/*-*- Mode: C; c-basic-offset: 8 -*-*/
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd 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.
+
+ systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
#include <assert.h>
#include <errno.h>
#include <string.h>
#include "strv.h"
#include "log.h"
#include "util.h"
+#include "ratelimit.h"
-Manager* manager_new(void) {
- Manager *m;
+static int manager_setup_signals(Manager *m) {
sigset_t mask;
struct epoll_event ev;
+ assert(m);
+
+ assert_se(reset_all_signal_handlers() == 0);
+
+ assert_se(sigemptyset(&mask) == 0);
+ assert_se(sigaddset(&mask, SIGCHLD) == 0);
+ assert_se(sigaddset(&mask, SIGINT) == 0); /* Kernel sends us this on control-alt-del */
+ assert_se(sigaddset(&mask, SIGWINCH) == 0); /* Kernel sends us this on kbrequest (alt-arrowup) */
+ assert_se(sigaddset(&mask, SIGTERM) == 0);
+ assert_se(sigaddset(&mask, SIGHUP) == 0);
+ assert_se(sigaddset(&mask, SIGUSR1) == 0);
+ assert_se(sigaddset(&mask, SIGUSR2) == 0);
+ assert_se(sigaddset(&mask, SIGPIPE) == 0);
+ assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
+
+ m->signal_watch.type = WATCH_SIGNAL;
+ if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
+ return -errno;
+
+ zero(ev);
+ ev.events = EPOLLIN;
+ ev.data.ptr = &m->signal_watch;
+
+ if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
+ return -errno;
+
+ return 0;
+}
+
+Manager* manager_new(void) {
+ Manager *m;
+
if (!(m = new0(Manager, 1)))
return NULL;
- m->signal_watch.fd = m->epoll_fd = -1;
+ m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = -1;
+ m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
goto fail;
if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
goto fail;
- assert_se(reset_all_signal_handlers() == 0);
-
- assert_se(sigemptyset(&mask) == 0);
- assert_se(sigaddset(&mask, SIGCHLD) == 0);
- assert_se(sigaddset(&mask, SIGINT) == 0);
- assert_se(sigaddset(&mask, SIGTERM) == 0);
- assert_se(sigaddset(&mask, SIGWINCH) == 0);
- assert_se(sigaddset(&mask, SIGHUP) == 0);
- assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
-
- m->signal_watch.type = WATCH_SIGNAL_FD;
- if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
+ if (manager_setup_signals(m) < 0)
goto fail;
- zero(ev);
- ev.events = EPOLLIN;
- ev.data.ptr = &m->signal_watch;
-
- if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
+ /* FIXME: this should be called only when the D-Bus bus daemon is running */
+ if (bus_init(m) < 0)
goto fail;
return m;
}
void manager_free(Manager *m) {
+ UnitType c;
Unit *u;
Job *j;
while ((u = hashmap_first(m->units)))
unit_free(u);
+ for (c = 0; c < _UNIT_TYPE_MAX; c++)
+ if (unit_vtable[c]->shutdown)
+ unit_vtable[c]->shutdown(m);
+
+ bus_done(m);
+
hashmap_free(m->units);
hashmap_free(m->jobs);
hashmap_free(m->transaction_jobs);
free(m);
}
+int manager_coldplug(Manager *m) {
+ int r;
+ UnitType c;
+ Iterator i;
+ Unit *u;
+ char *k;
+
+ assert(m);
+
+ /* First, let's ask every type to load all units from
+ * disk/kernel that it might know */
+ for (c = 0; c < _UNIT_TYPE_MAX; c++)
+ if (unit_vtable[c]->enumerate)
+ if ((r = unit_vtable[c]->enumerate(m)) < 0)
+ return r;
+
+ manager_dispatch_load_queue(m);
+
+ /* Then, let's set up their initial state. */
+ HASHMAP_FOREACH_KEY(u, k, m->units, i) {
+
+ /* ignore aliases */
+ if (unit_id(u) != k)
+ continue;
+
+ if (UNIT_VTABLE(u)->coldplug)
+ if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
+ return r;
+ }
+
+ return 0;
+}
+
static void transaction_delete_job(Manager *m, Job *j) {
assert(m);
assert(j);
* since smart how we are we stored our way back in
* there. */
+ log_debug("Found cycle on %s/%s", unit_id(j->unit), job_type_to_string(j->type));
+
for (k = from; k; k = (k->generation == generation ? k->marker : NULL)) {
+ log_debug("Walked on cycle path to %s/%s", unit_id(j->unit), job_type_to_string(j->type));
+
if (!k->installed &&
!unit_matters_to_anchor(k->unit, k)) {
/* Ok, we can drop this one, so let's
break;
}
+ log_debug("Unable to break cycle");
+
return -ENOEXEC;
}
return r;
}
+ /* Ok, let's backtrack, and remember that this entry is not on
+ * our path anymore. */
+ j->marker = NULL;
+
return 0;
}
HASHMAP_FOREACH(j, m->transaction_jobs, i) {
LIST_FOREACH(transaction, j, j) {
+ bool stops_running_service, changes_existing_job;
/* If it matters, we shouldn't drop it */
if (j->matters_to_anchor)
/* Would this stop a running service?
