+++ /dev/null
-/*-*- 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);
~ianmdlvl / elogind.git / blobdiff