/*
- * Copyright (C) 2004-2006 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>
*
- * 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
+#include <stdbool.h>
#include <string.h>
#include <ctype.h>
-#include <dirent.h>
#include <fcntl.h>
-#include <syslog.h>
#include <time.h>
#include <getopt.h>
+#include <dirent.h>
+#include <sys/time.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/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 "udev_selinux.h"
#define UDEVD_PRIORITY -4
#define UDEV_PRIORITY -2
-/* maximum limit of forked childs */
-#define UDEVD_MAX_CHILDS 256
-/* start to throttle forking if maximum number of running childs in our session is reached */
-#define UDEVD_MAX_CHILDS_RUNNING 16
-
-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 timeval tv;
+ struct timezone tz;
+
+ vsnprintf(buf, sizeof(buf), format, args);
+ gettimeofday(&tv, &tz);
+ fprintf(stderr, "%llu.%06u [%u] %s: %s",
+ (unsigned long long) tv.tv_sec, (unsigned int) tv.tv_usec,
+ (int) getpid(), fn, buf);
} else {
vsyslog(priority, format, args);
}
}
-struct udevd_uevent_msg {
- struct udev *udev;
- struct list_head node;
- pid_t pid;
- int exitstatus;
- time_t queue_time;
- char *action;
- char *devpath;
- char *subsystem;
- char *driver;
- dev_t devt;
- unsigned long long seqnum;
- char *devpath_old;
- char *physdevpath;
- unsigned int timeout;
- char *envp[UEVENT_NUM_ENVP+1];
- char envbuf[];
-};
-
-static int debug_trace;
-static struct udev_rules rules;
+static bool debug_trace;
+static struct udev_rules *rules;
+static struct udev_queue_export *udev_queue_export;
static struct udev_ctrl *udev_ctrl;
-static int uevent_netlink_sock = -1;
-static int inotify_fd = -1;
-static pid_t sid;
-
-static int signal_pipe[2] = {-1, -1};
-static volatile int sigchilds_waiting;
-static volatile int udev_exit;
-static volatile int reload_config;
-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 bool stop_exec_queue;
+static bool reload_config;
static int max_childs;
-static int max_childs_running;
-static char udev_log_env[32];
+static int childs;
+static sigset_t orig_sigmask;
+static struct udev_list_node event_list;
+static struct udev_list_node worker_list;
+static bool udev_exit;
+static volatile sig_atomic_t worker_exit;
+
+enum poll_fd {
+ FD_CONTROL,
+ FD_NETLINK,
+ FD_INOTIFY,
+ FD_SIGNAL,
+ FD_WORKER,
+};
-static LIST_HEAD(exec_list);
-static LIST_HEAD(running_list);
+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 void asmlinkage udev_event_sig_handler(int signum)
+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;
+ dev_t devnum;
+ bool is_block;
+};
+
+static struct event *node_to_event(struct udev_list_node *node)
{
- if (signum == SIGALRM)
- exit(1);
+ char *event;
+
+ event = (char *)node;
+ event -= offsetof(struct event, node);
+ return (struct event *)event;
}
-static int udev_event_process(struct udevd_uevent_msg *msg)
-{
- struct sigaction act;
- struct udevice *udevice;
- 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]);
-
- udevice = udev_device_init(msg->udev);
- if (udevice == NULL)
- return -1;
- strlcpy(udevice->action, msg->action, sizeof(udevice->action));
- sysfs_device_set_values(udevice->udev, udevice->dev, msg->devpath, msg->subsystem, msg->driver);
- udevice->devpath_old = msg->devpath_old;
- udevice->devt = msg->devt;
+enum worker_state {
+ WORKER_UNDEF,
+ WORKER_RUNNING,
+ WORKER_IDLE,
+ WORKER_KILLED,
+};
- retval = udev_device_event(&rules, udevice);
+struct worker {
+ struct udev_list_node node;
+ struct udev *udev;
+ int refcount;
+ pid_t pid;
+ struct udev_monitor *monitor;
+ enum worker_state state;
+ struct event *event;
+};
- /* rules may change/disable the timeout */
- if (udevice->event_timeout >= 0)
- alarm(udevice->event_timeout);
+/* passed from worker to main process */
+struct worker_message {
+ pid_t pid;
+ int exitcode;
+};
- /* run programs collected by RUN-key*/
- if (retval == 0 && !udevice->ignore_device && udev_get_run(msg->udev))
- retval = udev_rules_run(udevice);
+static struct worker *node_to_worker(struct udev_list_node *node)
+{
+ char *worker;
- udev_device_cleanup(udevice);
- return retval;
+ worker = (char *)node;
+ worker -= offsetof(struct worker, node);
+ return (struct worker *)worker;
}
-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 event_queue_delete(struct event *event)
{
- char filename[PATH_SIZE];
- char filename_failed[PATH_SIZE];
- size_t start;
-
- /* location of queue file */
- snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu", udev_get_dev_path(msg->udev), msg->seqnum);
-
- /* location of failed file */
