
WORKER_RUNNING,
struct worker {
struct udev_list_node node;
+ struct udev *udev;
+ int refcount;
pid_t pid;
struct udev_monitor *monitor;
enum worker_state state;
return (struct worker *)worker;
}
-static void event_queue_delete(struct event *event)
+static void event_queue_delete(struct event *event, bool export)
{
udev_list_node_remove(&event->node);
- /* mark as failed, if "add" event returns non-zero */
- if (event->exitcode && strcmp(udev_device_get_action(event->dev), "add") == 0)
- udev_queue_export_device_failed(udev_queue_export, event->dev);
- else
+ if (export) {
udev_queue_export_device_finished(udev_queue_export, event->dev);
-
- info(event->udev, "seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode);
+ info(event->udev, "seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode);
+ }
udev_device_unref(event->dev);
free(event);
}
-static void event_sig_handler(int signum)
+static struct worker *worker_ref(struct worker *worker)
{
- switch (signum) {
- case SIGALRM:
- _exit(1);
- break;
- case SIGTERM:
- worker_exit = 1;
- break;
- }
+ worker->refcount++;
+ return worker;
}
-static void worker_unref(struct worker *worker)
+static void worker_cleanup(struct worker *worker)
{
+ udev_list_node_remove(&worker->node);
udev_monitor_unref(worker->monitor);
+ children--;
free(worker);
}
+static void worker_unref(struct worker *worker)
+{
+ worker->refcount--;
+ if (worker->refcount > 0)
+ return;
+ info(worker->udev, "worker [%u] cleaned up\n", worker->pid);
+ worker_cleanup(worker);
+}
+
+static void worker_list_cleanup(struct udev *udev)
+{
+ struct udev_list_node *loop, *tmp;
+
+ udev_list_node_foreach_safe(loop, tmp, &worker_list) {
+ struct worker *worker = node_to_worker(loop);
+
+ worker_cleanup(worker);
+ }
+}
+
static void worker_new(struct event *event)
{
+ struct udev *udev = event->udev;
struct worker *worker;
struct udev_monitor *worker_monitor;
pid_t pid;
- struct sigaction act;
/* listen for new events */
- worker_monitor = udev_monitor_new_from_netlink(event->udev, NULL);
+ worker_monitor = udev_monitor_new_from_netlink(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);
- util_set_fd_cloexec(udev_monitor_get_fd(worker_monitor));
worker = calloc(1, sizeof(struct worker));
- if (worker == NULL)
+ if (worker == NULL) {
+ udev_monitor_unref(worker_monitor);
return;
+ }
+ /* worker + event reference */
+ worker->refcount = 2;
+ worker->udev = udev;
pid = fork();
switch (pid) {
case 0: {
+ struct udev_device *dev = NULL;
+ int fd_monitor;
+ struct epoll_event ep_signal, ep_monitor;
sigset_t mask;
- struct udev_device *dev;
+ int rc = EXIT_SUCCESS;
+ /* move initial device from queue */
+ dev = event->dev;
+ event->dev = NULL;
+
+ free(worker);
+ worker_list_cleanup(udev);
+ event_queue_cleanup(udev, EVENT_UNDEF);
udev_queue_export_unref(udev_queue_export);
udev_monitor_unref(monitor);
udev_ctrl_unref(udev_ctrl);
- close(pfd[FD_SIGNAL].fd);
+ close(fd_signal);
+ close(fd_ep);
close(worker_watch[READ_END]);
- udev_log_close();
- udev_log_init("udevd-work");
- setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
-
- /* set signal handlers */
- memset(&act, 0x00, sizeof(act));
- act.sa_handler = event_sig_handler;
- sigemptyset (&act.sa_mask);
- act.sa_flags = 0;
- sigaction(SIGTERM, &act, NULL);
- sigaction(SIGALRM, &act, NULL);
-
- /* unblock signals */
+
sigfillset(&mask);
- sigdelset(&mask, SIGTERM);
- sigdelset(&mask, SIGALRM);
- sigprocmask(SIG_SETMASK, &mask, NULL);
+ fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
+ if (fd_signal < 0) {
+ err(udev, "error creating signalfd %m\n");
+ rc = 2;
+ goto out;
+ }
+
+ fd_ep = epoll_create1(EPOLL_CLOEXEC);
+ if (fd_ep < 0) {
+ err(udev, "error creating epoll fd: %m\n");
+ rc = 3;
+ goto out;
+ }
+
+ memset(&ep_signal, 0, sizeof(struct epoll_event));
+ ep_signal.events = EPOLLIN;
+ ep_signal.data.fd = fd_signal;
+
+ fd_monitor = udev_monitor_get_fd(worker_monitor);
+ memset(&ep_monitor, 0, sizeof(struct epoll_event));
+ ep_monitor.events = EPOLLIN;
+ ep_monitor.data.fd = fd_monitor;
+
+ if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
+ epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) {
+ err(udev, "fail to add fds to epoll: %m\n");
+ rc = 4;
+ goto out;
+ }
/* request TERM signal if parent exits */
prctl(PR_SET_PDEATHSIG, SIGTERM);
- /* initial device */
- dev = event->dev;
-
- while (!worker_exit) {
+ for (;;) {
struct udev_event *udev_event;
struct worker_message msg;
int err;
+ info(udev, "seq %llu running\n", udev_device_get_seqnum(dev));
udev_event = udev_event_new(dev);
- if (udev_event == NULL)
- _exit(3);
-
- /* set timeout to prevent hanging processes */
- alarm(UDEV_EVENT_TIMEOUT);
+ if (udev_event == NULL) {
+ rc = 5;
+ goto out;
+ }
- /* apply rules, create node, symlinks */
- err = udev_event_execute_rules(udev_event, rules);
+ /* needed for SIGCHLD/SIGTERM in spawn() */
+ udev_event->fd_signal = fd_signal;
- /* rules may change/disable the timeout */
- if (udev_device_get_event_timeout(dev) >= 0)
- alarm(udev_device_get_event_timeout(dev));
+ if (exec_delay > 0)
+ udev_event->exec_delay = exec_delay;
- /* execute RUN= */
- if (err == 0 && !udev_event->ignore_device && udev_get_run(udev_event->udev))
- udev_event_execute_run(udev_event);
+ /* apply rules, create node, symlinks */
