| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * Copyright © 2004 Chris Friesen <chris_friesen@sympatico.ca> |
| * Copyright © 2009 Canonical Ltd. |
| * Copyright © 2009 Scott James Remnant <scott@netsplit.com> |
| */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <getopt.h> |
| #include <stdbool.h> |
| #include <stddef.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/epoll.h> |
| #include <sys/file.h> |
| #include <sys/inotify.h> |
| #include <sys/ioctl.h> |
| #include <sys/mount.h> |
| #include <sys/prctl.h> |
| #include <sys/signalfd.h> |
| #include <sys/stat.h> |
| #include <sys/time.h> |
| #include <sys/wait.h> |
| #include <unistd.h> |
| |
| #include "sd-daemon.h" |
| #include "sd-event.h" |
| |
| #include "alloc-util.h" |
| #include "blockdev-util.h" |
| #include "cgroup-setup.h" |
| #include "cgroup-util.h" |
| #include "cpu-set-util.h" |
| #include "daemon-util.h" |
| #include "dev-setup.h" |
| #include "device-monitor-private.h" |
| #include "device-private.h" |
| #include "device-util.h" |
| #include "errno-list.h" |
| #include "event-util.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "format-util.h" |
| #include "fs-util.h" |
| #include "hashmap.h" |
| #include "inotify-util.h" |
| #include "io-util.h" |
| #include "limits-util.h" |
| #include "list.h" |
| #include "main-func.h" |
| #include "mkdir.h" |
| #include "netlink-util.h" |
| #include "parse-util.h" |
| #include "path-util.h" |
| #include "pretty-print.h" |
| #include "proc-cmdline.h" |
| #include "process-util.h" |
| #include "selinux-util.h" |
| #include "signal-util.h" |
| #include "socket-util.h" |
| #include "string-util.h" |
| #include "strv.h" |
| #include "strxcpyx.h" |
| #include "syslog-util.h" |
| #include "udevd.h" |
| #include "udev-builtin.h" |
| #include "udev-ctrl.h" |
| #include "udev-event.h" |
| #include "udev-node.h" |
| #include "udev-util.h" |
| #include "udev-watch.h" |
| #include "user-util.h" |
| #include "version.h" |
| |
| #define WORKER_NUM_MAX 2048U |
| #define EVENT_RETRY_INTERVAL_USEC (200 * USEC_PER_MSEC) |
| #define EVENT_RETRY_TIMEOUT_USEC (3 * USEC_PER_MINUTE) |
| |
| static bool arg_debug = false; |
| static int arg_daemonize = false; |
| static ResolveNameTiming arg_resolve_name_timing = RESOLVE_NAME_EARLY; |
| static unsigned arg_children_max = 0; |
| static usec_t arg_exec_delay_usec = 0; |
| static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC; |
| static int arg_timeout_signal = SIGKILL; |
| static bool arg_blockdev_read_only = false; |
| |
| typedef struct Event Event; |
| typedef struct Worker Worker; |
| |
| typedef struct Manager { |
| sd_event *event; |
| Hashmap *workers; |
| LIST_HEAD(Event, events); |
| char *cgroup; |
| pid_t pid; /* the process that originally allocated the manager object */ |
| int log_level; |
| |
| UdevRules *rules; |
| Hashmap *properties; |
| |
| sd_netlink *rtnl; |
| |
| sd_device_monitor *monitor; |
| UdevCtrl *ctrl; |
| int worker_watch[2]; |
| |
| /* used by udev-watch */ |
| int inotify_fd; |
| sd_event_source *inotify_event; |
| |
| sd_event_source *kill_workers_event; |
| |
| usec_t last_usec; |
| |
| bool udev_node_needs_cleanup; |
| bool stop_exec_queue; |
| bool exit; |
| } Manager; |
| |
| typedef enum EventState { |
| EVENT_UNDEF, |
| EVENT_QUEUED, |
| EVENT_RUNNING, |
| } EventState; |
| |
| typedef struct Event { |
| Manager *manager; |
| Worker *worker; |
| EventState state; |
| |
| sd_device *dev; |
| |
| sd_device_action_t action; |
| uint64_t seqnum; |
| uint64_t blocker_seqnum; |
| const char *id; |
| const char *devpath; |
| const char *devpath_old; |
| const char *devnode; |
| |
| /* Used when the device is locked by another program. */ |
| usec_t retry_again_next_usec; |
| usec_t retry_again_timeout_usec; |
| sd_event_source *retry_event_source; |
| |
| sd_event_source *timeout_warning_event; |
| sd_event_source *timeout_event; |
| |
| LIST_FIELDS(Event, event); |
| } Event; |
| |
| typedef enum WorkerState { |
| WORKER_UNDEF, |
| WORKER_RUNNING, |
| WORKER_IDLE, |
| WORKER_KILLED, |
| WORKER_KILLING, |
| } WorkerState; |
| |
| typedef struct Worker { |
| Manager *manager; |
| pid_t pid; |
| sd_event_source *child_event_source; |
| sd_device_monitor *monitor; |
| WorkerState state; |
| Event *event; |
| } Worker; |
| |
| /* passed from worker to main process */ |
| typedef enum EventResult { |
| EVENT_RESULT_NERRNO_MIN = -ERRNO_MAX, |
| EVENT_RESULT_NERRNO_MAX = -1, |
| EVENT_RESULT_SUCCESS = 0, |
| EVENT_RESULT_EXIT_STATUS_BASE = 0, |
| EVENT_RESULT_EXIT_STATUS_MAX = 255, |
| EVENT_RESULT_TRY_AGAIN = 256, /* when the block device is locked by another process. */ |
| EVENT_RESULT_SIGNAL_BASE = 257, |
| EVENT_RESULT_SIGNAL_MAX = EVENT_RESULT_SIGNAL_BASE + _NSIG, |
| _EVENT_RESULT_MAX, |
| _EVENT_RESULT_INVALID = -EINVAL, |
| } EventResult; |
| |
| static Event *event_free(Event *event) { |
| if (!event) |
| return NULL; |
| |
| assert(event->manager); |
| |
| LIST_REMOVE(event, event->manager->events, event); |
| sd_device_unref(event->dev); |
| |
| /* Do not use sd_event_source_disable_unref() here, as this is called by both workers and the |
| * main process. */ |
| sd_event_source_unref(event->retry_event_source); |
| sd_event_source_unref(event->timeout_warning_event); |
| sd_event_source_unref(event->timeout_event); |
| |
| if (event->worker) |
| event->worker->event = NULL; |
| |
| return mfree(event); |
| } |
| |
| static void event_queue_cleanup(Manager *manager, EventState match_state) { |
| LIST_FOREACH(event, event, manager->events) { |
| if (match_state != EVENT_UNDEF && match_state != event->state) |
| continue; |
| |
| event_free(event); |
| } |
| } |
| |
| static Worker *worker_free(Worker *worker) { |
| if (!worker) |
| return NULL; |
| |
| if (worker->manager) |
| hashmap_remove(worker->manager->workers, PID_TO_PTR(worker->pid)); |
| |
| sd_event_source_unref(worker->child_event_source); |
| sd_device_monitor_unref(worker->monitor); |
| event_free(worker->event); |
| |
| return mfree(worker); |
| } |
| |
| DEFINE_TRIVIAL_CLEANUP_FUNC(Worker*, worker_free); |
| DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(worker_hash_op, void, trivial_hash_func, trivial_compare_func, Worker, worker_free); |
| |
| static void manager_clear_for_worker(Manager *manager) { |
| assert(manager); |
| |
| /* Do not use sd_event_source_disable_unref() here, as this is called by both workers and the |
| * main process. */ |
| manager->inotify_event = sd_event_source_unref(manager->inotify_event); |
| manager->kill_workers_event = sd_event_source_unref(manager->kill_workers_event); |
| |
| manager->event = sd_event_unref(manager->event); |
| |
| manager->workers = hashmap_free(manager->workers); |
| event_queue_cleanup(manager, EVENT_UNDEF); |
| |
| manager->monitor = sd_device_monitor_unref(manager->monitor); |
| manager->ctrl = udev_ctrl_unref(manager->ctrl); |
| |
| manager->worker_watch[READ_END] = safe_close(manager->worker_watch[READ_END]); |
| } |
| |
| static Manager* manager_free(Manager *manager) { |
| if (!manager) |
| return NULL; |
| |
| udev_builtin_exit(); |
| |
| manager_clear_for_worker(manager); |
| |
| sd_netlink_unref(manager->rtnl); |
| |
| hashmap_free_free_free(manager->properties); |
| udev_rules_free(manager->rules); |
| |
| safe_close(manager->inotify_fd); |
| safe_close_pair(manager->worker_watch); |
| |
| free(manager->cgroup); |
| return mfree(manager); |
| } |
| |
| DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free); |
| |
| static int on_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata); |
| |
| static int worker_new(Worker **ret, Manager *manager, sd_device_monitor *worker_monitor, pid_t pid) { |
| _cleanup_(worker_freep) Worker *worker = NULL; |
| int r; |
| |
| assert(ret); |
| assert(manager); |
| assert(worker_monitor); |
| assert(pid > 1); |
| |
| /* close monitor, but keep address around */ |
| device_monitor_disconnect(worker_monitor); |
