/*-*- 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 <sys/signalfd.h>
#include <sys/wait.h>
#include <unistd.h>
+#include <utmpx.h>
#include <sys/poll.h>
+#include <sys/reboot.h>
+#include <sys/ioctl.h>
+#include <linux/kd.h>
+#include <libcgroup.h>
+#include <termios.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
#include "manager.h"
#include "hashmap.h"
#include "macro.h"
#include "strv.h"
#include "log.h"
+#include "util.h"
+#include "ratelimit.h"
+#include "cgroup.h"
+#include "mount-setup.h"
+#include "utmp-wtmp.h"
+#include "unit-name.h"
+#include "dbus-unit.h"
+#include "dbus-job.h"
-Manager* manager_new(void) {
- Manager *m;
+/* As soon as 16 units are in our GC queue, make sure to run a gc sweep */
+#define GC_QUEUE_ENTRIES_MAX 16
+
+/* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */
+#define GC_QUEUE_USEC_MAX (5*USEC_PER_SEC)
+
+static int enable_special_signals(Manager *m) {
+ char fd;
+
+ assert(m);
+
+ /* Enable that we get SIGINT on control-alt-del */
+ if (reboot(RB_DISABLE_CAD) < 0)
+ log_warning("Failed to enable ctrl-alt-del handling: %m");
+
+ if ((fd = open_terminal("/dev/tty0", O_RDWR)) < 0)
+ log_warning("Failed to open /dev/tty0: %m");
+ else {
+ /* Enable that we get SIGWINCH on kbrequest */
+ if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
+ log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
+
+ close_nointr_nofail(fd);
+ }
+
+ return 0;
+}
+
+static int manager_setup_signals(Manager *m) {
sigset_t mask;
struct epoll_event ev;
+ struct sigaction sa;
+
+ assert(m);
+
+ /* We are not interested in SIGSTOP and friends. */
+ zero(sa);
+ sa.sa_handler = SIG_DFL;
+ sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
+ assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
+
+ assert_se(sigemptyset(&mask) == 0);
+ assert_se(sigaddset(&mask, SIGCHLD) == 0);
+ 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, 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, SIGPWR) == 0); /* Some kernel drivers and upsd send us this on power failure */
+ 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;
+
+ if (m->running_as == MANAGER_INIT)
+ return enable_special_signals(m);
+
+ return 0;
+}
+
+static char** session_dirs(void) {
+ const char *home, *e;
+ char *config_home = NULL, *data_home = NULL;
+ char **config_dirs = NULL, **data_dirs = NULL;
+ char **r = NULL, **t;
+
+ /* Implement the mechanisms defined in
+ *
+ * http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
+ *
+ * We look in both the config and the data dirs because we
+ * want to encourage that distributors ship their unit files
+ * as data, and allow overriding as configuration.
+ */
+
+ home = getenv("HOME");
+
+ if ((e = getenv("XDG_CONFIG_HOME"))) {
+ if (asprintf(&config_home, "%s/systemd/session", e) < 0)
+ goto fail;
+
+ } else if (home) {
+ if (asprintf(&config_home, "%s/.config/systemd/session", home) < 0)
+ goto fail;
+ }
+
+ if ((e = getenv("XDG_CONFIG_DIRS")))
+ config_dirs = strv_split(e, ":");
+ else
+ config_dirs = strv_new("/etc/xdg", NULL);
+
+ if (!config_dirs)
+ goto fail;
+
+ if ((e = getenv("XDG_DATA_HOME"))) {
+ if (asprintf(&data_home, "%s/systemd/session", e) < 0)
+ goto fail;
+
+ } else if (home) {
+ if (asprintf(&data_home, "%s/.local/share/systemd/session", home) < 0)
+ goto fail;
+ }
+
+ if ((e = getenv("XDG_DATA_DIRS")))
+ data_dirs = strv_split(e, ":");
+ else
+ data_dirs = strv_new("/usr/local/share", "/usr/share", NULL);
+
+ if (!data_dirs)
+ goto fail;
+
+ /* Now merge everything we found. */
+ if (config_home) {
+ if (!(t = strv_append(r, config_home)))
+ goto fail;
+ strv_free(r);
+ r = t;
+ }
+
+ if (!(t = strv_merge_concat(r, config_dirs, "/systemd/session")))
+ goto finish;
+ strv_free(r);
+ r = t;
+
+ if (!(t = strv_append(r, SESSION_CONFIG_UNIT_PATH)))
+ goto fail;
+ strv_free(r);
+ r = t;
+
+ if (data_home) {
+ if (!(t = strv_append(r, data_home)))
+ goto fail;
+ strv_free(r);
+ r = t;
+ }
+
+ if (!(t = strv_merge_concat(r, data_dirs, "/systemd/session")))
+ goto fail;
+ strv_free(r);
+ r = t;
+
+ if (!(t = strv_append(r, SESSION_DATA_UNIT_PATH)))
+ goto fail;
+ strv_free(r);
+ r = t;
+
+ if (!strv_path_make_absolute_cwd(r))
+ goto fail;
+
+finish:
+ free(config_home);
+ strv_free(config_dirs);
+ free(data_home);
+ strv_free(data_dirs);
+
+ return r;
+
+fail:
+ strv_free(r);
+ r = NULL;
+ goto finish;
+}
+
+static int manager_find_paths(Manager *m) {
+ const char *e;
+ char *t;
+
+ assert(m);
+
+ /* First priority is whatever has been passed to us via env
+ * vars */
+ if ((e = getenv("SYSTEMD_UNIT_PATH")))
+ if (!(m->unit_path = split_path_and_make_absolute(e)))
+ return -ENOMEM;
+
+ if (strv_isempty(m->unit_path)) {
+
