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ce30c8dcb4
systemd/src/core/busname.c
Lennart Poettering ce30c8dcb4 tree-wide: whenever we fork off a foreign child process reset signal mask/handlers 
Also, when the child is potentially long-running make sure to set a
death signal.

Also, ignore the result of the reset operations explicitly by casting
them to (void).
2015-06-10 01:28:58 +02:00

1078 lines
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
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 <http://www.gnu.org/licenses/>.
***/
#include <sys/mman.h>
#include "special.h"
#include "formats-util.h"
#include "signal-util.h"
#include "bus-kernel.h"
#include "bus-internal.h"
#include "bus-util.h"
#include "kdbus.h"
#include "bus-policy.h"
#include "service.h"
#include "dbus-busname.h"
#include "busname.h"
static const UnitActiveState state_translation_table[_BUSNAME_STATE_MAX] = {
[BUSNAME_DEAD] = UNIT_INACTIVE,
[BUSNAME_MAKING] = UNIT_ACTIVATING,
[BUSNAME_REGISTERED] = UNIT_ACTIVE,
[BUSNAME_LISTENING] = UNIT_ACTIVE,
[BUSNAME_RUNNING] = UNIT_ACTIVE,
[BUSNAME_SIGTERM] = UNIT_DEACTIVATING,
[BUSNAME_SIGKILL] = UNIT_DEACTIVATING,
[BUSNAME_FAILED] = UNIT_FAILED
};
static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
static void busname_init(Unit *u) {
BusName *n = BUSNAME(u);
assert(u);
assert(u->load_state == UNIT_STUB);
n->starter_fd = -1;
n->accept_fd = true;
n->activating = true;
n->timeout_usec = u->manager->default_timeout_start_usec;
}
static void busname_unwatch_control_pid(BusName *n) {
assert(n);
if (n->control_pid <= 0)
return;
unit_unwatch_pid(UNIT(n), n->control_pid);
n->control_pid = 0;
}
static void busname_free_policy(BusName *n) {
BusNamePolicy *p;
assert(n);
while ((p = n->policy)) {
LIST_REMOVE(policy, n->policy, p);
free(p->name);
free(p);
}
}
static void busname_close_fd(BusName *n) {
assert(n);
n->starter_event_source = sd_event_source_unref(n->starter_event_source);
n->starter_fd = safe_close(n->starter_fd);
}
static void busname_done(Unit *u) {
BusName *n = BUSNAME(u);
assert(n);
free(n->name);
n->name = NULL;
busname_free_policy(n);
busname_unwatch_control_pid(n);
busname_close_fd(n);
unit_ref_unset(&n->service);
n->timer_event_source = sd_event_source_unref(n->timer_event_source);
}
static int busname_arm_timer(BusName *n) {
int r;
assert(n);
if (n->timeout_usec <= 0) {
n->timer_event_source = sd_event_source_unref(n->timer_event_source);
return 0;
}
if (n->timer_event_source) {
r = sd_event_source_set_time(n->timer_event_source, now(CLOCK_MONOTONIC) + n->timeout_usec);
if (r < 0)
return r;
return sd_event_source_set_enabled(n->timer_event_source, SD_EVENT_ONESHOT);
}
r = sd_event_add_time(
UNIT(n)->manager->event,
&n->timer_event_source,
CLOCK_MONOTONIC,
now(CLOCK_MONOTONIC) + n->timeout_usec, 0,
busname_dispatch_timer, n);
if (r < 0)
return r;
(void) sd_event_source_set_description(n->timer_event_source, "busname-timer");
return 0;
}
static int busname_add_default_default_dependencies(BusName *n) {
int r;
assert(n);
r = unit_add_dependency_by_name(UNIT(n), UNIT_BEFORE, SPECIAL_BUSNAMES_TARGET, NULL, true);
if (r < 0)
return r;
if (UNIT(n)->manager->running_as == MANAGER_SYSTEM) {
r = unit_add_two_dependencies_by_name(UNIT(n), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true);
if (r < 0)
return r;
}
return unit_add_two_dependencies_by_name(UNIT(n), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
}
static int busname_add_extras(BusName *n) {
Unit *u = UNIT(n);
int r;
assert(n);
if (!n->name) {
r = unit_name_to_prefix(u->id, &n->name);
if (r < 0)
return r;
}
if (!u->description) {
r = unit_set_description(u, n->name);
if (r < 0)
return r;
}
if (n->activating) {
if (!UNIT_DEREF(n->service)) {
Unit *x;
r = unit_load_related_unit(u, ".service", &x);
if (r < 0)
return r;
