diff options
| author | Lennart Poettering <lennart@poettering.net> | 2010-05-16 18:45:24 +0200 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2010-05-16 18:45:24 +0200 |
| commit | e99e38bbdcca3fe5956823bdb3d38544ccf93221 (patch) | |
| tree | 109871cf2bdcad19105d55f4eea62d5495a8f614 /manager.c | |
| parent | e9da3678fcfc774b325dc1eaa054d0e00028a1fc (diff) | |
build-sys: move source files to subdirectory
Diffstat (limited to 'manager.c')
| -rw-r--r-- | manager.c | 2291 |
1 files changed, 0 insertions, 2291 deletions
diff --git a/manager.c b/manager.c deleted file mode 100644 index 688d9fa65b..0000000000 --- a/manager.c +++ /dev/null @@ -1,2291 +0,0 @@ -/*-*- 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/epoll.h> -#include <signal.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" -#include "missing.h" - -/* 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 (10*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|O_NOCTTY)) < 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"))) - if (!(config_dirs = strv_split(e, ":"))) - goto fail; - - /* We don't treat /etc/xdg/systemd here as the spec - * suggests because we assume that that is a link to - * /etc/systemd/ anyway. */ - - 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/ compatibility 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 -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_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->environment = strv_copy(environ))) - goto fail; - - if (!(m->units = hashmap_new(string_hash_func, string_compare_func))) - goto fail; - - if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func))) - goto fail; - - if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_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; - - if ((r = manager_find_paths(m)) < 0) - goto fail; - - if ((r = manager_setup_signals(m)) < 0) - goto fail; - - if ((r = manager_setup_cgroup(m)) < 0) - goto fail; - - /* Try to connect to the busses, if possible. */ - if ((r = bus_init_system(m)) < 0 || - (r = bus_init_api(m)) < 0) - goto fail; - - *_m = m; - return 0; - -fail: - manager_free(m); - return r; -} - -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 ((j = hashmap_first(m->transaction_jobs))) - job_free(j); - - while ((u = hashmap_first(m->units))) - unit_free(u); -} - -void manager_free(Manager *m) { - UnitType c; - - assert(m); - - manager_dispatch_cleanup_queue(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_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); - strv_free(m->environment); - - free(m->cgroup_controller); - free(m->cgroup_hierarchy); - - hashmap_free(m->cgroup_bondings); - - free(m); -} - -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, delete_dependencies); - - if (!j->installed) - job_free(j); -} - -static void transaction_delete_unit(Manager *m, Unit *u) { - Job *j; - - /* Deletes all jobs associated with a certain unit from the - * transaction */ - - while ((j = hashmap_get(m->transaction_jobs, u))) - 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) { - Job *j; - - assert(m); - - while ((j = hashmap_first(m->transaction_jobs))) - if (j->installed) - transaction_delete_job(m, j, true); - else - job_free(j); - - assert(hashmap_isempty(m->transaction_jobs)); - - transaction_clean_dependencies(m); -} - -static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) { - JobDependency *l; - - assert(m); - - /* A recursive sweep through the graph that marks all units - * that matter to the anchor job, i.e. are directly or - * indirectly a dependency of the anchor job via paths that - * are fully marked as mattering. */ - - if (j) - l = j->subject_list; - else - l = m->transaction_anchor; - - LIST_FOREACH(subject, l, l) { - - /* This link does not matter */ - if (!l->matters) - continue; - - /* This unit has already been marked */ - if (l->object->generation == generation) - continue; - - l->object->matters_to_anchor = true; - l->object->generation = generation; - - transaction_find_jobs_that_matter_to_anchor(m, l->object, generation); - } -} - -static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) { - JobDependency *l, *last; - - assert(j); - assert(other); - assert(j->unit == other->unit); - assert(!j->installed); - - /* Merges 'other' into 'j' and then deletes j. */ - - j->type = t; - j->state = JOB_WAITING; - j->override = j->override || other->override; - - j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor; - - /* Patch us in as new owner of the JobDependency objects */ - last = NULL; - LIST_FOREACH(subject, l, other->subject_list) { - assert(l->subject == other); - l->subject = j; - last = l; - } - - /* Merge both lists */ - if (last) { - last->subject_next = j->subject_list; - if (j->subject_list) - j->subject_list->subject_prev = last; - j->subject_list = other->subject_list; - } - - /* Patch us in as new owner of the JobDependency objects */ - last = NULL; - LIST_FOREACH(object, l, other->object_list) { - assert(l->object == other); - l->object = j; - last = l; - } - - /* Merge both lists */ - if (last) { - last->object_next = j->object_list; - if (j->object_list) - j->object_list->object_prev = last; - j->object_list = other->object_list; - } - - /* Kill the other job */ - other->subject_list = NULL; - other->object_list = NULL; - transaction_delete_job(m, other, true); -} - -static int delete_one_unmergeable_job(Manager *m, Job *j) { - Job *k; - - assert(j); - - /* Tries to delete one item in the linked list - * j->transaction_next->transaction_next->... that conflicts - * whith another one, in an attempt to make an inconsistent - * transaction work. */ - - /* We rely here on the fact that if a merged with b does not - * merge with c, either a or b merge with c neither */ - LIST_FOREACH(transaction, j, j) - LIST_FOREACH(transaction, k, j->transaction_next) { - Job *d; - - /* Is this one mergeable? Then skip it */ - if (job_type_is_mergeable(j->type, k->type)) - continue; - - /* Ok, we found two that conflict, let's see if we can - * drop one of them */ - if (!j->matters_to_anchor) - d = j; - else if (!k->matters_to_anchor) - d = k; - else - return -ENOEXEC; - - /* Ok, we can drop one, so let's do so. */ - 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 -EINVAL; -} - -static int transaction_merge_jobs(Manager *m) { - Job *j; - Iterator i; - int r; - - assert(m); - - /* First step, check whether any of the jobs for one specific - * task conflict. If so, try to drop one of them. */ - HASHMAP_FOREACH(j, m->transaction_jobs, i) { - JobType t; - Job *k; - - t = j->type; - LIST_FOREACH(transaction, k, j->transaction_next) { - if ((r = job_type_merge(&t, k->type)) >= 0) - continue; - - /* OK, we could not merge all jobs for this - * action. Let's see if we can get rid of one - * of them */ - - if ((r = delete_one_unmergeable_job(m, j)) >= 0) - /* Ok, we managed to drop one, now - * let's ask our callers to call us - * again after garbage collecting */ - return -EAGAIN; - - /* We couldn't merge anything. Failure */ - return r; - } - } - - /* Second step, merge the jobs. */ - HASHMAP_FOREACH(j, m->transaction_jobs, i) { - JobType t = j->type; - Job *k; - - /* Merge all transactions */ - LIST_FOREACH(transaction, k, j->transaction_next) - assert_se(job_type_merge(&t, k->type) == 0); - - /* If an active job is mergeable, merge it too */ - if (j->unit->meta.job) - job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */ - - while ((k = j->transaction_next)) { - if (j->installed) { - transaction_merge_and_delete_job(m, k, j, t); - j = k; - } else - transaction_merge_and_delete_job(m, j, k, t); - } - - assert(!j->transaction_next); - assert(!j->transaction_prev); - } - - 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); - - /* Checks whether at least one of the jobs for this unit - * matters to the anchor. */ - - LIST_FOREACH(transaction, j, j) - if (j->matters_to_anchor) - return true; - - return false; -} - -static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation) { - Iterator i; - Unit *u; - int r; - - assert(m); - assert(j); - assert(!j->transaction_prev); - - /* Does a recursive sweep through the ordering graph, looking - * for a cycle. If we find cycle we try to break it. */ - - /* Did we find a cycle? */ - if (j->marker && j->generation == generation) { - Job *k; - - /* So, we already have been here. We