From 0b4288e3168dee3224c04871528170442305348f Mon Sep 17 00:00:00 2001 From: Luke Shumaker Date: Fri, 21 Oct 2016 14:10:13 -0400 Subject: libcore, nspawn --- src/grp-system/libcore/scope.c | 622 ----------------------------------------- 1 file changed, 622 deletions(-) delete mode 100644 src/grp-system/libcore/scope.c (limited to 'src/grp-system/libcore/scope.c') diff --git a/src/grp-system/libcore/scope.c b/src/grp-system/libcore/scope.c deleted file mode 100644 index aa7d591e66..0000000000 --- a/src/grp-system/libcore/scope.c +++ /dev/null @@ -1,622 +0,0 @@ -/*** - This file is part of systemd. - - Copyright 2013 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see . -***/ - -#include -#include - -#include "systemd-basic/alloc-util.h" -#include "systemd-basic/log.h" -#include "systemd-basic/special.h" -#include "systemd-basic/string-table.h" -#include "systemd-basic/string-util.h" -#include "systemd-basic/strv.h" -#include "systemd-basic/unit-name.h" - -#include "dbus-scope.h" -#include "load-dropin.h" -#include "scope.h" -#include "unit.h" - -static const UnitActiveState state_translation_table[_SCOPE_STATE_MAX] = { - [SCOPE_DEAD] = UNIT_INACTIVE, - [SCOPE_RUNNING] = UNIT_ACTIVE, - [SCOPE_ABANDONED] = UNIT_ACTIVE, - [SCOPE_STOP_SIGTERM] = UNIT_DEACTIVATING, - [SCOPE_STOP_SIGKILL] = UNIT_DEACTIVATING, - [SCOPE_FAILED] = UNIT_FAILED -}; - -static int scope_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); - -static void scope_init(Unit *u) { - Scope *s = SCOPE(u); - - assert(u); - assert(u->load_state == UNIT_STUB); - - s->timeout_stop_usec = u->manager->default_timeout_stop_usec; - u->ignore_on_isolate = true; -} - -static void scope_done(Unit *u) { - Scope *s = SCOPE(u); - - assert(u); - - free(s->controller); - - s->timer_event_source = sd_event_source_unref(s->timer_event_source); -} - -static int scope_arm_timer(Scope *s, usec_t usec) { - int r; - - assert(s); - - if (s->timer_event_source) { - r = sd_event_source_set_time(s->timer_event_source, usec); - if (r < 0) - return r; - - return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); - } - - if (usec == USEC_INFINITY) - return 0; - - r = sd_event_add_time( - UNIT(s)->manager->event, - &s->timer_event_source, - CLOCK_MONOTONIC, - usec, 0, - scope_dispatch_timer, s); - if (r < 0) - return r; - - (void) sd_event_source_set_description(s->timer_event_source, "scope-timer"); - - return 0; -} - -static void scope_set_state(Scope *s, ScopeState state) { - ScopeState old_state; - assert(s); - - old_state = s->state; - s->state = state; - - if (!IN_SET(state, SCOPE_STOP_SIGTERM, SCOPE_STOP_SIGKILL)) - s->timer_event_source = sd_event_source_unref(s->timer_event_source); - - if (IN_SET(state, SCOPE_DEAD, SCOPE_FAILED)) - unit_unwatch_all_pids(UNIT(s)); - - if (state != old_state) - log_debug("%s changed %s -> %s", UNIT(s)->id, scope_state_to_string(old_state), scope_state_to_string(state)); - - unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); -} - -static int scope_add_default_dependencies(Scope *s) { - int r; - - assert(s); - - if (!UNIT(s)->default_dependencies) - return 0; - - /* Make sure scopes are unloaded on shutdown */ - r = unit_add_two_dependencies_by_name( - UNIT(s), - UNIT_BEFORE, UNIT_CONFLICTS, - SPECIAL_SHUTDOWN_TARGET, NULL, true); - if (r < 0) - return r; - - return 0; -} - -static int scope_verify(Scope *s) { - assert(s); - - if (UNIT(s)->load_state != UNIT_LOADED) - return 0; - - if (set_isempty(UNIT(s)->pids) && - !MANAGER_IS_RELOADING(UNIT(s)->manager) && - !unit_has_name(UNIT(s), SPECIAL_INIT_SCOPE)) { - log_unit_error(UNIT(s), "Scope has no PIDs. Refusing."); - return -EINVAL; - } - - return 