mirror of
https://github.com/systemd/systemd.git
synced 2024-12-23 21:35:11 +03:00
1073 lines
26 KiB
C
1073 lines
26 KiB
C
/*
|
|
* 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, 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <stddef.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
#include <fcntl.h>
|
|
#include <time.h>
|
|
#include <getopt.h>
|
|
#include <dirent.h>
|
|
#include <sys/prctl.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/signalfd.h>
|
|
#include <sys/select.h>
|
|
#include <sys/poll.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/inotify.h>
|
|
|
|
#include "udev.h"
|
|
|
|
#define UDEVD_PRIORITY -4
|
|
#define UDEV_PRIORITY -2
|
|
|
|
static int debug;
|
|
|
|
static void log_fn(struct udev *udev, int priority,
|
|
const char *file, int line, const char *fn,
|
|
const char *format, va_list args)
|
|
{
|
|
if (debug) {
|
|
fprintf(stderr, "[%d] %s: ", (int) getpid(), fn);
|
|
vfprintf(stderr, format, args);
|
|
} else {
|
|
vsyslog(priority, format, args);
|
|
}
|
|
}
|
|
|
|
static int debug_trace;
|
|
static struct udev_rules *rules;
|
|
static 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 },
|
|
};
|
|
|
|
enum event_state {
|
|
EVENT_UNDEF,
|
|
EVENT_QUEUED,
|
|
EVENT_RUNNING,
|
|
};
|
|
|
|
struct event {
|
|
struct udev_list_node node;
|
|
struct udev *udev;
|
|
struct udev_device *dev;
|
|
enum event_state state;
|
|
int exitcode;
|
|
unsigned long long int delaying_seqnum;
|
|
unsigned long long int seqnum;
|
|
const char *devpath;
|
|
size_t devpath_len;
|
|
const char *devpath_old;
|
|
};
|
|
|
|
static struct event *node_to_event(struct udev_list_node *node)
|
|
{
|
|
char *event;
|
|
|
|
event = (char *)node;
|
|
event -= offsetof(struct event, node);
|
|
return (struct event *)event;
|
|
}
|
|
|
|
enum worker_state {
|
|
WORKER_UNDEF,
|
|
WORKER_RUNNING,
|
|
WORKER_IDLE,
|
|
WORKER_KILLED,
|
|
};
|
|
|
|
struct worker {
|
|
struct udev_list_node node;
|
|
pid_t pid;
|
|
struct udev_monitor *monitor;
|
|
enum worker_state state;
|
|
struct event *event;
|
|
};
|
|
|
|
/* passed from worker to main process */
|
|
struct worker_message {
|
|
pid_t pid;
|
|
int exitcode;
|
|
};
|
|
|
|
static struct worker *node_to_worker(struct udev_list_node *node)
|
|
{
|
|
char *worker;
|
|
|
|
worker = (char *)node;
|
|
worker -= offsetof(struct worker, node);
|
|
return (struct worker *)worker;
|
|
}
|
|
|
|
static void event_queue_delete(struct event *event)
|
|
{
|
|
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
|
|
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);
|
|
}
|
|
|
|
static void event_sig_handler(int signum)
|
|
{
|
|
switch (signum) {
|
|
case SIGALRM:
|
|
_exit(1);
|
|
break;
|
|
case SIGTERM:
|
|
worker_exit = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void worker_unref(struct worker *worker)
|
|
{
|
|
udev_monitor_unref(worker->monitor);
|
|
free(worker);
|
|
}
|
|
|
|
static void worker_new(struct event *event)
|
|
{
|
|
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);
|
|
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)
|
|
return;
|
|
|
|
pid = fork();
|
|
switch (pid) {
|
|
case 0: {
|
|
sigset_t mask;
|
|
struct udev_device *dev;