unit_ref_set(&n->service, x);
}
r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(n->service), true);
if (r < 0)
return r;
}
if (u->default_dependencies) {
r = busname_add_default_default_dependencies(n);
if (r < 0)
return r;
}
return 0;
}
static int busname_verify(BusName *n) {
char *e;
assert(n);
if (UNIT(n)->load_state != UNIT_LOADED)
return 0;
if (!service_name_is_valid(n->name)) {
log_unit_error(UNIT(n), "Name= setting is not a valid service name Refusing.");
return -EINVAL;
}
e = strjoina(n->name, ".busname");
if (!unit_has_name(UNIT(n), e)) {
log_unit_error(UNIT(n), "Name= setting doesn't match unit name. Refusing.");
return -EINVAL;
}
return 0;
}
static int busname_load(Unit *u) {
BusName *n = BUSNAME(u);
int r;
assert(u);
assert(u->load_state == UNIT_STUB);
r = unit_load_fragment_and_dropin(u);
if (r < 0)
return r;
if (u->load_state == UNIT_LOADED) {
/* This is a new unit? Then let's add in some extras */
r = busname_add_extras(n);
if (r < 0)
return r;
}
return busname_verify(n);
}
static void busname_dump(Unit *u, FILE *f, const char *prefix) {
BusName *n = BUSNAME(u);
assert(n);
assert(f);
fprintf(f,
"%sBus Name State: %s\n"
"%sResult: %s\n"
"%sName: %s\n"
"%sActivating: %s\n"
"%sAccept FD: %s\n",
prefix, busname_state_to_string(n->state),
prefix, busname_result_to_string(n->result),
prefix, n->name,
prefix, yes_no(n->activating),
prefix, yes_no(n->accept_fd));
if (n->control_pid > 0)
fprintf(f,
"%sControl PID: "PID_FMT"\n",
prefix, n->control_pid);
}
static void busname_unwatch_fd(BusName *n) {
int r;
assert(n);
if (!n->starter_event_source)
return;
r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_OFF);
if (r < 0)
log_unit_debug_errno(UNIT(n), r, "Failed to disable event source: %m");
}
static int busname_watch_fd(BusName *n) {
int r;
assert(n);
if (n->starter_fd < 0)
return 0;
if (n->starter_event_source) {
r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_ON);
if (r < 0)
goto fail;
} else {
r = sd_event_add_io(UNIT(n)->manager->event, &n->starter_event_source, n->starter_fd, EPOLLIN, busname_dispatch_io, n);
if (r < 0)
goto fail;
(void) sd_event_source_set_description(n->starter_event_source, "busname-starter");
}
return 0;
fail:
log_unit_warning_errno(UNIT(n), r, "Failed to watch starter fd: %m");
busname_unwatch_fd(n);
return r;
}
static int busname_open_fd(BusName *n) {
_cleanup_free_ char *path = NULL;
const char *mode;
assert(n);
if (n->starter_fd >= 0)
return 0;
mode = UNIT(n)->manager->running_as == MANAGER_SYSTEM ? "system" : "user";
n->starter_fd = bus_kernel_open_bus_fd(mode, &path);
if (n->starter_fd < 0)
return log_unit_warning_errno(UNIT(n), n->starter_fd, "Failed to open %s: %m", path ?: "kdbus");
return 0;
}
static void busname_set_state(BusName *n, BusNameState state) {
BusNameState old_state;
assert(n);
old_state = n->state;
n->state = state;
if (!IN_SET(state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) {
n->timer_event_source = sd_event_source_unref(n->timer_event_source);
busname_unwatch_control_pid(n);
}
if (state != BUSNAME_LISTENING)
busname_unwatch_fd(n);
if (!IN_SET(state, BUSNAME_LISTENING, BUSNAME_MAKING, BUSNAME_REGISTERED, BUSNAME_RUNNING))
busname_close_fd(n);
if (state != old_state)
log_unit_debug(UNIT(n), "Changed %s -> %s", busname_state_to_string(old_state), busname_state_to_string(state));
unit_notify(UNIT(n), state_translation_table[old_state], state_translation_table[state], true);
}
static int busname_coldplug(Unit *u) {
BusName *n = BUSNAME(u);
int r;
assert(n);
assert(n->state == BUSNAME_DEAD);
if (n->deserialized_state == n->state)
return 0;
if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) {
if (n->control_pid <= 0)
return -EBADMSG;
r = unit_watch_pid(UNIT(n), n->control_pid);
if (r < 0)
return r;
r = busname_arm_timer(n);
if (r < 0)
return r;
}