| |
| worker = new(Worker, 1); |
| if (!worker) |
| return -ENOMEM; |
| |
| *worker = (Worker) { |
| .monitor = sd_device_monitor_ref(worker_monitor), |
| .pid = pid, |
| }; |
| |
| r = sd_event_add_child(manager->event, &worker->child_event_source, pid, WEXITED, on_sigchld, worker); |
| if (r < 0) |
| return r; |
| |
| r = hashmap_ensure_put(&manager->workers, &worker_hash_op, PID_TO_PTR(pid), worker); |
| if (r < 0) |
| return r; |
| |
| worker->manager = manager; |
| |
| *ret = TAKE_PTR(worker); |
| return 0; |
| } |
| |
| static void manager_kill_workers(Manager *manager, bool force) { |
| Worker *worker; |
| |
| assert(manager); |
| |
| HASHMAP_FOREACH(worker, manager->workers) { |
| if (worker->state == WORKER_KILLED) |
| continue; |
| |
| if (worker->state == WORKER_RUNNING && !force) { |
| worker->state = WORKER_KILLING; |
| continue; |
| } |
| |
| worker->state = WORKER_KILLED; |
| (void) kill(worker->pid, SIGTERM); |
| } |
| } |
| |
| static void manager_exit(Manager *manager) { |
| assert(manager); |
| |
| manager->exit = true; |
| |
| (void) sd_notify(/* unset= */ false, NOTIFY_STOPPING); |
| |
| /* close sources of new events and discard buffered events */ |
| manager->ctrl = udev_ctrl_unref(manager->ctrl); |
| |
| manager->inotify_event = sd_event_source_disable_unref(manager->inotify_event); |
| manager->inotify_fd = safe_close(manager->inotify_fd); |
| |
| manager->monitor = sd_device_monitor_unref(manager->monitor); |
| |
| /* discard queued events and kill workers */ |
| event_queue_cleanup(manager, EVENT_QUEUED); |
| manager_kill_workers(manager, true); |
| } |
| |
| static void notify_ready(void) { |
| int r; |
| |
| r = sd_notifyf(/* unset= */ false, |
| "READY=1\n" |
| "STATUS=Processing with %u children at max", arg_children_max); |
| if (r < 0) |
| log_warning_errno(r, "Failed to send readiness notification, ignoring: %m"); |
| } |
| |
| /* reload requested, HUP signal received, rules changed, builtin changed */ |
| static void manager_reload(Manager *manager, bool force) { |
| _cleanup_(udev_rules_freep) UdevRules *rules = NULL; |
| usec_t now_usec; |
| int r; |
| |
| assert(manager); |
| |
| assert_se(sd_event_now(manager->event, CLOCK_MONOTONIC, &now_usec) >= 0); |
| if (!force && now_usec < usec_add(manager->last_usec, 3 * USEC_PER_SEC)) |
| /* check for changed config, every 3 seconds at most */ |
| return; |
| manager->last_usec = now_usec; |
| |
| /* Reload SELinux label database, to make the child inherit the up-to-date database. */ |
| mac_selinux_maybe_reload(); |
| |
| /* Nothing changed. It is not necessary to reload. */ |
| if (!udev_rules_should_reload(manager->rules) && !udev_builtin_should_reload()) { |
| |
| if (!force) |
| return; |
| |
| /* If we eat this up, then tell our service manager to just continue */ |
| (void) sd_notifyf(/* unset= */ false, |
| "RELOADING=1\n" |
| "STATUS=Skipping configuration reloading, nothing changed.\n" |
| "MONOTONIC_USEC=" USEC_FMT, now(CLOCK_MONOTONIC)); |
| } else { |
| (void) sd_notifyf(/* unset= */ false, |
| "RELOADING=1\n" |
| "STATUS=Flushing configuration...\n" |
| "MONOTONIC_USEC=" USEC_FMT, now(CLOCK_MONOTONIC)); |
| |
| manager_kill_workers(manager, false); |
| |
| udev_builtin_exit(); |
| udev_builtin_init(); |
| |
| r = udev_rules_load(&rules, arg_resolve_name_timing); |
| if (r < 0) |
| log_warning_errno(r, "Failed to read udev rules, using the previously loaded rules, ignoring: %m"); |
| else |
| udev_rules_free_and_replace(manager->rules, rules); |
| } |
| |
| notify_ready(); |
| } |
| |
| static int on_kill_workers_event(sd_event_source *s, uint64_t usec, void *userdata) { |
| Manager *manager = ASSERT_PTR(userdata); |
| |
| log_debug("Cleanup idle workers"); |
| manager_kill_workers(manager, false); |
| |
| return 1; |
| } |
| |
| static void device_broadcast(sd_device_monitor *monitor, sd_device *dev, EventResult result) { |
| int r; |
| |
| assert(dev); |
| |
| /* On exit, manager->monitor is already NULL. */ |
| if (!monitor) |
| return; |
| |
| if (result != EVENT_RESULT_SUCCESS) { |
| (void) device_add_property(dev, "UDEV_WORKER_FAILED", "1"); |
| |
| switch (result) { |
| case EVENT_RESULT_NERRNO_MIN ... EVENT_RESULT_NERRNO_MAX: { |
| const char *str; |
| |
| (void) device_add_propertyf(dev, "UDEV_WORKER_ERRNO", "%i", -result); |
| |
| str = errno_to_name(result); |
| if (str) |
| (void) device_add_property(dev, "UDEV_WORKER_ERRNO_NAME", str); |
| break; |
| } |
| case EVENT_RESULT_EXIT_STATUS_BASE ... EVENT_RESULT_EXIT_STATUS_MAX: |
| (void) device_add_propertyf(dev, "UDEV_WORKER_EXIT_STATUS", "%i", result - EVENT_RESULT_EXIT_STATUS_BASE); |
| break; |
| |
| case EVENT_RESULT_TRY_AGAIN: |
| assert_not_reached(); |
| break; |
| |
| case EVENT_RESULT_SIGNAL_BASE ... EVENT_RESULT_SIGNAL_MAX: { |
| const char *str; |
| |
| (void) device_add_propertyf(dev, "UDEV_WORKER_SIGNAL", "%i", result - EVENT_RESULT_SIGNAL_BASE); |
| |
| str = signal_to_string(result - EVENT_RESULT_SIGNAL_BASE); |
| if (str) |
| (void) device_add_property(dev, "UDEV_WORKER_SIGNAL_NAME", str); |
| break; |
| } |
| default: |
| log_device_warning(dev, "Unknown event result \"%i\", ignoring.", result); |
| } |
| } |
| |
| r = device_monitor_send_device(monitor, NULL, dev); |
| if (r < 0) |
| log_device_warning_errno(dev, r, |
| "Failed to broadcast event to libudev listeners, ignoring: %m"); |
| } |
| |
| static int worker_send_result(Manager *manager, EventResult result) { |
| assert(manager); |
| assert(manager->worker_watch[WRITE_END] >= 0); |
| |
| return loop_write(manager->worker_watch[WRITE_END], &result, sizeof(result), false); |
| } |
| |
| static int device_get_whole_disk(sd_device *dev, sd_device **ret_device, const char **ret_devname) { |
| const char *val; |
| int r; |
| |
| assert(dev); |
| |
| if (device_for_action(dev, SD_DEVICE_REMOVE)) |
| goto irrelevant; |
| |
| r = sd_device_get_sysname(dev, &val); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to get sysname: %m"); |
| |
| /* Exclude the following devices: |
| * For "dm-", see the comment added by e918a1b5a94f270186dca59156354acd2a596494. |
| * For "md", see the commit message of 2e5b17d01347d3c3118be2b8ad63d20415dbb1f0, |
| * but not sure the assumption is still valid even when partitions are created on the md |
| * devices, surprisingly which seems to be possible, see PR #22973. |
| * For "drbd", see the commit message of fee854ee8ccde0cd28e0f925dea18cce35f3993d. */ |
| if (STARTSWITH_SET(val, "dm-", "md", "drbd")) |
| goto irrelevant; |
| |
| r = block_device_get_whole_disk(dev, &dev); |
| if (IN_SET(r, |
| -ENOTBLK, /* The device is not a block device. */ |
| -ENODEV /* The whole disk device was not found, it may already be removed. */)) |
| goto irrelevant; |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to get whole disk device: %m"); |
| |
| r = sd_device_get_devname(dev, &val); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to get devname: %m"); |
| |
| if (ret_device) |
| *ret_device = dev; |
| if (ret_devname) |
| *ret_devname = val; |
| return 1; |
| |
| irrelevant: |
| if (ret_device) |
| *ret_device = NULL; |
| if (ret_devname) |
| *ret_devname = NULL; |
| return 0; |
| } |
| |
| static int worker_lock_whole_disk(sd_device *dev, int *ret_fd) { |
| _cleanup_close_ int fd = -EBADF; |
| sd_device *dev_whole_disk; |
| const char *val; |
| int r; |
| |
| assert(dev); |
| assert(ret_fd); |
| |
| /* Take a shared lock on the device node; this establishes a concept of device "ownership" to |
| * serialize device access. External processes holding an exclusive lock will cause udev to skip the |
| * event handling; in the case udev acquired the lock, the external process can block until udev has |
| * finished its event handling. */ |
| |
| r = device_get_whole_disk(dev, &dev_whole_disk, &val); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| goto nolock; |
| |