|
|
|
|
udev_queue_export_unref(udev_queue_export);
|
|
udev_monitor_unref(monitor);
|
|
udev_ctrl_unref(udev_ctrl);
|
|
close(pfd[FD_SIGNAL].fd);
|
|
close(worker_watch[READ_END]);
|
|
logging_close();
|
|
logging_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);
|
|
|
|
/* request TERM signal if parent exits */
|
|
prctl(PR_SET_PDEATHSIG, SIGTERM);
|
|
|
|
/* initial device */
|
|
dev = event->dev;
|
|
|
|
while (!worker_exit) {
|
|
struct udev_event *udev_event;
|
|
struct worker_message msg;
|
|
int err;
|
|
|
|
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))
|
|
udev_event_execute_run(udev_event);
|
|
|
|
/* reset alarm */
|
|
alarm(0);
|
|
|
|
/* apply/restore inotify watch */
|
|
if (err == 0 && udev_event->inotify_watch) {
|
|
udev_watch_begin(udev_event->udev, dev);
|
|
udev_device_update_db(dev);
|
|
}
|
|
|
|
/* send processed event back to 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);
|
|
udev_device_unref(dev);
|
|
udev_event_unref(udev_event);
|
|
|
|
/* send back the result of the event execution */
|
|
msg.exitcode = err;
|
|
msg.pid = getpid();
|
|
send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
|
|
|
|
/* wait for more device messages from udevd */
|
|
do
|
|
dev = udev_monitor_receive_device(worker_monitor);
|
|
while (!worker_exit && dev == NULL);
|
|
}
|
|
|
|
udev_monitor_unref(worker_monitor);
|
|
logging_close();
|
|
exit(0);
|
|
}
|
|
case -1:
|
|
udev_monitor_unref(worker_monitor);
|
|
event->state = EVENT_QUEUED;
|
|
free(worker);
|
|
err(event->udev, "fork of child failed: %m\n");
|
|
break;
|
|
default:
|
|
/* close monitor, but keep address around */
|
|
udev_monitor_disconnect(worker_monitor);
|
|
worker->monitor = worker_monitor;
|
|
worker->pid = pid;
|
|
worker->state = WORKER_RUNNING;
|
|
worker->event = event;
|
|
event->state = EVENT_RUNNING;
|
|
udev_list_node_append(&worker->node, &worker_list);
|
|
childs++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void event_run(struct event *event)
|
|
{
|
|
struct udev_list_node *loop;
|
|
|
|
udev_list_node_foreach(loop, &worker_list) {
|
|
struct worker *worker = node_to_worker(loop);
|
|
ssize_t count;
|
|
|
|
if (worker->state != WORKER_IDLE)
|
|
continue;
|
|
|
|
worker->event = event;
|
|
worker->state = WORKER_RUNNING;
|
|
event->state = EVENT_RUNNING;
|
|
count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
|
|
if (count < 0) {
|
|
err(event->udev, "worker [%u] did not accept message, kill it\n", worker->pid);
|
|
event->state = EVENT_QUEUED;
|
|
worker->state = WORKER_KILLED;
|
|
kill(worker->pid, SIGKILL);
|
|
continue;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (childs >= max_childs) {
|
|
info(event->udev, "maximum number (%i) of childs reached\n", childs);
|
|
return;
|
|
}
|
|
|
|
/* start new worker and pass initial device */
|
|
worker_new(event);
|
|
}
|
|
|
|
static void event_queue_insert(struct udev_device *dev)
|
|
{
|
|
struct event *event;
|
|
|
|
event = calloc(1, sizeof(struct event));
|
|
if (event == NULL)
|
|
return;
|
|
|
|
event->udev = udev_device_get_udev(dev);
|
|
event->dev = dev;
|
|
event->seqnum = udev_device_get_seqnum(dev);
|
|