if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_LISTENING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) {
r = busname_open_fd(n);
if (r < 0)
return r;
}
if (n->deserialized_state == BUSNAME_LISTENING) {
r = busname_watch_fd(n);
if (r < 0)
return r;
}
busname_set_state(n, n->deserialized_state);
return 0;
}
static int busname_make_starter(BusName *n, pid_t *_pid) {
pid_t pid;
int r;
r = busname_arm_timer(n);
if (r < 0)
goto fail;
/* We have to resolve the user/group names out-of-process,
* hence let's fork here. It's messy, but well, what can we
* do? */
pid = fork();
if (pid < 0)
return -errno;
if (pid == 0) {
int ret;
(void) default_signals(SIGNALS_CRASH_HANDLER, SIGNALS_IGNORE, -1);
(void) ignore_signals(SIGPIPE, -1);
log_forget_fds();
r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, n->policy, n->policy_world);
if (r < 0) {
ret = EXIT_MAKE_STARTER;
goto fail_child;
}
_exit(0);
fail_child:
log_open();
log_error_errno(r, "Failed to create starter connection at step %s: %m", exit_status_to_string(ret, EXIT_STATUS_SYSTEMD));
_exit(ret);
}
r = unit_watch_pid(UNIT(n), pid);
if (r < 0)
goto fail;
*_pid = pid;
return 0;
fail:
n->timer_event_source = sd_event_source_unref(n->timer_event_source);
return r;
}
static void busname_enter_dead(BusName *n, BusNameResult f) {
assert(n);
if (f != BUSNAME_SUCCESS)
n->result = f;
busname_set_state(n, n->result != BUSNAME_SUCCESS ? BUSNAME_FAILED : BUSNAME_DEAD);
}
static void busname_enter_signal(BusName *n, BusNameState state, BusNameResult f) {
KillContext kill_context = {};
int r;
assert(n);
if (f != BUSNAME_SUCCESS)
n->result = f;
kill_context_init(&kill_context);
r = unit_kill_context(UNIT(n),
&kill_context,
state != BUSNAME_SIGTERM ? KILL_KILL : KILL_TERMINATE,
-1,
n->control_pid,
false);
if (r < 0) {
log_unit_warning_errno(UNIT(n), r, "Failed to kill control process: %m");
goto fail;
}
if (r > 0) {
r = busname_arm_timer(n);
if (r < 0) {
log_unit_warning_errno(UNIT(n), r, "Failed to arm timer: %m");
goto fail;
}
busname_set_state(n, state);
} else if (state == BUSNAME_SIGTERM)
busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_SUCCESS);
else
busname_enter_dead(n, BUSNAME_SUCCESS);
return;
fail:
busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES);
}
static void busname_enter_listening(BusName *n) {
int r;
assert(n);
if (n->activating) {
r = busname_watch_fd(n);
if (r < 0) {
log_unit_warning_errno(UNIT(n), r, "Failed to watch names: %m");
goto fail;
}
busname_set_state(n, BUSNAME_LISTENING);
} else
busname_set_state(n, BUSNAME_REGISTERED);
return;
fail:
busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_RESOURCES);
}
static void busname_enter_making(BusName *n) {
int r;
assert(n);
r = busname_open_fd(n);
if (r < 0)
goto fail;
if (n->policy) {
/* If there is a policy, we need to resolve user/group
* names, which we can't do from PID1, hence let's
* fork. */
busname_unwatch_control_pid(n);
r = busname_make_starter(n, &n->control_pid);
if (r < 0) {
log_unit_warning_errno(UNIT(n), r, "Failed to fork 'making' task: %m");
goto fail;
}
busname_set_state(n, BUSNAME_MAKING);
} else {
/* If there is no policy, we can do everything
* directly from PID 1, hence do so. */
r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, NULL, n->policy_world);
if (r < 0) {
log_unit_warning_errno(UNIT(n), r, "Failed to make starter: %m");
goto fail;
}
busname_enter_listening(n);
}
return;
fail:
busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES);
}
static void busname_enter_running(BusName *n) {
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
bool pending = false;
Unit *other;
Iterator i;
int r;
assert(n);
if (!n->activating)
return;
/* We don't take connections anymore if we are supposed to
* shut down anyway */
if (unit_stop_pending(UNIT(n))) {
