/*
* Copyright (C) 2004-2008 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
}
}
+static void reap_sigchilds(void);
+
static int debug_trace;
static struct udev_rules *rules;
static struct udev_ctrl *udev_ctrl;
static struct udev_monitor *kernel_monitor;
-static int inotify_fd = -1;
static volatile int sigchilds_waiting;
static volatile int udev_exit;
static volatile int reload_config;
static volatile int signal_received;
+static volatile pid_t settle_pid;
static int run_exec_q;
static int stop_exec_q;
static int max_childs;
switch (pid) {
case 0:
/* child */
- udev_monitor_unref(kernel_monitor);
udev_ctrl_unref(udev_ctrl);
- if (inotify_fd >= 0)
- close(inotify_fd);
logging_close();
logging_init("udevd-event");
setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
udev_event_execute_run(event);
+ /* apply/restore inotify watch */
+ if (err == 0 && event->inotify_watch) {
+ udev_watch_begin(event->udev, event->dev);
+ udev_device_update_db(event->dev);
+ }
+
+ /* send processed event back to the kernel netlink socket */
+ udev_monitor_send_device(kernel_monitor, event->dev);
+
info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
logging_close();
if (err != 0)
static int mem_size_mb(void)
{
- FILE* f;
+ FILE *f;
char buf[4096];
long int memsize = -1;
struct udev_list_node *loop;
struct udev_list_node *tmp;
+start_over:
if (udev_list_is_empty(&event_list)) {
if (childs > 0) {
err(udev, "event list empty, but childs count is %i", childs);
event_fork(loop_event);
dbg(udev, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event->dev));
+
+ /* retry if events finished in the meantime */
+ if (sigchilds_waiting) {
+ sigchilds_waiting = 0;
+ reap_sigchilds();
+ goto start_over;
+ }
}
}
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");
+ }
udev_ctrl_msg_unref(ctrl_msg);
}
+/* read inotify messages */
+static int handle_inotify(struct udev *udev)
+{
+ int nbytes, pos;
+ char *buf;
+ struct inotify_event *ev;
+
+ if ((ioctl(inotify_fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
+ return 0;
+
+ buf = malloc(nbytes);
+ if (buf == NULL) {
+ err(udev, "error getting buffer for inotify, disable watching\n");
+ close(inotify_fd);
+ inotify_fd = -1;
+ return 0;
+ }
+
+ read(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_strlcpy(filename, udev_device_get_syspath(dev), sizeof(filename));
+ util_strlcat(filename, "/uevent", sizeof(filename));
+ 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 asmlinkage sig_handler(int signum)
{
switch (signum) {
}
}
+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_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
+ util_strlcat(path, "/class/mem/null", sizeof(path));
+ 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;
struct sigaction act;
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;
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);
goto exit;
}
- kernel_monitor = udev_monitor_new_from_netlink(udev);
+ kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
fprintf(stderr, "error initializing netlink socket\n");
err(udev, "error initializing netlink socket\n");
}
udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
- rules = udev_rules_new(udev, 1);
+ rules = udev_rules_new(udev, resolve_names);
if (rules == NULL) {
err(udev, "error reading rules\n");
goto exit;
close(fd);
}
- fd = open("/dev/kmsg", O_WRONLY);
- if (fd > 0) {
- const char *ver_str = "<6>udev: starting version " VERSION "\n";
- char path[UTIL_PATH_SIZE];
- struct stat statbuf;
-
- write(fd, ver_str, strlen(ver_str));
- util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
- util_strlcat(path, "/class/mem/null", sizeof(path));
- if (lstat(path, &statbuf) == 0) {
- if (S_ISDIR(statbuf.st_mode)) {
- const char *depr_str =
- "<6>udev: deprecated sysfs layout; update the kernel or "
- "disable CONFIG_SYSFS_DEPRECATED; some udev features will "
- "not work correctly\n";
-
- write(fd, depr_str, strlen(depr_str));
- }
- }
- close(fd);
- }
+ startup_log(udev);
/* 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();
+ udev_watch_init(udev);
if (inotify_fd >= 0) {
if (udev_get_rules_path(udev) != NULL) {
inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
inotify_add_watch(inotify_fd, filename,
IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
}
- } else if (errno == ENOSYS)
- info(udev, "unable to use inotify, udevd will not monitor rule files changes\n");
- else
- err(udev, "inotify_init failed: %m\n");
+
+ udev_watch_restore(udev);
+ }
/* in trace mode run one event after the other */
if (debug_trace) {
}
/* rules directory inotify watch */
- if (inotify_poll && (inotify_poll->revents & POLLIN)) {
- int nbytes;
-
- /* discard all possible events, we can just reload the config */
- if ((ioctl(inotify_fd, FIONREAD, &nbytes) == 0) && nbytes > 0) {
- char *buf;
-
- 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);
- }
- }
+ if (inotify_poll && (inotify_poll->revents & POLLIN))
+ handle_inotify(udev);
handle_signals:
signal_received = 0;
struct udev_rules *rules_new;
reload_config = 0;
- rules_new = udev_rules_new(udev, 1);
+ rules_new = udev_rules_new(udev, resolve_names);
if (rules_new != NULL) {
udev_rules_unref(rules);
rules = rules_new;
if (!stop_exec_q)
event_queue_manager(udev);
}
+
+ if (settle_pid > 0) {
+ kill(settle_pid, SIGUSR1);
+ settle_pid = 0;
+ }
}
cleanup_queue_dir(udev);
rc = 0;
~ianmdlvl / elogind.git / blobdiff