event->devpath = udev_device_get_devpath(dev);
|
|
event->devpath_len = strlen(event->devpath);
|
|
event->devpath_old = udev_device_get_devpath_old(dev);
|
|
|
|
udev_queue_export_device_queued(udev_queue_export, dev);
|
|
info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev),
|
|
udev_device_get_action(dev), udev_device_get_subsystem(dev));
|
|
|
|
event->state = EVENT_QUEUED;
|
|
udev_list_node_append(&event->node, &event_list);
|
|
|
|
/* run all events with a timeout set immediately */
|
|
if (udev_device_get_timeout(dev) > 0) {
|
|
worker_new(event);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void worker_kill(int retain)
|
|
{
|
|
struct udev_list_node *loop;
|
|
int max;
|
|
|
|
if (childs <= retain)
|
|
return;
|
|
|
|
max = childs - retain;
|
|
|
|
udev_list_node_foreach(loop, &worker_list) {
|
|
struct worker *worker = node_to_worker(loop);
|
|
|
|
if (max-- <= 0)
|
|
break;
|
|
|
|
if (worker->state == WORKER_KILLED)
|
|
continue;
|
|
|
|
worker->state = WORKER_KILLED;
|
|
kill(worker->pid, SIGTERM);
|
|
}
|
|
}
|
|
|
|
static int mem_size_mb(void)
|
|
{
|
|
FILE *f;
|
|
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)
|
|
{
|
|
struct udev_list_node *loop;
|
|
size_t common;
|
|
|
|
/* check if queue contains events we depend on */
|
|
udev_list_node_foreach(loop, &event_list) {
|
|
struct event *loop_event = node_to_event(loop);
|
|
|
|
/* we already found a later event, earlier can not block us, no need to check again */
|
|
if (loop_event->seqnum < event->delaying_seqnum)
|
|
continue;
|
|
|
|
/* event we checked earlier still exists, no need to check again */
|
|
if (loop_event->seqnum == event->delaying_seqnum)
|
|
return 2;
|
|
|
|
/* found ourself, no later event can block us */
|
|
if (loop_event->seqnum >= event->seqnum)
|
|
break;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* compare devpath */
|
|
common = MIN(loop_event->devpath_len, event->devpath_len);
|
|
|
|
/* one devpath is contained in the other? */
|
|
if (memcmp(loop_event->devpath, event->devpath, common) != 0)
|
|
continue;
|
|
|
|
/* identical device event found */
|
|
if (loop_event->devpath_len == event->devpath_len) {
|
|
event->delaying_seqnum = loop_event->seqnum;
|
|
return 4;
|
|
}
|
|
|
|
/* parent device event found */
|
|
if (event->devpath[common] == '/') {
|
|
event->delaying_seqnum = loop_event->seqnum;
|
|
return 5;
|
|
}
|
|
|
|
/* child device event found */
|
|
if (loop_event->devpath[common] == '/') {
|
|
event->delaying_seqnum = loop_event->seqnum;
|
|
return 6;
|
|
}
|
|
|
|
/* no matching device */
|
|
continue;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void events_start(struct udev *udev)
|
|
{
|
|
struct udev_list_node *loop;
|
|
|
|
udev_list_node_foreach(loop, &event_list) {
|
|
struct event *event = node_to_event(loop);
|
|
|
|
if (event->state != EVENT_QUEUED)
|
|
continue;
|
|
|
|
/* do not start event if parent or child event is still running */
|
|
if (devpath_busy(event) != 0) {
|
|
dbg(udev, "delay seq %llu (%s)\n", event->seqnum, event->devpath);
|
|
continue;
|
|
}
|
|
|
|
event_run(event);
|
|
}
|
|
}
|
|
|
|
static void worker_returned(void)
|
|
{
|
|
while (1) {
|
|
struct worker_message msg;
|