log_unit_debug(UNIT(n), "Suppressing activation request since unit stop is scheduled.");
/* Flush all queued activation reqeuest by closing and reopening the connection */
bus_kernel_drop_one(n->starter_fd);
busname_enter_listening(n);
return;
}
/* If there's already a start pending don't bother to do
* anything */
SET_FOREACH(other, UNIT(n)->dependencies[UNIT_TRIGGERS], i)
if (unit_active_or_pending(other)) {
pending = true;
break;
}
if (!pending) {
r = manager_add_job(UNIT(n)->manager, JOB_START, UNIT_DEREF(n->service), JOB_REPLACE, true, &error, NULL);
if (r < 0)
goto fail;
}
busname_set_state(n, BUSNAME_RUNNING);
return;
fail:
log_unit_warning(UNIT(n), "Failed to queue service startup job: %s", bus_error_message(&error, r));
busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES);
}
static int busname_start(Unit *u) {
BusName *n = BUSNAME(u);
assert(n);
/* We cannot fulfill this request right now, try again later
* please! */
if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL))
return -EAGAIN;
/* Already on it! */
if (n->state == BUSNAME_MAKING)
return 0;
if (n->activating && UNIT_ISSET(n->service)) {
Service *service;
service = SERVICE(UNIT_DEREF(n->service));
if (UNIT(service)->load_state != UNIT_LOADED) {
log_unit_error(u, "Bus service %s not loaded, refusing.", UNIT(service)->id);
return -ENOENT;
}
}
assert(IN_SET(n->state, BUSNAME_DEAD, BUSNAME_FAILED));
n->result = BUSNAME_SUCCESS;
busname_enter_making(n);
return 1;
}
static int busname_stop(Unit *u) {
BusName *n = BUSNAME(u);
assert(n);
/* Already on it */
if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL))
return 0;
/* If there's already something running, we go directly into
* kill mode. */
if (n->state == BUSNAME_MAKING) {
busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_SUCCESS);
return -EAGAIN;
}
assert(IN_SET(n->state, BUSNAME_REGISTERED, BUSNAME_LISTENING, BUSNAME_RUNNING));
busname_enter_dead(n, BUSNAME_SUCCESS);
return 1;
}
static int busname_serialize(Unit *u, FILE *f, FDSet *fds) {
BusName *n = BUSNAME(u);
assert(n);
assert(f);
assert(fds);
unit_serialize_item(u, f, "state", busname_state_to_string(n->state));
unit_serialize_item(u, f, "result", busname_result_to_string(n->result));
if (n->control_pid > 0)
unit_serialize_item_format(u, f, "control-pid", PID_FMT, n->control_pid);
if (n->starter_fd >= 0) {
int copy;
copy = fdset_put_dup(fds, n->starter_fd);
if (copy < 0)
return copy;
unit_serialize_item_format(u, f, "starter-fd", "%i", copy);
}
return 0;
}
static int busname_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
BusName *n = BUSNAME(u);
assert(n);
assert(key);
assert(value);
if (streq(key, "state")) {
BusNameState state;
state = busname_state_from_string(value);
if (state < 0)
log_unit_debug(u, "Failed to parse state value: %s", value);
else
n->deserialized_state = state;
} else if (streq(key, "result")) {
BusNameResult f;
f = busname_result_from_string(value);
if (f < 0)
log_unit_debug(u, "Failed to parse result value: %s", value);
else if (f != BUSNAME_SUCCESS)
n->result = f;
} else if (streq(key, "control-pid")) {
pid_t pid;
if (parse_pid(value, &pid) < 0)
log_unit_debug(u, "Failed to parse control-pid value: %s", value);
else
n->control_pid = pid;
} else if (streq(key, "starter-fd")) {
int fd;
if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
log_unit_debug(u, "Failed to parse starter fd value: %s", value);
else {
safe_close(n->starter_fd);
n->starter_fd = fdset_remove(fds, fd);
}
} else
log_unit_debug(u, "Unknown serialization key: %s", key);
return 0;
}
_pure_ static UnitActiveState busname_active_state(Unit *u) {
assert(u);
return state_translation_table[BUSNAME(u)->state];
}
_pure_ static const char *busname_sub_state_to_string(Unit *u) {
assert(u);
return busname_state_to_string(BUSNAME(u)->state);
}
static int busname_peek_message(BusName *n) {