| fd = sd_device_open(dev_whole_disk, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); |
| if (fd < 0) { |
| bool ignore = ERRNO_IS_DEVICE_ABSENT(fd); |
| |
| log_device_debug_errno(dev, fd, "Failed to open '%s'%s: %m", val, ignore ? ", ignoring" : ""); |
| if (!ignore) |
| return fd; |
| |
| goto nolock; |
| } |
| |
| if (flock(fd, LOCK_SH|LOCK_NB) < 0) |
| return log_device_debug_errno(dev, errno, "Failed to flock(%s): %m", val); |
| |
| *ret_fd = TAKE_FD(fd); |
| return 1; |
| |
| nolock: |
| *ret_fd = -EBADF; |
| return 0; |
| } |
| |
| static int worker_mark_block_device_read_only(sd_device *dev) { |
| _cleanup_close_ int fd = -EBADF; |
| const char *val; |
| int state = 1, r; |
| |
| assert(dev); |
| |
| if (!arg_blockdev_read_only) |
| return 0; |
| |
| /* Do this only once, when the block device is new. If the device is later retriggered let's not |
| * toggle the bit again, so that people can boot up with full read-only mode and then unset the bit |
| * for specific devices only. */ |
| if (!device_for_action(dev, SD_DEVICE_ADD)) |
| return 0; |
| |
| r = sd_device_get_subsystem(dev, &val); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to get subsystem: %m"); |
| |
| if (!streq(val, "block")) |
| return 0; |
| |
| r = sd_device_get_sysname(dev, &val); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to get sysname: %m"); |
| |
| /* Exclude synthetic devices for now, this is supposed to be a safety feature to avoid modification |
| * of physical devices, and what sits on top of those doesn't really matter if we don't allow the |
| * underlying block devices to receive changes. */ |
| if (STARTSWITH_SET(val, "dm-", "md", "drbd", "loop", "nbd", "zram")) |
| return 0; |
| |
| fd = sd_device_open(dev, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); |
| if (fd < 0) |
| return log_device_debug_errno(dev, fd, "Failed to open '%s', ignoring: %m", val); |
| |
| if (ioctl(fd, BLKROSET, &state) < 0) |
| return log_device_warning_errno(dev, errno, "Failed to mark block device '%s' read-only: %m", val); |
| |
| log_device_info(dev, "Successfully marked block device '%s' read-only.", val); |
| return 0; |
| } |
| |
| static int worker_process_device(Manager *manager, sd_device *dev) { |
| _cleanup_(udev_event_freep) UdevEvent *udev_event = NULL; |
| _cleanup_close_ int fd_lock = -EBADF; |
| int r; |
| |
| assert(manager); |
| assert(dev); |
| |
| log_device_uevent(dev, "Processing device"); |
| |
| udev_event = udev_event_new(dev, arg_exec_delay_usec, manager->rtnl, manager->log_level); |
| if (!udev_event) |
| return -ENOMEM; |
| |
| /* If this is a block device and the device is locked currently via the BSD advisory locks, |
| * someone else is using it exclusively. We don't run our udev rules now to not interfere. |
| * Instead of processing the event, we requeue the event and will try again after a delay. |
| * |
| * The user-facing side of this: https://systemd.io/BLOCK_DEVICE_LOCKING */ |
| r = worker_lock_whole_disk(dev, &fd_lock); |
| if (r == -EAGAIN) |
| return EVENT_RESULT_TRY_AGAIN; |
| if (r < 0) |
| return r; |
| |
| (void) worker_mark_block_device_read_only(dev); |
| |
| /* apply rules, create node, symlinks */ |
| r = udev_event_execute_rules( |
| udev_event, |
| manager->inotify_fd, |
| arg_event_timeout_usec, |
| arg_timeout_signal, |
| manager->properties, |
| manager->rules); |
| if (r < 0) |
| return r; |
| |
| udev_event_execute_run(udev_event, arg_event_timeout_usec, arg_timeout_signal); |
| |
| if (!manager->rtnl) |
| /* in case rtnl was initialized */ |
| manager->rtnl = sd_netlink_ref(udev_event->rtnl); |
| |
| if (udev_event->inotify_watch) { |
| r = udev_watch_begin(manager->inotify_fd, dev); |
| if (r < 0 && r != -ENOENT) /* The device may be already removed, ignore -ENOENT. */ |
| log_device_warning_errno(dev, r, "Failed to add inotify watch, ignoring: %m"); |
| } |
| |
| log_device_uevent(dev, "Device processed"); |
| return 0; |
| } |
| |
| static int worker_device_monitor_handler(sd_device_monitor *monitor, sd_device *dev, void *userdata) { |
| Manager *manager = ASSERT_PTR(userdata); |
| int r; |
| |
| assert(dev); |
| |
| r = worker_process_device(manager, dev); |
| if (r == EVENT_RESULT_TRY_AGAIN) |
| /* if we couldn't acquire the flock(), then requeue the event */ |
| log_device_debug(dev, "Block device is currently locked, requeueing the event."); |
| else { |
| if (r < 0) |
| log_device_warning_errno(dev, r, "Failed to process device, ignoring: %m"); |
| |
| /* send processed event back to libudev listeners */ |
| device_broadcast(monitor, dev, r); |
| } |
| |
| /* send udevd the result of the event execution */ |
| r = worker_send_result(manager, r); |
| if (r < 0) |
| log_device_warning_errno(dev, r, "Failed to send signal to main daemon, ignoring: %m"); |
| |
| /* Reset the log level, as it might be changed by "OPTIONS=log_level=". */ |
| log_set_max_level(manager->log_level); |
| |
| return 1; |
| } |
| |
| static int worker_main(Manager *_manager, sd_device_monitor *monitor, sd_device *first_device) { |
| _cleanup_(sd_device_unrefp) sd_device *dev = first_device; |
| _cleanup_(manager_freep) Manager *manager = _manager; |
| int r; |
| |
| assert(manager); |
| assert(monitor); |
| assert(dev); |
| |
| assert_se(unsetenv("NOTIFY_SOCKET") == 0); |
| |
| assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, -1) >= 0); |
| |
| /* Reset OOM score, we only protect the main daemon. */ |
| r = set_oom_score_adjust(0); |
| if (r < 0) |
| log_debug_errno(r, "Failed to reset OOM score, ignoring: %m"); |
| |
| /* Clear unnecessary data in Manager object. */ |
| manager_clear_for_worker(manager); |
| |
| r = sd_event_new(&manager->event); |
| if (r < 0) |
| return log_error_errno(r, "Failed to allocate event loop: %m"); |
| |
| r = sd_event_add_signal(manager->event, NULL, SIGTERM, NULL, NULL); |
| if (r < 0) |
| return log_error_errno(r, "Failed to set SIGTERM event: %m"); |
| |
| r = sd_device_monitor_attach_event(monitor, manager->event); |
| if (r < 0) |
| return log_error_errno(r, "Failed to attach event loop to device monitor: %m"); |
| |
| r = sd_device_monitor_start(monitor, worker_device_monitor_handler, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to start device monitor: %m"); |
| |
| /* Process first device */ |
| (void) worker_device_monitor_handler(monitor, dev, manager); |
| |
| r = sd_event_loop(manager->event); |
| if (r < 0) |
| return log_error_errno(r, "Event loop failed: %m"); |
| |
| return 0; |
| } |
| |
| static int on_event_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
| Event *event = ASSERT_PTR(userdata); |
| |
| assert(event->worker); |
| |
| kill_and_sigcont(event->worker->pid, arg_timeout_signal); |
| event->worker->state = WORKER_KILLED; |
| |
| log_device_error(event->dev, "Worker ["PID_FMT"] processing SEQNUM=%"PRIu64" killed", event->worker->pid, event->seqnum); |
| |
| return 1; |
| } |
| |
| static int on_event_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) { |
| Event *event = ASSERT_PTR(userdata); |
| |
| assert(event->worker); |
| |
| log_device_warning(event->dev, "Worker ["PID_FMT"] processing SEQNUM=%"PRIu64" is taking a long time", event->worker->pid, event->seqnum); |
| |
| return 1; |
| } |
| |
| static void worker_attach_event(Worker *worker, Event *event) { |
| sd_event *e; |
| |
| assert(worker); |
| assert(worker->manager); |
| assert(event); |
| assert(!event->worker); |
| assert(!worker->event); |
| |
| worker->state = WORKER_RUNNING; |
| worker->event = event; |
| event->state = EVENT_RUNNING; |
| event->worker = worker; |
| |
| e = worker->manager->event; |
| |
| (void) sd_event_add_time_relative(e, &event->timeout_warning_event, CLOCK_MONOTONIC, |
| udev_warn_timeout(arg_event_timeout_usec), USEC_PER_SEC, |
| on_event_timeout_warning, event); |
| |
| (void) sd_event_add_time_relative(e, &event->timeout_event, CLOCK_MONOTONIC, |
| arg_event_timeout_usec, USEC_PER_SEC, |