|
ssize_t size;
|
|
struct udev_list_node *loop;
|
|
|
|
size = recv(pfd[FD_WORKER].fd, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
|
|
if (size != sizeof(struct worker_message))
|
|
break;
|
|
|
|
/* lookup worker who sent the signal */
|
|
udev_list_node_foreach(loop, &worker_list) {
|
|
struct worker *worker = node_to_worker(loop);
|
|
|
|
if (worker->pid != msg.pid)
|
|
continue;
|
|
|
|
/* worker returned */
|
|
worker->event->exitcode = msg.exitcode;
|
|
event_queue_delete(worker->event);
|
|
worker->event = NULL;
|
|
worker->state = WORKER_IDLE;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* receive the udevd message from userspace */
|
|
static void handle_ctrl_msg(struct udev_ctrl *uctrl)
|
|
{
|
|
struct udev *udev = udev_ctrl_get_udev(uctrl);
|
|
struct udev_ctrl_msg *ctrl_msg;
|
|
const char *str;
|
|
int i;
|
|
|
|
ctrl_msg = udev_ctrl_receive_msg(uctrl);
|
|
if (ctrl_msg == NULL)
|
|
return;
|
|
|
|
i = udev_ctrl_get_set_log_level(ctrl_msg);
|
|
if (i >= 0) {
|
|
info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
|
|
udev_set_log_priority(udev, i);
|
|
worker_kill(0);
|
|
}
|
|
|
|
if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
|
|
info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
|
|
stop_exec_queue = 1;
|
|
}
|
|
|
|
if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
|
|
info(udev, "udevd message (START_EXEC_QUEUE) received\n");
|
|
stop_exec_queue = 0;
|
|
}
|
|
|
|
if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
|
|
info(udev, "udevd message (RELOAD_RULES) received\n");
|
|
reload_config = 1;
|
|
}
|
|
|
|
str = udev_ctrl_get_set_env(ctrl_msg);
|
|
if (str != NULL) {
|
|
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 {
|
|
err(udev, "wrong key format '%s'\n", key);
|
|
}
|
|
free(key);
|
|
}
|
|
worker_kill(0);
|
|
}
|
|
|
|
i = udev_ctrl_get_set_max_childs(ctrl_msg);
|
|
if (i >= 0) {
|
|
info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
|
|
max_childs = i;
|
|
}
|
|
|
|
settle_pid = udev_ctrl_get_settle(ctrl_msg);
|
|
if (settle_pid > 0) {
|
|
info(udev, "udevd message (SETTLE) received\n");
|
|
kill(settle_pid, SIGUSR1);
|
|
settle_pid = 0;
|
|
}
|
|
udev_ctrl_msg_unref(ctrl_msg);
|
|
}
|
|
|
|
/* read inotify messages */
|
|
static int handle_inotify(struct udev *udev)
|
|
{
|
|
ssize_t nbytes, pos;
|
|
char *buf;
|
|
struct inotify_event *ev;
|
|
|
|
if ((ioctl(pfd[FD_INOTIFY].fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
|
|
return 0;
|
|
|
|
buf = malloc(nbytes);
|
|
if (buf == NULL) {
|
|
err(udev, "error getting buffer for inotify\n");
|
|
return -1;
|
|
}
|
|
|
|
nbytes = read(pfd[FD_INOTIFY].fd, 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;
|
|
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));
|
|
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);
|
|
|
|
udev_device_unref(dev);
|
|
}
|
|
|
|
}
|
|
|
|
free(buf);
|
|
return 0;
|
|
}
|
|
|
|
static void handle_signal(struct udev *udev, int signo)
|
|
{
|
|
switch (signo) {
|
|
case SIGINT:
|
|
case SIGTERM:
|
|
udev_exit = 1;
|
|
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;
|
|
|
|
/* 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);
|
|
}
|