* Would this change an existing job?
* If so, let's drop this entry */
- if ((j->type != JOB_STOP || UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(j->unit))) &&
- (!j->unit->meta.job || job_type_is_conflicting(j->type, j->unit->meta.job->state)))
+
+ stops_running_service =
+ j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit));
+
+ changes_existing_job =
+ j->unit->meta.job && job_type_is_conflicting(j->type, j->unit->meta.job->state);
+
+ if (!stops_running_service && !changes_existing_job)
continue;
+ if (stops_running_service)
+ log_debug("%s/%s would stop a running service.", unit_id(j->unit), job_type_to_string(j->type));
+
+ if (changes_existing_job)
+ log_debug("%s/%s would change existing job.", unit_id(j->unit), job_type_to_string(j->type));
+
/* Ok, let's get rid of this */
- log_debug("Deleting %s/%s to minimize impact", unit_id(j->unit), job_type_to_string(j->type));
+ log_debug("Deleting %s/%s to minimize impact.", unit_id(j->unit), job_type_to_string(j->type));
+
transaction_delete_job(m, j);
again = true;
break;
assert(!j->transaction_next);
assert(!j->transaction_prev);
- job_schedule_run(j);
+ job_add_to_run_queue(j);
+ job_add_to_dbus_queue(j);
}
/* As last step, kill all remaining job dependencies. */
if ((r = transaction_verify_order(m, &generation)) >= 0)
break;
- if (r != -EAGAIN)
+ if (r != -EAGAIN) {
+ log_debug("Requested transaction contains an unfixable cyclic ordering dependency: %s", strerror(-r));
goto rollback;
+ }
/* Let's see if the resulting transaction ordering
* graph is still cyclic... */
if ((r = transaction_merge_jobs(m)) >= 0)
break;
- if (r != -EAGAIN)
+ if (r != -EAGAIN) {
+ log_debug("Requested transaction contains unmergable jobs: %s", strerror(-r));
goto rollback;
+ }
/* Sixth step: an entry got dropped, let's garbage
* collect its dependencies. */
/* Seventh step: check whether we can actually apply this */
if (mode == JOB_FAIL)
- if ((r = transaction_is_destructive(m, mode)) < 0)
+ if ((r = transaction_is_destructive(m, mode)) < 0) {
+ log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r));
goto rollback;
+ }
/* Eights step: apply changes */
- if ((r = transaction_apply(m, mode)) < 0)
+ if ((r = transaction_apply(m, mode)) < 0) {
+ log_debug("Failed to apply transaction: %s", strerror(-r));
goto rollback;
+ }
assert(hashmap_isempty(m->transaction_jobs));
assert(!m->transaction_anchor);
/* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
}
+ if (_ret)
+ *_ret = ret;
+
return 0;
fail:
assert(unit);
assert(mode < _JOB_MODE_MAX);
- if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, force, &ret))) {
+ log_debug("Trying to enqueue job %s/%s", unit_id(unit), job_type_to_string(type));
+
+ if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, force, &ret)) < 0) {
transaction_abort(m);
return r;
}
if ((r = transaction_activate(m, mode)) < 0)
return r;
+ log_debug("Enqueued job %s/%s as %u", unit_id(unit), job_type_to_string(type), (unsigned) ret->id);
+
if (_ret)
*_ret = ret;
return hashmap_get(m->units, name);
}
-static void dispatch_load_queue(Manager *m) {
+unsigned manager_dispatch_load_queue(Manager *m) {
Meta *meta;
+ unsigned n = 0;
assert(m);
/* Make sure we are not run recursively */
if (m->dispatching_load_queue)
- return;
+ return 0;
m->dispatching_load_queue = true;
assert(meta->in_load_queue);
unit_load(UNIT(meta));
+ n++;
}
m->dispatching_load_queue = false;
+ return n;
}
int manager_load_unit(Manager *m, const char *path, Unit **_ret) {
}
unit_add_to_load_queue(ret);
- dispatch_load_queue(m);
+ unit_add_to_dbus_queue(ret);
+
+ manager_dispatch_load_queue(m);
*_ret = ret;
return 0;
job_free(j);
}
-void manager_dispatch_run_queue(Manager *m) {
+unsigned manager_dispatch_run_queue(Manager *m) {
Job *j;
+ unsigned n = 0;
if (m->dispatching_run_queue)
- return;
+ return 0;
m->dispatching_run_queue = true;
assert(j->in_run_queue);
job_run_and_invalidate(j);
+ n++;
}
m->dispatching_run_queue = false;
+ return n;
+}
+
+unsigned manager_dispatch_dbus_queue(Manager *m) {