| on_event_timeout, event); |
| } |
| |
| static int worker_spawn(Manager *manager, Event *event) { |
| _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *worker_monitor = NULL; |
| Worker *worker; |
| pid_t pid; |
| int r; |
| |
| /* listen for new events */ |
| r = device_monitor_new_full(&worker_monitor, MONITOR_GROUP_NONE, -1); |
| if (r < 0) |
| return r; |
| |
| (void) sd_device_monitor_set_description(worker_monitor, "worker"); |
| |
| /* allow the main daemon netlink address to send devices to the worker */ |
| r = device_monitor_allow_unicast_sender(worker_monitor, manager->monitor); |
| if (r < 0) |
| return log_error_errno(r, "Worker: Failed to set unicast sender: %m"); |
| |
| r = device_monitor_enable_receiving(worker_monitor); |
| if (r < 0) |
| return log_error_errno(r, "Worker: Failed to enable receiving of device: %m"); |
| |
| r = safe_fork("(udev-worker)", FORK_DEATHSIG, &pid); |
| if (r < 0) { |
| event->state = EVENT_QUEUED; |
| return log_error_errno(r, "Failed to fork() worker: %m"); |
| } |
| if (r == 0) { |
| DEVICE_TRACE_POINT(worker_spawned, event->dev, getpid()); |
| |
| /* Worker process */ |
| r = worker_main(manager, worker_monitor, sd_device_ref(event->dev)); |
| log_close(); |
| _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); |
| } |
| |
| r = worker_new(&worker, manager, worker_monitor, pid); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create worker object: %m"); |
| |
| worker_attach_event(worker, event); |
| |
| log_device_debug(event->dev, "Worker ["PID_FMT"] is forked for processing SEQNUM=%"PRIu64".", pid, event->seqnum); |
| return 0; |
| } |
| |
| static int event_run(Event *event) { |
| static bool log_children_max_reached = true; |
| Manager *manager; |
| Worker *worker; |
| int r; |
| |
| assert(event); |
| assert(event->manager); |
| |
| log_device_uevent(event->dev, "Device ready for processing"); |
| |
| (void) event_source_disable(event->retry_event_source); |
| |
| manager = event->manager; |
| HASHMAP_FOREACH(worker, manager->workers) { |
| if (worker->state != WORKER_IDLE) |
| continue; |
| |
| r = device_monitor_send_device(manager->monitor, worker->monitor, event->dev); |
| if (r < 0) { |
| log_device_error_errno(event->dev, r, "Worker ["PID_FMT"] did not accept message, killing the worker: %m", |
| worker->pid); |
| (void) kill(worker->pid, SIGKILL); |
| worker->state = WORKER_KILLED; |
| continue; |
| } |
| worker_attach_event(worker, event); |
| return 1; /* event is now processing. */ |
| } |
| |
| if (hashmap_size(manager->workers) >= arg_children_max) { |
| /* Avoid spamming the debug logs if the limit is already reached and |
| * many events still need to be processed */ |
| if (log_children_max_reached && arg_children_max > 1) { |
| log_debug("Maximum number (%u) of children reached.", hashmap_size(manager->workers)); |
| log_children_max_reached = false; |
| } |
| return 0; /* no free worker */ |
| } |
| |
| /* Re-enable the debug message for the next batch of events */ |
| log_children_max_reached = true; |
| |
| /* start new worker and pass initial device */ |
| r = worker_spawn(manager, event); |
| if (r < 0) |
| return r; |
| |
| return 1; /* event is now processing. */ |
| } |
| |
| static int event_is_blocked(Event *event) { |
| Event *loop_event = NULL; |
| int r; |
| |
| /* lookup event for identical, parent, child device */ |
| |
| assert(event); |
| assert(event->manager); |
| assert(event->blocker_seqnum <= event->seqnum); |
| |
| if (event->retry_again_next_usec > 0) { |
| usec_t now_usec; |
| |
| r = sd_event_now(event->manager->event, CLOCK_BOOTTIME, &now_usec); |
| if (r < 0) |
| return r; |
| |
| if (event->retry_again_next_usec > now_usec) |
| return true; |
| } |
| |
| if (event->blocker_seqnum == event->seqnum) |
| /* we have checked previously and no blocker found */ |
| return false; |
| |
| LIST_FOREACH(event, e, event->manager->events) { |
| loop_event = e; |
| |
| /* we already found a later event, earlier cannot block us, no need to check again */ |
| if (loop_event->seqnum < event->blocker_seqnum) |
| continue; |
| |
| /* event we checked earlier still exists, no need to check again */ |
| if (loop_event->seqnum == event->blocker_seqnum) |
| return true; |
| |
| /* found ourself, no later event can block us */ |
| if (loop_event->seqnum >= event->seqnum) |
| goto no_blocker; |
| |
| /* found event we have not checked */ |
| break; |
| } |
| |
| assert(loop_event); |
| assert(loop_event->seqnum > event->blocker_seqnum && |
| loop_event->seqnum < event->seqnum); |
| |
| /* check if queue contains events we depend on */ |
| LIST_FOREACH(event, e, loop_event) { |
| loop_event = e; |
| |
| /* found ourself, no later event can block us */ |
| if (loop_event->seqnum >= event->seqnum) |
| goto no_blocker; |
| |
| if (streq_ptr(loop_event->id, event->id)) |
| break; |
| |
| if (devpath_conflict(event->devpath, loop_event->devpath) || |
| devpath_conflict(event->devpath, loop_event->devpath_old) || |
| devpath_conflict(event->devpath_old, loop_event->devpath)) |
| break; |
| |
| if (event->devnode && streq_ptr(event->devnode, loop_event->devnode)) |
| break; |
| } |
| |
| assert(loop_event); |
| |
| log_device_debug(event->dev, "SEQNUM=%" PRIu64 " blocked by SEQNUM=%" PRIu64, |
| event->seqnum, loop_event->seqnum); |
| |
| event->blocker_seqnum = loop_event->seqnum; |
| return true; |
| |
| no_blocker: |
| event->blocker_seqnum = event->seqnum; |
| return false; |
| } |
| |
| static int event_queue_start(Manager *manager) { |
| int r; |
| |
| assert(manager); |
| |
| if (!manager->events || manager->exit || manager->stop_exec_queue) |
| return 0; |
| |
| /* To make the stack directory /run/udev/links cleaned up later. */ |
| manager->udev_node_needs_cleanup = true; |
| |
| r = event_source_disable(manager->kill_workers_event); |
| if (r < 0) |
| log_warning_errno(r, "Failed to disable event source for cleaning up idle workers, ignoring: %m"); |
| |
| manager_reload(manager, /* force = */ false); |
| |
| LIST_FOREACH(event, event, manager->events) { |
| if (event->state != EVENT_QUEUED) |
| continue; |
| |
| /* do not start event if parent or child event is still running or queued */ |
| r = event_is_blocked(event); |
| if (r > 0) |
| continue; |
| if (r < 0) |
| log_device_warning_errno(event->dev, r, |
| "Failed to check dependencies for event (SEQNUM=%"PRIu64", ACTION=%s), " |
| "assuming there is no blocking event, ignoring: %m", |
| event->seqnum, |
| strna(device_action_to_string(event->action))); |
| |
| r = event_run(event); |
| if (r <= 0) /* 0 means there are no idle workers. Let's escape from the loop. */ |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| static int on_event_retry(sd_event_source *s, uint64_t usec, void *userdata) { |
| /* This does nothing. The on_post() callback will start the event if there exists an idle worker. */ |
| return 1; |
| } |
| |
| static int event_requeue(Event *event) { |
| usec_t now_usec; |
| int r; |
| |
| assert(event); |
| assert(event->manager); |
| assert(event->manager->event); |
| |
| event->timeout_warning_event = sd_event_source_disable_unref(event->timeout_warning_event); |
| event->timeout_event = sd_event_source_disable_unref(event->timeout_event); |
| |
| /* add a short delay to suppress busy loop */ |
| r = sd_event_now(event->manager->event, CLOCK_BOOTTIME, &now_usec); |
| if (r < 0) |
| return log_device_warning_errno(event->dev, r, |
| "Failed to get current time, " |
| "skipping event (SEQNUM=%"PRIu64", ACTION=%s): %m", |
| event->seqnum, strna(device_action_to_string(event->action))); |
| |
| if (event->retry_again_timeout_usec > 0 && event->retry_again_timeout_usec <= now_usec) |
| return log_device_warning_errno(event->dev, SYNTHETIC_ERRNO(ETIMEDOUT), |
| "The underlying block device is locked by a process more than %s, " |
| "skipping event (SEQNUM=%"PRIu64", ACTION=%s).", |