- strlcpy(filename_failed, udev_get_dev_path(msg->udev), 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);
-
- switch (state) {
- case EVENT_QUEUED:
- unlink(filename_failed);
- delete_path(msg->udev, filename_failed);
- create_path(msg->udev, filename);
- selinux_setfscreatecon(msg->udev, filename, NULL, S_IFLNK);
- symlink(msg->devpath, filename);
- selinux_resetfscreatecon(msg->udev);
- break;
- case EVENT_FINISHED:
- if (msg->devpath_old != NULL) {
- /* "move" event - rename failed file to current name, do not delete failed */
- char filename_failed_old[PATH_SIZE];
-
- strlcpy(filename_failed_old, udev_get_dev_path(msg->udev), 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);
-
- if (rename(filename_failed_old, filename_failed) == 0)
- info(msg->udev, "renamed devpath, moved failed state of '%s' to %s'\n",
- msg->devpath_old, msg->devpath);
- } else {
- unlink(filename_failed);
- delete_path(msg->udev, filename_failed);
- }
+ udev_list_node_remove(&event->node);
- unlink(filename);
- delete_path(msg->udev, filename);
- break;
- case EVENT_FAILED:
- /* move failed event to the failed directory */
- create_path(msg->udev, filename_failed);
- rename(filename, filename_failed);
+ /* mark as failed, if "add" event returns non-zero */
+ if (event->exitcode != 0 && 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);
+
+ info(event->udev, "seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode);
+ udev_device_unref(event->dev);
+ free(event);
+}
- /* clean up possibly empty queue directory */
- delete_path(msg->udev, filename);
+static void event_sig_handler(int signum)
+{
+ switch (signum) {
+ case SIGALRM:
+ _exit(1);
+ break;
+ case SIGTERM:
+ worker_exit = true;
break;
}
-
- return;
}
-static void msg_queue_delete(struct udevd_uevent_msg *msg)
+static struct worker *worker_ref(struct worker *worker)
{
- list_del(&msg->node);
+ worker->refcount++;
+ return worker;
+}
- /* mark as failed, if "add" event returns non-zero */
- if (msg->exitstatus && strcmp(msg->action, "add") == 0)
- export_event_state(msg, EVENT_FAILED);
- else
- export_event_state(msg, EVENT_FINISHED);
+static void worker_unref(struct worker *worker)
+{
+ worker->refcount--;
+ if (worker->refcount > 0)
+ return;
- free(msg);
+ udev_list_node_remove(&worker->node);
+ udev_monitor_unref(worker->monitor);
+ childs--;
+ info(worker->udev, "worker [%u] cleaned up\n", worker->pid);
+ free(worker);
}
-static void udev_event_run(struct udevd_uevent_msg *msg)
+static void worker_new(struct event *event)
{
+ struct worker *worker;
+ struct udev_monitor *worker_monitor;
pid_t pid;
- int retval;
+ struct sigaction act;
+
+ /* 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;
+ /* worker + event reference */
+ worker->refcount = 2;
+ worker->udev = event->udev;
pid = fork();
switch (pid) {
- case 0:
- /* child */
- close(uevent_netlink_sock);
+ case 0: {
+ sigset_t sigmask;
+ struct udev_device *dev;
+ struct pollfd pmon = {
+ .fd = udev_monitor_get_fd(worker_monitor),
+ .events = POLLIN,
+ };
+
+ udev_queue_export_unref(udev_queue_export);
+ udev_monitor_unref(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");
+ close(pfd[FD_SIGNAL].fd);
+ close(worker_watch[READ_END]);
+ udev_log_close();
+ udev_log_init("udevd-work");
setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
- retval = udev_event_process(msg);
- info(msg->udev, "seq %llu finished with %i\n", msg->seqnum, retval);
+ /* 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 SIGALRM */
+ sigfillset(&sigmask);
+ sigdelset(&sigmask, SIGALRM);
+ sigprocmask(SIG_SETMASK, &sigmask, NULL);
+ /* SIGTERM is unblocked in ppoll() */
+ sigdelset(&sigmask, SIGTERM);
+
+ /* request TERM signal if parent exits */
+ prctl(PR_SET_PDEATHSIG, SIGTERM);
+
+ /* initial device */
+ dev = event->dev;
+
+ do {
+ struct udev_event *udev_event;
+ struct worker_message msg = {};
+ int err;
+ int failed = 0;
+
+ info(event->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);
+
+ /* 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))
+ failed = udev_event_execute_run(udev_event,
+ &orig_sigmask);
+
+ /* 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);
+ }
- logging_close();
- if (retval)
- exit(1);
+ /* send processed event back to libudev listeners */
+ udev_monitor_send_device(worker_monitor, NULL, dev);
+
+ /* send back the result of the event execution */
+ if (err != 0)
+ msg.exitcode = err;
+ else if (failed != 0)
+ msg.exitcode = failed;
+ msg.pid = getpid();
+ send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
+
+ info(event->udev, "seq %llu processed with %i\n", udev_device_get_seqnum(dev), err);
