diff options
Diffstat (limited to 'src/udev/udevd.c')
| -rw-r--r-- | src/udev/udevd.c | 1757 |
1 files changed, 0 insertions, 1757 deletions
diff --git a/src/udev/udevd.c b/src/udev/udevd.c deleted file mode 100644 index badbab6205..0000000000 --- a/src/udev/udevd.c +++ /dev/null @@ -1,1757 +0,0 @@ -/* - * Copyright (C) 2004-2012 Kay Sievers <kay@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 <errno.h> -#include <fcntl.h> -#include <getopt.h> -#include <signal.h> -#include <stdbool.h> -#include <stddef.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.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/socket.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 "cgroup-util.h" -#include "cpu-set-util.h" -#include "dev-setup.h" -#include "fd-util.h" -#include "fileio.h" -#include "formats-util.h" -#include "fs-util.h" -#include "hashmap.h" -#include "io-util.h" -#include "netlink-util.h" -#include "parse-util.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 "terminal-util.h" -#include "udev-util.h" -#include "udev.h" -#include "user-util.h" - -static bool arg_debug = false; -static int arg_daemonize = false; -static int arg_resolve_names = 1; -static unsigned arg_children_max; -static int arg_exec_delay; -static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC; -static usec_t arg_event_timeout_warn_usec = 180 * USEC_PER_SEC / 3; - -typedef struct Manager { - struct udev *udev; - sd_event *event; - Hashmap *workers; - struct udev_list_node events; - const char *cgroup; - pid_t pid; /* the process that originally allocated the manager object */ - - struct udev_rules *rules; - struct udev_list properties; - - struct udev_monitor *monitor; - struct udev_ctrl *ctrl; - struct udev_ctrl_connection *ctrl_conn_blocking; - int fd_inotify; - int worker_watch[2]; - - sd_event_source *ctrl_event; - sd_event_source *uevent_event; - sd_event_source *inotify_event; - - usec_t last_usec; - - bool stop_exec_queue:1; - bool exit:1; -} Manager; - -enum event_state { - EVENT_UNDEF, - EVENT_QUEUED, - EVENT_RUNNING, -}; - -struct event { - struct udev_list_node node; - Manager *manager; - struct udev *udev; - struct udev_device *dev; - struct udev_device *dev_kernel; - struct worker *worker; - enum event_state state; - unsigned long long int delaying_seqnum; - unsigned long long int seqnum; - const char *devpath; - size_t devpath_len; - const char *devpath_old; - dev_t devnum; - int ifindex; - bool is_block; - sd_event_source *timeout_warning; - sd_event_source *timeout; -}; - -static inline struct event *node_to_event(struct udev_list_node *node) { - return container_of(node, struct event, node); -} - -static void event_queue_cleanup(Manager *manager, enum event_state type); - -enum worker_state { - WORKER_UNDEF, - WORKER_RUNNING, - WORKER_IDLE, - WORKER_KILLED, -}; - -struct worker { - Manager *manager; - struct udev_list_node node; - int refcount; - pid_t pid; - struct udev_monitor *monitor; - enum worker_state state; - struct event *event; -}; - -/* passed from worker to main process */ -struct worker_message { -}; - -static void event_free(struct event *event) { - int r; - - if (!event) - return; - - udev_list_node_remove(&event->node); - udev_device_unref(event->dev); - udev_device_unref(event->dev_kernel); - - sd_event_source_unref(event->timeout_warning); - sd_event_source_unref(event->timeout); - - if (event->worker) - event->worker->event = NULL; - - assert(event->manager); - - if (udev_list_node_is_empty(&event->manager->events)) { - /* only clean up the queue from the process that created it */ - if (event->manager->pid == getpid()) { - r = unlink("/run/udev/queue"); - if (r < 0) - log_warning_errno(errno, "could not unlink /run/udev/queue: %m"); - } - } - - free(event); -} - -static void worker_free(struct worker *worker) { - if (!worker) - return; - - assert(worker->manager); - - hashmap_remove(worker->manager->workers, PID_TO_PTR(worker->pid)); - udev_monitor_unref(worker->monitor); - event_free(worker->event); - - free(worker); -} - -static void manager_workers_free(Manager *manager) { - struct worker *worker; - Iterator i; - - assert(manager); - - HASHMAP_FOREACH(worker, manager->workers, i) - worker_free(worker); - - manager->workers = hashmap_free(manager->workers); -} - -static int worker_new(struct worker **ret, Manager *manager, struct udev_monitor *worker_monitor, pid_t pid) { - _cleanup_free_ struct worker *worker = NULL; - int r; - - assert(ret); - assert(manager); - assert(worker_monitor); - assert(pid > 1); - - worker = new0(struct worker, 1); - if (!worker) - return -ENOMEM; - - worker->refcount = 1; - worker->manager = manager; - /* close monitor, but keep address around */ - udev_monitor_disconnect(worker_monitor); - worker->monitor = udev_monitor_ref(worker_monitor); - worker->pid = pid; - - r = hashmap_ensure_allocated(&manager->workers, NULL); - if (r < 0) - return r; - - r = hashmap_put(manager->workers, PID_TO_PTR(pid), worker); - if (r < 0) - return r; - - *ret = worker; - worker = NULL; - - return 0; -} - -static int on_event_timeout(sd_event_source *s, uint64_t usec, void *userdata) { - struct event *event = userdata; - - assert(event); - assert(event->worker); - - kill_and_sigcont(event->worker->pid, SIGKILL); - event->worker->state = WORKER_KILLED; - - log_error("seq %llu '%s' killed", udev_device_get_seqnum(event->dev), event->devpath); - - return 1; -} - -static