|
|
|
udev_list_node_remove(&worker->node);
|
|
worker_unref(worker);
|
|
childs--;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case SIGHUP:
|
|
reload_config = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void startup_log(struct udev *udev)
|
|
{
|
|
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);
|
|
}
|
|
|
|
if (f != NULL)
|
|
fclose(f);
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
struct udev *udev;
|
|
int fd;
|
|
sigset_t mask;
|
|
const char *value;
|
|
int daemonize = 0;
|
|
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' },
|
|
{ "help", no_argument, NULL, 'h' },
|
|
{ "version", no_argument, NULL, 'V' },
|
|
{ "resolve-names", required_argument, NULL, 'N' },
|
|
{}
|
|
};
|
|
int rc = 1;
|
|
|
|
udev = udev_new();
|
|
if (udev == NULL)
|
|
goto exit;
|
|
|
|
logging_init("udevd");
|
|
udev_set_log_fn(udev, log_fn);
|
|
info(udev, "version %s\n", VERSION);
|
|
udev_selinux_init(udev);
|
|
|
|
while (1) {
|
|
int option;
|
|
|
|
option = getopt_long(argc, argv, "dDthV", options, NULL);
|
|
if (option == -1)
|
|
break;
|
|
|
|
switch (option) {
|
|
case 'd':
|
|
daemonize = 1;
|
|
break;
|
|
case 't':
|
|
debug_trace = 1;
|
|
break;
|
|
case 'D':
|
|
debug = 1;
|
|
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] "
|
|
"[--resolve-names=early|late|never] [--version]\n");
|
|
goto exit;
|
|
case 'V':
|
|
printf("%s\n", VERSION);
|
|
goto exit;
|
|
default:
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
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");
|
|
}
|
|
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;
|
|
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);
|
|
|
|
monitor = udev_monitor_new_from_netlink(udev, "kernel");
|
|
if (monitor == NULL || udev_monitor_enable_receiving(monitor) < 0) {
|
|
fprintf(stderr, "error initializing netlink socket\n");
|
|
err(udev, "error initializing netlink socket\n");
|
|
rc = 3;
|
|
goto exit;
|
|
}
|
|
udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
|
|
pfd[FD_NETLINK].fd = udev_monitor_get_fd(monitor);
|
|
|
|
pfd[FD_INOTIFY].fd = udev_watch_init(udev);
|
|
if (pfd[FD_INOTIFY].fd < 0) {
|
|
fprintf(stderr, "error initializing inotify\n");
|
|
err(udev, "error initializing inotify\n");
|
|
rc = 4;
|
|
goto exit;
|
|
}
|
|
|
|
if (udev_get_rules_path(udev) != NULL) {
|
|
inotify_add_watch(pfd[FD_INOTIFY].fd, udev_get_rules_path(udev),
|
|
IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
|
|
} else {
|
|
char filename[UTIL_PATH_SIZE];
|
|
|
|
inotify_add_watch(pfd[FD_INOTIFY].fd, UDEV_PREFIX "/lib/udev/rules.d",
|
|
IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
|
|
inotify_add_watch(pfd[FD_INOTIFY].fd, SYSCONFDIR "/udev/rules.d",
|
|
IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
|
|
|
|
/* watch dynamic rules directory */
|
|
util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
|
|
inotify_add_watch(pfd[FD_INOTIFY].fd, filename,
|
|
IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
|
|
}
|
|
udev_watch_restore(udev);
|
|
|
|
/* block and listen to all signals on signalfd */
|
|
sigfillset(&mask);
|
|
sigprocmask(SIG_SETMASK, &mask, NULL);
|
|
pfd[FD_SIGNAL].fd = signalfd(-1, &mask, 0);