+ udev_event_unref(udev_event);
+ udev_device_unref(dev);
+ dev = NULL;
+
+ /* wait for more device messages or signal from udevd */
+ while (!worker_exit) {
+ int fdcount;
+
+ fdcount = ppoll(&pmon, 1, NULL, &sigmask);
+ if (fdcount < 0)
+ continue;
+
+ if (pmon.revents & POLLIN) {
+ dev = udev_monitor_receive_device(worker_monitor);
+ if (dev != NULL)
+ break;
+ }
+ }
+ } while (dev != NULL);
+
+ udev_monitor_unref(worker_monitor);
+ udev_log_close();
exit(0);
+ }
case -1:
- err(msg->udev, "fork of child failed: %s\n", strerror(errno));
- msg_queue_delete(msg);
+ udev_monitor_unref(worker_monitor);
+ event->state = EVENT_QUEUED;
+ free(worker);
+ err(event->udev, "fork of child failed: %m\n");
break;
default:
- /* get SIGCHLD in main loop */
- info(msg->udev, "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;
+ /* 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++;
+ info(event->udev, "seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid);
+ break;
}
}
-static void msg_queue_insert(struct udevd_uevent_msg *msg)
+static void event_run(struct event *event)
{
- char filename[PATH_SIZE];
- int fd;
-
- msg->queue_time = time(NULL);
-
- export_event_state(msg, EVENT_QUEUED);
- info(msg->udev, "seq %llu queued, '%s' '%s'\n", msg->seqnum, msg->action, msg->subsystem);
+ struct udev_list_node *loop;
- strlcpy(filename, udev_get_dev_path(msg->udev), sizeof(filename));
- 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;
+ udev_list_node_foreach(loop, &worker_list) {
+ struct worker *worker = node_to_worker(loop);
+ ssize_t count;
- len = sprintf(str, "%llu\n", msg->seqnum);
- write(fd, str, len);
- close(fd);
- }
+ if (worker->state != WORKER_IDLE)
+ continue;
- /* 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);
+ count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
+ if (count < 0) {
+ 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;
}
- /* run all events with a timeout set immediately */
- if (msg->timeout != 0) {
- list_add_tail(&msg->node, &running_list);
- udev_event_run(msg);
+ if (childs >= max_childs) {
+ info(event->udev, "maximum number (%i) of childs reached\n", childs);
return;
}
- list_add_tail(&msg->node, &exec_list);
- run_exec_q = 1;
+ /* start new worker and pass initial device */
+ worker_new(event);
}
-static int mem_size_mb(void)
+static void event_queue_insert(struct udev_device *dev)
{
- FILE* f;
- char buf[4096];
- long int memsize = -1;
+ struct event *event;
- f = fopen("/proc/meminfo", "r");
- if (f == NULL)
- return -1;
+ event = calloc(1, sizeof(struct event));
+ if (event == NULL)
+ return;
- while (fgets(buf, sizeof(buf), f) != NULL) {
- long int value;
+ 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);
+ event->devnum = udev_device_get_devnum(dev);
+ event->is_block = (strcmp("block", udev_device_get_subsystem(dev)) == 0);
- if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
- memsize = value / 1024;
- break;
- }
- }
+ 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));
- fclose(f);
- return memsize;
+ event->state = EVENT_QUEUED;
+ udev_list_node_append(&event->node, &event_list);
+
+ /* run all events with a timeout set immediately */
+ if (udev_device_get_timeout(dev) > 0) {
+ worker_new(event);
+ return;
+ }
}
-static int cpu_count(void)
+static void worker_kill(struct udev *udev, int retain)
{
- FILE* f;
- char buf[4096];
- int count = 0;
+ struct udev_list_node *loop;
+ int max;
- f = fopen("/proc/stat", "r");
- if (f == NULL)
- return -1;
+ if (childs <= retain)
+ return;
- while (fgets(buf, sizeof(buf), f) != NULL) {
- if (strncmp(buf, "cpu", 3) == 0 && isdigit(buf[3]))
- count++;
- }
+ max = childs - retain;
- fclose(f);
- if (count == 0)
- return -1;
- return count;
+ 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 running_processes(void)
+static int mem_size_mb(void)
{
- FILE* f;
+ FILE *f;
char buf[4096];
- int running = -1;
+ long int memsize = -1;
- f = fopen("/proc/stat", "r");
+ f = fopen("/proc/meminfo", "r");
if (f == NULL)
return -1;
while (fgets(buf, sizeof(buf), f) != NULL) {
- int value;
+ long int value;
- if (sscanf(buf, "procs_running %u", &value) == 1) {
- running = value;
+ if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
+ memsize = value / 1024;
break;
}
}
fclose(f);
- return running;
+ return memsize;
}
-/* return the number of process es in our session, count only until limit */
-static int running_processes_in_session(pid_t session, int limit)
+/* lookup event for identical, parent, child device */
+static bool is_devpath_busy(struct event *event)
{
- DIR *dir;
- struct dirent *dent;
- int running = 0;