+ /* Nothing is set, so let's figure something out. */
+ strv_free(m->unit_path);
+
+ if (m->running_as == MANAGER_SESSION) {
+ if (!(m->unit_path = session_dirs()))
+ return -ENOMEM;
+ } else
+ if (!(m->unit_path = strv_new(
+ SYSTEM_CONFIG_UNIT_PATH, /* /etc/systemd/system/ */
+ SYSTEM_DATA_UNIT_PATH, /* /lib/systemd/system/ */
+ NULL)))
+ return -ENOMEM;
+ }
+
+ if (m->running_as == MANAGER_INIT) {
+ /* /etc/init.d/ compativility does not matter to users */
+
+ if ((e = getenv("SYSTEMD_SYSVINIT_PATH")))
+ if (!(m->sysvinit_path = split_path_and_make_absolute(e)))
+ return -ENOMEM;
+
+ if (strv_isempty(m->sysvinit_path)) {
+ strv_free(m->sysvinit_path);
+
+ if (!(m->sysvinit_path = strv_new(
+ SYSTEM_SYSVINIT_PATH, /* /etc/init.d/ */
+ NULL)))
+ return -ENOMEM;
+ }
+
+ if ((e = getenv("SYSTEMD_SYSVRCND_PATH")))
+ if (!(m->sysvrcnd_path = split_path_and_make_absolute(e)))
+ return -ENOMEM;
+
+ if (strv_isempty(m->sysvrcnd_path)) {
+ strv_free(m->sysvrcnd_path);
+
+ if (!(m->sysvrcnd_path = strv_new(
+ SYSTEM_SYSVRCND_PATH, /* /etc/rcN.d/ */
+ NULL)))
+ return -ENOMEM;
+ }
+ }
+
+ strv_uniq(m->unit_path);
+ strv_uniq(m->sysvinit_path);
+ strv_uniq(m->sysvrcnd_path);
+
+ assert(!strv_isempty(m->unit_path));
+ if (!(t = strv_join(m->unit_path, "\n\t")))
+ return -ENOMEM;
+ log_debug("Looking for unit files in:\n\t%s", t);
+ free(t);
+
+ if (!strv_isempty(m->sysvinit_path)) {
+
+ if (!(t = strv_join(m->sysvinit_path, "\n\t")))
+ return -ENOMEM;
+
+ log_debug("Looking for SysV init scripts in:\n\t%s", t);
+ free(t);
+ } else
+ log_debug("Ignoring SysV init scripts.");
+
+ if (!strv_isempty(m->sysvrcnd_path)) {
+
+ if (!(t = strv_join(m->sysvrcnd_path, "\n\t")))
+ return -ENOMEM;
+
+ log_debug("Looking for SysV rcN.d links in:\n\t%s", t);
+ free(t);
+ } else
+ log_debug("Ignoring SysV rcN.d links.");
+
+ return 0;
+}
+
+int manager_new(ManagerRunningAs running_as, bool confirm_spawn, Manager **_m) {
+ Manager *m;
+ int r = -ENOMEM;
+
+ assert(_m);
+ assert(running_as >= 0);
+ assert(running_as < _MANAGER_RUNNING_AS_MAX);
if (!(m = new0(Manager, 1)))
- return NULL;
+ return -ENOMEM;
+
+ m->boot_timestamp = now(CLOCK_REALTIME);
+
+ m->running_as = running_as;
+ m->confirm_spawn = confirm_spawn;
+ m->name_data_slot = -1;
+ m->exit_code = _MANAGER_EXIT_CODE_INVALID;
- m->signal_fd = m->epoll_fd = -1;
+ m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = m->dev_autofs_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->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func)))
goto fail;
+ if (!(m->cgroup_bondings = hashmap_new(string_hash_func, string_compare_func)))
+ goto fail;
+
+ if (!(m->watch_bus = hashmap_new(string_hash_func, string_compare_func)))
+ goto fail;
+
if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
goto fail;
- assert_se(sigemptyset(&mask) == 0);
- assert_se(sigaddset(&mask, SIGCHLD) == 0);
- assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
+ if ((r = manager_find_paths(m)) < 0)
+ goto fail;
- if ((m->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0)
+ if ((r = manager_setup_signals(m)) < 0)
goto fail;
- zero(ev);
- ev.events = EPOLLIN;
- ev.data.fd = m->signal_fd;
+ if ((r = manager_setup_cgroup(m)) < 0)
+ goto fail;
- if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_fd, &ev) < 0)
+ /* Try to connect to the busses, if possible. */
+ if ((r = bus_init_system(m)) < 0 ||
+ (r = bus_init_api(m)) < 0)
goto fail;
- return m;
+ *_m = m;
+ return 0;
fail:
manager_free(m);
- return NULL;
+ return r;
}
-void manager_free(Manager *m) {
- Unit *u;
+static unsigned manager_dispatch_cleanup_queue(Manager *m) {
+ Meta *meta;
+ unsigned n = 0;
+
+ assert(m);
+
+ while ((meta = m->cleanup_queue)) {
+ assert(meta->in_cleanup_queue);
+
+ unit_free(UNIT(meta));
+ n++;
+ }
+
+ return n;
+}
+
+enum {
+ GC_OFFSET_IN_PATH, /* This one is on the path we were travelling */
+ GC_OFFSET_UNSURE, /* No clue */
+ GC_OFFSET_GOOD, /* We still need this unit */
+ GC_OFFSET_BAD, /* We don't need this unit anymore */
+ _GC_OFFSET_MAX
+};
+
+static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
+ Iterator i;
+ Unit *other;
+ bool is_bad;
+
+ assert(u);
+
+ if (u->meta.gc_marker == gc_marker + GC_OFFSET_GOOD ||
+ u->meta.gc_marker == gc_marker + GC_OFFSET_BAD ||
+ u->meta.gc_marker == gc_marker + GC_OFFSET_IN_PATH)
+ return;
+
+ if (u->meta.in_cleanup_queue)
+ goto bad;
+
+ if (unit_check_gc(u))
+ goto good;
+
+ u->meta.gc_marker = gc_marker + GC_OFFSET_IN_PATH;
+
+ is_bad = true;
+
+ SET_FOREACH(other, u->meta.dependencies[UNIT_REFERENCED_BY], i) {
+ unit_gc_sweep(other, gc_marker);
+
+ if (other->meta.gc_marker == gc_marker + GC_OFFSET_GOOD)
+ goto good;
+
+ if (other->meta.gc_marker != gc_marker + GC_OFFSET_BAD)