0; -} - -static int scope_load(Unit *u) { - Scope *s = SCOPE(u); - int r; - - assert(s); - assert(u->load_state == UNIT_STUB); - - if (!u->transient && !MANAGER_IS_RELOADING(u->manager)) - /* Refuse to load non-transient scope units, but allow them while reloading. */ - return -ENOENT; - - r = unit_load_fragment_and_dropin_optional(u); - if (r < 0) - return r; - - if (u->load_state == UNIT_LOADED) { - r = unit_patch_contexts(u); - if (r < 0) - return r; - - r = unit_set_default_slice(u); - if (r < 0) - return r; - - r = scope_add_default_dependencies(s); - if (r < 0) - return r; - } - - return scope_verify(s); -} - -static int scope_coldplug(Unit *u) { - Scope *s = SCOPE(u); - int r; - - assert(s); - assert(s->state == SCOPE_DEAD); - - if (s->deserialized_state == s->state) - return 0; - - if (IN_SET(s->deserialized_state, SCOPE_STOP_SIGKILL, SCOPE_STOP_SIGTERM)) { - r = scope_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_stop_usec)); - if (r < 0) - return r; - } - - if (!IN_SET(s->deserialized_state, SCOPE_DEAD, SCOPE_FAILED)) - unit_watch_all_pids(UNIT(s)); - - scope_set_state(s, s->deserialized_state); - return 0; -} - -static void scope_dump(Unit *u, FILE *f, const char *prefix) { - Scope *s = SCOPE(u); - - assert(s); - assert(f); - - fprintf(f, - "%sScope State: %s\n" - "%sResult: %s\n", - prefix, scope_state_to_string(s->state), - prefix, scope_result_to_string(s->result)); - - cgroup_context_dump(&s->cgroup_context, f, prefix); - kill_context_dump(&s->kill_context, f, prefix); -} - -static void scope_enter_dead(Scope *s, ScopeResult f) { - assert(s); - - if (f != SCOPE_SUCCESS) - s->result = f; - - scope_set_state(s, s->result != SCOPE_SUCCESS ? SCOPE_FAILED : SCOPE_DEAD); -} - -static void scope_enter_signal(Scope *s, ScopeState state, ScopeResult f) { - bool skip_signal = false; - int r; - - assert(s); - - if (f != SCOPE_SUCCESS) - s->result = f; - - unit_watch_all_pids(UNIT(s)); - - /* If we have a controller set let's ask the controller nicely - * to terminate the scope, instead of us going directly into - * SIGTERM berserk mode */ - if (state == SCOPE_STOP_SIGTERM) - skip_signal = bus_scope_send_request_stop(s) > 0; - - if (!skip_signal) { - r = unit_kill_context( - UNIT(s), - &s->kill_context, - state != SCOPE_STOP_SIGTERM ? KILL_KILL : - s->was_abandoned ? KILL_TERMINATE_AND_LOG : - KILL_TERMINATE, - -1, -1, false); - if (r < 0) - goto fail; - } else - r = 1; - - if (r > 0) { - r = scope_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_stop_usec)); - if (r < 0) - goto fail; - - scope_set_state(s, state); - } else if (state == SCOPE_STOP_SIGTERM) - scope_enter_signal(s, SCOPE_STOP_SIGKILL, SCOPE_SUCCESS); - else - scope_enter_dead(s, SCOPE_SUCCESS); - - return; - -fail: - log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m"); - - scope_enter_dead(s, SCOPE_FAILURE_RESOURCES); -} - -static int scope_start(Unit *u) { - Scope *s = SCOPE(u); - int r; - - assert(s); - - if (unit_has_name(u, SPECIAL_INIT_SCOPE)) - return -EPERM; - - if (s->state == SCOPE_FAILED) - return -EPERM; - - /* We can't fulfill this right now, please try again later */ - if (s->state == SCOPE_STOP_SIGTERM || - s->state == SCOPE_STOP_SIGKILL) - return -EAGAIN; - - assert(s->state == SCOPE_DEAD); - - if (!u->transient && !MANAGER_IS_RELOADING(u->manager)) - return -ENOENT; - - (void) unit_realize_cgroup(u); - (void) unit_reset_cpu_usage(u); - - r = unit_attach_pids_to_cgroup(u); - if (r < 0) { - log_unit_warning_errno(UNIT(s), r, "Failed to add PIDs to scope's control group: %m"); - scope_enter_dead(s, SCOPE_FAILURE_RESOURCES); - return r; - } - - s->result = SCOPE_SUCCESS; - - scope_set_state(s, SCOPE_RUNNING); - return 