+ struct udev_list_node *loop;
+ size_t common;
- dir = opendir("/proc");
- if (!dir)
- return -1;
+ /* check if queue contains events we depend on */
+ udev_list_node_foreach(loop, &event_list) {
+ struct event *loop_event = node_to_event(loop);
- /* 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]))
+ /* we already found a later event, earlier can not block us, no need to check again */
+ if (loop_event->seqnum < event->delaying_seqnum)
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;
+ /* event we checked earlier still exists, no need to check again */
+ if (loop_event->seqnum == event->delaying_seqnum)
+ return true;
- 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)
+ /* found ourself, no later event can block us */
+ if (loop_event->seqnum >= event->seqnum)
break;
- }
- closedir(dir);
-
- return running;
-}
-static int compare_devpath(const char *running, const char *waiting)
-{
- int i;
-
- for (i = 0; i < PATH_SIZE; 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 */
- if (running[i] != waiting[i])
- break;
- }
-
- return 0;
-}
-
-/* lookup event for identical, parent, child, or physical device */
-static int devpath_busy(struct udevd_uevent_msg *msg, int limit)
-{
- struct udevd_uevent_msg *loop_msg;
- 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) {
- /* skip ourself and all later events */
- if (loop_msg->seqnum >= msg->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 our old name */
- if (msg->devpath_old != NULL)
- if (strcmp(loop_msg->devpath , msg->devpath_old) == 0)
- return 2;
-
- /* check identical, parent, or child device event */
- if (compare_devpath(loop_msg->devpath, msg->devpath) != 0) {
- dbg(msg->udev, "%llu, device event still pending %llu (%s)\n",
- msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
- return 3;
+ if (event->devpath_old != NULL && strcmp(loop_event->devpath, event->devpath_old) == 0) {
+ event->delaying_seqnum = loop_event->seqnum;
+ return true;
}
- /* check for our major:minor number */
- if (msg->devt && loop_msg->devt == msg->devt &&
- strcmp(msg->subsystem, loop_msg->subsystem) == 0) {
- dbg(msg->udev, "%llu, device event still pending %llu (%d:%d)\n", msg->seqnum,
- loop_msg->seqnum, major(loop_msg->devt), minor(loop_msg->devt));
- return 4;
- }
+ /* compare devpath */
+ common = MIN(loop_event->devpath_len, event->devpath_len);
- /* 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(msg->udev, "%llu, physical device event still pending %llu (%s)\n",
- msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
- return 5;
- }
- }
+ /* one devpath is contained in the other? */
+ if (memcmp(loop_event->devpath, event->devpath, common) != 0)
+ continue;
- /* check run queue for still running events */
- list_for_each_entry(loop_msg, &running_list, node) {
- if (limit && childs_count++ > limit) {
- dbg(msg->udev, "%llu, maximum number (%i) of childs reached\n", msg->seqnum, childs_count);
- return 1;
+ /* identical device event found */
+ if (loop_event->devpath_len == event->devpath_len) {
+ event->delaying_seqnum = loop_event->seqnum;
+ return true;
}
- /* check our old name */
- if (msg->devpath_old != NULL)
- if (strcmp(loop_msg->devpath , msg->devpath_old) == 0)
- return 2;
-
- /* check identical, parent, or child device event */
- if (compare_devpath(loop_msg->devpath, msg->devpath) != 0) {
- dbg(msg->udev, "%llu, device event still running %llu (%s)\n",
- msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
- return 3;
+ /* parent device event found */
+ if (event->devpath[common] == '/') {
+ event->delaying_seqnum = loop_event->seqnum;
+ return true;
}
- /* check for our major:minor number */
- if (msg->devt && loop_msg->devt == msg->devt &&
- strcmp(msg->subsystem, loop_msg->subsystem) == 0) {
- dbg(msg->udev, "%llu, device event still running %llu (%d:%d)\n", msg->seqnum,
- loop_msg->seqnum, major(loop_msg->devt), minor(loop_msg->devt));
- return 4;
+ /* child device event found */
+ if (loop_event->devpath[common] == '/') {
+ event->delaying_seqnum = loop_event->seqnum;
+ return true;
}
- /* 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(msg->udev, "%llu, physical device event still running %llu (%s)\n",
- msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
- return 5;
- }
+ /* no matching device */
+ continue;
}
- return 0;
+
+ return false;
}
-/* serializes events for the identical and parent and child devices */
-static void msg_queue_manager(struct udev *udev)
+static void events_start(struct udev *udev)
{
- struct udevd_uevent_msg *loop_msg;
- struct udevd_uevent_msg *tmp_msg;
- int running;
+ struct udev_list_node *loop;