struct kdbus_cmd_recv cmd_recv = {
.size = sizeof(cmd_recv),
.flags = KDBUS_RECV_PEEK,
};
struct kdbus_cmd_free cmd_free = {
.size = sizeof(cmd_free),
};
const char *comm = NULL;
struct kdbus_item *d;
struct kdbus_msg *k;
size_t start, ps, sz, delta;
void *p = NULL;
pid_t pid = 0;
int r;
/* Generate a friendly debug log message about which process
* caused triggering of this bus name. This simply peeks the
* metadata of the first queued message and logs it. */
assert(n);
/* Let's shortcut things a bit, if debug logging is turned off
* anyway. */
if (log_get_max_level() < LOG_DEBUG)
return 0;
r = ioctl(n->starter_fd, KDBUS_CMD_RECV, &cmd_recv);
if (r < 0) {
if (errno == EINTR || errno == EAGAIN)
return 0;
return log_unit_error_errno(UNIT(n), errno, "Failed to query activation message: %m");
}
/* We map as late as possible, and unmap imemdiately after
* use. On 32bit address space is scarce and we want to be
* able to handle a lot of activator connections at the same
* time, and hence shouldn't keep the mmap()s around for
* longer than necessary. */
ps = page_size();
start = (cmd_recv.msg.offset / ps) * ps;
delta = cmd_recv.msg.offset - start;
sz = PAGE_ALIGN(delta + cmd_recv.msg.msg_size);
p = mmap(NULL, sz, PROT_READ, MAP_SHARED, n->starter_fd, start);
if (p == MAP_FAILED) {
r = log_unit_error_errno(UNIT(n), errno, "Failed to map activation message: %m");
goto finish;
}
k = (struct kdbus_msg *) ((uint8_t *) p + delta);
KDBUS_ITEM_FOREACH(d, k, items) {
switch (d->type) {
case KDBUS_ITEM_PIDS:
pid = d->pids.pid;
break;
case KDBUS_ITEM_PID_COMM:
comm = d->str;
break;
}
}
if (pid > 0)
log_unit_debug(UNIT(n), "Activation triggered by process " PID_FMT " (%s)", pid, strna(comm));
r = 0;
finish:
if (p)
(void) munmap(p, sz);
cmd_free.offset = cmd_recv.msg.offset;
if (ioctl(n->starter_fd, KDBUS_CMD_FREE, &cmd_free) < 0)
log_unit_warning(UNIT(n), "Failed to free peeked message, ignoring: %m");
return r;
}
static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
BusName *n = userdata;
assert(n);
assert(fd >= 0);
if (n->state != BUSNAME_LISTENING)
return 0;
log_unit_debug(UNIT(n), "Activation request");
if (revents != EPOLLIN) {
log_unit_error(UNIT(n), "Got unexpected poll event (0x%x) on starter fd.", revents);
goto fail;
}
busname_peek_message(n);
busname_enter_running(n);
return 0;
fail:
busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES);
return 0;
}
static void busname_sigchld_event(Unit *u, pid_t pid, int code, int status) {
BusName *n = BUSNAME(u);
BusNameResult f;
assert(n);
assert(pid >= 0);
if (pid != n->control_pid)
return;
n->control_pid = 0;
if (is_clean_exit(code, status, NULL))
f = BUSNAME_SUCCESS;
else if (code == CLD_EXITED)
f = BUSNAME_FAILURE_EXIT_CODE;
else if (code == CLD_KILLED)
f = BUSNAME_FAILURE_SIGNAL;
else if (code == CLD_DUMPED)
f = BUSNAME_FAILURE_CORE_DUMP;
else
assert_not_reached("Unknown sigchld code");
log_unit_full(u, f == BUSNAME_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
"Control process exited, code=%s status=%i", sigchld_code_to_string(code), status);
if (f != BUSNAME_SUCCESS)
n->result = f;
switch (n->state) {
case BUSNAME_MAKING:
if (f == BUSNAME_SUCCESS)
busname_enter_listening(n);
else
busname_enter_signal(n, BUSNAME_SIGTERM, f);
break;
case BUSNAME_SIGTERM:
case BUSNAME_SIGKILL:
busname_enter_dead(n, f);
break;
default:
assert_not_reached("Uh, control process died at wrong time.");
}
/* Notify clients about changed exit status */
unit_add_to_dbus_queue(u);
}
static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
BusName *n = BUSNAME(userdata);
assert(n);
assert(n->timer_event_source == source);
switch (n->state) {
case BUSNAME_MAKING:
log_unit_warning(UNIT(n), "Making timed out. Terminating.");
busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_TIMEOUT);