+ is_bad = false;
+ }
+
+ if (is_bad)
+ goto bad;
+
+ /* We were unable to find anything out about this entry, so
+ * let's investigate it later */
+ u->meta.gc_marker = gc_marker + GC_OFFSET_UNSURE;
+ unit_add_to_gc_queue(u);
+ return;
+
+bad:
+ /* We definitely know that this one is not useful anymore, so
+ * let's mark it for deletion */
+ u->meta.gc_marker = gc_marker + GC_OFFSET_BAD;
+ unit_add_to_cleanup_queue(u);
+ return;
+
+good:
+ u->meta.gc_marker = gc_marker + GC_OFFSET_GOOD;
+}
+
+static unsigned manager_dispatch_gc_queue(Manager *m) {
+ Meta *meta;
+ unsigned n = 0;
+ unsigned gc_marker;
+
+ assert(m);
+
+ if ((m->n_in_gc_queue < GC_QUEUE_ENTRIES_MAX) &&
+ (m->gc_queue_timestamp <= 0 ||
+ (m->gc_queue_timestamp + GC_QUEUE_USEC_MAX) > now(CLOCK_MONOTONIC)))
+ return 0;
+
+ log_debug("Running GC...");
+
+ m->gc_marker += _GC_OFFSET_MAX;
+ if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
+ m->gc_marker = 1;
+
+ gc_marker = m->gc_marker;
+
+ while ((meta = m->gc_queue)) {
+ assert(meta->in_gc_queue);
+
+ unit_gc_sweep(UNIT(meta), gc_marker);
+
+ LIST_REMOVE(Meta, gc_queue, m->gc_queue, meta);
+ meta->in_gc_queue = false;
+
+ n++;
+
+ if (meta->gc_marker == gc_marker + GC_OFFSET_BAD ||
+ meta->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
+ log_debug("Collecting %s", meta->id);
+ meta->gc_marker = gc_marker + GC_OFFSET_BAD;
+ unit_add_to_cleanup_queue(UNIT(meta));
+ }
+ }
+
+ m->n_in_gc_queue = 0;
+ m->gc_queue_timestamp = 0;
+
+ return n;
+}
+
+static void manager_clear_jobs_and_units(Manager *m) {
Job *j;
+ Unit *u;
assert(m);
while ((u = hashmap_first(m->units)))
unit_free(u);
+}
+
+void manager_free(Manager *m) {
+ UnitType c;
+
+ assert(m);
+
+ manager_clear_jobs_and_units(m);
+
+ for (c = 0; c < _UNIT_TYPE_MAX; c++)
+ if (unit_vtable[c]->shutdown)
+ unit_vtable[c]->shutdown(m);
+
+ /* If we reexecute ourselves, we keep the root cgroup
+ * around */
+ manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
+
+ bus_done_api(m);
+ bus_done_system(m);
hashmap_free(m->units);
hashmap_free(m->jobs);
hashmap_free(m->transaction_jobs);
hashmap_free(m->watch_pids);
+ hashmap_free(m->watch_bus);
if (m->epoll_fd >= 0)
- close_nointr(m->epoll_fd);
- if (m->signal_fd >= 0)
- close_nointr(m->signal_fd);
+ close_nointr_nofail(m->epoll_fd);
+ if (m->signal_watch.fd >= 0)
+ close_nointr_nofail(m->signal_watch.fd);
+
+ strv_free(m->unit_path);
+ strv_free(m->sysvinit_path);
+ strv_free(m->sysvrcnd_path);
+
+ free(m->cgroup_controller);
+ free(m->cgroup_hierarchy);
+
+ hashmap_free(m->cgroup_bondings);
free(m);
}
-static void transaction_delete_job(Manager *m, Job *j) {
+int manager_enumerate(Manager *m) {
+ int r = 0, q;
+ UnitType c;
+
+ assert(m);
+
+ /* 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 ((q = unit_vtable[c]->enumerate(m)) < 0)
+ r = q;
+
+ manager_dispatch_load_queue(m);
+ return r;
+}
+
+int manager_coldplug(Manager *m) {
+ int r = 0, q;
+ Iterator i;
+ Unit *u;
+ char *k;
+
+ assert(m);
+
+ /* Then, let's set up their initial state. */
+ HASHMAP_FOREACH_KEY(u, k, m->units, i) {
+
+ /* ignore aliases */
+ if (u->meta.id != k)
+ continue;
+
+ if (UNIT_VTABLE(u)->coldplug)
+ if ((q = UNIT_VTABLE(u)->coldplug(u)) < 0)
+ r = q;
+ }
+
+ return r;
+}
+
+int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
+ int r, q;
+
+ assert(m);
+
+ /* First, enumerate what we can from all config files */
+ r = manager_enumerate(m);
+
+ /* Second, deserialize if there is something to deserialize */
+ if (serialization)
+ if ((q = manager_deserialize(m, serialization, fds)) < 0)
+ r = q;
+
+ /* Third, fire things up! */
+ if ((q = manager_coldplug(m)) < 0)
+ r = q;
+
+ /* Now that the initial devices are available, let's see if we
+ * can write the utmp file */
+ manager_write_utmp_reboot(m);
+
+ return r;
+}
+
+static void transaction_delete_job(Manager *m, Job *j, bool delete_dependencies) {
assert(m);
assert(j);
/* Deletes one job from the transaction */
- manager_transaction_unlink_job(m, j);
+ manager_transaction_unlink_job(m, j, delete_dependencies);
if (!j->installed)
job_free(j);
* transaction */
while ((j = hashmap_get(m->transaction_jobs, u)))
- transaction_delete_job(m, j);
+ transaction_delete_job(m, j, true);
+}
+
+static void transaction_clean_dependencies(Manager *m) {
+ Iterator i;
+ Job *j;
+
+ assert(m);
+
+ /* Drops all dependencies of all installed jobs */
+
+ HASHMAP_FOREACH(j, m->jobs, i) {
+ while (j->subject_list)
+ job_dependency_free(j->subject_list);
+ while (j->object_list)
+ job_dependency_free(j->object_list);
+ }
+
+ assert(!m->transaction_anchor);
}
static void transaction_abort(Manager *m) {
while ((j = hashmap_first(m->transaction_jobs)))
if (j->installed)