+ err = udev_event_execute_rules(udev_event, rules, &sigmask_orig);
- /* reset alarm */
- alarm(0);
+ if (err == 0)
+ udev_event_execute_run(udev_event, &sigmask_orig);
/* apply/restore inotify watch */
if (err == 0 && udev_event->inotify_watch) {
- udev_watch_begin(udev_event->udev, dev);
+ udev_watch_begin(udev, dev);
udev_device_update_db(dev);
}
/* send processed event back to libudev listeners */
udev_monitor_send_device(worker_monitor, NULL, dev);
- info(event->udev, "seq %llu processed with %i\n", udev_device_get_seqnum(dev), err);
+ /* send udevd the result of the event execution */
+ memset(&msg, 0, sizeof(struct worker_message));
+ if (err != 0)
+ msg.exitcode = err;
+ msg.pid = getpid();
+ send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
+
+ info(udev, "seq %llu processed with %i\n", udev_device_get_seqnum(dev), err);
+
udev_device_unref(dev);
+ dev = NULL;
+
+ if (udev_event->sigterm) {
+ udev_event_unref(udev_event);
+ goto out;
+ }
+
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 main udevd, or term signal */
+ while (dev == NULL) {
+ struct epoll_event ev[4];
+ int fdcount;
+ int i;
+
+ fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), -1);
+ if (fdcount < 0) {
+ if (errno == EINTR)
+ continue;
+ err = -errno;
+ err(udev, "failed to poll: %m\n");
+ goto out;
+ }
- /* wait for more device messages from udevd */
- do
- dev = udev_monitor_receive_device(worker_monitor);
- while (!worker_exit && dev == NULL);
+ for (i = 0; i < fdcount; i++) {
+ if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
+ dev = udev_monitor_receive_device(worker_monitor);
+ break;
+ } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
+ struct signalfd_siginfo fdsi;
+ ssize_t size;
+
+ size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
+ if (size != sizeof(struct signalfd_siginfo))
+ continue;
+ switch (fdsi.ssi_signo) {
+ case SIGTERM:
+ goto out;
+ }
+ }
+ }
+ }
}
-
+out:
+ udev_device_unref(dev);
+ if (fd_signal >= 0)
+ close(fd_signal);
+ if (fd_ep >= 0)
+ close(fd_ep);
+ close(fd_inotify);
+ close(worker_watch[WRITE_END]);
+ udev_rules_unref(rules);
udev_monitor_unref(worker_monitor);
+ udev_unref(udev);
udev_log_close();
- exit(0);
+ exit(rc);
}
case -1:
udev_monitor_unref(worker_monitor);
event->state = EVENT_QUEUED;
free(worker);
- err(event->udev, "fork of child failed: %m\n");
+ err(udev, "fork of child failed: %m\n");
break;
default:
/* close monitor, but keep address around */
worker->event = event;
event->state = EVENT_RUNNING;
udev_list_node_append(&worker->node, &worker_list);
- childs++;
- info(event->udev, "seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid);
+ children++;
+ info(udev, "seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid);
break;
}
}
-static void event_run(struct event *event)
+static void event_run(struct event *event, bool force)
{
struct udev_list_node *loop;
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;
+ err(event->udev, "worker [%u] did not accept message %zi (%m), kill it\n", worker->pid, count);
kill(worker->pid, SIGKILL);
+ worker->state = WORKER_KILLED;
continue;
}
+ worker_ref(worker);
+ worker->event = event;
+ worker->state = WORKER_RUNNING;
+ event->state = EVENT_RUNNING;
return;
}
- if (childs >= max_childs) {
- info(event->udev, "maximum number (%i) of childs reached\n", childs);
+ if (!force && children >= children_max) {
+ if (children_max > 1)
+ info(event->udev, "maximum number (%i) of children reached\n", children);
return;
}
worker_new(event);
}
-static void event_queue_insert(struct udev_device *dev)
+static int event_queue_insert(struct udev_device *dev)
{
struct event *event;
event = calloc(1, sizeof(struct event));
if (event == NULL)
- return;
+ return -1;
event->udev = udev_device_get_udev(dev);
event->dev = dev;
event->devpath = udev_device_get_devpath(dev);
event->devpath_len = strlen(event->devpath);
event->devpath_old = udev_device_get_devpath_old(dev);
+ event->devnum = udev_device_get_devnum(dev);
+ event->is_block = (strcmp("block", udev_device_get_subsystem(dev)) == 0);
+ event->ifindex = udev_device_get_ifindex(dev);
udev_queue_export_device_queued(udev_queue_export, dev);
info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev),
/* run all events with a timeout set immediately */
if (udev_device_get_timeout(dev) > 0) {
- worker_new(event);
- return;
+ event_run(event, true);
+ return 0;
}
+
+ return 0;
}
-static void worker_kill(int retain)
+static void worker_kill(struct udev *udev, int retain)
{
struct udev_list_node *loop;
int max;
- if (childs <= retain)
+ if (children <= retain)
return;
- max = childs - retain;
+ max = children - retain;
udev_list_node_foreach(loop, &worker_list) {
struct worker *worker = node_to_worker(loop);
}
}
-static int mem_size_mb(void)
-{
- FILE *f;
- char buf[4096];
- long int memsize = -1;
-
- f = fopen("/proc/meminfo", "r");
- if (f == NULL)
- return -1;
-
- while (fgets(buf, sizeof(buf), f) != NULL) {
- long int value;
-
- if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
- memsize = value / 1024;
- break;
- }
- }
-
- fclose(f);
- return memsize;
-}
-
/* lookup event for identical, parent, child device */
-static int devpath_busy(struct event *event)
+static bool is_devpath_busy(struct event *event)
{
struct udev_list_node *loop;
size_t common;