have a - * cycle. Let's try to break it. We go backwards in - * our path and try to find a suitable job to - * remove. We use the marker to find our way back, - * 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", k->unit->meta.id, job_type_to_string(k->type)); - transaction_delete_unit(m, k->unit); - return -EAGAIN; - } - - /* Check if this in fact was the beginning of - * the cycle */ - if (k == j) - break; - } - - log_debug("Unable to break cycle"); - - return -ENOEXEC; - } - - /* Make the marker point to where we come from, so that we can - * find our way backwards if we want to break a cycle */ - j->marker = from; - j->generation = generation; - - /* We assume that the the dependencies are bidirectional, and - * hence can ignore UNIT_AFTER */ - SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) { - Job *o; - - /* Is there a job for this unit? */ - if (!(o = hashmap_get(m->transaction_jobs, u))) - - /* Ok, there is no job for this in the - * transaction, but maybe there is already one - * running? */ - if (!(o = u->meta.job)) - continue; - - if ((r = transaction_verify_order_one(m, o, j, generation)) < 0) - return r; - } - - /* Ok, let's backtrack, and remember that this entry is not on - * our path anymore. */ - j->marker = NULL; - - return 0; -} - -static int transaction_verify_order(Manager *m, unsigned *generation) { - Job *j; - int r; - Iterator i; - - assert(m); - assert(generation); - - /* Check if the ordering graph is cyclic. If it is, try to fix - * that up by dropping one of the jobs. */ - - HASHMAP_FOREACH(j, m->transaction_jobs, i) - if ((r = transaction_verify_order_one(m, j, NULL, (*generation)++)) < 0) - return r; - - return 0; -} - -static void transaction_collect_garbage(Manager *m) { - bool again; - - assert(m); - - /* Drop jobs that are not required by any other job */ - - do { - Iterator i; - Job *j; - - again = false; - - HASHMAP_FOREACH(j, m->transaction_jobs, i) { - if (j->object_list) - continue; - - 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) { - Iterator i; - Job *j; - - assert(m); - - /* Checks whether applying this transaction means that - * existing jobs would be replaced */ - - HASHMAP_FOREACH(j, m->transaction_jobs, i) { - - /* Assume merged */ - assert(!j->transaction_prev); - assert(!j->transaction_next); - - if (j->unit->meta.job && - j->unit->meta.job != j && - !job_type_is_superset(j->type, j->unit->meta.job->type)) - return -EEXIST; - } - - return 0; -} - -static void transaction_minimize_impact(Manager *m) { - bool again; - assert(m); - - /* Drops all unnecessary jobs that reverse already active jobs - * or that stop a running service. */ - - do { - Job *j; - Iterator i; - - again = false; - - 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) - continue; - - /* Would this stop a running service? - * Would this change an existing job? - * If so, let's drop this entry */ - - 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.", j->unit->meta.id, job_type_to_string(j->type)); - - transaction_delete_job(m, j, true); - again = true; - break; - } - - if (again) - break; - } - - } while (again); -} - -static int transaction_apply(Manager *m) { - Iterator i; - Job *j; - int r; - - /* Moves the transaction jobs to the set of active jobs */ - - HASHMAP_FOREACH(j, m->transaction_jobs, i) { - /* Assume merged */ - assert(!j->transaction_prev); - assert(!j->transaction_next); - - if (j->installed) - continue; - - if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0) - goto rollback; - } - - while ((j = hashmap_steal_first(m->transaction_jobs))) { - if (j->installed) - continue; - - if (j->unit->meta.job) - job_free(j->unit->meta.job); - - j->unit->meta.job = j; - j->installed = true; - - /* We're fully installed. Now let's free data we don't - * need anymore. */ - - assert(!j->transaction_next); - assert(!j->transaction_prev); - - job_add_to_run_queue(j); - job_add_to_dbus_queue(j); - } - - /* As last step, kill all remaining job dependencies. */ - transaction_clean_dependencies(m); - - return 0; - -rollback: - - HASHMAP_FOREACH(j, m->transaction_jobs, i) { - if (j->installed) - continue; - - hashmap_remove(m->jobs, UINT32_TO_PTR(j->id)); - } - - return