+ Job *j;
+ Meta *meta;
+ unsigned n = 0;
+
+ assert(m);
+
+ if (m->dispatching_dbus_queue)
+ return 0;
+
+ m->dispatching_dbus_queue = true;
+
+ while ((meta = m->dbus_unit_queue)) {
+ Unit *u = (Unit*) meta;
+ assert(u->meta.in_dbus_queue);
+
+ bus_unit_send_change_signal(u);
+ n++;
+ }
+
+ while ((j = m->dbus_job_queue)) {
+ assert(j->in_dbus_queue);
+
+ bus_job_send_change_signal(j);
+ n++;
+ }
+
+ m->dispatching_dbus_queue = false;
+ return n;
}
static int manager_dispatch_sigchld(Manager *m) {
if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED)
continue;
- log_debug("child %llu died (code=%s, status=%i)", (long long unsigned) si.si_pid, sigchld_code(si.si_code), si.si_status);
+ log_debug("child %llu died (code=%s, status=%i)", (long long unsigned) si.si_pid, sigchld_code_to_string(si.si_code), si.si_status);
if (!(u = hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid))))
continue;
switch (w->type) {
- case WATCH_SIGNAL_FD:
+ case WATCH_SIGNAL:
/* An incoming signal? */
- if (ev->events != POLLIN)
+ if (ev->events != EPOLLIN)
return -EINVAL;
if ((r = manager_process_signal_fd(m, quit)) < 0)
case WATCH_FD:
/* Some fd event, to be dispatched to the units */
- UNIT_VTABLE(w->unit)->fd_event(w->unit, w->fd, ev->events, w);
+ UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
break;
case WATCH_TIMER: {
ssize_t k;
/* Some timer event, to be dispatched to the units */
- if ((k = read(ev->data.fd, &v, sizeof(v))) != sizeof(v)) {
+ if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
if (k < 0 && (errno == EINTR || errno == EAGAIN))
break;
return k < 0 ? -errno : -EIO;
}
- UNIT_VTABLE(w->unit)->timer_event(w->unit, v, w);
+ UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
break;
}
+ case WATCH_MOUNT:
+ /* Some mount table change, intended for the mount subsystem */
+ mount_fd_event(m, ev->events);
+ break;
+
+ case WATCH_UDEV:
+ /* Some notification from udev, intended for the device subsystem */
+ device_fd_event(m, ev->events);
+ break;
+
+ case WATCH_DBUS_WATCH:
+ bus_watch_event(m, w, ev->events);
+ break;
+
+ case WATCH_DBUS_TIMEOUT:
+ bus_timeout_event(m, w, ev->events);
+ break;
+
default:
assert_not_reached("Unknown epoll event type.");
}
int r;
bool quit = false;
+ RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
+
assert(m);
for (;;) {
- struct epoll_event events[32];
- int n, i;
+ struct epoll_event event;
+ int n;
+
+ if (!ratelimit_test(&rl)) {
+ /* Yay, something is going seriously wrong, pause a little */
+ log_warning("Looping too fast. Throttling execution a little.");
+ sleep(1);
+ }
+
+ if (manager_dispatch_load_queue(m) > 0)
+ continue;
+
+ if (manager_dispatch_run_queue(m) > 0)
+ continue;
- manager_dispatch_run_queue(m);
+ if (bus_dispatch(m) > 0)
+ continue;
- if ((n = epoll_wait(m->epoll_fd, events, ELEMENTSOF(events), -1)) < 0) {
+ if (manager_dispatch_dbus_queue(m) > 0)
+ continue;
+
+ if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
if (errno == -EINTR)
continue;
return -errno;
}
- for (i = 0; i < n; i++) {
- if ((r = process_event(m, events + i, &quit)) < 0)
- return r;
+ assert(n == 1);
- if (quit)
- return 0;
- }
+ if ((r = process_event(m, &event, &quit)) < 0)
+ return r;
+
+ if (quit)
+ return 0;
}
}
+
+int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) {
+ char *n;
+ Unit *u;
+
+ assert(m);
+ assert(s);
+ assert(_u);
+
+ if (!startswith(s, "/org/freedesktop/systemd1/unit/"))
+ return -EINVAL;
+
+ if (!(n = bus_path_unescape(s+31)))
+ return -ENOMEM;
+
+ u = manager_get_unit(m, n);
+ free(n);
+
+ if (!u)
+ return -ENOENT;
+
+ *_u = u;
+
+ return 0;
+}
+
+int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
+ Job *j;
+ unsigned id;
+ int r;
+
+ assert(m);
+ assert(s);
+ assert(_j);
+
+ if (!startswith(s, "/org/freedesktop/systemd1/job/"))
+ return -EINVAL;
+
+ if ((r = safe_atou(s + 30, &id)) < 0)
+ return r;
+
+ if (!(j = manager_get_job(m, id)))
+ return -ENOENT;
+
+ *_j = j;
+
+ return 0;
+}
~ianmdlvl / elogind.git / blobdiff