/* event we checked earlier still exists, no need to check again */
if (loop_event->seqnum == event->delaying_seqnum)
- return 2;
+ return true;
/* found ourself, no later event can block us */
if (loop_event->seqnum >= event->seqnum)
break;
+ /* check major/minor */
+ if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
+ return true;
+
+ /* check network device ifindex */
+ if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
+ return true;
+
/* check our old name */
- if (event->devpath_old != NULL)
- if (strcmp(loop_event->devpath, event->devpath_old) == 0) {
- event->delaying_seqnum = loop_event->seqnum;
- return 3;
- }
+ if (event->devpath_old != NULL && strcmp(loop_event->devpath, event->devpath_old) == 0) {
+ event->delaying_seqnum = loop_event->seqnum;
+ return true;
+ }
/* compare devpath */
common = MIN(loop_event->devpath_len, event->devpath_len);
/* identical device event found */
if (loop_event->devpath_len == event->devpath_len) {
+ /* devices names might have changed/swapped in the meantime */
+ if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
+ continue;
+ if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
+ continue;
event->delaying_seqnum = loop_event->seqnum;
- return 4;
+ return true;
}
/* parent device event found */
if (event->devpath[common] == '/') {
event->delaying_seqnum = loop_event->seqnum;
- return 5;
+ return true;
}
/* child device event found */
if (loop_event->devpath[common] == '/') {
event->delaying_seqnum = loop_event->seqnum;
- return 6;
+ return true;
}
/* no matching device */
continue;
}
- return 0;
+ return false;
}
-static void events_start(struct udev *udev)
+static void event_queue_start(struct udev *udev)
{
struct udev_list_node *loop;
continue;
/* do not start event if parent or child event is still running */
- if (devpath_busy(event) != 0) {
+ if (is_devpath_busy(event)) {
dbg(udev, "delay seq %llu (%s)\n", event->seqnum, event->devpath);
continue;
}
- event_run(event);
+ event_run(event, false);
}
}
-static void worker_returned(void)
+static void event_queue_cleanup(struct udev *udev, enum event_state match_type)
{
- while (1) {
+ struct udev_list_node *loop, *tmp;
+
+ udev_list_node_foreach_safe(loop, tmp, &event_list) {
+ struct event *event = node_to_event(loop);
+
+ if (match_type != EVENT_UNDEF && match_type != event->state)
+ continue;
+
+ event_queue_delete(event, false);
+ }
+}
+
+static void worker_returned(int fd_worker)
+{
+ for (;;) {
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);
+ size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
if (size != sizeof(struct worker_message))
break;
/* worker returned */
worker->event->exitcode = msg.exitcode;
- event_queue_delete(worker->event);
+ event_queue_delete(worker->event, true);
worker->event = NULL;
- worker->state = WORKER_IDLE;
+ if (worker->state != WORKER_KILLED)
+ worker->state = WORKER_IDLE;
+ worker_unref(worker);
break;
}
}
}
/* receive the udevd message from userspace */
-static void handle_ctrl_msg(struct udev_ctrl *uctrl)
+static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl)
{
struct udev *udev = udev_ctrl_get_udev(uctrl);
- struct udev_ctrl_msg *ctrl_msg;
+ struct udev_ctrl_connection *ctrl_conn;
+ struct udev_ctrl_msg *ctrl_msg = NULL;
const char *str;
int i;
- ctrl_msg = udev_ctrl_receive_msg(uctrl);
+ ctrl_conn = udev_ctrl_get_connection(uctrl);
+ if (ctrl_conn == NULL)
+ goto out;
+
+ ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
if (ctrl_msg == NULL)
- return;
+ goto out;
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);
- worker_kill(0);
+ worker_kill(udev, 0);
}
if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
- stop_exec_queue = 1;
+ stop_exec_queue = true;
}
if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
info(udev, "udevd message (START_EXEC_QUEUE) received\n");
- stop_exec_queue = 0;
+ stop_exec_queue = false;
}
if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
info(udev, "udevd message (RELOAD_RULES) received\n");
- reload_config = 1;
+ reload_config = true;
}
str = udev_ctrl_get_set_env(ctrl_msg);
}
free(key);
}
- worker_kill(0);
+ worker_kill(udev, 0);
}
- i = udev_ctrl_get_set_max_childs(ctrl_msg);
+ i = udev_ctrl_get_set_children_max(ctrl_msg);
if (i >= 0) {
- info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
- max_childs = i;
+ info(udev, "udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i);
+ children_max = i;
}
- 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;
+ if (udev_ctrl_get_ping(ctrl_msg) > 0)
+ info(udev, "udevd message (SYNC) received\n");
+
+ if (udev_ctrl_get_exit(ctrl_msg) > 0) {
+ info(udev, "udevd message (EXIT) received\n");
+ udev_exit = true;
+ /* keep reference to block the client until we exit */
+ udev_ctrl_connection_ref(ctrl_conn);
}
+out:
udev_ctrl_msg_unref(ctrl_msg);
+ return udev_ctrl_connection_unref(ctrl_conn);
}
/* read inotify messages */
static int handle_inotify(struct udev *udev)
{
- ssize_t nbytes, pos;
+ int nbytes, pos;
char *buf;
struct inotify_event *ev;
- if ((ioctl(pfd[FD_INOTIFY].fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
+ if ((ioctl(fd_inotify, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
return 0;
buf = malloc(nbytes);
return -1;
}
- nbytes = read(pfd[FD_INOTIFY].fd, buf, nbytes);
+ nbytes = read(fd_inotify, buf, nbytes);