- if (list_empty(&exec_list))
- return;
+ udev_list_node_foreach(loop, &event_list) {
+ struct event *event = node_to_event(loop);
- running = running_processes();
- dbg(udev, "%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(udev, "at least %d processes running in session\n", running);
- if (running >= max_childs_running) {
- dbg(udev, "delay seq %llu, too many processes already running\n", loop_msg->seqnum);
- return;
- }
- }
+ if (event->state != EVENT_QUEUED)
+ continue;
- /* serialize and wait for parent or child events */
- if (devpath_busy(loop_msg, max_childs) != 0) {
- dbg(udev, "delay seq %llu (%s)\n", loop_msg->seqnum, loop_msg->devpath);
+ /* do not start event if parent or child event is still running */
+ if (is_devpath_busy(event)) {
+ dbg(udev, "delay seq %llu (%s)\n", event->seqnum, event->devpath);
continue;
}
- /* move event to run list */
- list_move_tail(&loop_msg->node, &running_list);
- udev_event_run(loop_msg);
- running++;
- dbg(udev, "moved seq %llu to running list\n", loop_msg->seqnum);
+ event_run(event);
}
}
-static struct udevd_uevent_msg *get_msg_from_envbuf(struct udev *udev, const char *buf, int buf_size)
+static void worker_returned(void)
{
- 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);
- msg->udev = udev;
-
- /* 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;
+ while (1) {
+ struct worker_message msg;
+ ssize_t size;
+ struct udev_list_node *loop;
- key = &msg->envbuf[bufpos];
- keylen = strlen(key);
- msg->envp[i] = key;
- bufpos += keylen + 1;
- dbg(udev, "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";
+ size = recv(pfd[FD_WORKER].fd, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
+ if (size != sizeof(struct worker_message))
+ break;
- 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];
- }
+ /* lookup worker who sent the signal */
+ udev_list_node_foreach(loop, &worker_list) {
+ struct worker *worker = node_to_worker(loop);
- msg->envp[i] = NULL;
+ if (worker->pid != msg.pid)
+ continue;
- if (msg->devpath == NULL || msg->action == NULL) {
- info(udev, "DEVPATH or ACTION missing, ignore message\n");
- free(msg);
- return NULL;
+ /* worker returned */
+ worker->event->exitcode = msg.exitcode;
+ event_queue_delete(worker->event);
+ worker->event = NULL;
+ if (worker->state != WORKER_KILLED)
+ worker->state = WORKER_IDLE;
+ worker_unref(worker);
+ break;
+ }
}
- return msg;
}
/* receive the udevd message from userspace */
if (i >= 0) {
info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
udev_set_log_priority(udev, i);
- sprintf(udev_log_env, "UDEV_LOG=%i", i);
- putenv(udev_log_env);
+ 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_q = 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_q = 0;
- msg_queue_manager(udev);
+ 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);
if (str != NULL) {
- char *key = strdup(str);
- char *val;
-
- val = strchr(str, '=');
- if (val != NULL) {
- val[0] = '\0';
- val = &val[1];
- if (val[0] == '\0') {
- info(udev, "udevd message (ENV) received, unset '%s'\n", key);
- unsetenv(str);
+ char *key;
+
+ 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 {
- info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
- setenv(key, val, 1);
+ err(udev, "wrong key format '%s'\n", key);
}
- } else {
- err(udev, "wrong key format '%s'\n", key);
+ free(key);
}
- free(key);
+ worker_kill(udev, 0);
}
i = udev_ctrl_get_set_max_childs(ctrl_msg);
max_childs = i;
}
- i = udev_ctrl_get_set_max_childs_running(ctrl_msg);
- if (i > 0) {
- info(udev, "udevd message (SET_MAX_CHILDS_RUNNING) received, max_childs_running=%i\n", i);
- max_childs_running = 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;
}
-
udev_ctrl_msg_unref(ctrl_msg);
}
-/* receive the kernel user event message and do some sanity checks */
-static struct udevd_uevent_msg *get_netlink_msg(struct udev *udev)
+/* read inotify messages */
+static int handle_inotify(struct udev *udev)
{
- 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(udev, "unable to receive kernel netlink message: %s\n", strerror(errno));
- return NULL;
- }
+ int nbytes, pos;
+ char *buf;
+ struct inotify_event *ev;
- if ((size_t)size > sizeof(buffer)-1)
- size = sizeof(buffer)-1;
- buffer[size] = '\0';
- dbg(udev, "uevent_size=%zi\n", size);
-
- /* start of event payload */
- bufpos = strlen(buffer)+1;
- msg = get_msg_from_envbuf(udev, &buffer[bufpos], size-bufpos);
- if (msg == NULL)
- return NULL;
-
- /* validate message */
- pos = strchr(buffer, '@');
- if (pos == NULL) {
- err(udev, "invalid uevent '%s'\n", buffer);
- free(msg);
- return NULL;
- }
- pos[0] = '\0';