int on_event_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) { - struct event *event = userdata; - - assert(event); - - log_warning("seq %llu '%s' is taking a long time", udev_device_get_seqnum(event->dev), event->devpath); - - return 1; -} - -static void worker_attach_event(struct worker *worker, struct event *event) { - sd_event *e; - uint64_t usec; - - 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; - - assert_se(sd_event_now(e, clock_boottime_or_monotonic(), &usec) >= 0); - - (void) sd_event_add_time(e, &event->timeout_warning, clock_boottime_or_monotonic(), - usec + arg_event_timeout_warn_usec, USEC_PER_SEC, on_event_timeout_warning, event); - - (void) sd_event_add_time(e, &event->timeout, clock_boottime_or_monotonic(), - usec + arg_event_timeout_usec, USEC_PER_SEC, on_event_timeout, event); -} - -static void manager_free(Manager *manager) { - if (!manager) - return; - - udev_builtin_exit(manager->udev); - - sd_event_source_unref(manager->ctrl_event); - sd_event_source_unref(manager->uevent_event); - sd_event_source_unref(manager->inotify_event); - - udev_unref(manager->udev); - sd_event_unref(manager->event); - manager_workers_free(manager); - event_queue_cleanup(manager, EVENT_UNDEF); - - udev_monitor_unref(manager->monitor); - udev_ctrl_unref(manager->ctrl); - udev_ctrl_connection_unref(manager->ctrl_conn_blocking); - - udev_list_cleanup(&manager->properties); - udev_rules_unref(manager->rules); - - safe_close(manager->fd_inotify); - safe_close_pair(manager->worker_watch); - - free(manager); -} - -DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free); - -static int worker_send_message(int fd) { - struct worker_message message = {}; - - return loop_write(fd, &message, sizeof(message), false); -} - -static void worker_spawn(Manager *manager, struct event *event) { - struct udev *udev = event->udev; - _cleanup_udev_monitor_unref_ struct udev_monitor *worker_monitor = NULL; - pid_t pid; - int r = 0; - - /* listen for new events */ - worker_monitor = udev_monitor_new_from_netlink(udev, NULL); - if (worker_monitor == NULL) - return; - /* allow the main daemon netlink address to send devices to the worker */ - udev_monitor_allow_unicast_sender(worker_monitor, manager->monitor); - r = udev_monitor_enable_receiving(worker_monitor); - if (r < 0) - log_error_errno(r, "worker: could not enable receiving of device: %m"); - - pid = fork(); - switch (pid) { - case 0: { - struct udev_device *dev = NULL; - _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; - int fd_monitor; - _cleanup_close_ int fd_signal = -1, fd_ep = -1; - struct epoll_event ep_signal = { .events = EPOLLIN }; - struct epoll_event ep_monitor = { .events = EPOLLIN }; - sigset_t mask; - - /* take initial device from queue */ - dev = event->dev; - event->dev = NULL; - - unsetenv("NOTIFY_SOCKET"); - - manager_workers_free(manager); - event_queue_cleanup(manager, EVENT_UNDEF); - - manager->monitor = udev_monitor_unref(manager->monitor); - manager->ctrl_conn_blocking = udev_ctrl_connection_unref(manager->ctrl_conn_blocking); - manager->ctrl = udev_ctrl_unref(manager->ctrl); - manager->worker_watch[READ_END] = safe_close(manager->worker_watch[READ_END]); - - manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); - manager->uevent_event = sd_event_source_unref(manager->uevent_event); - manager->inotify_event = sd_event_source_unref(manager->inotify_event); - - manager->event = sd_event_unref(manager->event); - - sigfillset(&mask); - fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); - if (fd_signal < 0) { - r = log_error_errno(errno, "error creating signalfd %m"); - goto out; - } - ep_signal.data.fd = fd_signal; - - fd_monitor = udev_monitor_get_fd(worker_monitor); - ep_monitor.data.fd = fd_monitor; - - fd_ep = epoll_create1(EPOLL_CLOEXEC); - if (fd_ep < 0) { - r = log_error_errno(errno, "error creating epoll fd: %m"); - goto out; - } - - if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 || - epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) { - r = log_error_errno(errno, "fail to add fds to epoll: %m"); - goto out; - } - - /* Request TERM signal if parent exits. - Ignore error, not much we can do in that case. */ - (void) prctl(PR_SET_PDEATHSIG, SIGTERM); - - /* Reset OOM score, we only protect the main daemon. */ - write_string_file("/proc/self/oom_score_adj", "0", 0); - - for (;;) { - struct udev_event *udev_event; - int fd_lock = -1; - - assert(dev); - - log_debug("seq %llu running", udev_device_get_seqnum(dev)); - udev_event = udev_event_new(dev); - if (udev_event == NULL) { - r = -ENOMEM; - goto out; - } - - if (arg_exec_delay > 0) - udev_event->exec_delay = arg_exec_delay; - - /* - * 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. - */ - if (!streq_ptr(udev_device_get_action(dev), "remove") && - streq_ptr("block", udev_device_get_subsystem(dev)) && - !startswith(udev_device_get_sysname(dev), "dm-") && - !startswith(udev_device_get_sysname(dev), "md")) { - struct udev_device *d = dev; - - if (streq_ptr("partition", udev_device_get_devtype(d))) - d = udev_device_get_parent(d); - - if (d) { - fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); - if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) { - log_debug_errno(errno, "Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d)); - fd_lock = safe_close(fd_lock); - goto skip; - } - } - } - - /* needed for renaming netifs */ - udev_event->rtnl = rtnl; - - /* apply rules, create node, symlinks */ - udev_event_execute_rules(udev_event, - arg_event_timeout_usec, arg_event_timeout_warn_usec, - &manager->properties, - manager->rules); - - udev_event_execute_run(udev_event, - arg_event_timeout_usec, arg_event_timeout_warn_usec); - - if (udev_event->rtnl) - /* in case rtnl was initialized */ - rtnl = sd_netlink_ref(udev_event->rtnl); - - /* apply/restore inotify watch */ - if (udev_event->inotify_watch) { - udev_watch_begin(udev, dev); - udev_device_update_db(dev); - } - - safe_close(fd_lock); - - /* send processed event back to libudev listeners */ - udev_monitor_send_device(worker_monitor, NULL, dev); - -skip: - log_debug("seq %llu processed", udev_device_get_seqnum(dev)); - - /* send udevd the result of the event execution */ - r = worker_send_message(manager->worker_watch[WRITE_END]); - if (r < 0) - log_error_errno(r, "failed to send result of seq %llu to main daemon: %m", - udev_device_get_seqnum(dev)); - - udev_device_unref(dev); - dev = NULL; - - udev_event_unref(udev_event); - - /* wait for more device messages from main udevd, or term signal */ - while (dev == NULL) { - struct epoll_event ev[4]; - int fdcount; - int i; - - fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1); - if (fdcount < 0) { - if (errno == EINTR) - continue; - r = log_error_errno(errno, "failed to poll: %m"); - goto out; - } - - for (i = 0; i < fdcount; i++) { - if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) { - dev = udev_monitor_receive_device(worker_monitor); - break; - } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) { - struct signalfd_siginfo fdsi; - ssize_t size; - - size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); - if (size != sizeof(struct signalfd_siginfo)) - continue; - switch (fdsi.ssi_signo) { - case SIGTERM: - goto out; - } - } - } - } - } -out: - udev_device_unref(dev); - manager_free(manager); - log_close(); - _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); - } - case -1: - event->state = EVENT_QUEUED; - log_error_errno(errno, "fork of child failed: %m"); - break; - default: - { - struct worker *worker; - - r = worker_new(&worker, manager, worker_monitor, pid); - if (r < 0) - return; - - worker_attach_event(worker, event); - - log_debug("seq %llu forked new worker ["PID_FMT"]", udev_device_get_seqnum(event->dev), pid); - break; - } - } -} - -static void event_run(Manager *manager, struct event *event) { - struct worker *worker; - Iterator i; - - assert(manager); - assert(event); - - HASHMAP_FOREACH(worker, manager->workers, i) { - ssize_t count; - - if (worker->state != WORKER_IDLE) - continue; - - count = udev_monitor_send_device(manager->monitor, worker->monitor, event->dev); - if (count < 0) { - log_error_errno(errno, "worker ["PID_FMT"] did not accept message %zi (%m), kill it", - worker->pid, count); - kill(worker->pid, SIGKILL); - worker->state = WORKER_KILLED; - continue; - } - worker_attach_event(worker, event); - return; - } - - if (hashmap_size(manager->workers) >= arg_children_max) { - if (arg_children_max > 1) - log_debug("maximum number (%i) of children reached", hashmap_size(manager->workers)); - return; - } - - /* start new worker and pass initial device */ - worker_spawn(manager, event); -} - -static int event_queue_insert(Manager *manager, struct udev_device *dev) { - struct event *event; - int r; - - assert(manager); - assert(dev); - - /* only one process can add events to the queue */ - if (manager->pid == 0) - manager->pid = getpid(); - - assert(manager->pid == getpid()); - - event = new0(struct event, 1); - if (!event) - return -ENOMEM; - - event->udev = udev_device_get_udev(dev); - event->manager = manager; - event->dev = dev; - event->dev_kernel = udev_device_shallow_clone(dev); - udev_device_copy_properties(event->dev_kernel, dev); - event->seqnum = udev_device_get_seqnum(dev); - event->devpath = udev_device_get_devpath(dev); - event->devpath_len = strlen(event->devpath); - event->devpath_old = udev_device_get_devpath_old(dev); - event->devnum = udev_device_get_devnum(dev); - event->is_block = streq("block", udev_device_get_subsystem(dev)); - event->ifindex = udev_device_get_ifindex(dev); - - log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev), - udev_device_get_action(dev), udev_device_get_subsystem(dev)); - - event->state = EVENT_QUEUED; - - if (udev_list_node_is_empty(&manager->events)) { - r = touch("/run/udev/queue"); - if (r < 0) - log_warning_errno(r, "could not touch /run/udev/queue: %m"); - } - - udev_list_node_append(&event->node, &manager->events); - - return 0; -} - -static void manager_kill_workers(Manager *manager) { - struct worker *worker; - Iterator i; - - assert(manager); - - HASHMAP_FOREACH(worker, manager->workers, i) { - if (worker->state == WORKER_KILLED) - continue; - - worker->state = WORKER_KILLED; - kill(worker->pid, SIGTERM); - } -} - -/* lookup event for identical, parent, child device */ -static bool is_devpath_busy(Manager *manager, struct event *event) { - struct udev_list_node *loop; - size_t common; - - /* check if queue contains events we depend on */ - udev_list_node_foreach(loop, &manager->events) { - 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 true; - - /* found ourself, no later event can block us */ - if (loop_event->seqnum >= event->seqnum) - break; - - /* check major/minor */ - if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block) - return true; - - /* check network device ifindex */ - if (event->ifindex != 0 && event->ifindex == loop_event->ifindex) - return true; - - /* check our old name */ - if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) { - event->delaying_seqnum = loop_event->seqnum; - return true; - } - - /* 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) { - /* devices names might have changed/swapped in the meantime */ - if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block)) - continue; - if (event->ifindex != 0 && event->ifindex != loop_event->ifindex) - continue; - event->delaying_seqnum = loop_event->seqnum; - return true; - } - - /* parent device event found */ - if (event->devpath[common] == '/') { - event->delaying_seqnum = loop_event->seqnum; - return true; - } - - /* child device event found */ - if (loop_event->devpath[common] == '/') { - event->delaying_seqnum = loop_event->seqnum; - return true; - } - - /* no matching device */ - continue; - } - - return false; -} - -static int on_exit_timeout(sd_event_source *s, uint64_t usec, void *userdata) { - Manager *manager = userdata; - - assert(manager); - - log_error_errno(ETIMEDOUT, "giving up waiting for workers to finish"); - - sd_event_exit(manager->event, -ETIMEDOUT); - - return 1; -} - -static void manager_exit(Manager *manager) { - uint64_t usec; - int r; - - assert(manager); - - manager->exit = true; - - sd_notify(false, - "STOPPING=1\n" - "STATUS=Starting shutdown..."); - - /* close sources of new events and discard buffered events */ - manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); - manager->ctrl = udev_ctrl_unref(manager->ctrl); - - manager->inotify_event = sd_event_source_unref(manager->inotify_event); - manager->fd_inotify = safe_close(manager->fd_inotify); - - manager->uevent_event = sd_event_source_unref(manager->uevent_event); - manager->monitor = udev_monitor_unref(manager->monitor); - - /* discard queued events and kill workers */ - event_queue_cleanup(manager, EVENT_QUEUED); - manager_kill_workers(manager); - - assert_se(sd_event_now(manager->event, clock_boottime_or_monotonic(), &usec) >= 0); - - r = sd_event_add_time(manager->event, NULL, clock_boottime_or_monotonic(), - usec + 30 * USEC_PER_SEC, USEC_PER_SEC, on_exit_timeout, manager); - if (r < 0) - return; -} - -/* reload requested, HUP signal received, rules changed, builtin changed */ -static void manager_reload(Manager *manager) { - - assert(manager); - - sd_notify(false, - "RELOADING=1\n" - "STATUS=Flushing configuration..."); - - manager_kill_workers(manager); - manager->rules = udev_rules_unref(manager->rules); - udev_builtin_exit(manager->udev); - - sd_notifyf(false, - "READY=1\n" - "STATUS=Processing with %u children at max", arg_children_max); -} - -static void event_queue_start(Manager *manager) { - struct udev_list_node *loop; - usec_t usec; - - assert(manager); - - if (udev_list_node_is_empty(&manager->events) || - manager->exit || manager->stop_exec_queue) - return; - - assert_se(sd_event_now(manager->event, clock_boottime_or_monotonic(), &usec) >= 0); - /* check for changed config, every 3 seconds at most */ - if (manager->last_usec == 0 || - (usec - manager->last_usec) > 3 * USEC_PER_SEC) { - if (udev_rules_check_timestamp(manager->rules) || - udev_builtin_validate(manager->udev)) - manager_reload(manager); - - manager->last_usec = usec; - } - - udev_builtin_init(manager->udev); - - if (!manager->rules) { - manager->rules = udev_rules_new(manager->udev, arg_resolve_names); - if (!manager->rules) - return; - } - - udev_list_node_foreach(loop, &manager->events) { - 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 (is_devpath_busy(manager, event)) - continue; - - event_run(manager, event); - } -} - -static void event_queue_cleanup(Manager *manager, enum event_state match_type) { - struct udev_list_node *loop, *tmp; - - udev_list_node_foreach_safe(loop, tmp, &manager->events) { - struct event *event = node_to_event(loop); - - if (match_type != EVENT_UNDEF && match_type != event->state) - continue; - - event_free(event); - } -} - -static int on_worker(sd_event_source *s, int fd, uint32_t revents, void *userdata) { - Manager *manager = userdata; - - assert(manager); - - for (;;) { - struct worker_message msg; - struct iovec iovec = { - .iov_base = &msg, - .iov_len = sizeof(msg), - }; - union { - struct cmsghdr cmsghdr; - uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; - } control = {}; - struct msghdr msghdr = { - .msg_iov = &iovec, - .msg_iovlen = 1, - .msg_control = &control, - .msg_controllen = sizeof(control), - }; - struct cmsghdr *cmsg; - ssize_t size; - struct ucred *ucred = NULL; - struct worker *worker; - - size = recvmsg(fd, &msghdr, MSG_DONTWAIT); - if (size < 0) { - if (errno == EINTR) - continue; - else if (errno == EAGAIN) - /* nothing more to read */ - break; - - return log_error_errno(errno, "failed to receive message: %m"); - } else if (size != sizeof(struct worker_message)) { - log_warning_errno(EIO, "ignoring worker message with invalid size %zi bytes", size); - continue; - } - - CMSG_FOREACH(cmsg, &msghdr) { - if (cmsg->cmsg_level == SOL_SOCKET && - cmsg->cmsg_type == SCM_CREDENTIALS && - cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) - ucred = (struct ucred*) CMSG_DATA(cmsg); - } - - if (!ucred || ucred->pid <= 