- transaction_delete_job(m, j);
+ transaction_delete_job(m, j, true);
else
job_free(j);
assert(hashmap_isempty(m->transaction_jobs));
- assert(!m->transaction_anchor);
+
+ transaction_clean_dependencies(m);
}
static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) {
j->type = t;
j->state = JOB_WAITING;
- j->forced = j->forced || other->forced;
+ j->override = j->override || other->override;
j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor;
/* Kill the other job */
other->subject_list = NULL;
other->object_list = NULL;
- transaction_delete_job(m, other);
+ transaction_delete_job(m, other, true);
}
static int delete_one_unmergeable_job(Manager *m, Job *j) {
return -ENOEXEC;
/* Ok, we can drop one, so let's do so. */
- log_debug("Try to fix job merging by deleting job %s/%s", unit_id(d->unit), job_type_to_string(d->type));
- transaction_delete_job(m, d);
+ log_debug("Trying to fix job merging by deleting job %s/%s", d->unit->meta.id, job_type_to_string(d->type));
+ transaction_delete_job(m, d, true);
return 0;
}
return 0;
}
+static void transaction_drop_redundant(Manager *m) {
+ bool again;
+
+ assert(m);
+
+ /* Goes through the transaction and removes all jobs that are
+ * a noop */
+
+ do {
+ Job *j;
+ Iterator i;
+
+ again = false;
+
+ HASHMAP_FOREACH(j, m->transaction_jobs, i) {
+ bool changes_something = false;
+ Job *k;
+
+ LIST_FOREACH(transaction, k, j) {
+
+ if (!job_is_anchor(k) &&
+ job_type_is_redundant(k->type, unit_active_state(k->unit)))
+ continue;
+
+ changes_something = true;
+ break;
+ }
+
+ if (changes_something)
+ continue;
+
+ log_debug("Found redundant job %s/%s, dropping.", j->unit->meta.id, job_type_to_string(j->type));
+ transaction_delete_job(m, j, false);
+ again = true;
+ break;
+ }
+
+ } while (again);
+}
+
static bool unit_matters_to_anchor(Unit *u, Job *j) {
assert(u);
assert(!j->transaction_prev);
* since smart how we are we stored our way back in
* there. */
+ log_debug("Found ordering cycle on %s/%s", j->unit->meta.id, 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", k->unit->meta.id, job_type_to_string(k->type));
+
if (!k->installed &&
!unit_matters_to_anchor(k->unit, k)) {
/* Ok, we can drop this one, so let's
* do so. */
- log_debug("Breaking order cycle by deleting job %s/%s", unit_id(k->unit), job_type_to_string(k->type));
+ log_debug("Breaking order cycle by deleting job %s/%s", k->unit->meta.id, job_type_to_string(k->type));
transaction_delete_unit(m, k->unit);
return -EAGAIN;
}
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;
}
if (j->object_list)
continue;
- log_debug("Garbage collecting job %s/%s", unit_id(j->unit), job_type_to_string(j->type));
- transaction_delete_job(m, j);
+ log_debug("Garbage collecting job %s/%s", j->unit->meta.id, job_type_to_string(j->type));
+ transaction_delete_job(m, j, true);
again = true;
break;
}
} while (again);
}
-static int transaction_is_destructive(Manager *m, JobMode mode) {
+static int transaction_is_destructive(Manager *m) {
Iterator i;
Job *j;
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.", j->unit->meta.id, job_type_to_string(j->type));
+
+ if (changes_existing_job)
+ log_debug("%s/%s would change existing job.", j->unit->meta.id, 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));
- transaction_delete_job(m, j);
+ log_debug("Deleting %s/%s to minimize impact.", j->unit->meta.id, job_type_to_string(j->type));
+
+ transaction_delete_job(m, j, true);
again = true;
break;
}
} while (again);
}
-static int transaction_apply(Manager *m, JobMode mode) {
+static int transaction_apply(Manager *m) {
Iterator i;
Job *j;
int r;
assert(!j->transaction_next);
assert(!j->transaction_prev);
- while (j->subject_list)
- job_dependency_free(j->subject_list);
- while (j->object_list)
- job_dependency_free(j->object_list);
+ job_add_to_run_queue(j);
+ job_add_to_dbus_queue(j);
}
- m->transaction_anchor = NULL;
+ /* As last step, kill all remaining job dependencies. */
+ transaction_clean_dependencies(m);
return 0;
* jobs if we don't have to. */
transaction_minimize_impact(m);
+ /* Third step: Drop redundant jobs */
+ transaction_drop_redundant(m);
+
for (;;) {
- /* Third step: Let's remove unneeded jobs that might
+ /* Fourth step: Let's remove unneeded jobs that might
* be lurking. */
transaction_collect_garbage(m);
- /* Fourth step: verify order makes sense and correct
+ /* Fifth step: verify order makes sense and correct
* cycles if necessary and possible */
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... */
}
for (;;) {
- /* Fifth step: let's drop unmergeable entries if
+ /* Sixth step: let's drop unmergeable entries if
* necessary and possible, merge entries we can
* merge */