for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
struct udev_device *dev;
ev = (struct inotify_event *)(buf + pos);
if (ev->len) {
- dbg(udev, "inotify event: %x for %s\n", ev->mask, ev->name);
- reload_config = 1;
+ const char *s;
+
+ info(udev, "inotify event: %x for %s\n", ev->mask, ev->name);
+ s = strstr(ev->name, ".rules");
+ if (s == NULL)
+ continue;
+ if (strlen(s) != strlen(".rules"))
+ continue;
+ reload_config = true;
continue;
}
dev = udev_watch_lookup(udev, ev->wd);
if (dev != NULL) {
- dbg(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
+ info(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
if (ev->mask & IN_CLOSE_WRITE) {
char filename[UTIL_PATH_SIZE];
int fd;
info(udev, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
util_strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
fd = open(filename, O_WRONLY);
- if (fd < 0 || write(fd, "change", 6) < 0)
- info(udev, "error writing uevent: %m\n");
- close(fd);
+ if (fd >= 0) {
+ if (write(fd, "change", 6) < 0)
+ info(udev, "error writing uevent: %m\n");
+ close(fd);
+ }
}
if (ev->mask & IN_IGNORED)
udev_watch_end(udev, dev);
switch (signo) {
case SIGINT:
case SIGTERM:
- udev_exit = 1;
+ udev_exit = true;
break;
case SIGCHLD:
- while (1) {
+ for (;;) {
pid_t pid;
int status;
struct udev_list_node *loop, *tmp;
if (worker->pid != pid)
continue;
+ info(udev, "worker [%u] exit\n", pid);
- /* fail event, if worker died unexpectedly */
- if (worker->event != NULL) {
- int exitcode;
-
- if (WIFEXITED(status))
- exitcode = WEXITSTATUS(status);
- else if (WIFSIGNALED(status))
- exitcode = WTERMSIG(status) + 128;
- else
- exitcode = 0;
- worker->event->exitcode = exitcode;
- err(udev, "worker [%u] unexpectedly returned with %i\n", pid, exitcode);
- event_queue_delete(worker->event);
+ if (WIFEXITED(status)) {
+ if (WEXITSTATUS(status) != 0)
+ err(udev, "worker [%u] exit with return code %i\n", pid, WEXITSTATUS(status));
+ } else if (WIFSIGNALED(status)) {
+ err(udev, "worker [%u] terminated by signal %i (%s)\n",
+ pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
+ } else if (WIFSTOPPED(status)) {
+ err(udev, "worker [%u] stopped\n", pid);
+ } else if (WIFCONTINUED(status)) {
+ err(udev, "worker [%u] continued\n", pid);
+ } else {
+ err(udev, "worker [%u] exit with status 0x%04x\n", pid, status);
}
- udev_list_node_remove(&worker->node);
+ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+ if (worker->event != NULL) {
+ err(udev, "worker [%u] failed while handling '%s'\n",
+ pid, worker->event->devpath);
+ worker->event->exitcode = -32;
+ event_queue_delete(worker->event, true);
+ /* drop reference taken for state 'running' */
+ worker_unref(worker);
+ }
+ }
worker_unref(worker);
- childs--;
- info(udev, "worker [%u] exit\n", pid);
break;
}
}
break;
case SIGHUP:
- reload_config = 1;
+ reload_config = true;
break;
}
}
-static void startup_log(struct udev *udev)
+static void static_dev_create_from_modules(struct udev *udev)
{
+ struct utsname kernel;
+ char modules[UTIL_PATH_SIZE];
+ char buf[4096];
FILE *f;
- char path[UTIL_PATH_SIZE];
- struct stat statbuf;
- f = fopen("/dev/kmsg", "w");
- if (f != NULL)
- fprintf(f, "<6>udev: starting version " VERSION "\n");
-
- util_strscpyl(path, sizeof(path), udev_get_sys_path(udev), "/class/mem/null", NULL);
- if (lstat(path, &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) {
- const char *depr_str =
- "udev: missing sysfs features; please update the kernel "
- "or disable the kernel's CONFIG_SYSFS_DEPRECATED option; "
- "udev may fail to work correctly";
-
- if (f != NULL)
- fprintf(f, "<3>%s\n", depr_str);
- err(udev, "%s\n", depr_str);
- sleep(3);
+ uname(&kernel);
+ util_strscpyl(modules, sizeof(modules), "/lib/modules/", kernel.release, "/modules.devname", NULL);
+ f = fopen(modules, "r");
+ if (f == NULL)
+ return;
+
+ while (fgets(buf, sizeof(buf), f) != NULL) {
+ char *s;
+ const char *modname;
+ const char *devname;
+ const char *devno;
+ int maj, min;
+ char type;
+ mode_t mode;
+ char filename[UTIL_PATH_SIZE];
+
+ if (buf[0] == '#')
+ continue;
+
+ modname = buf;
+ s = strchr(modname, ' ');
+ if (s == NULL)
+ continue;
+ s[0] = '\0';
+
+ devname = &s[1];
+ s = strchr(devname, ' ');
+ if (s == NULL)
+ continue;
+ s[0] = '\0';
+
+ devno = &s[1];
+ s = strchr(devno, ' ');
+ if (s == NULL)
+ s = strchr(devno, '\n');
+ if (s != NULL)
+ s[0] = '\0';
+ if (sscanf(devno, "%c%u:%u", &type, &maj, &min) != 3)
+ continue;
+
+ /* set sticky bit, so we do not remove the node on module unload */
+ if (type == 'c')
+ mode = 01600|S_IFCHR;
+ else if (type == 'b')
+ mode = 01600|S_IFBLK;
+ else
+ continue;
+
+ util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/", devname, NULL);
+ util_create_path_selinux(udev, filename);
+ udev_selinux_setfscreatecon(udev, filename, mode);
+ info(udev, "mknod '%s' %c%u:%u\n", filename, type, maj, min);
+ if (mknod(filename, mode, makedev(maj, min)) < 0 && errno == EEXIST)
+ utimensat(AT_FDCWD, filename, NULL, 0);
+ udev_selinux_resetfscreatecon(udev);
+ }
+
+ fclose(f);
+}
+
+static int copy_dev_dir(struct udev *udev, DIR *dir_from, DIR *dir_to, int maxdepth)
+{
+ struct dirent *dent;
+
+ for (dent = readdir(dir_from); dent != NULL; dent = readdir(dir_from)) {
+ struct stat stats;
+
+ if (dent->d_name[0] == '.')