1; -} - -static int scope_stop(Unit *u) { - Scope *s = SCOPE(u); - - assert(s); - - if (s->state == SCOPE_STOP_SIGTERM || - s->state == SCOPE_STOP_SIGKILL) - return 0; - - assert(s->state == SCOPE_RUNNING || - s->state == SCOPE_ABANDONED); - - scope_enter_signal(s, SCOPE_STOP_SIGTERM, SCOPE_SUCCESS); - return 1; -} - -static void scope_reset_failed(Unit *u) { - Scope *s = SCOPE(u); - - assert(s); - - if (s->state == SCOPE_FAILED) - scope_set_state(s, SCOPE_DEAD); - - s->result = SCOPE_SUCCESS; -} - -static int scope_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { - return unit_kill_common(u, who, signo, -1, -1, error); -} - -static int scope_get_timeout(Unit *u, usec_t *timeout) { - Scope *s = SCOPE(u); - usec_t t; - int r; - - if (!s->timer_event_source) - return 0; - - r = sd_event_source_get_time(s->timer_event_source, &t); - if (r < 0) - return r; - if (t == USEC_INFINITY) - return 0; - - *timeout = t; - return 1; -} - -static int scope_serialize(Unit *u, FILE *f, FDSet *fds) { - Scope *s = SCOPE(u); - - assert(s); - assert(f); - assert(fds); - - unit_serialize_item(u, f, "state", scope_state_to_string(s->state)); - unit_serialize_item(u, f, "was-abandoned", yes_no(s->was_abandoned)); - return 0; -} - -static int scope_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { - Scope *s = SCOPE(u); - - assert(u); - assert(key); - assert(value); - assert(fds); - - if (streq(key, "state")) { - ScopeState state; - - state = scope_state_from_string(value); - if (state < 0) - log_unit_debug(u, "Failed to parse state value: %s", value); - else - s->deserialized_state = state; - - } else if (streq(key, "was-abandoned")) { - int k; - - k = parse_boolean(value); - if (k < 0) - log_unit_debug(u, "Failed to parse boolean value: %s", value); - else - s->was_abandoned = k; - } else - log_unit_debug(u, "Unknown serialization key: %s", key); - - return 0; -} - -static bool scope_check_gc(Unit *u) { - assert(u); - - /* Never clean up scopes that still have a process around, - * even if the scope is formally dead. */ - - if (!u->cgroup_path) - return false; - - return cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path) <= 0; -} - -static void scope_notify_cgroup_empty_event(Unit *u) { - Scope *s = SCOPE(u); - assert(u); - - log_unit_debug(u, "cgroup is empty"); - - if (IN_SET(s->state, SCOPE_RUNNING, SCOPE_ABANDONED, SCOPE_STOP_SIGTERM, SCOPE_STOP_SIGKILL)) - scope_enter_dead(s, SCOPE_SUCCESS); -} - -static void scope_sigchld_event(Unit *u, pid_t pid, int code, int status) { - - /* If we get a SIGCHLD event for one of the processes we were - interested in, then we look for others to watch, under the - assumption that we'll sooner or later get a SIGCHLD for - them, as the original process we watched was probably the - parent of them, and they are hence now our children. */ - - unit_tidy_watch_pids(u, 0, 0); - unit_watch_all_pids(u); - - /* If the PID set is empty now, then let's finish this off - (On unified we use proper notifications) */ - if (cg_unified() <= 0 && set_isempty(u->pids)) - scope_notify_cgroup_empty_event(u); -} - -static int scope_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { - Scope *s = SCOPE(userdata); - - assert(s); - assert(s->timer_event_source == source); - - switch (s->state) { - - case SCOPE_STOP_SIGTERM: - if (s->kill_context.send_sigkill) { - log_unit_warning(UNIT(s), "Stopping timed out. Killing."); - scope_enter_signal(s, SCOPE_STOP_SIGKILL, SCOPE_FAILURE_TIMEOUT); - } else { - log_unit_warning(UNIT(s), "Stopping timed out. Skipping SIGKILL."); - scope_enter_dead(s, SCOPE_FAILURE_TIMEOUT); - } - - break; - - case SCOPE_STOP_SIGKILL: - log_unit_warning(UNIT(s), "Still around after SIGKILL. Ignoring."); - scope_enter_dead(s, SCOPE_FAILURE_TIMEOUT); - break; - - default: - assert_not_reached("Timeout at wrong time."); - } - - return 0; -} - -int scope_abandon(Scope *s) { - assert(s); - - if (unit_has_name(UNIT(s), SPECIAL_INIT_SCOPE)) - return -EPERM; - - if (!IN_SET(s->state, SCOPE_RUNNING, SCOPE_ABANDONED)) - return -ESTALE; - - s->was_abandoned = true; - s->controller = mfree(s->controller); - - /* The client is no longer watching the remaining processes, - * so let's step in here, under the assumption that the - * remaining processes will be sooner or later reassigned to - * us as parent. */ - - unit_tidy_watch_pids(UNIT(s), 0, 0); - unit_watch_all_pids(UNIT(s)); - - /* If the PID set is empty now, then let's finish this off */ - if (set_isempty(UNIT(s)->pids)) - scope_notify_cgroup_empty_event(UNIT(s)); - else - scope_set_state(s, SCOPE_ABANDONED); - - return 0; -} - -_pure_ static UnitActiveState scope_active_state(Unit *u) { - assert(u); - - return state_translation_table[SCOPE(u)->state]; -} - -_pure_ static const char *scope_sub_state_to_string(Unit *u) { - assert(u); - - return scope_state_to_string(SCOPE(u)->state); -} - -static void scope_enumerate(Manager *m) { - Unit *u; - int r; - - assert(m); - - /* Let's unconditionally add the "init.scope" special unit - * that encapsulates PID 1. Note that PID 1 already is in the - * cgroup for this, we hence just need to allocate the object - * for it and that's it. */ - - u = manager_get_unit(m, SPECIAL_INIT_SCOPE); - if (!u) { - u = unit_new(m, sizeof(Scope)); - if (!u) { - log_oom(); - return; - } - - r = unit_add_name(u, SPECIAL_INIT_SCOPE); - if (r < 0) { - unit_free(u); - log_error_errno(r, "Failed to add init.scope name"); - return; - } - } - - u->transient = true; - u->default_dependencies = false; - u->no_gc = true; - u->ignore_on_isolate = true; - u->refuse_manual_start = true; - u->refuse_manual_stop = true; - SCOPE(u)->deserialized_state = SCOPE_RUNNING; - SCOPE(u)->kill_context.kill_signal = SIGRTMIN+14; - - /* Prettify things, if we can. */ - if (!u->description) - u->description = strdup("System and Service Manager"); - if (!u->documentation) - (void) strv_extend(&u->documentation, "man:systemd(1)"); - - unit_add_to_load_queue(u); - unit_add_to_dbus_queue(u); -} - -static const char* const scope_result_table[_SCOPE_RESULT_MAX] = { - [SCOPE_SUCCESS] = "success", - [SCOPE_FAILURE_RESOURCES] = "resources", - [SCOPE_FAILURE_TIMEOUT] = "timeout", -}; - -DEFINE_STRING_TABLE_LOOKUP(scope_result, ScopeResult); - -const UnitVTable scope_vtable = { - .object_size = sizeof(Scope), - .cgroup_context_offset = offsetof(Scope, cgroup_context), - .kill_context_offset = offsetof(Scope, kill_context), - - .sections = - "Unit\0" - "Scope\0" - "Install\0", - .private_section = "Scope", - - .can_transient = true, - - .init = scope_init, - .load = scope_load, - .done = scope_done, - - .coldplug = scope_coldplug, - - .dump = scope_dump, - - .start = scope_start, - .stop = scope_stop, - - .kill = scope_kill, - - .get_timeout = scope_get_timeout, - - .serialize = scope_serialize, - .deserialize_item = scope_deserialize_item, - - .active_state = scope_active_state, - .sub_state_to_string = scope_sub_state_to_string, - - .check_gc = scope_check_gc, - - .sigchld_event = scope_sigchld_event, - - .reset_failed = scope_reset_failed, - - .notify_cgroup_empty = scope_notify_cgroup_empty_event, - - .bus_vtable = bus_scope_vtable, - .bus_set_property = bus_scope_set_property, - .bus_commit_properties = bus_scope_commit_properties, - - .enumerate = scope_enumerate, -}; -- cgit v1.2.3-54-g00ecf