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
+ /* Seventh step: an entry got dropped, let's garbage
* collect its dependencies. */
transaction_collect_garbage(m);
* unmergeable entries ... */
}
- /* Seventh step: check whether we can actually apply this */
+ /* Eights step: Drop redundant jobs again, if the merging now allows us to drop more. */
+ transaction_drop_redundant(m);
+
+ /* Ninth 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)) < 0) {
+ log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r));
goto rollback;
+ }
- /* Eights step: apply changes */
- if ((r = transaction_apply(m, mode)) < 0)
+ /* Tenth step: apply changes */
+ if ((r = transaction_apply(m)) < 0) {
+ log_debug("Failed to apply transaction: %s", strerror(-r));
goto rollback;
+ }
assert(hashmap_isempty(m->transaction_jobs));
assert(!m->transaction_anchor);
return r;
}
-static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool force, bool *is_new) {
+static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) {
Job *j, *f;
int r;
j->generation = 0;
j->marker = NULL;
j->matters_to_anchor = false;
- j->forced = force;
+ j->override = override;
LIST_PREPEND(Job, transaction, f, j);
if (is_new)
*is_new = true;
+ log_debug("Added job %s/%s to transaction.", unit->meta.id, job_type_to_string(type));
+
return j;
}
-void manager_transaction_unlink_job(Manager *m, Job *j) {
+void manager_transaction_unlink_job(Manager *m, Job *j, bool delete_dependencies) {
assert(m);
assert(j);
job_dependency_free(j->object_list);
- if (other) {
+ if (other && delete_dependencies) {
log_debug("Deleting job %s/%s as dependency of job %s/%s",
- unit_id(other->unit), job_type_to_string(other->type),
- unit_id(j->unit), job_type_to_string(j->type));
- transaction_delete_job(m, other);
+ other->unit->meta.id, job_type_to_string(other->type),
+ j->unit->meta.id, job_type_to_string(j->type));
+ transaction_delete_job(m, other, delete_dependencies);
}
}
}
-static int transaction_add_job_and_dependencies(Manager *m, JobType type, Unit *unit, Job *by, bool matters, bool force, Job **_ret) {
+static int transaction_add_job_and_dependencies(
+ Manager *m,
+ JobType type,
+ Unit *unit,
+ Job *by,
+ bool matters,
+ bool override,
+ Job **_ret) {
Job *ret;
Iterator i;
Unit *dep;
return -EBADR;
/* First add the job. */
- if (!(ret = transaction_add_one_job(m, type, unit, force, &is_new)))
+ if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new)))
return -ENOMEM;
/* Then, add a link to the job. */
/* Finally, recursively add in all dependencies. */
if (type == JOB_START || type == JOB_RELOAD_OR_START) {
SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, force, NULL)) < 0 && r != -EBADR)
- goto fail;
- SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_SOFT_REQUIRES], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !force, force, NULL)) < 0 && r != -EBADR)
+ if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
goto fail;
+
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
+ if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
+ log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
+
SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, force, NULL)) < 0 && r != -EBADR)
- goto fail;
+ if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, false, NULL)) < 0)
+ log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
+
SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, force, NULL)) < 0 && r != -EBADR)
- goto fail;
- SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_SOFT_REQUISITE], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !force, force, NULL)) < 0 && r != -EBADR)
+ if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
goto fail;
+
+ SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
+ if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !override, override, NULL)) < 0 && r != -EBADR)
+ log_warning("Cannot add dependency job for unit %s, ignoring: %s", dep->meta.id, strerror(-r));
+
SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i)
- if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, force, NULL)) < 0 && r != -EBADR)
+ if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
goto fail;
} else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) {
SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i)
- if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, force, NULL)) < 0 && r != -EBADR)
+ if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, override, NULL)) < 0 && r != -EBADR)
goto fail;
}
/* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */
}
+ if (_ret)
+ *_ret = ret;
+
return 0;
fail:
return r;
}
-int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool force, Job **_ret) {