+ continue;
+ if (fstatat(dirfd(dir_from), dent->d_name, &stats, AT_SYMLINK_NOFOLLOW) != 0)
+ continue;
+
+ if (S_ISBLK(stats.st_mode) || S_ISCHR(stats.st_mode)) {
+ udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, stats.st_mode & 0777);
+ if (mknodat(dirfd(dir_to), dent->d_name, stats.st_mode, stats.st_rdev) == 0) {
+ fchmodat(dirfd(dir_to), dent->d_name, stats.st_mode & 0777, 0);
+ fchownat(dirfd(dir_to), dent->d_name, stats.st_uid, stats.st_gid, 0);
+ } else {
+ utimensat(dirfd(dir_to), dent->d_name, NULL, 0);
+ }
+ udev_selinux_resetfscreatecon(udev);
+ } else if (S_ISLNK(stats.st_mode)) {
+ char target[UTIL_PATH_SIZE];
+ ssize_t len;
+
+ len = readlinkat(dirfd(dir_from), dent->d_name, target, sizeof(target));
+ if (len <= 0 || len == (ssize_t)sizeof(target))
+ continue;
+ target[len] = '\0';
+ udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, S_IFLNK);
+ if (symlinkat(target, dirfd(dir_to), dent->d_name) < 0 && errno == EEXIST)
+ utimensat(dirfd(dir_to), dent->d_name, NULL, AT_SYMLINK_NOFOLLOW);
+ udev_selinux_resetfscreatecon(udev);
+ } else if (S_ISDIR(stats.st_mode)) {
+ DIR *dir2_from, *dir2_to;
+
+ if (maxdepth == 0)
+ continue;
+
+ udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, S_IFDIR|0755);
+ mkdirat(dirfd(dir_to), dent->d_name, 0755);
+ udev_selinux_resetfscreatecon(udev);
+
+ dir2_to = fdopendir(openat(dirfd(dir_to), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));
+ if (dir2_to == NULL)
+ continue;
+
+ dir2_from = fdopendir(openat(dirfd(dir_from), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));
+ if (dir2_from == NULL) {
+ closedir(dir2_to);
+ continue;
+ }
+
+ copy_dev_dir(udev, dir2_from, dir2_to, maxdepth-1);
+
+ closedir(dir2_to);
+ closedir(dir2_from);
+ }
+ }
+
+ return 0;
+}
+
+static void static_dev_create_links(struct udev *udev, DIR *dir)
+{
+ struct stdlinks {
+ const char *link;
+ const char *target;
+ };
+ static const struct stdlinks stdlinks[] = {
+ { "core", "/proc/kcore" },
+ { "fd", "/proc/self/fd" },
+ { "stdin", "/proc/self/fd/0" },
+ { "stdout", "/proc/self/fd/1" },
+ { "stderr", "/proc/self/fd/2" },
+ };
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(stdlinks); i++) {
+ struct stat sb;
+
+ if (stat(stdlinks[i].target, &sb) == 0) {
+ udev_selinux_setfscreateconat(udev, dirfd(dir), stdlinks[i].link, S_IFLNK);
+ if (symlinkat(stdlinks[i].target, dirfd(dir), stdlinks[i].link) < 0 && errno == EEXIST)
+ utimensat(dirfd(dir), stdlinks[i].link, NULL, AT_SYMLINK_NOFOLLOW);
+ udev_selinux_resetfscreatecon(udev);
+ }
}
+}
+
+static void static_dev_create_from_devices(struct udev *udev, DIR *dir)
+{
+ DIR *dir_from;
+
+ dir_from = opendir(LIBEXECDIR "/devices");
+ if (dir_from == NULL)
+ return;
+ copy_dev_dir(udev, dir_from, dir, 8);
+ closedir(dir_from);
+}
+
+static void static_dev_create(struct udev *udev)
+{
+ DIR *dir;
+
+ dir = opendir(udev_get_dev_path(udev));
+ if (dir == NULL)
+ return;
+
+ static_dev_create_links(udev, dir);
+ static_dev_create_from_devices(udev, dir);
+
+ closedir(dir);
+}
+
+static int mem_size_mb(void)
+{
+ FILE *f;
+ char buf[4096];
+ long int memsize = -1;
- if (f != NULL)
+ f = fopen("/proc/meminfo", "r");
+ if (f == NULL)
+ return -1;
+
+ while (fgets(buf, sizeof(buf), f) != NULL) {
+ long int value;
+
+ if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
+ memsize = value / 1024;
+ break;
+ }
+ }
+
+ fclose(f);
+ return memsize;
+}
+
+static int convert_db(struct udev *udev)
+{
+ char filename[UTIL_PATH_SIZE];
+ FILE *f;
+ struct udev_enumerate *udev_enumerate;
+ struct udev_list_entry *list_entry;
+
+ /* current database */
+ util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/data", NULL);
+ if (access(filename, F_OK) >= 0)
+ return 0;
+
+ /* make sure we do not get here again */
+ util_create_path(udev, filename);
+ mkdir(filename, 0755);
+
+ /* old database */
+ util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/db", NULL);
+ if (access(filename, F_OK) < 0)
+ return 0;
+
+ f = fopen("/dev/kmsg", "w");
+ if (f != NULL) {
+ fprintf(f, "<30>udevd[%u]: converting old udev database\n", getpid());
fclose(f);
+ }
+
+ udev_enumerate = udev_enumerate_new(udev);
+ if (udev_enumerate == NULL)
+ return -1;
+ udev_enumerate_scan_devices(udev_enumerate);
+ udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) {
+ struct udev_device *device;
+
+ device = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry));
+ if (device == NULL)
+ continue;
+
+ /* try to find the old database for devices without a current one */
+ if (udev_device_read_db(device, NULL) < 0) {
+ bool have_db;
+ const char *id;
+ struct stat stats;
+ char devpath[UTIL_PATH_SIZE];
+ char from[UTIL_PATH_SIZE];
+
+ have_db = false;
+
+ /* find database in old location */
+ id = udev_device_get_id_filename(device);
+ util_strscpyl(from, sizeof(from), udev_get_dev_path(udev), "/.udev/db/", id, NULL);
+ if (lstat(from, &stats) == 0) {
+ if (!have_db) {
+ udev_device_read_db(device, from);
+ have_db = true;
+ }
+ unlink(from);
+ }
+
+ /* find old database with $subsys:$sysname name */
+ util_strscpyl(from, sizeof(from), udev_get_dev_path(udev),
+ "/.udev/db/", udev_device_get_subsystem(device), ":",
+ udev_device_get_sysname(device), NULL);
+ if (lstat(from, &stats) == 0) {
+ if (!have_db) {
+ udev_device_read_db(device, from);
+ have_db = true;
+ }
+ unlink(from);
+ }
+
+ /* find old database with the encoded devpath name */
+ util_path_encode(udev_device_get_devpath(device), devpath, sizeof(devpath));
+ util_strscpyl(from, sizeof(from), udev_get_dev_path(udev), "/.udev/db/", devpath, NULL);
+ if (lstat(from, &stats) == 0) {
+ if (!have_db) {
+ udev_device_read_db(device, from);
+ have_db = true;
+ }
+ unlink(from);
+ }
+
+ /* write out new database */
+ if (have_db)
+ udev_device_update_db(device);
+ }
+ udev_device_unref(device);
+ }
+ udev_enumerate_unref(udev_enumerate);
+ return 0;
+}