r; -} - -static int transaction_activate(Manager *m, JobMode mode) { - int r; - unsigned generation = 1; - - assert(m); - - /* This applies the changes recorded in transaction_jobs to - * the actual list of jobs, if possible. */ - - /* First step: figure out which jobs matter */ - transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++); - - /* Second step: Try not to stop any running services if - * we don't have to. Don't try to reverse running - * jobs if we don't have to. */ - transaction_minimize_impact(m); - - /* Third step: Drop redundant jobs */ - transaction_drop_redundant(m); - - for (;;) { - /* Fourth step: Let's remove unneeded jobs that might - * be lurking. */ - transaction_collect_garbage(m); - - /* 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) { - 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 (;;) { - /* 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) { - log_debug("Requested transaction contains unmergable jobs: %s", strerror(-r)); - goto rollback; - } - - /* Seventh step: an entry got dropped, let's garbage - * collect its dependencies. */ - transaction_collect_garbage(m); - - /* Let's see if the resulting transaction still has - * unmergeable entries ... */ - } - - /* 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)) < 0) { - log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r)); - goto rollback; - } - - /* 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 0; - -rollback: - transaction_abort(m); - return r; -} - -static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool override, bool *is_new) { - Job *j, *f; - int r; - - assert(m); - assert(unit); - - /* Looks for an axisting prospective job and returns that. If - * it doesn't exist it is created and added to the prospective - * jobs list. */ - - f = hashmap_get(m->transaction_jobs, unit); - - LIST_FOREACH(transaction, j, f) { - assert(j->unit == unit); - - if (j->type == type) { - if (is_new) - *is_new = false; - return j; - } - } - - if (unit->meta.job && unit->meta.job->type == type) - j = unit->meta.job; - else if (!(j = job_new(m, type, unit))) - return NULL; - - j->generation = 0; - j->marker = NULL; - j->matters_to_anchor = false; - j->override = override; - - LIST_PREPEND(Job, transaction, f, j); - - if ((r = hashmap_replace(m->transaction_jobs, unit, f)) < 0) { - job_free(j); - return NULL; - } - - 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, bool delete_dependencies) { - assert(m); - assert(j); - - if (j->transaction_prev) - j->transaction_prev->transaction_next = j->transaction_next; - else if (j->transaction_next) - hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next); - else - hashmap_remove_value(m->transaction_jobs, j->unit, j); - - if (j->transaction_next) - j->transaction_next->transaction_prev = j->transaction_prev; - - j->transaction_prev = j->transaction_next = NULL; - - while (j->subject_list) - job_dependency_free(j->subject_list); - - while (j->object_list) { - Job *other = j->object_list->matters ? j->object_list->subject : NULL; - - job_dependency_free(j->object_list); - - if (other && delete_dependencies) { - log_debug("Deleting job %s/%s as dependency of job %s/%s", - 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 override, - Job **_ret) { - Job *ret; - Iterator i; - Unit *dep; - int r; - bool is_new; - - assert(m); - assert(type < _JOB_TYPE_MAX); - assert(unit); - - if (unit->meta.load_state != UNIT_LOADED) - return -EINVAL; - - if (!unit_job_is_applicable(unit, type)) - return -EBADR; - - /* First add the job. */ - if (!