+static int transaction_add_isolate_jobs(Manager *m) {
+ Iterator i;
+ Unit *u;
+ char *k;
+ int r;
+
+ assert(m);
+
+ HASHMAP_FOREACH_KEY(u, k, m->units, i) {
+
+ /* ignore aliases */
+ if (u->meta.id != k)
+ continue;
+
+ if (UNIT_VTABLE(u)->no_isolate)
+ continue;
+
+ /* No need to stop inactive jobs */
+ if (unit_active_state(u) == UNIT_INACTIVE)
+ continue;
+
+ /* Is there already something listed for this? */
+ if (hashmap_get(m->transaction_jobs, u))
+ continue;
+
+ if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, u, NULL, true, false, NULL)) < 0)
+ log_warning("Cannot add isolate job for unit %s, ignoring: %s", u->meta.id, strerror(-r));
+ }
+
+ return 0;
+}
+
+int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, Job **_ret) {
int r;
Job *ret;
assert(unit);
assert(mode < _JOB_MODE_MAX);
- if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, force, &ret))) {
+ if (mode == JOB_ISOLATE && type != JOB_START)
+ return -EINVAL;
+
+ log_debug("Trying to enqueue job %s/%s", unit->meta.id, job_type_to_string(type));
+
+ if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, override, &ret)) < 0) {
transaction_abort(m);
return r;
}
+ if (mode == JOB_ISOLATE)
+ if ((r = transaction_add_isolate_jobs(m)) < 0) {
+ transaction_abort(m);
+ return r;
+ }
+
if ((r = transaction_activate(m, mode)) < 0)
return r;
+ log_debug("Enqueued job %s/%s as %u", unit->meta.id, job_type_to_string(type), (unsigned) ret->id);
+
if (_ret)
*_ret = ret;
return 0;
}
+int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, Job **_ret) {
+ Unit *unit;
+ int r;
+
+ assert(m);
+ assert(type < _JOB_TYPE_MAX);
+ assert(name);
+ assert(mode < _JOB_MODE_MAX);
+
+ if ((r = manager_load_unit(m, name, NULL, &unit)) < 0)
+ return r;
+
+ return manager_add_job(m, type, unit, mode, override, _ret);
+}
+
Job *manager_get_job(Manager *m, uint32_t id) {
assert(m);
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) {
+int manager_load_unit_prepare(Manager *m, const char *name, const char *path, Unit **_ret) {
Unit *ret;
int r;
- const char *name;
assert(m);
- assert(path);
- assert(_ret);
+ assert(name || path);
- /* This will load the service information files, but not actually
- * start any services or anything. */
+ /* This will prepare the unit for loading, but not actually
+ * load anything from disk. */
+
+ if (path && !is_path(path))
+ return -EINVAL;
+
+ if (!name)
+ name = file_name_from_path(path);
- name = file_name_from_path(path);
+ if (!unit_name_is_valid(name))
+ return -EINVAL;
if ((ret = manager_get_unit(m, name))) {
*_ret = ret;
if (!(ret = unit_new(m)))
return -ENOMEM;
- if (is_path(path)) {
- if (!(ret->meta.load_path = strdup(path))) {
+ if (path)
+ if (!(ret->meta.fragment_path = strdup(path))) {
unit_free(ret);
return -ENOMEM;
}
- }
if ((r = unit_add_name(ret, name)) < 0) {
unit_free(ret);
}
unit_add_to_load_queue(ret);
- dispatch_load_queue(m);
+ unit_add_to_dbus_queue(ret);
+
+ if (_ret)
+ *_ret = ret;
+
+ return 0;
+}
+
+int manager_load_unit(Manager *m, const char *name, const char *path, Unit **_ret) {
+ Unit *ret;
+ int r;
+
+ assert(m);
+
+ /* This will load the service information files, but not actually
+ * start any services or anything. */
+
+ if ((r = manager_load_unit_prepare(m, name, path, &ret)) < 0)
+ return r;
+
+ manager_dispatch_load_queue(m);
+
+ if (_ret)
+ *_ret = unit_follow_merge(ret);
- *_ret = ret;
return 0;
}
assert(f);
HASHMAP_FOREACH_KEY(u, t, s->units, i)
- if (unit_id(u) == t)
+ if (u->meta.id == t)
unit_dump(u, f, prefix);
}
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)) {
+ assert(meta->in_dbus_queue);
+
+ bus_unit_send_change_signal(UNIT(meta));
+ 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) {
Unit *u;
zero(si);
- if (waitid(P_ALL, 0, &si, WNOHANG) < 0)
+
+ /* First we call waitd() for a PID and do not reap the
+ * zombie. That way we can still access /proc/$PID for
+ * it while it is a zombie. */
+ if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
+
+ if (errno == ECHILD)
+ break;
+
+ if (errno == EINTR)
+ continue;
+
return -errno;
+ }
- if (si.si_pid == 0)
+ if (si.si_pid <= 0)
break;
+ if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
+ char *name = NULL;
+
+ get_process_name(si.si_pid, &name);
+ log_debug("Got SIGCHLD for process %llu (%s)", (unsigned long long) si.si_pid, strna(name));
+ free(name);
+ }
+
+ /* And now, we actually reap the zombie. */
+ if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
+ if (errno == EINTR)
+ continue;
+
+ return -errno;
+ }
+
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/%s)",
+ (long long unsigned) si.si_pid,
+ sigchld_code_to_string(si.si_code),
+ si.si_status,