+
+static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
+{
+ int ctrl = -1, netlink = -1;
+ int fd, n;
+
+ n = sd_listen_fds(true);
+ if (n <= 0)
+ return -1;
+
+ for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
+ if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
+ if (ctrl >= 0)
+ return -1;
+ ctrl = fd;
+ continue;
+ }
+
+ if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
+ if (netlink >= 0)
+ return -1;
+ netlink = fd;
+ continue;
+ }
+
+ return -1;
+ }
+
+ if (ctrl < 0 || netlink < 0)
+ return -1;
+
+ info(udev, "ctrl=%i netlink=%i\n", ctrl, netlink);
+ *rctrl = ctrl;
+ *rnetlink = netlink;
+ return 0;
}
int main(int argc, char *argv[])
{
struct udev *udev;
- int fd;
+ FILE *f;
sigset_t mask;
- const char *value;
- int daemonize = 0;
+ int daemonize = false;
int resolve_names = 1;
static const struct option options[] = {
{ "daemon", no_argument, NULL, 'd' },
- { "debug-trace", no_argument, NULL, 't' },
{ "debug", no_argument, NULL, 'D' },
+ { "children-max", required_argument, NULL, 'c' },
+ { "exec-delay", required_argument, NULL, 'e' },
+ { "resolve-names", required_argument, NULL, 'N' },
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'V' },
- { "resolve-names", required_argument, NULL, 'N' },
{}
};
+ int fd_ctrl = -1;
+ int fd_netlink = -1;
+ int fd_worker = -1;
+ struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
+ struct udev_ctrl_connection *ctrl_conn = NULL;
int rc = 1;
udev = udev_new();
info(udev, "version %s\n", VERSION);
udev_selinux_init(udev);
- while (1) {
+ /* make sure, that our runtime dir exists and is writable */
+ if (utimensat(AT_FDCWD, udev_get_run_config_path(udev), NULL, 0) < 0) {
+ /* try to create our own subdirectory, do not create parent directories */
+ mkdir(udev_get_run_config_path(udev), 0755);
+
+ if (utimensat(AT_FDCWD, udev_get_run_config_path(udev), NULL, 0) >= 0) {
+ /* directory seems writable now */
+ udev_set_run_path(udev, udev_get_run_config_path(udev));
+ } else {
+ /* fall back to /dev/.udev */
+ char filename[UTIL_PATH_SIZE];
+
+ util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev", NULL);
+ if (udev_set_run_path(udev, filename) == NULL)
+ goto exit;
+ mkdir(udev_get_run_path(udev), 0755);
+ err(udev, "error: runtime directory '%s' not writable, for now falling back to '%s'",
+ udev_get_run_config_path(udev), udev_get_run_path(udev));
+ }
+ }
+ /* relabel runtime dir only if it resides below /dev */
+ if (strncmp(udev_get_run_path(udev), udev_get_dev_path(udev), strlen(udev_get_dev_path(udev))) == 0)
+ udev_selinux_lsetfilecon(udev, udev_get_run_path(udev), 0755);
+ info(udev, "runtime dir '%s'\n", udev_get_run_path(udev));
+
+ for (;;) {
int option;
- option = getopt_long(argc, argv, "dDthV", options, NULL);
+ option = getopt_long(argc, argv, "c:deDtN:hV", options, NULL);
if (option == -1)
break;
switch (option) {
case 'd':
- daemonize = 1;
+ daemonize = true;
+ break;
+ case 'c':
+ children_max = strtoul(optarg, NULL, 0);
break;
- case 't':
- debug_trace = 1;
+ case 'e':
+ exec_delay = strtoul(optarg, NULL, 0);
break;
case 'D':
- debug = 1;
+ debug = true;
if (udev_get_log_priority(udev) < LOG_INFO)
udev_set_log_priority(udev, LOG_INFO);
break;
}
break;
case 'h':
- printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
- "[--resolve-names=early|late|never] [--version]\n");
+ printf("Usage: udevd OPTIONS\n"
+ " --daemon\n"
+ " --debug\n"
+ " --children-max=<maximum number of workers>\n"
+ " --exec-delay=<seconds to wait before executing RUN=>\n"
+ " --resolve-names=early|late|never\n"
+ " --version\n"
+ " --help\n"
+ "\n");
goto exit;
case 'V':
printf("%s\n", VERSION);
}
}
+ /*
+ * read the kernel commandline, in case we need to get into debug mode
+ * udev.log-priority=<level> syslog priority
+ * udev.children-max=<number of workers> events are fully serialized if set to 1
+ *
+ */
+ f = fopen("/proc/cmdline", "r");
+ if (f != NULL) {
+ char cmdline[4096];
+
+ if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
+ char *pos;
+
+ pos = strstr(cmdline, "udev.log-priority=");
+ if (pos != NULL) {
+ pos += strlen("udev.log-priority=");
+ udev_set_log_priority(udev, util_log_priority(pos));
+ }
+
+ pos = strstr(cmdline, "udev.children-max=");
+ if (pos != NULL) {
+ pos += strlen("udev.children-max=");
+ children_max = strtoul(pos, NULL, 0);
+ }
+
+ pos = strstr(cmdline, "udev.exec-delay=");
+ if (pos != NULL) {
+ pos += strlen("udev.exec-delay=");
+ exec_delay = strtoul(pos, NULL, 0);
+ }
+ }
+ fclose(f);
+ }
+
if (getuid() != 0) {
fprintf(stderr, "root privileges required\n");
err(udev, "root privileges required\n");
goto exit;
}
- /* make sure std{in,out,err} fd's are in a sane state */
- fd = open("/dev/null", O_RDWR);
- if (fd < 0) {
- fprintf(stderr, "cannot open /dev/null\n");
- err(udev, "cannot open /dev/null\n");
+ /* set umask before creating any file/directory */
+ chdir("/");
+ umask(022);
+
+ /* create standard links, copy static nodes, create nodes from modules */
+ static_dev_create(udev);
+ static_dev_create_from_modules(udev);
+
+ /* before opening new files, make sure std{in,out,err} fds are in a sane state */
+ if (daemonize) {
+ int fd;
+
+ fd = open("/dev/null", O_RDWR);
+ if (fd >= 0) {
+ if (write(STDOUT_FILENO, 0, 0) < 0)
+ dup2(fd, STDOUT_FILENO);
+ if (write(STDERR_FILENO, 0, 0) < 0)
+ dup2(fd, STDERR_FILENO);
+ if (fd > STDERR_FILENO)
+ close(fd);
+ } else {
+ fprintf(stderr, "cannot open /dev/null\n");
+ err(udev, "cannot open /dev/null\n");
+ }
}
- if (write(STDOUT_FILENO, 0, 0) < 0)
- dup2(fd, STDOUT_FILENO);
- if (write(STDERR_FILENO, 0, 0) < 0)
- dup2(fd, STDERR_FILENO);
-
- /* 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;
+
+ if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
+ /* get control and netlink socket from from systemd */
+ udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
+ if (udev_ctrl == NULL) {
