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add basic (and not very useful) D-Bus support

This commit is contained in:
Lennart Poettering 2010-02-01 03:33:24 +01:00
parent b9f880f4f4
commit ea4309869e
18 changed files with 1392 additions and 23 deletions
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10
Makefile
View File

@ -1,5 +1,5 @@
CFLAGS=-Wall -Wextra -O0 -g -pipe -D_GNU_SOURCE -fdiagnostics-show-option -Wno-unused-parameter -DUNIT_PATH=\"/tmp/does/not/exist\" `pkg-config --cflags libudev`
LIBS=-lrt -lcap `pkg-config --libs libudev`
CFLAGS=-Wall -Wextra -O0 -g -pipe -D_GNU_SOURCE -fdiagnostics-show-option -Wno-unused-parameter -DUNIT_PATH=\"/tmp/does/not/exist\" `pkg-config --cflags libudev dbus-1`
LIBS=-lrt -lcap `pkg-config --libs libudev dbus-1`
COMMON= \
unit.o \
@ -23,7 +23,11 @@ COMMON= \
timer.o \
load-dropin.o \
execute.o \
ratelimit.o
ratelimit.o \
dbus.o \
dbus-manager.o \
dbus-unit.o \
dbus-job.o
all: systemd test-engine test-job-type systemd-logger

4
conf-parser.h
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@ -8,12 +8,12 @@
/* An abstract parser for simple, line based, shallow configuration
* files consisting of variable assignments only. */
typedef int (*config_parser_cb_t)(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
typedef int (*ConfigParserCallback)(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
/* Wraps info for parsing a specific configuration variable */
typedef struct ConfigItem {
const char *lvalue; /* name of the variable */
config_parser_cb_t parse; /* Function that is called to parse the variable's value */
ConfigParserCallback parse; /* Function that is called to parse the variable's value */
void *data; /* Where to store the variable's data */
const char *section;
} ConfigItem;

32
dbus-job.c Normal file
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@ -0,0 +1,32 @@
/*-*- Mode: C; c-basic-offset: 8 -*-*/
#include "dbus.h"
#include "log.h"
static const char introspection[] =
DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
"<node>"
" <interface name=\"org.freedesktop.systemd1.Job\">"
" </interface>"
BUS_PROPERTIES_INTERFACE
BUS_INTROSPECTABLE_INTERFACE
"</node>";
DBusHandlerResult bus_job_message_handler(DBusConnection *connection, DBusMessage *message, void *data) {
Manager *m = data;
assert(connection);
assert(message);
assert(m);
log_debug("Got D-Bus request: %s.%s() on %s",
dbus_message_get_interface(message),
dbus_message_get_member(message),
dbus_message_get_path(message));
return bus_default_message_handler(m, message, introspection, NULL);
}
const DBusObjectPathVTable bus_job_vtable = {
.message_function = bus_job_message_handler
};