| FORMAT_TIMESPAN(EVENT_RETRY_TIMEOUT_USEC, USEC_PER_MINUTE), |
| event->seqnum, strna(device_action_to_string(event->action))); |
| |
| event->retry_again_next_usec = usec_add(now_usec, EVENT_RETRY_INTERVAL_USEC); |
| if (event->retry_again_timeout_usec == 0) |
| event->retry_again_timeout_usec = usec_add(now_usec, EVENT_RETRY_TIMEOUT_USEC); |
| |
| r = event_reset_time_relative(event->manager->event, &event->retry_event_source, |
| CLOCK_MONOTONIC, EVENT_RETRY_INTERVAL_USEC, 0, |
| on_event_retry, NULL, |
| 0, "retry-event", true); |
| if (r < 0) |
| return log_device_warning_errno(event->dev, r, "Failed to reset timer event source for retrying event, " |
| "skipping event (SEQNUM=%"PRIu64", ACTION=%s): %m", |
| event->seqnum, strna(device_action_to_string(event->action))); |
| |
| if (event->worker && event->worker->event == event) |
| event->worker->event = NULL; |
| event->worker = NULL; |
| |
| event->state = EVENT_QUEUED; |
| return 0; |
| } |
| |
| static int event_queue_assume_block_device_unlocked(Manager *manager, sd_device *dev) { |
| const char *devname; |
| int r; |
| |
| /* When a new event for a block device is queued or we get an inotify event, assume that the |
| * device is not locked anymore. The assumption may not be true, but that should not cause any |
| * issues, as in that case events will be requeued soon. */ |
| |
| r = device_get_whole_disk(dev, NULL, &devname); |
| if (r <= 0) |
| return r; |
| |
| LIST_FOREACH(event, event, manager->events) { |
| const char *event_devname; |
| |
| if (event->state != EVENT_QUEUED) |
| continue; |
| |
| if (event->retry_again_next_usec == 0) |
| continue; |
| |
| if (device_get_whole_disk(event->dev, NULL, &event_devname) <= 0) |
| continue; |
| |
| if (!streq(devname, event_devname)) |
| continue; |
| |
| event->retry_again_next_usec = 0; |
| } |
| |
| return 0; |
| } |
| |
| static int event_queue_insert(Manager *manager, sd_device *dev) { |
| const char *devpath, *devpath_old = NULL, *id = NULL, *devnode = NULL; |
| sd_device_action_t action; |
| uint64_t seqnum; |
| Event *event; |
| int r; |
| |
| assert(manager); |
| assert(dev); |
| |
| /* only one process can add events to the queue */ |
| assert(manager->pid == getpid_cached()); |
| |
| /* We only accepts devices received by device monitor. */ |
| r = sd_device_get_seqnum(dev, &seqnum); |
| if (r < 0) |
| return r; |
| |
| r = sd_device_get_action(dev, &action); |
| if (r < 0) |
| return r; |
| |
| r = sd_device_get_devpath(dev, &devpath); |
| if (r < 0) |
| return r; |
| |
| r = sd_device_get_property_value(dev, "DEVPATH_OLD", &devpath_old); |
| if (r < 0 && r != -ENOENT) |
| return r; |
| |
| r = device_get_device_id(dev, &id); |
| if (r < 0 && r != -ENOENT) |
| return r; |
| |
| r = sd_device_get_devname(dev, &devnode); |
| if (r < 0 && r != -ENOENT) |
| return r; |
| |
| event = new(Event, 1); |
| if (!event) |
| return -ENOMEM; |
| |
| *event = (Event) { |
| .manager = manager, |
| .dev = sd_device_ref(dev), |
| .seqnum = seqnum, |
| .action = action, |
| .id = id, |
| .devpath = devpath, |
| .devpath_old = devpath_old, |
| .devnode = devnode, |
| .state = EVENT_QUEUED, |
| }; |
| |
| if (!manager->events) { |
| r = touch("/run/udev/queue"); |
| if (r < 0) |
| log_warning_errno(r, "Failed to touch /run/udev/queue, ignoring: %m"); |
| } |
| |
| LIST_APPEND(event, manager->events, event); |
| |
| log_device_uevent(dev, "Device is queued"); |
| |
| return 0; |
| } |
| |
| static int on_uevent(sd_device_monitor *monitor, sd_device *dev, void *userdata) { |
| Manager *manager = ASSERT_PTR(userdata); |
| int r; |
| |
| DEVICE_TRACE_POINT(kernel_uevent_received, dev); |
| |
| device_ensure_usec_initialized(dev, NULL); |
| |
| r = event_queue_insert(manager, dev); |
| if (r < 0) { |
| log_device_error_errno(dev, r, "Failed to insert device into event queue: %m"); |
| return 1; |
| } |
| |
| (void) event_queue_assume_block_device_unlocked(manager, dev); |
| |
| return 1; |
| } |
| |
| static int on_worker(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
| Manager *manager = ASSERT_PTR(userdata); |
| |
| for (;;) { |
| EventResult result; |
| struct iovec iovec = IOVEC_MAKE(&result, sizeof(result)); |
| CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred))) control; |
| struct msghdr msghdr = { |
| .msg_iov = &iovec, |
| .msg_iovlen = 1, |
| .msg_control = &control, |
| .msg_controllen = sizeof(control), |
| }; |
| ssize_t size; |
| struct ucred *ucred; |
| Worker *worker; |
| |
| size = recvmsg_safe(fd, &msghdr, MSG_DONTWAIT); |
| if (size == -EINTR) |
| continue; |
| if (size == -EAGAIN) |
| /* nothing more to read */ |
| break; |
| if (size < 0) |
| return log_error_errno(size, "Failed to receive message: %m"); |
| |
| cmsg_close_all(&msghdr); |
| |
| if (size != sizeof(result)) { |
| log_warning("Ignoring worker message with invalid size %zi bytes", size); |
| continue; |
| } |
| |
| ucred = CMSG_FIND_DATA(&msghdr, SOL_SOCKET, SCM_CREDENTIALS, struct ucred); |
| if (!ucred || ucred->pid <= 0) { |
| log_warning("Ignoring worker message without valid PID"); |
| continue; |
| } |
| |
| /* lookup worker who sent the signal */ |
| worker = hashmap_get(manager->workers, PID_TO_PTR(ucred->pid)); |
| if (!worker) { |
| log_debug("Worker ["PID_FMT"] returned, but is no longer tracked", ucred->pid); |
| continue; |
| } |
| |
| if (worker->state == WORKER_KILLING) { |
| worker->state = WORKER_KILLED; |
| (void) kill(worker->pid, SIGTERM); |
| } else if (worker->state != WORKER_KILLED) |
| worker->state = WORKER_IDLE; |
| |
| /* worker returned */ |
| if (result == EVENT_RESULT_TRY_AGAIN && |
| event_requeue(worker->event) < 0) |
| device_broadcast(manager->monitor, worker->event->dev, -ETIMEDOUT); |
| |
| /* When event_requeue() succeeds, worker->event is NULL, and event_free() handles NULL gracefully. */ |
| event_free(worker->event); |
| } |
| |
| return 1; |
| } |
| |
| /* receive the udevd message from userspace */ |
| static int on_ctrl_msg(UdevCtrl *uctrl, UdevCtrlMessageType type, const UdevCtrlMessageValue *value, void *userdata) { |
| Manager *manager = ASSERT_PTR(userdata); |
| int r; |
| |
| assert(value); |
| |
| switch (type) { |
| case UDEV_CTRL_SET_LOG_LEVEL: |
| if ((value->intval & LOG_PRIMASK) != value->intval) { |
| log_debug("Received invalid udev control message (SET_LOG_LEVEL, %i), ignoring.", value->intval); |
| break; |
| } |
| |
| log_debug("Received udev control message (SET_LOG_LEVEL), setting log_level=%i", value->intval); |
| |
| r = log_get_max_level(); |
| if (r == value->intval) |
| break; |
| |
| log_set_max_level(value->intval); |
| manager->log_level = value->intval; |
| manager_kill_workers(manager, false); |
| break; |
| case UDEV_CTRL_STOP_EXEC_QUEUE: |
| log_debug("Received udev control message (STOP_EXEC_QUEUE)"); |
| manager->stop_exec_queue = true; |
| break; |
| case UDEV_CTRL_START_EXEC_QUEUE: |
| log_debug("Received udev control message (START_EXEC_QUEUE)"); |
| manager->stop_exec_queue = false; |
| /* It is not necessary to call event_queue_start() here, as it will be called in on_post() if necessary. */ |
| break; |
| case UDEV_CTRL_RELOAD: |
| log_debug("Received udev control message (RELOAD)"); |
| manager_reload(manager, /* force = */ true); |
| break; |
| case UDEV_CTRL_SET_ENV: { |
| _unused_ _cleanup_free_ char *old_val = NULL; |
| _cleanup_free_ char *key = NULL, *val = NULL, *old_key = NULL; |
| const char *eq; |
| |
| eq = strchr(value->buf, '='); |
| if (!eq) { |
| log_error("Invalid key format '%s'", value->buf); |
| return 1; |
| } |
| |
| key = strndup(value->buf, eq - value->buf); |
| if (!key) { |
| log_oom(); |
| return 1; |
| } |
| |
| old_val = hashmap_remove2(manager->properties, key, (void **) &old_key); |
| |
| r = hashmap_ensure_allocated(&manager->properties, &string_hash_ops); |
| if (r < 0) { |
| log_oom(); |
| return 1; |
| } |
| |
| eq++; |
| if (isempty(eq)) { |