+ if ((ioctl(pfd[FD_INOTIFY].fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
+ return 0;
- if (msg->action == NULL) {
- info(udev, "no ACTION in payload found, skip event '%s'\n", buffer);
- free(msg);
- return NULL;
+ buf = malloc(nbytes);
+ if (buf == NULL) {
+ err(udev, "error getting buffer for inotify\n");
+ return -1;
}
- if (strcmp(msg->action, buffer) != 0) {
- err(udev, "ACTION in payload does not match uevent, skip event '%s'\n", buffer);
- free(msg);
- return NULL;
- }
+ nbytes = read(pfd[FD_INOTIFY].fd, buf, nbytes);
- return msg;
-}
+ for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
+ struct udev_device *dev;
-static void asmlinkage sig_handler(int signum)
-{
- 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;
- }
+ ev = (struct inotify_event *)(buf + pos);
+ if (ev->len) {
+ dbg(udev, "inotify event: %x for %s\n", ev->mask, ev->name);
+ reload_config = true;
+ continue;
+ }
- /* write to pipe, which will wakeup select() in our mainloop */
- write(signal_pipe[WRITE_END], "", 1);
-}
+ dev = udev_watch_lookup(udev, ev->wd);
+ if (dev != NULL) {
+ dbg(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
+ if (ev->mask & IN_CLOSE_WRITE) {
+ char filename[UTIL_PATH_SIZE];
+ int fd;
+
+ info(udev, "device %s closed, synthesising 'change'\n", 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 (ev->mask & IN_IGNORED)
+ udev_watch_end(udev, dev);
-static void udev_done(int pid, int exitstatus)
-{
- /* find msg associated with pid and delete it */
- struct udevd_uevent_msg *msg;
-
- list_for_each_entry(msg, &running_list, node) {
- if (msg->pid == pid) {
- info(msg->udev, "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);
-
- /* there may be events waiting with the same devpath */
- run_exec_q = 1;
- return;
+ udev_device_unref(dev);
}
- }
-}
-
-static void reap_sigchilds(void)
-{
- pid_t pid;
- int status;
- 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);
}
+
+ free(buf);
+ return 0;
}
-static int init_uevent_netlink_sock(struct udev *udev)
+static void handle_signal(struct udev *udev, int signo)
{
- 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(udev, "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(udev, "bind failed: %s\n", strerror(errno));
- close(uevent_netlink_sock);
- uevent_netlink_sock = -1;
- return -1;
+ switch (signo) {
+ case SIGINT:
+ case SIGTERM:
+ udev_exit = true;
+ break;
+ case SIGCHLD:
+ while (1) {
+ pid_t pid;
+ int status;
+ struct udev_list_node *loop, *tmp;
+
+ pid = waitpid(-1, &status, WNOHANG);
+ if (pid <= 0)
+ break;
+
+ udev_list_node_foreach_safe(loop, tmp, &worker_list) {
+ struct worker *worker = node_to_worker(loop);
+
+ if (worker->pid != pid)
+ continue;
+
+ info(udev, "worker [%u] exit\n", pid);
+ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+ err(udev, "worker [%u] unexpectedly returned with status 0x%04x\n", pid, status);
+ 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);
+ /* drop reference from running event */
+ worker_unref(worker);
+ }
+ }
+ worker_unref(worker);
+ break;
+ }
+ }
+ break;
+ case SIGHUP:
+ reload_config = true;
+ break;
}
- return 0;
}
-static void export_initial_seqnum(struct udev *udev)
+static void startup_log(struct udev *udev)
{
- char filename[PATH_SIZE];
- int fd;
- char seqnum[32];
- ssize_t len = 0;
-
- strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
- strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
- fd = open(filename, O_RDONLY);
- if (fd >= 0) {
- len = read(fd, seqnum, sizeof(seqnum)-1);
- close(fd);
- }
- if (len <= 0) {
- strcpy(seqnum, "0\n");
- len = 3;
- }
- strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
- 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);
- close(fd);
+ 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(15);
}
+
+ if (f != NULL)
+ fclose(f);
}
int main(int argc, char *argv[])
{
struct udev *udev;
- int retval;
int fd;
- struct sigaction act;
- fd_set readfds;
+ sigset_t mask;
const char *value;
- int daemonize = 0;
+ int daemonize = false;
+ int resolve_names = 1;
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' },
+ { "resolve-names", required_argument, NULL, 'N' },
{}
};
int rc = 1;
- int maxfd;
udev = udev_new();
if (udev == NULL)
goto exit;
- logging_init("udevd");
+ udev_log_init("udevd");
udev_set_log_fn(udev, log_fn);
-
- selinux_init(udev);
- dbg(udev, "version %s\n", VERSION);
+ info(udev, "version %s\n", VERSION);
+ udev_selinux_init(udev);
while (1) {
int option;
switch (option) {
case 'd':
- daemonize = 1;
+ daemonize = true;
break;
case 't':
- debug_trace = 1;
+ debug_trace = true;
break;
case 'D':
- debug = 1;
+ debug = true;