+ err(udev, "error taking over udev control socket");
+ rc = 1;
+ goto exit;
+ }
+
+ monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
+ if (monitor == NULL) {
+ err(udev, "error taking over netlink socket\n");
+ rc = 3;
+ goto exit;
+ }
+ } else {
+ /* open control and netlink socket */
+ udev_ctrl = udev_ctrl_new(udev);
+ if (udev_ctrl == NULL) {
+ fprintf(stderr, "error initializing udev control socket");
+ err(udev, "error initializing udev control socket");
+ rc = 1;
+ goto exit;
+ }
+ fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
+
+ monitor = udev_monitor_new_from_netlink(udev, "kernel");
+ if (monitor == NULL) {
+ fprintf(stderr, "error initializing netlink socket\n");
+ err(udev, "error initializing netlink socket\n");
+ rc = 3;
+ goto exit;
+ }
+ fd_netlink = udev_monitor_get_fd(monitor);
+ }
+
+ if (udev_monitor_enable_receiving(monitor) < 0) {
+ fprintf(stderr, "error binding netlink socket\n");
+ err(udev, "error binding netlink socket\n");
+ rc = 3;
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");
+ fprintf(stderr, "error binding udev control socket\n");
+ err(udev, "error binding udev control socket\n");
rc = 1;
goto exit;
}
- pfd[FD_CONTROL].fd = udev_ctrl_get_fd(udev_ctrl);
- 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;
+ udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
+
+ /* create queue file before signalling 'ready', to make sure we block 'settle' */
+ udev_queue_export = udev_queue_export_new(udev);
+ if (udev_queue_export == NULL) {
+ err(udev, "error creating queue file\n");
goto exit;
}
- 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) {
+ if (daemonize) {
+ pid_t pid;
+ int fd;
+
+ pid = fork();
+ switch (pid) {
+ case 0:
+ break;
+ case -1:
+ err(udev, "fork of daemon failed: %m\n");
+ rc = 4;
+ goto exit;
+ default:
+ rc = EXIT_SUCCESS;
+ goto exit_daemonize;
+ }
+
+ setsid();
+
+ fd = open("/proc/self/oom_score_adj", O_RDWR);
+ if (fd < 0) {
+ /* Fallback to old interface */
+ fd = open("/proc/self/oom_adj", O_RDWR);
+ if (fd < 0) {
+ err(udev, "error disabling OOM: %m\n");
+ } else {
+ /* OOM_DISABLE == -17 */
+ write(fd, "-17", 3);
+ close(fd);
+ }
+ } else {
+ write(fd, "-1000", 5);
+ close(fd);
+ }
+ } else {
+ sd_notify(1, "READY=1");
+ }
+
+ f = fopen("/dev/kmsg", "w");
+ if (f != NULL) {
+ fprintf(f, "<30>udevd[%u]: starting version " VERSION "\n", getpid());
+ fclose(f);
+ }
+
+ if (!debug) {
+ int fd;
+
+ fd = open("/dev/null", O_RDWR);
+ if (fd >= 0) {
+ dup2(fd, STDIN_FILENO);
+ dup2(fd, STDOUT_FILENO);
+ dup2(fd, STDERR_FILENO);
+ close(fd);
+ }
+ }
+
+ fd_inotify = udev_watch_init(udev);
+ if (fd_inotify < 0) {
fprintf(stderr, "error initializing inotify\n");
err(udev, "error initializing inotify\n");
rc = 4;
}
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);
+ inotify_add_watch(fd_inotify, udev_get_rules_path(udev),
+ IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
} else {
char filename[UTIL_PATH_SIZE];
+ struct stat statbuf;
- 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);
+ inotify_add_watch(fd_inotify, LIBEXECDIR "/rules.d",
+ IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
+ inotify_add_watch(fd_inotify, SYSCONFDIR "/udev/rules.d",
+ 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);
+ util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/rules.d", NULL);
+ if (stat(filename, &statbuf) != 0) {
+ util_create_path(udev, filename);
+ mkdir(filename, 0755);
+ }
+ inotify_add_watch(fd_inotify, filename,
+ 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");
+ sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
+ fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
+ if (fd_signal < 0) {
+ fprintf(stderr, "error creating signalfd\n");
+ err(udev, "error creating 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");
+ if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
+ fprintf(stderr, "error creating socketpair\n");
+ err(udev, "error creating socketpair\n");
rc = 6;
goto exit;
}
- pfd[FD_WORKER].fd = worker_watch[READ_END];
- util_set_fd_cloexec(worker_watch[WRITE_END]);
+ fd_worker = worker_watch[READ_END];
+
+ udev_builtin_load(udev);
rules = udev_rules_new(udev, resolve_names);
if (rules == NULL) {
goto exit;
}
- udev_queue_export = udev_queue_export_new(udev);
- if (udev_queue_export == NULL) {
- err(udev, "error creating queue file\n");
- goto exit;
- }
+ memset(&ep_ctrl, 0, sizeof(struct epoll_event));
+ ep_ctrl.events = EPOLLIN;
+ ep_ctrl.data.fd = fd_ctrl;
- if (daemonize) {
- pid_t pid;
+ memset(&ep_inotify, 0, sizeof(struct epoll_event));
+ ep_inotify.events = EPOLLIN;
+ ep_inotify.data.fd = fd_inotify;
- pid = fork();
- switch (pid) {
- case 0:
- break;
- case -1:
- err(udev, "fork of daemon failed: %m\n");
- rc = 4;
- goto exit;
- default:
- rc = 0;
- goto exit;
- }
- }
+ memset(&ep_signal, 0, sizeof(struct epoll_event));
+ ep_signal.events = EPOLLIN;
+ ep_signal.data.fd = fd_signal;
- startup_log(udev);
+ memset(&ep_netlink, 0, sizeof(struct epoll_event));
+ ep_netlink.events = EPOLLIN;
+ ep_netlink.data.fd = fd_netlink;
- /* redirect std{out,err} */
- if (!debug && !debug_trace) {
- dup2(fd, STDIN_FILENO);
- dup2(fd, STDOUT_FILENO);
- dup2(fd, STDERR_FILENO);
- }
- if (fd > STDERR_FILENO)
- close(fd);
-
- /* set scheduling priority for the daemon */
- setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
-
- chdir("/");
- umask(022);
- setsid();
+ memset(&ep_worker, 0, sizeof(struct epoll_event));
+ ep_worker.events = EPOLLIN;
+ ep_worker.data.fd = fd_worker;
- /* OOM_DISABLE == -17 */
- fd = open("/proc/self/oom_adj", O_RDWR);
- if (fd < 0) {
- err(udev, "error disabling OOM: %m\n");
- } else {
- write(fd, "-17", 3);
- close(fd);
+ fd_ep = epoll_create1(EPOLL_CLOEXEC);
+ if (fd_ep < 0) {
+ err(udev, "error creating epoll fd: %m\n");
+ goto exit;
+ }
+ if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
+ epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
+ epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
+ epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
+ epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
+ err(udev, "fail to add fds to epoll: %m\n");
+ goto exit;
}
- /* in trace mode run one event after the other */
- if (debug_trace) {
- max_childs = 1;
- } else {
+ /* if needed, convert old database from earlier udev version */
+ convert_db(udev);
+
+ if (children_max <= 0) {
int memsize = mem_size_mb();
+ /* set value depending on the amount of RAM */
if (memsize > 0)
- max_childs = 128 + (memsize / 8);
+ children_max = 128 + (memsize / 8);
else
- max_childs = 128;
+ children_max = 128;
}
+ info(udev, "set children_max to %u\n", children_max);
- /* 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_rules_apply_static_dev_perms(rules);
- udev_list_init(&event_list);
- udev_list_init(&worker_list);
+ udev_list_node_init(&event_list);
+ udev_list_node_init(&worker_list);
- while (!udev_exit) {
+ for (;;) {
+ struct epoll_event ev[8];
int fdcount;
int timeout;
+ bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
+ int i;
+
+ if (udev_exit) {
+ /* close sources of new events and discard buffered events */
+ if (fd_ctrl >= 0) {
+ epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
+ fd_ctrl = -1;
+ }
+ if (monitor != NULL) {
+ epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
+ udev_monitor_unref(monitor);
+ monitor = NULL;
+ }
+ if (fd_inotify >= 0) {
+ epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
+ close(fd_inotify);
+ fd_inotify = -1;
+ }
+
+ /* discard queued events and kill workers */
+ event_queue_cleanup(udev, EVENT_QUEUED);
+ worker_kill(udev, 0);
- /* set timeout to kill idle workers */
- if (udev_list_is_empty(&event_list) && childs > 2)
+ /* exit after all has cleaned up */
+ if (udev_list_node_is_empty(&event_list) && udev_list_node_is_empty(&worker_list))
+ break;
+
+ /* timeout at exit for workers to finish */
+ timeout = 60 * 1000;
+ } else if (udev_list_node_is_empty(&event_list) && children > 2) {
+ /* set timeout to kill idle workers */
timeout = 3 * 1000;
- else
+ } else {
timeout = -1;
- /* wait for events */
- fdcount = poll(pfd, ARRAY_SIZE(pfd), timeout);
+ }
+ fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), timeout);
if (fdcount < 0)
continue;
- /* timeout - kill idle workers */
- if (fdcount == 0)
- worker_kill(2);
+ if (fdcount == 0) {
+ if (udev_exit) {
+ info(udev, "timeout, giving up waiting for workers to finish\n");
+ break;
+ }
+
+ /* timeout - kill idle workers */
+ worker_kill(udev, 2);
+ }
+
+ is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
+ for (i = 0; i < fdcount; i++) {
+ if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
+ is_worker = true;
+ else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
+ is_netlink = true;
+ else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
+ is_signal = true;
+ else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
+ is_inotify = true;
+ else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
+ is_ctrl = true;
+ }
/* event has finished */
- if (pfd[FD_WORKER].revents & POLLIN)
- worker_returned();
+ if (is_worker)
+ worker_returned(fd_worker);
- /* get kernel uevent */
- if (pfd[FD_NETLINK].revents & POLLIN) {
+ if (is_netlink) {
struct udev_device *dev;
dev = udev_monitor_receive_device(monitor);
- if (dev != NULL)
- event_queue_insert(dev);
- else
- udev_device_unref(dev);
+ if (dev != NULL) {
+ udev_device_set_usec_initialized(dev, now_usec());
+ if (event_queue_insert(dev) < 0)
+ udev_device_unref(dev);
+ }
}
/* start new events */
- if (!udev_list_is_empty(&event_list) && !stop_exec_queue)
- events_start(udev);
+ if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue)
+ event_queue_start(udev);
- /* get signal */
- if (pfd[FD_SIGNAL].revents & POLLIN) {
+ if (is_signal) {
struct signalfd_siginfo fdsi;
ssize_t size;
- size = read(pfd[FD_SIGNAL].fd, &fdsi, sizeof(struct signalfd_siginfo));
+ size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
if (size == sizeof(struct signalfd_siginfo))
handle_signal(udev, fdsi.ssi_signo);
}
+ /* we are shutting down, the events below are not handled anymore */
+ if (udev_exit)
+ continue;
+
/* device node and rules directory inotify watch */
- if (pfd[FD_INOTIFY].revents & POLLIN)
+ if (is_inotify)
handle_inotify(udev);
/*
- * 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
+ * that the ping is send back after the possibly generated
* "change" events by the inotify device node watch.
+ *
+ * A single time we may receive a client connection which we need to
+ * keep open to block the client. It will be closed right before we
+ * exit.
*/
- if (pfd[FD_CONTROL].revents & POLLIN)
- handle_ctrl_msg(udev_ctrl);
+ if (is_ctrl)
+ ctrl_conn = handle_ctrl_msg(udev_ctrl);
/* rules changed, set by inotify or a HUP signal */
if (reload_config) {
struct udev_rules *rules_new;
- worker_kill(0);
+ worker_kill(udev, 0);
rules_new = udev_rules_new(udev, resolve_names);
if (rules_new != NULL) {
udev_rules_unref(rules);
}
}
- udev_queue_export_cleanup(udev_queue_export);
- rc = 0;
+ rc = EXIT_SUCCESS;
exit:
- udev_queue_export_unref(udev_queue_export);
+ udev_queue_export_cleanup(udev_queue_export);
+ udev_ctrl_cleanup(udev_ctrl);
+exit_daemonize:
+ if (fd_ep >= 0)
+ close(fd_ep);
+ worker_list_cleanup(udev);
+ event_queue_cleanup(udev, EVENT_UNDEF);
udev_rules_unref(rules);
- udev_ctrl_unref(udev_ctrl);
- if (pfd[FD_SIGNAL].fd >= 0)
- close(pfd[FD_SIGNAL].fd);
+ udev_builtin_unload(udev);
+ if (fd_signal >= 0)
+ close(fd_signal);
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_queue_export_unref(udev_queue_export);
+ udev_ctrl_connection_unref(ctrl_conn);
+ udev_ctrl_unref(udev_ctrl);
udev_selinux_exit(udev);
udev_unref(udev);
udev_log_close();
~ianmdlvl / elogind.git / blobdiff