| log_debug("Received udev control message (ENV), unsetting '%s'", key); |
| |
| r = hashmap_put(manager->properties, key, NULL); |
| if (r < 0) { |
| log_oom(); |
| return 1; |
| } |
| } else { |
| val = strdup(eq); |
| if (!val) { |
| log_oom(); |
| return 1; |
| } |
| |
| log_debug("Received udev control message (ENV), setting '%s=%s'", key, val); |
| |
| r = hashmap_put(manager->properties, key, val); |
| if (r < 0) { |
| log_oom(); |
| return 1; |
| } |
| } |
| |
| key = val = NULL; |
| manager_kill_workers(manager, false); |
| break; |
| } |
| case UDEV_CTRL_SET_CHILDREN_MAX: |
| if (value->intval <= 0) { |
| log_debug("Received invalid udev control message (SET_MAX_CHILDREN, %i), ignoring.", value->intval); |
| return 0; |
| } |
| |
| log_debug("Received udev control message (SET_MAX_CHILDREN), setting children_max=%i", value->intval); |
| arg_children_max = value->intval; |
| |
| notify_ready(); |
| break; |
| case UDEV_CTRL_PING: |
| log_debug("Received udev control message (PING)"); |
| break; |
| case UDEV_CTRL_EXIT: |
| log_debug("Received udev control message (EXIT)"); |
| manager_exit(manager); |
| break; |
| default: |
| log_debug("Received unknown udev control message, ignoring"); |
| } |
| |
| return 1; |
| } |
| |
| static int synthesize_change_one(sd_device *dev, sd_device *target) { |
| int r; |
| |
| if (DEBUG_LOGGING) { |
| const char *syspath = NULL; |
| (void) sd_device_get_syspath(target, &syspath); |
| log_device_debug(dev, "device is closed, synthesising 'change' on %s", strna(syspath)); |
| } |
| |
| r = sd_device_trigger(target, SD_DEVICE_CHANGE); |
| if (r < 0) |
| return log_device_debug_errno(target, r, "Failed to trigger 'change' uevent: %m"); |
| |
| DEVICE_TRACE_POINT(synthetic_change_event, dev); |
| |
| return 0; |
| } |
| |
| static int synthesize_change(sd_device *dev) { |
| _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; |
| bool part_table_read; |
| const char *sysname; |
| sd_device *d; |
| int r, k; |
| |
| r = sd_device_get_sysname(dev, &sysname); |
| if (r < 0) |
| return r; |
| |
| if (startswith(sysname, "dm-") || block_device_is_whole_disk(dev) <= 0) |
| return synthesize_change_one(dev, dev); |
| |
| r = blockdev_reread_partition_table(dev); |
| if (r < 0) |
| log_device_debug_errno(dev, r, "Failed to re-read partition table, ignoring: %m"); |
| part_table_read = r >= 0; |
| |
| /* search for partitions */ |
| r = partition_enumerator_new(dev, &e); |
| if (r < 0) |
| return r; |
| |
| /* We have partitions and re-read the table, the kernel already sent out a "change" |
| * event for the disk, and "remove/add" for all partitions. */ |
| if (part_table_read && sd_device_enumerator_get_device_first(e)) |
| return 0; |
| |
| /* We have partitions but re-reading the partition table did not work, synthesize |
| * "change" for the disk and all partitions. */ |
| r = synthesize_change_one(dev, dev); |
| FOREACH_DEVICE(e, d) { |
| k = synthesize_change_one(dev, d); |
| if (k < 0 && r >= 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| static int on_inotify(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
| Manager *manager = ASSERT_PTR(userdata); |
| union inotify_event_buffer buffer; |
| ssize_t l; |
| int r; |
| |
| l = read(fd, &buffer, sizeof(buffer)); |
| if (l < 0) { |
| if (ERRNO_IS_TRANSIENT(errno)) |
| return 0; |
| |
| return log_error_errno(errno, "Failed to read inotify fd: %m"); |
| } |
| |
| FOREACH_INOTIFY_EVENT_WARN(e, buffer, l) { |
| _cleanup_(sd_device_unrefp) sd_device *dev = NULL; |
| const char *devnode; |
| |
| /* Do not handle IN_IGNORED here. Especially, do not try to call udev_watch_end() from the |
| * main process. Otherwise, the pair of the symlinks may become inconsistent, and several |
| * garbage may remain. The old symlinks are removed by a worker that processes the |
| * corresponding 'remove' uevent; |
| * udev_event_execute_rules() -> event_execute_rules_on_remove() -> udev_watch_end(). */ |
| |
| if (!FLAGS_SET(e->mask, IN_CLOSE_WRITE)) |
| continue; |
| |
| r = device_new_from_watch_handle(&dev, e->wd); |
| if (r < 0) { |
| /* Device may be removed just after closed. */ |
| log_debug_errno(r, "Failed to create sd_device object from watch handle, ignoring: %m"); |
| continue; |
| } |
| |
| r = sd_device_get_devname(dev, &devnode); |
| if (r < 0) { |
| /* Also here, device may be already removed. */ |
| log_device_debug_errno(dev, r, "Failed to get device node, ignoring: %m"); |
| continue; |
| } |
| |
| log_device_debug(dev, "Received inotify event for %s.", devnode); |
| |
| (void) event_queue_assume_block_device_unlocked(manager, dev); |
| (void) synthesize_change(dev); |
| } |
| |
| return 0; |
| } |
| |
| static int on_sigterm(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
| Manager *manager = ASSERT_PTR(userdata); |
| |
| manager_exit(manager); |
| |
| return 1; |
| } |
| |
| static int on_sighup(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
| Manager *manager = ASSERT_PTR(userdata); |
| |
| manager_reload(manager, /* force = */ true); |
| |
| return 1; |
| } |
| |
| static int on_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata) { |
| Worker *worker = ASSERT_PTR(userdata); |
| Manager *manager = ASSERT_PTR(worker->manager); |
| sd_device *dev = worker->event ? ASSERT_PTR(worker->event->dev) : NULL; |
| EventResult result; |
| |
| assert(si); |
| |
| switch (si->si_code) { |
| case CLD_EXITED: |
| if (si->si_status == 0) |
| log_device_debug(dev, "Worker ["PID_FMT"] exited.", si->si_pid); |
| else |
| log_device_warning(dev, "Worker ["PID_FMT"] exited with return code %i.", |
| si->si_pid, si->si_status); |
| result = EVENT_RESULT_EXIT_STATUS_BASE + si->si_status; |
| break; |
| |
| case CLD_KILLED: |
| case CLD_DUMPED: |
| log_device_warning(dev, "Worker ["PID_FMT"] terminated by signal %i (%s).", |
| si->si_pid, si->si_status, signal_to_string(si->si_status)); |
| result = EVENT_RESULT_SIGNAL_BASE + si->si_status; |
| break; |
| |
| default: |
| assert_not_reached(); |
| } |
| |
| if (result != EVENT_RESULT_SUCCESS && dev) { |
| /* delete state from disk */ |
| device_delete_db(dev); |
| device_tag_index(dev, NULL, false); |
| |
| /* Forward kernel event to libudev listeners */ |
| device_broadcast(manager->monitor, dev, result); |
| } |
| |
| worker_free(worker); |
| |
| return 1; |
| } |
| |
| static int on_post(sd_event_source *s, void *userdata) { |
| Manager *manager = ASSERT_PTR(userdata); |
| |
| if (manager->events) { |
| /* Try to process pending events if idle workers exist. Why is this necessary? |
| * When a worker finished an event and became idle, even if there was a pending event, |
| * the corresponding device might have been locked and the processing of the event |
| * delayed for a while, preventing the worker from processing the event immediately. |
| * Now, the device may be unlocked. Let's try again! */ |
| event_queue_start(manager); |
| return 1; |
| } |
| |
| /* There are no queued events. Let's remove /run/udev/queue and clean up the idle processes. */ |
| |
| if (unlink("/run/udev/queue") < 0) { |
| if (errno != ENOENT) |
| log_warning_errno(errno, "Failed to unlink /run/udev/queue, ignoring: %m"); |
| } else |
| log_debug("No events are queued, removing /run/udev/queue."); |
| |
| if (!hashmap_isempty(manager->workers)) { |
| /* There are idle workers */ |
| (void) event_reset_time_relative(manager->event, &manager->kill_workers_event, |
| CLOCK_MONOTONIC, 3 * USEC_PER_SEC, USEC_PER_SEC, |
| on_kill_workers_event, manager, |
| 0, "kill-workers-event", false); |
| return 1; |
| } |
| |
| /* There are no idle workers. */ |
| |
| if (manager->udev_node_needs_cleanup) { |
| (void) udev_node_cleanup(); |
| manager->udev_node_needs_cleanup = false; |
| } |
| |
| if (manager->exit) |
| return sd_event_exit(manager->event, 0); |
| |
| if (manager->cgroup) |
| /* cleanup possible left-over processes in our cgroup */ |