if (udev_get_log_priority(udev) < LOG_INFO)
udev_set_log_priority(udev, LOG_INFO);
break;
+ case 'N':
+ if (strcmp (optarg, "early") == 0) {
+ resolve_names = 1;
+ } else if (strcmp (optarg, "late") == 0) {
+ resolve_names = 0;
+ } else if (strcmp (optarg, "never") == 0) {
+ resolve_names = -1;
+ } else {
+ fprintf(stderr, "resolve-names must be early, late or never\n");
+ err(udev, "resolve-names must be early, late or never\n");
+ goto exit;
+ }
+ break;
case 'h':
- printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] [--version]\n");
+ printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
+ "[--resolve-names=early|late|never] [--version]\n");
goto exit;
case 'V':
printf("%s\n", VERSION);
fprintf(stderr, "cannot open /dev/null\n");
err(udev, "cannot open /dev/null\n");
}
- if (fd > STDIN_FILENO)
- dup2(fd, STDIN_FILENO);
if (write(STDOUT_FILENO, 0, 0) < 0)
dup2(fd, STDOUT_FILENO);
if (write(STDERR_FILENO, 0, 0) < 0)
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);
- if (init_uevent_netlink_sock(udev) < 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;
}
-
- retval = pipe(signal_pipe);
- if (retval < 0) {
- err(udev, "error getting pipes: %s\n", strerror(errno));
+ 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;
}
- retval = fcntl(signal_pipe[READ_END], F_GETFL, 0);
- if (retval < 0) {
- err(udev, "error fcntl on read pipe: %s\n", strerror(errno));
- 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];
+ struct stat statbuf;
+
+ inotify_add_watch(pfd[FD_INOTIFY].fd, LIBEXECDIR "/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);
+ if (stat(filename, &statbuf) != 0) {
+ util_create_path(udev, filename);
+ udev_selinux_setfscreatecon(udev, filename, S_IFDIR|0755);
+ mkdir(filename, 0755);
+ udev_selinux_resetfscreatecon(udev);
+ }
+ inotify_add_watch(pfd[FD_INOTIFY].fd, filename,
+ IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
}
- retval = fcntl(signal_pipe[READ_END], F_SETFL, retval | O_NONBLOCK);
- if (retval < 0) {
- err(udev, "error fcntl on read pipe: %s\n", strerror(errno));
+ udev_watch_restore(udev);
+
+ /* block and listen to all signals on signalfd */
+ sigfillset(&mask);
+ sigprocmask(SIG_SETMASK, &mask, &orig_sigmask);
+ 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;
}
- retval = fcntl(signal_pipe[WRITE_END], F_GETFL, 0);
- if (retval < 0) {
- err(udev, "error fcntl on write pipe: %s\n", strerror(errno));
+ /* unnamed socket from workers to the main daemon */
+ if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
+ fprintf(stderr, "error getting socketpair\n");
+ err(udev, "error getting socketpair\n");
+ rc = 6;
goto exit;
}
- retval = fcntl(signal_pipe[WRITE_END], F_SETFL, retval | O_NONBLOCK);
- if (retval < 0) {
- err(udev, "error fcntl on write pipe: %s\n", strerror(errno));
+ 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;
}
- /* parse the rules and keep them in memory */
- sysfs_init();
- udev_rules_init(udev, &rules, 1);
-
- export_initial_seqnum(udev);
+ udev_queue_export = udev_queue_export_new(udev);
+ if (udev_queue_export == NULL) {
+ err(udev, "error creating queue file\n");
+ goto exit;
+ }
if (daemonize) {
pid_t pid;
pid = fork();
switch (pid) {
case 0:
- dbg(udev, "daemonized fork running\n");
break;
case -1:
- err(udev, "fork of daemon failed: %s\n", strerror(errno));
+ 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) {
+ if (!debug && !debug_trace) {
+ dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
}
chdir("/");
umask(022);
-
- /* become session leader */
- sid = setsid();
- dbg(udev, "our session is %d\n", sid);
+ setsid();
/* OOM_DISABLE == -17 */
fd = open("/proc/self/oom_adj", O_RDWR);
- if (fd < 0)
- err(udev, "error disabling OOM: %s\n", strerror(errno));
- else {
+ if (fd < 0) {
+ err(udev, "error disabling OOM: %m\n");
+ } else {
write(fd, "-17", 3);
close(fd);
}
- fd = open("/dev/kmsg", O_WRONLY);
- if (fd > 0) {
- const char *str = "<6>udevd version " VERSION " started\n";
+ /* in trace mode run one event after the other */
+ if (debug_trace) {
+ max_childs = 1;
+ } else {
+ int memsize = mem_size_mb();
- write(fd, str, strlen(str));
- close(fd);
+ if (memsize > 0)
+ max_childs = 128 + (memsize / 8);
+ else
+ max_childs = 128;
}
- /* set signal handlers */
- memset(&act, 0x00, sizeof(struct sigaction));
- act.sa_handler = (void (*)(int)) 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 */
- inotify_fd = inotify_init();
- 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[PATH_MAX];
-
- 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 */
- strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