0) { - log_warning_errno(EIO, "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_KILLED) - worker->state = WORKER_IDLE; - - /* worker returned */ - event_free(worker->event); - } - - /* we have free workers, try to schedule events */ - event_queue_start(manager); - - return 1; -} - -static int on_uevent(sd_event_source *s, int fd, uint32_t revents, void *userdata) { - Manager *manager = userdata; - struct udev_device *dev; - int r; - - assert(manager); - - dev = udev_monitor_receive_device(manager->monitor); - if (dev) { - udev_device_ensure_usec_initialized(dev, NULL); - r = event_queue_insert(manager, dev); - if (r < 0) - udev_device_unref(dev); - else - /* we have fresh events, try to schedule them */ - event_queue_start(manager); - } - - return 1; -} - -/* receive the udevd message from userspace */ -static int on_ctrl_msg(sd_event_source *s, int fd, uint32_t revents, void *userdata) { - Manager *manager = userdata; - _cleanup_udev_ctrl_connection_unref_ struct udev_ctrl_connection *ctrl_conn = NULL; - _cleanup_udev_ctrl_msg_unref_ struct udev_ctrl_msg *ctrl_msg = NULL; - const char *str; - int i; - - assert(manager); - - ctrl_conn = udev_ctrl_get_connection(manager->ctrl); - if (!ctrl_conn) - return 1; - - ctrl_msg = udev_ctrl_receive_msg(ctrl_conn); - if (!ctrl_msg) - return 1; - - i = udev_ctrl_get_set_log_level(ctrl_msg); - if (i >= 0) { - log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i); - log_set_max_level(i); - manager_kill_workers(manager); - } - - if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) { - log_debug("udevd message (STOP_EXEC_QUEUE) received"); - manager->stop_exec_queue = true; - } - - if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) { - log_debug("udevd message (START_EXEC_QUEUE) received"); - manager->stop_exec_queue = false; - event_queue_start(manager); - } - - if (udev_ctrl_get_reload(ctrl_msg) > 0) { - log_debug("udevd message (RELOAD) received"); - manager_reload(manager); - } - - str = udev_ctrl_get_set_env(ctrl_msg); - if (str != NULL) { - _cleanup_free_ char *key = NULL; - - key = strdup(str); - if (key) { - char *val; - - val = strchr(key, '='); - if (val != NULL) { - val[0] = '\0'; - val = &val[1]; - if (val[0] == '\0') { - log_debug("udevd message (ENV) received, unset '%s'", key); - udev_list_entry_add(&manager->properties, key, NULL); - } else { - log_debug("udevd message (ENV) received, set '%s=%s'", key, val); - udev_list_entry_add(&manager->properties, key, val); - } - } else - log_error("wrong key format '%s'", key); - } - manager_kill_workers(manager); - } - - i = udev_ctrl_get_set_children_max(ctrl_msg); - if (i >= 0) { - log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i); - arg_children_max = i; - - (void) sd_notifyf(false, - "READY=1\n" - "STATUS=Processing with %u children at max", arg_children_max); - } - - if (udev_ctrl_get_ping(ctrl_msg) > 0) - log_debug("udevd message (SYNC) received"); - - if (udev_ctrl_get_exit(ctrl_msg) > 0) { - log_debug("udevd message (EXIT) received"); - manager_exit(manager); - /* keep reference to block the client until we exit - TODO: deal with several blocking exit requests */ - manager->ctrl_conn_blocking = udev_ctrl_connection_ref(ctrl_conn); - } - - return 1; -} - -static int synthesize_change(struct udev_device *dev) { - char filename[UTIL_PATH_SIZE]; - int r; - - if (streq_ptr("block", udev_device_get_subsystem(dev)) && - streq_ptr("disk", udev_device_get_devtype(dev)) && - !startswith(udev_device_get_sysname(dev), "dm-")) { - bool part_table_read = false; - bool has_partitions = false; - int fd; - struct udev *udev = udev_device_get_udev(dev); - _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; - struct udev_list_entry *item; - - /* - * Try to re-read the partition table. This only succeeds if - * none of the devices is busy. The kernel returns 0 if no - * partition table is found, and we will not get an event for - * the disk. - */ - fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); - if (fd >= 0) { - r = flock(fd, LOCK_EX|LOCK_NB); - if (r >= 0) - r = ioctl(fd, BLKRRPART, 0); - - close(fd); - if (r >= 0) - part_table_read = true; - } - - /* search for partitions */ - e = udev_enumerate_new(udev); - if (!e) - return -ENOMEM; - - r = udev_enumerate_add_match_parent(e, dev); - if (r < 0) - return r; - - r = udev_enumerate_add_match_subsystem(e, "block"); - if (r < 0) - return r; - - r = udev_enumerate_scan_devices(e); - if (r < 0) - return r; - - udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) { - _cleanup_udev_device_unref_ struct udev_device *d = NULL; - - d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); - if (!d) - continue; - - if (!streq_ptr("partition", udev_device_get_devtype(d))) - continue; - - has_partitions = true; - break; - } - - /* - * 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 && has_partitions) - return 0; - - /* - * We have partitions but re-reading the partition table did not - * work, synthesize "change" for the disk and all partitions. - */ - log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev)); - strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); - write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); - - udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) { - _cleanup_udev_device_unref_ struct udev_device *d = NULL; - - d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); - if (!d) - continue; - - if (!streq_ptr("partition", udev_device_get_devtype(d))) - continue; - - log_debug("device %s closed, synthesising partition '%s' 'change'", - udev_device_get_devnode(dev), udev_device_get_devnode(d)); - strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL); - write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); - } - - return 0; - } - - log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev)); - strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); - write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); - - return 0; -} - -static int on_inotify(sd_event_source *s, int fd, uint32_t revents, void *userdata) { - Manager *manager = userdata; - union inotify_event_buffer buffer; - struct inotify_event *e; - ssize_t l; - - assert(manager); - - l = read(fd, &buffer, sizeof(buffer)); - if (l < 0) { - if (errno == EAGAIN || errno == EINTR) - return 1; - - return log_error_errno(errno, "Failed to read inotify fd: %m"); - } - - FOREACH_INOTIFY_EVENT(e, buffer, l) { - _cleanup_udev_device_unref_ struct udev_device *dev = NULL; - - dev = udev_watch_lookup(manager->udev, e->wd); - if (!dev) - continue; - - log_debug("inotify event: %x for %s", e->mask, udev_device_get_devnode(dev)); - if (e->mask & IN_CLOSE_WRITE) { - synthesize_change(dev); - - /* settle might be waiting on us to determine the queue - * state. If we just handled an inotify event, we might have - * generated a "change" event, but we won't have queued up - * the resultant uevent yet. Do that. - */ - on_uevent(NULL, -1, 0, manager); - } else if (e->mask & IN_IGNORED) - udev_watch_end(manager->udev, dev); - } - - return 1; -} - -static int on_sigterm(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { - Manager *manager = userdata; - - assert(manager); - - manager_exit(manager); - - return 1; -} - -static int on_sighup(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { - Manager *manager = userdata; - - assert(manager); - - manager_reload(manager); - - return 1; -} - -static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { - Manager *manager = userdata; - - assert(manager); - - for (;;) { - pid_t pid; - int status; - struct worker *worker; - - pid = waitpid(-1, &status, WNOHANG); - if (pid <= 0) - break; - - worker = hashmap_get(manager->workers, PID_TO_PTR(pid)); - if (!worker) { - log_warning("worker ["PID_FMT"] is unknown, ignoring", pid); - continue; - } - - if (WIFEXITED(status)) { - if (WEXITSTATUS(status) == 0) - log_debug("worker ["PID_FMT"] exited", pid); - else - log_warning("worker ["PID_FMT"] exited with return code %i", pid, WEXITSTATUS(status)); - } else if (WIFSIGNALED(status)) { - log_warning("worker ["PID_FMT"] terminated by signal %i (%s)", pid, WTERMSIG(status), strsignal(WTERMSIG(status))); - } else if (WIFSTOPPED(status)) { - log_info("worker ["PID_FMT"] stopped", pid); - continue; - } else if (WIFCONTINUED(status)) { - log_info("worker ["PID_FMT"] continued", pid); - continue; - } else - log_warning("worker ["PID_FMT"] exit with status 0x%04x", pid, status); - - if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { - if (worker->event) { - log_error("worker ["PID_FMT"] failed while handling '%s'", pid, worker->event->devpath); - /* delete state from disk */ - udev_device_delete_db(worker->event->dev); - udev_device_tag_index(worker->event->dev, NULL, false); - /* forward kernel event without amending it */ - udev_monitor_send_device(manager->monitor, NULL, worker->event->dev_kernel); - } - } - - worker_free(worker); - } - - /* we can start new workers, try to schedule events */ - event_queue_start(manager); - - return 1; -} - -static int on_post(sd_event_source *s, void *userdata) { - Manager *manager = userdata; - int r; - - assert(manager); - - if (udev_list_node_is_empty(&manager->events)) { - /* no pending events */ - if (!hashmap_isempty(manager->workers)) { - /* there are idle workers */ - log_debug("cleanup idle workers"); - manager_kill_workers(manager); - } else { - /* we are idle */ - if (manager->exit) { - r = sd_event_exit(manager->event, 0); - if (r < 0) - return r; - } else if (manager->cgroup) - /* cleanup possible left-over processes in our cgroup */ - cg_kill(SYSTEMD_CGROUP_CONTROLLER, manager->cgroup, SIGKILL, CGROUP_IGNORE_SELF, NULL, NULL, NULL); - } - } - - return 1; -} - -static int listen_fds(int *rctrl, int *rnetlink) { - _cleanup_udev_unref_ struct udev *udev = NULL; - int ctrl_fd = -1, netlink_fd = -1; - int fd, n, r; - - assert(rctrl); - assert(rnetlink); - - 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_LOCAL, SOCK_SEQPACKET, -1)) { - if (ctrl_fd >= 0) - return -EINVAL; - ctrl_fd = fd; - continue; - } - - if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) { - if (netlink_fd >= 0) - return -EINVAL; - netlink_fd = fd; - continue; - } - - return -EINVAL; - } - - if (ctrl_fd < 0) { - _cleanup_udev_ctrl_unref_ struct udev_ctrl *ctrl = NULL; - - udev = udev_new(); - if (!udev) - return -ENOMEM; - - ctrl = udev_ctrl_new(udev); - if (!ctrl) - return log_error_errno(EINVAL, "error initializing udev control socket"); - - r = udev_ctrl_enable_receiving(ctrl); - if (r < 0) - return log_error_errno(EINVAL, "error binding udev control socket"); - - fd = udev_ctrl_get_fd(ctrl); - if (fd < 0) - return log_error_errno(EIO, "could not get ctrl fd"); - - ctrl_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); - if (ctrl_fd < 0) - return log_error_errno(errno, "could not dup ctrl fd: %m"); - } - - if (netlink_fd < 0) { - _cleanup_udev_monitor_unref_ struct udev_monitor *monitor = NULL; - - if (!udev) { - udev = udev_new(); - if (!udev) - return -ENOMEM; - } - - monitor = udev_monitor_new_from_netlink(udev, "kernel"); - if (!monitor) - return log_error_errno(EINVAL, "error initializing netlink socket"); - - (void) udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024); - - r = udev_monitor_enable_receiving(monitor); - if (r < 0) - return log_error_errno(EINVAL, "error binding netlink socket"); - - fd = udev_monitor_get_fd(monitor); - if (fd < 0) - return log_error_errno(netlink_fd, "could not get uevent fd: %m"); - - netlink_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); - if (ctrl_fd < 0) - return log_error_errno(errno, "could not dup netlink fd: %m"); - } - - *rctrl = ctrl_fd; - *rnetlink = netlink_fd; - - return 0; -} - -/* - * read the kernel command line, in case we need to get into debug mode - * udev.log-priority=<level> syslog priority - * udev.children-max=<number of workers> events are fully serialized if set to 1 - * 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 - */ -static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { - int r = 0; - - assert(key); - - if (!value) - return 0; - - if (streq(key, "udev.log-priority") && value) { - r = util_log_priority(value); - if (r >= 0) - log_set_max_level(r); - } else if (streq(key, "udev.event-timeout") && value) { - r = safe_atou64(value, &arg_event_timeout_usec); - if (r >= 0) { - arg_event_timeout_usec *= USEC_PER_SEC; - arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; - } - } else if (streq(key, "udev.children-max") && value) - r = safe_atou(value, &arg_children_max); - else if (streq(key, "udev.exec-delay") && value) - r = safe_atoi(value, &arg_exec_delay); - else if (startswith(key, "udev.")) - log_warning("Unknown udev kernel command line option \"%s\"", key); - - if (r < 0) - log_warning_errno(r, "Failed to parse \"%s=%s\", ignoring: %m", key, value); - return 0; -} - -static void help(void) { - printf("%s [OPTIONS...]\n\n" - "Manages devices.\n\n" - " -h --help Print this message\n" - " --version Print version of the program\n" - " --daemon Detach and run in the background\n" - " --debug Enable debug output\n" - " --children-max=INT Set maximum number of workers\n" - " --exec-delay=SECONDS Seconds to wait before executing RUN=\n" - " --event-timeout=SECONDS Seconds to wait before terminating an event\n" - " --resolve-names=early|late|never\n" - " When to resolve users and groups\n" - , program_invocation_short_name); -} - -static int parse_argv(int argc, char *argv[]) { - 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' }, - {} - }; - - int c; - - assert(argc >= 0); - assert(argv); - - while ((c = getopt_long(argc, argv, "c:de:Dt:N:hV", options, NULL)) >= 0) { - int r; - - switch (c) { - - case 'd': - arg_daemonize = true; - break; - case 'c': - r = safe_atou(optarg, &arg_children_max); - if (r < 0) - log_warning("Invalid --children-max ignored: %s", optarg); - break; - case 'e': - r = safe_atoi(optarg, &arg_exec_delay); - if (r < 0) - log_warning("Invalid --exec-delay ignored: %s", optarg); - break; - case 't': - r = safe_atou64(optarg, &arg_event_timeout_usec); - if (r < 0) - log_warning("Invalid --event-timeout ignored: %s", optarg); - else { - arg_event_timeout_usec *= USEC_PER_SEC; - arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; - } - break; - case 'D': - arg_debug = true; - break; - case 'N': - if (streq(optarg, "early")) { - arg_resolve_names = 1; - } else if (streq(optarg, "late")) { - arg_resolve_names = 0; - } else if (streq(optarg, "never")) { - arg_resolve_names = -1; - } else { - log_error("resolve-names must be early, late or never"); - return 0; - } - break; - case 'h': - help(); - return 0; - case 'V': - printf("%s\n", VERSION); - return 0; - case '?': - return -EINVAL; - default: - assert_not_reached("Unhandled option"); - - } - } - - return 1; -} - -static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent, const char *cgroup) { - _cleanup_(manager_freep) Manager *manager = NULL; - int r, fd_worker, one = 1; - - assert(ret); - assert(fd_ctrl >= 0); - assert(fd_uevent >= 0); - - manager = new0(Manager, 1); - if (!manager) - return log_oom(); - - manager->fd_inotify = -1; - manager->worker_watch[WRITE_END] = -1; - manager->worker_watch[READ_END] = -1; - - manager->udev = udev_new(); - if (!manager->udev) - return log_error_errno(errno, "could not allocate udev context: %m"); - - udev_builtin_init(manager->udev); - - manager->rules = udev_rules_new(manager->udev, arg_resolve_names); - if (!manager->rules) - return log_error_errno(ENOMEM, "error reading rules"); - - udev_list_node_init(&manager->events); - udev_list_init(manager->udev, &manager->properties, true); - - manager->cgroup = cgroup; - - manager->ctrl = udev_ctrl_new_from_fd(manager->udev, fd_ctrl); - if (!manager->ctrl) - return log_error_errno(EINVAL, "error taking over udev control socket"); - - manager->monitor = udev_monitor_new_from_netlink_fd(manager->udev, "kernel", fd_uevent); - if (!manager->monitor) - return log_error_errno(EINVAL, "error taking over netlink socket"); - - /* unnamed socket from workers to the main daemon */ - r = socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch); - if (r < 0) - return log_error_errno(errno, "error creating socketpair: %m"); - - fd_worker = manager->worker_watch[READ_END]; - - r = setsockopt(fd_worker, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); - if (r < 0) - return log_error_errno(errno, "could not enable SO_PASSCRED: %m"); - - manager->fd_inotify = udev_watch_init(manager->udev); - if (manager->fd_inotify < 0) - return log_error_errno(ENOMEM, "error initializing inotify"); - - udev_watch_restore(manager->udev); - - /* 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, "could not allocate event loop: %m"); - - r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager); - if (r < 0) - return log_error_errno(r, "error creating sigint event source: %m"); - - r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager); - if (r < 0) - return log_error_errno(r, "error creating sigterm event source: %m"); - - r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager); - if (r < 0) - return log_error_errno(r, "error creating sighup event source: %m"); - - r = sd_event_add_signal(manager->event, NULL, SIGCHLD, on_sigchld, manager); - if (r < 0) - return log_error_errno(r, "error creating sigchld event source: %m"); - - r = sd_event_set_watchdog(manager->event, true); - if (r < 0) - return log_error_errno(r, "error creating watchdog event source: %m"); - - r = sd_event_add_io(manager->event, &manager->ctrl_event, fd_ctrl, EPOLLIN, on_ctrl_msg, manager); - if (r < 0) - return log_error_errno(r, "error creating ctrl event source: %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(manager->ctrl_event, SD_EVENT_PRIORITY_IDLE); - if (r < 0) - return log_error_errno(r, "cold not set IDLE event priority for ctrl event source: %m"); - - r = sd_event_add_io(manager->event, &manager->inotify_event, manager->fd_inotify, EPOLLIN, on_inotify, manager); - if (r < 0) - return log_error_errno(r, "error creating inotify event source: %m"); - - r = sd_event_add_io(manager->event, &manager->uevent_event, fd_uevent, EPOLLIN, on_uevent, manager); - if (r < 0) - return log_error_errno(r, "error creating uevent event source: %m"); - - r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager); - if (r < 0) - return log_error_errno(r, "error creating worker event source: %m"); - - r = sd_event_add_post(manager->event, NULL, on_post, manager); - if (r < 0) - return log_error_errno(r, "error creating post event source: %m"); - - *ret = manager; - manager = NULL; - - return 0; -} - -static int run(int fd_ctrl, int fd_uevent, const char *cgroup) { - _cleanup_(manager_freep) Manager *manager = NULL; - int r; - - r = manager_new(&manager, fd_ctrl, fd_uevent, cgroup); - if (r < 0) { - r = log_error_errno(r, "failed to allocate manager object: %m"); - goto exit; - } - - r = udev_rules_apply_static_dev_perms(manager->rules); - if (r < 0) - log_error_errno(r, "failed to apply permissions on static device nodes: %m"); - - (void) sd_notifyf(false, - "READY=1\n" - "STATUS=Processing with %u children at max", arg_children_max); - - r = sd_event_loop(manager->event); - if (r < 0) { - log_error_errno(r, "event loop failed: %m"); - goto exit; - } - - sd_event_get_exit_code(manager->event, &r); - -exit: - sd_notify(false, - "STOPPING=1\n" - "STATUS=Shutting down..."); - if (manager) - udev_ctrl_cleanup(manager->ctrl); - return r; -} - -int main(int argc, char *argv[]) { - _cleanup_free_ char *cgroup = NULL; - int fd_ctrl = -1, fd_uevent = -1; - int r; - - log_set_target(LOG_TARGET_AUTO); - log_parse_environment(); - log_open(); - - r = parse_argv(argc, argv); - if (r <= 0) - goto exit; - - r = parse_proc_cmdline(parse_proc_cmdline_item, NULL, true); - 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); - } - - if (getuid() != 0) { - r = log_error_errno(EPERM, "root privileges required"); - goto exit; - } - - if (arg_children_max == 0) { - cpu_set_t cpu_set; - - arg_children_max = 8; - - if (sched_getaffinity(0, sizeof(cpu_set), &cpu_set) == 0) - arg_children_max += CPU_COUNT(&cpu_set) * 2; - - log_debug("set children_max to %u", arg_children_max); - } - - /* set umask before creating any file/directory */ - r = chdir("/"); - if (r < 0) { - r = log_error_errno(errno, "could not change dir to /: %m"); - goto exit; - } - - umask(022); - - r = mac_selinux_init(); - if (r < 0) { - log_error_errno(r, "could not initialize labelling: %m"); - goto exit; - } - - r = mkdir("/run/udev", 0755); - if (r < 0 && errno != EEXIST) { - r = log_error_errno(errno, "could not create /run/udev: %m"); - goto exit; - } - - dev_setup(NULL, UID_INVALID, GID_INVALID); - - if (getppid() == 1) { - /* 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 (r == -ENOENT || r == -ENOMEDIUM) - log_debug_errno(r, "did not find dedicated cgroup: %m"); - else - log_warning_errno(r, "failed to get cgroup: %m"); - } - } - - r = listen_fds(&fd_ctrl, &fd_uevent); - if (r < 0) { - r = log_error_errno(r, "could not listen on fds: %m"); - goto exit; - } - - if (arg_daemonize) { - pid_t pid; - - log_info("starting version " 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(); - switch (pid) { - case 0: - break; - case -1: - r = log_error_errno(errno, "fork of daemon failed: %m"); - goto exit; - default: - mac_selinux_finish(); - log_close(); - _exit(EXIT_SUCCESS); - } - - setsid(); - - write_string_file("/proc/self/oom_score_adj", "-1000", 0); - } - - r = run(fd_ctrl, fd_uevent, cgroup); - -exit: - mac_selinux_finish(); - log_close(); - return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; -} |