| (void) cg_kill(SYSTEMD_CGROUP_CONTROLLER, manager->cgroup, SIGKILL, CGROUP_IGNORE_SELF, NULL, NULL, NULL); |
| |
| return 1; |
| } |
| |
| static int listen_fds(int *ret_ctrl, int *ret_netlink) { |
| int ctrl_fd = -EBADF, netlink_fd = -EBADF; |
| int fd, n; |
| |
| assert(ret_ctrl); |
| assert(ret_netlink); |
| |
| n = sd_listen_fds(true); |
| if (n < 0) |
| return n; |
| |
| for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) { |
| if (sd_is_socket(fd, AF_UNIX, SOCK_SEQPACKET, -1) > 0) { |
| if (ctrl_fd >= 0) |
| return -EINVAL; |
| ctrl_fd = fd; |
| continue; |
| } |
| |
| if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) { |
| if (netlink_fd >= 0) |
| return -EINVAL; |
| netlink_fd = fd; |
| continue; |
| } |
| |
| return -EINVAL; |
| } |
| |
| *ret_ctrl = ctrl_fd; |
| *ret_netlink = netlink_fd; |
| |
| return 0; |
| } |
| |
| /* |
| * read the kernel command line, in case we need to get into debug mode |
| * udev.log_level=<level> syslog priority |
| * udev.children_max=<number of workers> events are fully serialized if set to 1 |
| * udev.exec_delay=<number of seconds> delay execution of every executed program |
| * udev.event_timeout=<number of seconds> seconds to wait before terminating an event |
| * udev.blockdev_read_only<=bool> mark all block devices read-only when they appear |
| */ |
| static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { |
| int r; |
| |
| assert(key); |
| |
| if (proc_cmdline_key_streq(key, "udev.log_level") || |
| proc_cmdline_key_streq(key, "udev.log_priority")) { /* kept for backward compatibility */ |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| r = log_level_from_string(value); |
| if (r >= 0) |
| log_set_max_level(r); |
| |
| } else if (proc_cmdline_key_streq(key, "udev.event_timeout")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| r = parse_sec(value, &arg_event_timeout_usec); |
| |
| } else if (proc_cmdline_key_streq(key, "udev.children_max")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| r = safe_atou(value, &arg_children_max); |
| |
| } else if (proc_cmdline_key_streq(key, "udev.exec_delay")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| r = parse_sec(value, &arg_exec_delay_usec); |
| |
| } else if (proc_cmdline_key_streq(key, "udev.timeout_signal")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| r = signal_from_string(value); |
| if (r > 0) |
| arg_timeout_signal = r; |
| |
| } else if (proc_cmdline_key_streq(key, "udev.blockdev_read_only")) { |
| |
| if (!value) |
| arg_blockdev_read_only = true; |
| else { |
| r = parse_boolean(value); |
| if (r < 0) |
| log_warning_errno(r, "Failed to parse udev.blockdev-read-only argument, ignoring: %s", value); |
| else |
| arg_blockdev_read_only = r; |
| } |
| |
| if (arg_blockdev_read_only) |
| log_notice("All physical block devices will be marked read-only."); |
| |
| return 0; |
| |
| } else { |
| if (startswith(key, "udev.")) |
| log_warning("Unknown udev kernel command line option \"%s\", ignoring.", key); |
| |
| return 0; |
| } |
| |
| if (r < 0) |
| log_warning_errno(r, "Failed to parse \"%s=%s\", ignoring: %m", key, value); |
| |
| return 0; |
| } |
| |
| static int help(void) { |
| _cleanup_free_ char *link = NULL; |
| int r; |
| |
| r = terminal_urlify_man("systemd-udevd.service", "8", &link); |
| if (r < 0) |
| return log_oom(); |
| |
| printf("%s [OPTIONS...]\n\n" |
| "Rule-based manager for device events and files.\n\n" |
| " -h --help Print this message\n" |
| " -V --version Print version of the program\n" |
| " -d --daemon Detach and run in the background\n" |
| " -D --debug Enable debug output\n" |
| " -c --children-max=INT Set maximum number of workers\n" |
| " -e --exec-delay=SECONDS Seconds to wait before executing RUN=\n" |
| " -t --event-timeout=SECONDS Seconds to wait before terminating an event\n" |
| " -N --resolve-names=early|late|never\n" |
| " When to resolve users and groups\n" |
| "\nSee the %s for details.\n", |
| program_invocation_short_name, |
| link); |
| |
| return 0; |
| } |
| |
| static int parse_argv(int argc, char *argv[]) { |
| enum { |
| ARG_TIMEOUT_SIGNAL, |
| }; |
| |
| static const struct option options[] = { |
| { "daemon", no_argument, NULL, 'd' }, |
| { "debug", no_argument, NULL, 'D' }, |
| { "children-max", required_argument, NULL, 'c' }, |
| { "exec-delay", required_argument, NULL, 'e' }, |
| { "event-timeout", required_argument, NULL, 't' }, |
| { "resolve-names", required_argument, NULL, 'N' }, |
| { "help", no_argument, NULL, 'h' }, |
| { "version", no_argument, NULL, 'V' }, |
| { "timeout-signal", required_argument, NULL, ARG_TIMEOUT_SIGNAL }, |
| {} |
| }; |
| |
| int c, r; |
| |
| assert(argc >= 0); |
| assert(argv); |
| |
| while ((c = getopt_long(argc, argv, "c:de:Dt:N:hV", options, NULL)) >= 0) { |
| switch (c) { |
| |
| case 'd': |
| arg_daemonize = true; |
| break; |
| case 'c': |
| r = safe_atou(optarg, &arg_children_max); |
| if (r < 0) |
| log_warning_errno(r, "Failed to parse --children-max= value '%s', ignoring: %m", optarg); |
| break; |
| case 'e': |
| r = parse_sec(optarg, &arg_exec_delay_usec); |
| if (r < 0) |
| log_warning_errno(r, "Failed to parse --exec-delay= value '%s', ignoring: %m", optarg); |
| break; |
| case ARG_TIMEOUT_SIGNAL: |
| r = signal_from_string(optarg); |
| if (r <= 0) |
| log_warning_errno(r, "Failed to parse --timeout-signal= value '%s', ignoring: %m", optarg); |
| else |
| arg_timeout_signal = r; |
| |
| break; |
| case 't': |
| r = parse_sec(optarg, &arg_event_timeout_usec); |
| if (r < 0) |
| log_warning_errno(r, "Failed to parse --event-timeout= value '%s', ignoring: %m", optarg); |
| break; |
| case 'D': |
| arg_debug = true; |
| break; |
| case 'N': { |
| ResolveNameTiming t; |
| |
| t = resolve_name_timing_from_string(optarg); |
| if (t < 0) |
| log_warning("Invalid --resolve-names= value '%s', ignoring.", optarg); |
| else |
| arg_resolve_name_timing = t; |
| break; |
| } |
| case 'h': |
| return help(); |
| case 'V': |
| printf("%s\n", GIT_VERSION); |
| return 0; |
| case '?': |
| return -EINVAL; |
| default: |
| assert_not_reached(); |
| |
| } |
| } |
| |
| return 1; |
| } |
| |
| static int create_subcgroup(char **ret) { |
| _cleanup_free_ char *cgroup = NULL, *subcgroup = NULL; |
| int r; |
| |
| if (getppid() != 1) |
| return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "Not invoked by PID1."); |
| |
| r = sd_booted(); |
| if (r < 0) |
| return log_debug_errno(r, "Failed to check if systemd is running: %m"); |
| if (r == 0) |
| return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "systemd is not running."); |
| |
| /* Get our own cgroup, we regularly kill everything udev has left behind. |
| * We only do this on systemd systems, and only if we are directly spawned |
| * by PID1. Otherwise we are not guaranteed to have a dedicated cgroup. */ |
| |
| r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup); |
| if (r < 0) { |
| if (IN_SET(r, -ENOENT, -ENOMEDIUM)) |
| return log_debug_errno(r, "Dedicated cgroup not found: %m"); |
| return log_debug_errno(r, "Failed to get cgroup: %m"); |
| } |
| |
| r = cg_get_xattr_bool(SYSTEMD_CGROUP_CONTROLLER, cgroup, "trusted.delegate"); |
| if (r == 0 || (r < 0 && ERRNO_IS_XATTR_ABSENT(r))) |
| return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "The cgroup %s is not delegated to us.", cgroup); |
| if (r < 0) |
| return log_debug_errno(r, "Failed to read trusted.delegate attribute: %m"); |
| |
| /* We are invoked with our own delegated cgroup tree, let's move us one level down, so that we |
| * don't collide with the "no processes in inner nodes" rule of cgroups, when the service |
| * manager invokes the ExecReload= job in the .control/ subcgroup. */ |
| |
| subcgroup = path_join(cgroup, "/udev"); |
| if (!subcgroup) |
| return log_oom_debug(); |
| |
| r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, subcgroup, 0); |
| if (r < 0) |
| return log_debug_errno(r, "Failed to create %s subcgroup: %m", subcgroup); |