+ strna(si.si_code == CLD_EXITED ? exit_status_to_string(si.si_status) : strsignal(si.si_status)));
+
if (!(u = hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid))))
continue;
+ log_debug("Child %llu belongs to %s", (long long unsigned) si.si_pid, u->meta.id);
+
UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status);
}
return 0;
}
+static void manager_start_target(Manager *m, const char *name) {
+ int r;
+
+ if ((r = manager_add_job_by_name(m, JOB_START, name, JOB_REPLACE, true, NULL)) < 0)
+ log_error("Failed to enqueue %s job: %s", name, strerror(-r));
+}
+
static int manager_process_signal_fd(Manager *m) {
ssize_t n;
struct signalfd_siginfo sfsi;
assert(m);
for (;;) {
- if ((n = read(m->signal_fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
+ if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) {
if (n >= 0)
return -EIO;
if (errno == EAGAIN)
- return 0;
+ break;
return -errno;
}
- if (sfsi.ssi_signo == SIGCHLD)
+ switch (sfsi.ssi_signo) {
+
+ case SIGCHLD:
sigchld = true;
+ break;
+
+ case SIGTERM:
+ if (m->running_as == MANAGER_INIT)
+ /* This is for compatibility with the
+ * original sysvinit */
+ m->exit_code = MANAGER_REEXECUTE;
+ else
+ m->exit_code = MANAGER_EXIT;
+
+ return 0;
+
+ case SIGINT:
+ if (m->running_as == MANAGER_INIT) {
+ manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET);
+ break;
+ }
+
+ m->exit_code = MANAGER_EXIT;
+ return 0;
+
+ case SIGWINCH:
+ if (m->running_as == MANAGER_INIT)
+ manager_start_target(m, SPECIAL_KBREQUEST_TARGET);
+
+ /* This is a nop on non-init */
+ break;
+
+ case SIGPWR:
+ if (m->running_as == MANAGER_INIT)
+ manager_start_target(m, SPECIAL_SIGPWR_TARGET);
+
+ /* This is a nop on non-init */
+ break;
+
+ case SIGUSR1:
+ manager_dump_units(m, stdout, "\t");
+ manager_dump_jobs(m, stdout, "\t");
+ break;
+
+ case SIGUSR2: {
+ Unit *u;
+
+ u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
+
+ if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
+ log_info("Trying to reconnect to bus...");
+ bus_init_system(m);
+ bus_init_api(m);
+ }
+
+ if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
+ log_info("Loading D-Bus service...");
+ manager_start_target(m, SPECIAL_DBUS_SERVICE);
+ }
+
+ break;
+ }
+
+ case SIGHUP:
+ m->exit_code = MANAGER_RELOAD;
+ break;
+
+ default:
+ log_info("Got unhandled signal <%s>.", strsignal(sfsi.ssi_signo));
+ }
}
if (sigchld)
static int process_event(Manager *m, struct epoll_event *ev) {
int r;
+ Watch *w;
assert(m);
assert(ev);
- switch (ev->data.u32) {
+ assert(w = ev->data.ptr);
- case MANAGER_SIGNAL:
- assert(ev->data.fd == m->signal_fd);
+ switch (w->type) {
- /* An incoming signal? */
- if (ev->events != POLLIN)
- return -EINVAL;
+ case WATCH_SIGNAL:
- if ((r = manager_process_signal_fd(m)) < 0)
- return -r;
+ /* An incoming signal? */
+ if (ev->events != EPOLLIN)
+ return -EINVAL;
- break;
+ if ((r = manager_process_signal_fd(m)) < 0)
+ return r;
- case MANAGER_FD: {
- Unit *u;
+ break;
- /* Some fd event, to be dispatched to the units */
- assert_se(u = ev->data.ptr);
- UNIT_VTABLE(u)->fd_event(u, ev->data.fd, ev->events);
- break;
- }
+ case WATCH_FD:
- case MANAGER_TIMER: {
- Unit *u;
- uint64_t v;
- ssize_t k;
+ /* Some fd event, to be dispatched to the units */
+ UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
+ break;
- /* Some timer event, to be dispatched to the units */
- if ((k = read(ev->data.fd, &v, sizeof(v))) != sizeof(v)) {
+ case WATCH_TIMER: {
+ uint64_t v;
+ ssize_t k;
- if (k < 0 && (errno == EINTR || errno == EAGAIN))
- break;
+ /* Some timer event, to be dispatched to the units */
+ if ((k = read(w->fd, &v, sizeof(v))) != sizeof(v)) {
- return k < 0 ? -errno : -EIO;
- }
+ if (k < 0 && (errno == EINTR || errno == EAGAIN))
+ break;
- assert_se(u = ev->data.ptr);
- UNIT_VTABLE(u)->timer_event(u, ev->data.fd, v);
- break;
+ return k < 0 ? -errno : -EIO;
}
- default:
- assert_not_reached("Unknown epoll event type.");
+ 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.");
}
return 0;
int manager_loop(Manager *m) {
int r;
+ RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
+
assert(m);
+ m->exit_code = MANAGER_RUNNING;
- for (;;) {
- struct epoll_event events[32];
- int n, i;
+ while (m->exit_code == MANAGER_RUNNING) {
+ 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_cleanup_queue(m) > 0)
+ continue;
+
+ if (manager_dispatch_gc_queue(m) > 0)
+ continue;
+
+ if (manager_dispatch_load_queue(m) > 0)
+ continue;
+
+ if (manager_dispatch_run_queue(m) > 0)
+ continue;
+
+ if (bus_dispatch(m) > 0)
+ continue;
- manager_dispatch_run_queue(m);
+ if (manager_dispatch_dbus_queue(m) > 0)
+ continue;
- if ((n = epoll_wait(m->epoll_fd, events, ELEMENTSOF(events), -1)) < 0) {