|
|
if (pfd[FD_SIGNAL].fd < 0) {
|
|
fprintf(stderr, "error getting signalfd\n");
|
|
err(udev, "error getting signalfd\n");
|
|
rc = 5;
|
|
goto exit;
|
|
}
|
|
|
|
/* unnamed socket from workers to the main daemon */
|
|
if (socketpair(AF_LOCAL, SOCK_DGRAM, 0, worker_watch) < 0) {
|
|
fprintf(stderr, "error getting socketpair\n");
|
|
err(udev, "error getting socketpair\n");
|
|
rc = 6;
|
|
goto exit;
|
|
}
|
|
pfd[FD_WORKER].fd = worker_watch[READ_END];
|
|
util_set_fd_cloexec(worker_watch[WRITE_END]);
|
|
|
|
rules = udev_rules_new(udev, resolve_names);
|
|
if (rules == NULL) {
|
|
err(udev, "error reading rules\n");
|
|
goto exit;
|
|
}
|
|
|
|
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:
|
|
break;
|
|
case -1:
|
|
err(udev, "fork of daemon failed: %m\n");
|
|
rc = 4;
|
|
goto exit;
|
|
default:
|
|
rc = 0;
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
startup_log(udev);
|
|
|
|
/* 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();
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/* in trace mode run one event after the other */
|
|
if (debug_trace) {
|
|
max_childs = 1;
|
|
} else {
|
|
int memsize = mem_size_mb();
|
|
|
|
if (memsize > 0)
|
|
max_childs = 128 + (memsize / 8);
|
|
else
|
|
max_childs = 128;
|
|
}
|
|
|
|
/* possibly overwrite maximum limit of executed events */
|
|
value = getenv("UDEVD_MAX_CHILDS");
|
|
if (value)
|
|
max_childs = strtoul(value, NULL, 10);
|
|
info(udev, "initialize max_childs to %u\n", max_childs);
|
|
|
|
udev_list_init(&event_list);
|
|
udev_list_init(&worker_list);
|
|
|
|
while (!udev_exit) {
|
|
int fdcount;
|
|
int timeout;
|
|
|
|
/* 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;
|
|
|
|
/* timeout - kill idle workers */
|
|
if (fdcount == 0)
|
|
worker_kill(2);
|
|
|
|
/* event has finished */
|
|
if (pfd[FD_WORKER].revents & POLLIN)
|
|
worker_returned();
|
|
|
|
/* get kernel uevent */
|
|
if (pfd[FD_NETLINK].revents & POLLIN) {
|
|
struct udev_device *dev;
|
|
|
|
dev = udev_monitor_receive_device(monitor);
|
|
if (dev != NULL)
|
|
event_queue_insert(dev);
|
|
else
|
|
udev_device_unref(dev);
|
|
}
|
|
|
|
/* start new events */
|
|
if (!udev_list_is_empty(&event_list) && !stop_exec_queue)
|
|
events_start(udev);
|
|
|
|
/* get signal */
|
|
if (pfd[FD_SIGNAL].revents & POLLIN) {
|
|
struct signalfd_siginfo fdsi;
|
|
ssize_t size;
|
|
|
|
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) {
|
|
struct udev_rules *rules_new;
|
|
|
|
worker_kill(0);
|
|
rules_new = udev_rules_new(udev, resolve_names);
|
|
if (rules_new != NULL) {
|
|
udev_rules_unref(rules);
|
|
rules = rules_new;
|
|
}
|
|
reload_config = 0;
|
|
}
|
|
}
|
|
|
|
udev_queue_export_cleanup(udev_queue_export);
|
|
rc = 0;
|
|
exit:
|
|
udev_queue_export_unref(udev_queue_export);
|
|
udev_rules_unref(rules);
|
|
udev_ctrl_unref(udev_ctrl);
|
|
if (pfd[FD_SIGNAL].fd >= 0)
|
|
close(pfd[FD_SIGNAL].fd);
|
|
if (worker_watch[READ_END] >= 0)
|
|
close(worker_watch[READ_END]);
|
|
if (worker_watch[WRITE_END] >= 0)
|
|
close(worker_watch[WRITE_END]);
|
|
udev_monitor_unref(monitor);
|
|
udev_selinux_exit(udev);
|
|
udev_unref(udev);
|
|
logging_close();
|
|
return rc;
|
|
}
|