- 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(udev, "the kernel does not support inotify, udevd can't monitor rules file changes\n");
- else
- err(udev, "inotify_init failed: %s\n", strerror(errno));
-
- /* maximum limit of forked childs */
+ /* possibly overwrite maximum limit of executed events */
value = getenv("UDEVD_MAX_CHILDS");
if (value)
max_childs = strtoul(value, NULL, 10);
- else {
- int memsize = mem_size_mb();
- if (memsize > 0)
- max_childs = 128 + (memsize / 4);
- else
- max_childs = UDEVD_MAX_CHILDS;
- }
info(udev, "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(udev, "initialize max_childs_running to %u\n", max_childs_running);
-
- /* clear environment for forked event processes */
- clearenv();
-
- /* export log_priority , as called programs may want to follow that setting */
- sprintf(udev_log_env, "UDEV_LOG=%i", udev_get_log_priority(udev));
- putenv(udev_log_env);
- if (debug_trace)
- putenv("DEBUG=1");
-
- maxfd = udev_ctrl_get_fd(udev_ctrl);
- maxfd = UDEV_MAX(maxfd, uevent_netlink_sock);
- maxfd = UDEV_MAX(maxfd, signal_pipe[READ_END]);
- maxfd = UDEV_MAX(maxfd, inotify_fd);
+ udev_list_init(&event_list);
+ udev_list_init(&worker_list);
while (!udev_exit) {
- struct udevd_uevent_msg *msg;
int fdcount;
+ int timeout;
- FD_ZERO(&readfds);
- FD_SET(signal_pipe[READ_END], &readfds);
- FD_SET(udev_ctrl_get_fd(udev_ctrl), &readfds);
- FD_SET(uevent_netlink_sock, &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(udev, "error in select: %s\n", strerror(errno));
+ /* 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;
- }
- /* get control message */
- if (FD_ISSET(udev_ctrl_get_fd(udev_ctrl), &readfds))
- handle_ctrl_msg(udev_ctrl);
+ /* timeout - kill idle workers */
+ if (fdcount == 0)
+ worker_kill(udev, 2);
- /* get netlink message */
- if (FD_ISSET(uevent_netlink_sock, &readfds)) {
- msg = get_netlink_msg(udev);
- if (msg)
- msg_queue_insert(msg);
- }
+ /* event has finished */
+ if (pfd[FD_WORKER].revents & POLLIN)
+ worker_returned();
- /* received a signal, clear our notification pipe */
- if (FD_ISSET(signal_pipe[READ_END], &readfds)) {
- char buf[256];
+ /* get kernel uevent */
+ if (pfd[FD_NETLINK].revents & POLLIN) {
+ struct udev_device *dev;
- read(signal_pipe[READ_END], &buf, sizeof(buf));
+ dev = udev_monitor_receive_device(monitor);
+ if (dev != NULL)
+ event_queue_insert(dev);
+ else
+ udev_device_unref(dev);
}
- /* rules directory inotify watch */
- if ((inotify_fd >= 0) && FD_ISSET(inotify_fd, &readfds)) {
- int nbytes;
+ /* start new events */
+ if (!udev_list_is_empty(&event_list) && !stop_exec_queue)
+ events_start(udev);
- /* discard all possible events, we can just reload the config */
- if ((ioctl(inotify_fd, FIONREAD, &nbytes) == 0) && nbytes > 0) {
- char *buf;
+ /* get signal */
+ if (pfd[FD_SIGNAL].revents & POLLIN) {
+ struct signalfd_siginfo fdsi;
+ ssize_t size;
- reload_config = 1;
- buf = malloc(nbytes);
- if (buf == NULL) {
- err(udev, "error getting buffer for inotify, disable watching\n");
- close(inotify_fd);
- inotify_fd = -1;
- }
- read(inotify_fd, buf, nbytes);
- free(buf);
- }
+ size = read(pfd[FD_SIGNAL].fd, &fdsi, sizeof(struct signalfd_siginfo));
+ if (size == sizeof(struct signalfd_siginfo))
+ handle_signal(udev, fdsi.ssi_signo);
}
+ /* device node and rules directory inotify watch */
+ if (pfd[FD_INOTIFY].revents & POLLIN)
+ 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
+ * "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) {
- reload_config = 0;
- udev_rules_cleanup(&rules);
- udev_rules_init(udev, &rules, 1);
- }
+ struct udev_rules *rules_new;
- /* forked child has returned */
- if (sigchilds_waiting) {
- sigchilds_waiting = 0;
- reap_sigchilds();
- }
-
- if (run_exec_q) {
- run_exec_q = 0;
- if (!stop_exec_q)
- msg_queue_manager(udev);
+ worker_kill(udev, 0);
+ rules_new = udev_rules_new(udev, resolve_names);
+ if (rules_new != NULL) {
+ udev_rules_unref(rules);
+ rules = rules_new;
+ }
+ reload_config = 0;
}
}
- rc = 0;
+ udev_queue_export_cleanup(udev_queue_export);
+ rc = 0;
exit:
- udev_rules_cleanup(&rules);
- sysfs_cleanup();
- selinux_exit(udev);
-
- if (signal_pipe[READ_END] >= 0)
- close(signal_pipe[READ_END]);
- if (signal_pipe[WRITE_END] >= 0)
- close(signal_pipe[WRITE_END]);
-
+ udev_queue_export_unref(udev_queue_export);
+ udev_rules_unref(rules);
udev_ctrl_unref(udev_ctrl);
- if (inotify_fd >= 0)
- close(inotify_fd);
- if (uevent_netlink_sock >= 0)
- close(uevent_netlink_sock);
-
- logging_close();
+ 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);
+ udev_log_close();
return rc;
}
~ianmdlvl / elogind.git / blobdiff