+ if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
- if (errno == -EINTR)
+ if (errno == EINTR)
continue;
return -errno;
}
- for (i = 0; i < n; i++)
- if ((r = process_event(m, events + i)) < 0)
- return r;
+ assert(n == 1);
+
+ if ((r = process_event(m, &event)) < 0)
+ return r;
}
+
+ return m->exit_code;
+}
+
+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;
}
+
+static bool manager_utmp_good(Manager *m) {
+ int r;
+
+ assert(m);
+
+ if ((r = mount_path_is_mounted(m, _PATH_UTMPX)) <= 0) {
+
+ if (r < 0)
+ log_warning("Failed to determine whether " _PATH_UTMPX " is mounted: %s", strerror(-r));
+
+ return false;
+ }
+
+ return true;
+}
+
+void manager_write_utmp_reboot(Manager *m) {
+ int r;
+
+ assert(m);
+
+ if (m->utmp_reboot_written)
+ return;
+
+ if (m->running_as != MANAGER_INIT)
+ return;
+
+ if (!manager_utmp_good(m))
+ return;
+
+ if ((r = utmp_put_reboot(m->boot_timestamp)) < 0) {
+
+ if (r != -ENOENT && r != -EROFS)
+ log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
+
+ return;
+ }
+
+ m->utmp_reboot_written = true;
+}
+
+void manager_write_utmp_runlevel(Manager *m, Unit *u) {
+ int runlevel, r;
+
+ assert(m);
+ assert(u);
+
+ if (u->meta.type != UNIT_TARGET)
+ return;
+
+ if (m->running_as != MANAGER_INIT)
+ return;
+
+ if (!manager_utmp_good(m))
+ return;
+
+ if ((runlevel = target_get_runlevel(TARGET(u))) <= 0)
+ return;
+
+ if ((r = utmp_put_runlevel(0, runlevel, 0)) < 0) {
+
+ if (r != -ENOENT && r != -EROFS)
+ log_warning("Failed to write utmp/wtmp: %s", strerror(-r));
+ }
+}
+
+void manager_dispatch_bus_name_owner_changed(
+ Manager *m,
+ const char *name,
+ const char* old_owner,
+ const char *new_owner) {
+
+ Unit *u;
+
+ assert(m);
+ assert(name);
+
+ if (!(u = hashmap_get(m->watch_bus, name)))
+ return;
+
+ UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
+}
+
+void manager_dispatch_bus_query_pid_done(
+ Manager *m,
+ const char *name,
+ pid_t pid) {
+
+ Unit *u;
+
+ assert(m);
+ assert(name);
+ assert(pid >= 1);
+
+ if (!(u = hashmap_get(m->watch_bus, name)))
+ return;
+
+ UNIT_VTABLE(u)->bus_query_pid_done(u, name, pid);
+}
+
+int manager_open_serialization(FILE **_f) {
+ char *path;
+ mode_t saved_umask;
+ int fd;
+ FILE *f;
+
+ assert(_f);
+
+ if (asprintf(&path, "/dev/shm/systemd-%u.dump-XXXXXX", (unsigned) getpid()) < 0)
+ return -ENOMEM;
+
+ saved_umask = umask(0077);
+ fd = mkostemp(path, O_RDWR|O_CLOEXEC);
+ umask(saved_umask);
+
+ if (fd < 0) {
+ free(path);
+ return -errno;
+ }
+
+ unlink(path);
+
+ log_debug("Serializing state to %s", path);
+ free(path);
+
+ if (!(f = fdopen(fd, "w+")) < 0)
+ return -errno;
+
+ *_f = f;
+
+ return 0;
+}
+
+int manager_serialize(Manager *m, FILE *f, FDSet *fds) {
+ Iterator i;
+ Unit *u;
+ const char *t;
+ int r;
+
+ assert(m);
+ assert(f);
+ assert(fds);
+
+ HASHMAP_FOREACH_KEY(u, t, m->units, i) {
+ if (u->meta.id != t)
+ continue;
+
+ if (!unit_can_serialize(u))
+ continue;
+
+ /* Start marker */
+ fputs(u->meta.id, f);
+ fputc('\n', f);
+
+ if ((r = unit_serialize(u, f, fds)) < 0)
+ return r;
+ }
+
+ if (ferror(f))
+ return -EIO;
+
+ return 0;
+}
+
+int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
+ int r = 0;
+
+ assert(m);
+ assert(f);
+
+ log_debug("Deserializing state...");
+
+ for (;;) {
+ Unit *u;
+ char name[UNIT_NAME_MAX+2];
+
+ /* Start marker */
+ if (!fgets(name, sizeof(name), f)) {
+ if (feof(f))
+ break;
+
+ return -errno;
+ }
+
+ char_array_0(name);
+
+ if ((r = manager_load_unit(m, strstrip(name), NULL, &u)) < 0)
+ return r;
+
+ if ((r = unit_deserialize(u, f, fds)) < 0)
+ return r;
+ }
+
+ if (ferror(f))
+ return -EIO;
+
+ return 0;
+}
+
+int manager_reload(Manager *m) {
+ int r, q;
+ FILE *f;
+ FDSet *fds;
+
+ assert(m);
+
+ if ((r = manager_open_serialization(&f)) < 0)
+ return r;
+
+ if (!(fds = fdset_new())) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if ((r = manager_serialize(m, f, fds)) < 0)
+ goto finish;
+
+ if (fseeko(f, 0, SEEK_SET) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ /* From here on there is no way back. */
+ manager_clear_jobs_and_units(m);
+
+ /* First, enumerate what we can from all config files */
+ if ((q = manager_enumerate(m)) < 0)
+ r = q;
+
+ /* Second, deserialize our stored data */
+ if ((q = manager_deserialize(m, f, fds)) < 0)
+ r = q;
+
+ fclose(f);
+ f = NULL;
+
+ /* Third, fire things up! */
+ if ((q = manager_coldplug(m)) < 0)
+ r = q;
+
+finish:
+ if (f)
+ fclose(f);
+
+ if (fds)
+ fdset_free(fds);
+
+ return r;
+}
+
+static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
+ [MANAGER_INIT] = "init",
+ [MANAGER_SYSTEM] = "system",
+ [MANAGER_SESSION] = "session"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);
~ianmdlvl / elogind.git / blobdiff