break;
case BUSNAME_SIGTERM:
log_unit_warning(UNIT(n), "Stopping timed out. Killing.");
busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_FAILURE_TIMEOUT);
break;
case BUSNAME_SIGKILL:
log_unit_warning(UNIT(n), "Processes still around after SIGKILL. Ignoring.");
busname_enter_dead(n, BUSNAME_FAILURE_TIMEOUT);
break;
default:
assert_not_reached("Timeout at wrong time.");
}
return 0;
}
static void busname_reset_failed(Unit *u) {
BusName *n = BUSNAME(u);
assert(n);
if (n->state == BUSNAME_FAILED)
busname_set_state(n, BUSNAME_DEAD);
n->result = BUSNAME_SUCCESS;
}
static void busname_trigger_notify(Unit *u, Unit *other) {
BusName *n = BUSNAME(u);
Service *s;
assert(n);
assert(other);
if (!IN_SET(n->state, BUSNAME_RUNNING, BUSNAME_LISTENING))
return;
if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE)
return;
s = SERVICE(other);
if (s->state == SERVICE_FAILED && s->result == SERVICE_FAILURE_START_LIMIT)
busname_enter_dead(n, BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT);
else if (IN_SET(s->state,
SERVICE_DEAD, SERVICE_FAILED,
SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL,
SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
SERVICE_AUTO_RESTART))
busname_enter_listening(n);
}
static int busname_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
return unit_kill_common(u, who, signo, -1, BUSNAME(u)->control_pid, error);
}
static int busname_get_timeout(Unit *u, uint64_t *timeout) {
BusName *n = BUSNAME(u);
int r;
if (!n->timer_event_source)
return 0;
r = sd_event_source_get_time(n->timer_event_source, timeout);
if (r < 0)
return r;
return 1;
}
static bool busname_supported(void) {
static int supported = -1;
if (supported < 0)
supported = is_kdbus_available();
return supported;
}
static const char* const busname_state_table[_BUSNAME_STATE_MAX] = {
[BUSNAME_DEAD] = "dead",
[BUSNAME_MAKING] = "making",
[BUSNAME_REGISTERED] = "registered",
[BUSNAME_LISTENING] = "listening",
[BUSNAME_RUNNING] = "running",
[BUSNAME_SIGTERM] = "sigterm",
[BUSNAME_SIGKILL] = "sigkill",
[BUSNAME_FAILED] = "failed",
};
DEFINE_STRING_TABLE_LOOKUP(busname_state, BusNameState);
static const char* const busname_result_table[_BUSNAME_RESULT_MAX] = {
[BUSNAME_SUCCESS] = "success",
[BUSNAME_FAILURE_RESOURCES] = "resources",
[BUSNAME_FAILURE_TIMEOUT] = "timeout",
[BUSNAME_FAILURE_EXIT_CODE] = "exit-code",
[BUSNAME_FAILURE_SIGNAL] = "signal",
[BUSNAME_FAILURE_CORE_DUMP] = "core-dump",
[BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT] = "service-failed-permanent",
};
DEFINE_STRING_TABLE_LOOKUP(busname_result, BusNameResult);
const UnitVTable busname_vtable = {
.object_size = sizeof(BusName),
.sections =
"Unit\0"
"BusName\0"
"Install\0",
.private_section = "BusName",
.no_alias = true,
.no_instances = true,
.init = busname_init,
.done = busname_done,
.load = busname_load,
.coldplug = busname_coldplug,
.dump = busname_dump,
.start = busname_start,
.stop = busname_stop,
.kill = busname_kill,
.get_timeout = busname_get_timeout,
.serialize = busname_serialize,
.deserialize_item = busname_deserialize_item,
.active_state = busname_active_state,
.sub_state_to_string = busname_sub_state_to_string,
.sigchld_event = busname_sigchld_event,
.trigger_notify = busname_trigger_notify,
.reset_failed = busname_reset_failed,
.supported = busname_supported,
.bus_interface = "org.freedesktop.systemd1.BusName",
.bus_vtable = bus_busname_vtable,
.status_message_formats = {
.finished_start_job = {
[JOB_DONE] = "Listening on %s.",
[JOB_FAILED] = "Failed to listen on %s.",
[JOB_DEPENDENCY] = "Dependency failed for %s.",
[JOB_TIMEOUT] = "Timed out starting %s.",
},
.finished_stop_job = {
[JOB_DONE] = "Closed %s.",
[JOB_FAILED] = "Failed stopping %s.",
[JOB_TIMEOUT] = "Timed out stopping %s.",
},
},
};
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