(ret = transaction_add_one_job(m, type, unit, override, &is_new))) - return -ENOMEM; - - /* Then, add a link to the job. */ - if (!job_dependency_new(by, ret, matters)) - return -ENOMEM; - - if (is_new) { - /* 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, 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, 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, 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, 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, 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; -} - -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(m); - assert(type < _JOB_TYPE_MAX); - assert(unit); - assert(mode < _JOB_MODE_MAX); - - 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->jobs, UINT32_TO_PTR(id)); -} - -Unit *manager_get_unit(Manager *m, const char *name) { - assert(m); - assert(name); - - return hashmap_get(m->units, name); -} - -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 0; - - m->dispatching_load_queue = true; - - /* Dispatches the load queue. Takes a unit from the queue and - * tries to load its data until the queue is empty */ - - while ((meta = m->load_queue)) { - assert(meta->in_load_queue); - - unit_load(UNIT(meta)); - n++; - } - - m->dispatching_load_queue = false; - return n; -} - -int manager_load_unit_prepare(Manager *m, const char *name, const char *path, Unit **_ret) { - Unit *ret; - int r; - - assert(m); - assert(name || path); - - /* 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); - - if (!unit_name_is_valid(name)) - return -EINVAL; - - if ((ret = manager_get_unit(m, name))) { - *_ret = ret; - return 1; - } - - if (!(ret = unit_new(m))) - return -ENOMEM; - - 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); - return r; - } - - unit_add_to_load_queue(ret); - unit_add_to_dbus_queue(ret); - unit_add_to_gc_queue(ret); - - if (_ret) - *_ret = ret; - - return 0; -} - -int manager_load_unit(Manager *m, const char *name, const char *path, 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); - - return 0; -} - -void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) { - Iterator i; - Job *j; - - assert(s); - assert(f); - - HASHMAP_FOREACH(j, s->jobs, i) - job_dump(j, f, prefix); -} - -void manager_dump_units(Manager *s, FILE *f, const char *prefix) { - Iterator i; - Unit *u; - const char *t; - - assert(s); - assert(f); - - HASHMAP_FOREACH_KEY(u, t, s->units, i) - if (u->meta.id == t) - unit_dump(u, f, prefix); -} - -void manager_clear_jobs(Manager *m) { - Job *j; - - assert(m); - - transaction_abort(m); - - while ((j = hashmap_first(m->jobs))) - job_free(j); -} - -unsigned manager_dispatch_run_queue(Manager *m) { - Job *j; - unsigned n = 0; - - if (m->dispatching_run_queue) - return 0; - - m->dispatching_run_queue = true; - - while ((j = m->run_queue)) { - assert(j->installed); - 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) { - assert(m); - - for (;;) { - siginfo_t si; - Unit *u; - - zero(si); - - /* 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) - 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; - bool sigchld = false; - - assert(m); - - for (;;) { - if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) { - - if (n >= 0) - return -EIO; - - if (errno == EAGAIN) - break; - - return -errno; - } - - 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: { - 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 SIGUSR2: - manager_dump_units(m, stdout, "\t"); - manager_dump_jobs(m, stdout, "\t"); - break; - - case SIGHUP: - m->exit_code = MANAGER_RELOAD; - break; - - default: - log_info("Got unhandled signal <%s>.", strsignal(sfsi.ssi_signo)); - } - } - - if (sigchld) - return manager_dispatch_sigchld(m); - - return 0; -} - -static int process_event(Manager *m, struct epoll_event *ev) { - int r; - Watch *w; - - assert(m); - assert(ev); - - assert(w = ev->data.ptr); - - switch (w->type) { - - case WATCH_SIGNAL: - - /* An incoming signal? */ - if (ev->events != EPOLLIN) - return -EINVAL; - - if ((r = manager_process_signal_fd(m)) < 0) - return r; - - break; - - case WATCH_FD: - - /* 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; - - case WATCH_TIMER: { - uint64_t v; - ssize_t k; - - /* Some timer event, to be dispatched to the units */ - 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->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; - - 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_load_queue(m) > 0) - continue; - - if (manager_dispatch_run_queue(m) > 0) - continue; - - if (bus_dispatch(m) > 0) - continue; - - if (manager_dispatch_cleanup_queue(m) > 0) - continue; - - if (manager_dispatch_gc_queue(m) > 0) - continue; - - 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; - } - - 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); |