| |
| log_debug("Created %s subcgroup.", subcgroup); |
| if (ret) |
| *ret = TAKE_PTR(subcgroup); |
| return 0; |
| } |
| |
| static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent) { |
| _cleanup_(manager_freep) Manager *manager = NULL; |
| _cleanup_free_ char *cgroup = NULL; |
| int r; |
| |
| assert(ret); |
| |
| (void) create_subcgroup(&cgroup); |
| |
| manager = new(Manager, 1); |
| if (!manager) |
| return log_oom(); |
| |
| *manager = (Manager) { |
| .inotify_fd = -EBADF, |
| .worker_watch = PIPE_EBADF, |
| .cgroup = TAKE_PTR(cgroup), |
| }; |
| |
| r = udev_ctrl_new_from_fd(&manager->ctrl, fd_ctrl); |
| if (r < 0) |
| return log_error_errno(r, "Failed to initialize udev control socket: %m"); |
| |
| r = udev_ctrl_enable_receiving(manager->ctrl); |
| if (r < 0) |
| return log_error_errno(r, "Failed to bind udev control socket: %m"); |
| |
| r = device_monitor_new_full(&manager->monitor, MONITOR_GROUP_KERNEL, fd_uevent); |
| if (r < 0) |
| return log_error_errno(r, "Failed to initialize device monitor: %m"); |
| |
| /* Bump receiver buffer, but only if we are not called via socket activation, as in that |
| * case systemd sets the receive buffer size for us, and the value in the .socket unit |
| * should take full effect. */ |
| if (fd_uevent < 0) { |
| r = sd_device_monitor_set_receive_buffer_size(manager->monitor, 128 * 1024 * 1024); |
| if (r < 0) |
| log_warning_errno(r, "Failed to set receive buffer size for device monitor, ignoring: %m"); |
| } |
| |
| (void) sd_device_monitor_set_description(manager->monitor, "manager"); |
| |
| r = device_monitor_enable_receiving(manager->monitor); |
| if (r < 0) |
| return log_error_errno(r, "Failed to bind netlink socket: %m"); |
| |
| manager->log_level = log_get_max_level(); |
| |
| *ret = TAKE_PTR(manager); |
| |
| return 0; |
| } |
| |
| static int main_loop(Manager *manager) { |
| int fd_worker, r; |
| |
| manager->pid = getpid_cached(); |
| |
| /* unnamed socket from workers to the main daemon */ |
| r = socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch); |
| if (r < 0) |
| return log_error_errno(errno, "Failed to create socketpair for communicating with workers: %m"); |
| |
| fd_worker = manager->worker_watch[READ_END]; |
| |
| r = setsockopt_int(fd_worker, SOL_SOCKET, SO_PASSCRED, true); |
| if (r < 0) |
| return log_error_errno(r, "Failed to enable SO_PASSCRED: %m"); |
| |
| manager->inotify_fd = inotify_init1(IN_CLOEXEC); |
| if (manager->inotify_fd < 0) |
| return log_error_errno(errno, "Failed to create inotify descriptor: %m"); |
| |
| udev_watch_restore(manager->inotify_fd); |
| |
| /* block and listen to all signals on signalfd */ |
| assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0); |
| |
| r = sd_event_default(&manager->event); |
| if (r < 0) |
| return log_error_errno(r, "Failed to allocate event loop: %m"); |
| |
| r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create SIGINT event source: %m"); |
| |
| r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create SIGTERM event source: %m"); |
| |
| r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create SIGHUP event source: %m"); |
| |
| r = sd_event_set_watchdog(manager->event, true); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create watchdog event source: %m"); |
| |
| r = udev_ctrl_attach_event(manager->ctrl, manager->event); |
| if (r < 0) |
| return log_error_errno(r, "Failed to attach event to udev control: %m"); |
| |
| r = udev_ctrl_start(manager->ctrl, on_ctrl_msg, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to start device monitor: %m"); |
| |
| /* This needs to be after the inotify and uevent handling, to make sure |
| * that the ping is send back after fully processing the pending uevents |
| * (including the synthetic ones we may create due to inotify events). |
| */ |
| r = sd_event_source_set_priority(udev_ctrl_get_event_source(manager->ctrl), SD_EVENT_PRIORITY_IDLE); |
| if (r < 0) |
| return log_error_errno(r, "Failed to set IDLE event priority for udev control event source: %m"); |
| |
| r = sd_event_add_io(manager->event, &manager->inotify_event, manager->inotify_fd, EPOLLIN, on_inotify, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create inotify event source: %m"); |
| |
| r = sd_device_monitor_attach_event(manager->monitor, manager->event); |
| if (r < 0) |
| return log_error_errno(r, "Failed to attach event to device monitor: %m"); |
| |
| r = sd_device_monitor_start(manager->monitor, on_uevent, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to start device monitor: %m"); |
| |
| r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create worker event source: %m"); |
| |
| r = sd_event_add_post(manager->event, NULL, on_post, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create post event source: %m"); |
| |
| manager->last_usec = now(CLOCK_MONOTONIC); |
| |
| udev_builtin_init(); |
| |
| r = udev_rules_load(&manager->rules, arg_resolve_name_timing); |
| if (r < 0) |
| return log_error_errno(r, "Failed to read udev rules: %m"); |
| |
| r = udev_rules_apply_static_dev_perms(manager->rules); |
| if (r < 0) |
| log_warning_errno(r, "Failed to apply permissions on static device nodes, ignoring: %m"); |
| |
| notify_ready(); |
| |
| r = sd_event_loop(manager->event); |
| if (r < 0) |
| log_error_errno(r, "Event loop failed: %m"); |
| |
| (void) sd_notify(/* unset= */ false, NOTIFY_STOPPING); |
| return r; |
| } |
| |
| int run_udevd(int argc, char *argv[]) { |
| _cleanup_(manager_freep) Manager *manager = NULL; |
| int fd_ctrl = -EBADF, fd_uevent = -EBADF; |
| int r; |
| |
| log_set_target(LOG_TARGET_AUTO); |
| log_open(); |
| udev_parse_config_full(&arg_children_max, &arg_exec_delay_usec, &arg_event_timeout_usec, &arg_resolve_name_timing, &arg_timeout_signal); |
| log_parse_environment(); |
| log_open(); /* Done again to update after reading configuration. */ |
| |
| r = parse_argv(argc, argv); |
| if (r <= 0) |
| return r; |
| |
| r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX); |
| if (r < 0) |
| log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); |
| |
| if (arg_debug) { |
| log_set_target(LOG_TARGET_CONSOLE); |
| log_set_max_level(LOG_DEBUG); |
| } |
| |
| r = must_be_root(); |
| if (r < 0) |
| return r; |
| |
| if (arg_children_max == 0) { |
| unsigned long cpu_limit, mem_limit, cpu_count = 1; |
| |
| r = cpus_in_affinity_mask(); |
| if (r < 0) |
| log_warning_errno(r, "Failed to determine number of local CPUs, ignoring: %m"); |
| else |
| cpu_count = r; |
| |
| cpu_limit = cpu_count * 2 + 16; |
| mem_limit = MAX(physical_memory() / (128UL*1024*1024), 10U); |
| |
| arg_children_max = MIN(cpu_limit, mem_limit); |
| arg_children_max = MIN(WORKER_NUM_MAX, arg_children_max); |
| |
| log_debug("Set children_max to %u", arg_children_max); |
| } |
| |
| /* set umask before creating any file/directory */ |
| umask(022); |
| |
| r = mac_selinux_init(); |
| if (r < 0) |
| return r; |
| |
| r = RET_NERRNO(mkdir("/run/udev", 0755)); |
| if (r < 0 && r != -EEXIST) |
| return log_error_errno(r, "Failed to create /run/udev: %m"); |
| |
| r = listen_fds(&fd_ctrl, &fd_uevent); |
| if (r < 0) |
| return log_error_errno(r, "Failed to listen on fds: %m"); |
| |
| r = manager_new(&manager, fd_ctrl, fd_uevent); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create manager: %m"); |
| |
| if (arg_daemonize) { |
| pid_t pid; |
| |
| log_info("Starting systemd-udevd version " GIT_VERSION); |
| |
| /* connect /dev/null to stdin, stdout, stderr */ |
| if (log_get_max_level() < LOG_DEBUG) { |
| r = make_null_stdio(); |
| if (r < 0) |
| log_warning_errno(r, "Failed to redirect standard streams to /dev/null: %m"); |
| } |
| |
| pid = fork(); |
| if (pid < 0) |
| return log_error_errno(errno, "Failed to fork daemon: %m"); |
| if (pid > 0) |
| /* parent */ |
| return 0; |
| |
| /* child */ |
| (void) setsid(); |
| } |
| |
| return main_loop(manager); |
| } |