359
dbus-manager.c Normal file
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@ -0,0 +1,359 @@
/*-*- Mode: C; c-basic-offset: 8 -*-*/
#include <errno.h>
#include "dbus.h"
#include "log.h"
#define INTROSPECTION_BEGIN \
DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE \
"<node>" \
" <interface name=\"org.freedesktop.systemd1\">" \
" <method name=\"GetUnit\">" \
" <arg name=\"name\" type=\"s\" direction=\"in\"/>" \
" <arg name=\"unit\" type=\"o\" direction=\"out\"/>" \
" </method>" \
" <method name=\"LoadUnit\">" \
" <arg name=\"name\" type=\"s\" direction=\"in\"/>" \
" <arg name=\"unit\" type=\"o\" direction=\"out\"/>" \
" </method>" \
" <method name=\"GetJob\">" \
" <arg name=\"id\" type=\"u\" direction=\"in\"/>" \
" <arg name=\"unit\" type=\"o\" direction=\"out\"/>" \
" </method>" \
" <method name=\"ClearJobs\"/>" \
" <method name=\"ListUnits\">" \
" <arg name=\"units\" type=\"a(ssssouso)\" direction=\"out\"/>" \
" </method>" \
" <method name=\"ListJobs\">" \
" <arg name=\"jobs\" type=\"a(usssoo)\" direction=\"out\"/>" \
" </method>" \
" </interface>" \
BUS_PROPERTIES_INTERFACE \
BUS_INTROSPECTABLE_INTERFACE
#define INTROSPECTION_END \
"</node>"
DBusHandlerResult bus_manager_message_handler(DBusConnection *connection, DBusMessage *message, void *data) {
int r;
Manager *m = data;
DBusError error;
DBusMessage *reply = NULL;
char * path = NULL;
assert(connection);
assert(message);
assert(m);
dbus_error_init(&error);
log_debug("Got D-Bus request: %s.%s() on %s",
dbus_message_get_interface(message),
dbus_message_get_member(message),
dbus_message_get_path(message));
if (dbus_message_is_method_call(message, "org.freedesktop.systemd1", "GetUnit")) {
const char *name;
Unit *u;
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_STRING, &name,
DBUS_TYPE_INVALID))
return bus_send_error_reply(m, message, &error, -EINVAL);
if (!(u = manager_get_unit(m, name)))
return bus_send_error_reply(m, message, NULL, -ENOENT);
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
if (!(path = unit_dbus_path(u)))
goto oom;
if (!dbus_message_append_args(
reply,
DBUS_TYPE_OBJECT_PATH, &path,
DBUS_TYPE_INVALID))
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1", "LoadUnit")) {
const char *name;
Unit *u;
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_STRING, &name,
DBUS_TYPE_INVALID))
return bus_send_error_reply(m, message, &error, -EINVAL);
if ((r = manager_load_unit(m, name, &u)) < 0)
return bus_send_error_reply(m, message, NULL, r);
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
if (!(path = unit_dbus_path(u)))
goto oom;
if (!dbus_message_append_args(
reply,
DBUS_TYPE_OBJECT_PATH, &path,
DBUS_TYPE_INVALID))
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1", "GetJob")) {
uint32_t id;
Job *j;
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_UINT32, &id,
DBUS_TYPE_INVALID))
return bus_send_error_reply(m, message, &error, -EINVAL);
if (!(j = manager_get_job(m, id)))
return bus_send_error_reply(m, message, NULL, -ENOENT);
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
if (!(path = job_dbus_path(j)))
goto oom;
if (!dbus_message_append_args(
reply,
DBUS_TYPE_OBJECT_PATH, &path,
DBUS_TYPE_INVALID))
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1", "ClearJobs")) {
manager_clear_jobs(m);
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1", "ListUnits")) {
DBusMessageIter iter, sub;
Iterator i;
Unit *u;
const char *k;
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
dbus_message_iter_init_append(reply, &iter);
if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(ssssouso)", &sub))
goto oom;
HASHMAP_FOREACH_KEY(u, k, m->units, i) {
char *unit_path, *job_path;
const char *id, *description, *load_state, *active_state, *job_type;
DBusMessageIter sub2;
uint32_t job_id;
id = unit_id(u);
if (k != id)
continue;
if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
goto oom;
description = unit_description(u);
load_state = unit_load_state_to_string(u->meta.load_state);
active_state = unit_active_state_to_string(unit_active_state(u));
if (!(unit_path = unit_dbus_path(u)))
goto oom;
if (u->meta.job) {
job_id = (uint32_t) u->meta.job->id;
if (!(job_path = job_dbus_path(u->meta.job))) {
free(unit_path);
goto oom;
}
job_type = job_type_to_string(u->meta.job->state);
} else {
job_id = 0;
job_path = unit_path;
job_type = "";
}
if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &id) ||
!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &description) ||
!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &load_state) ||
!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &active_state) ||
!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &unit_path) ||
!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &job_id) ||
!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &job_type) ||
!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &job_path)) {
free(unit_path);
if (u->meta.job)
free(job_path);
goto oom;
}
free(unit_path);
if (u->meta.job)
free(job_path);
if (!dbus_message_iter_close_container(&sub, &sub2))
goto oom;
}
if (!dbus_message_iter_close_container(&iter, &sub))
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1", "ListJobs")) {
DBusMessageIter iter, sub;
Iterator i;
Job *j;
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
dbus_message_iter_init_append(reply, &iter);
if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(usssoo)", &sub))
goto oom;
HASHMAP_FOREACH(j, m->jobs, i) {
char *unit_path, *job_path;
const char *unit, *state, *type;
uint32_t id;
DBusMessageIter sub2;
if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
goto oom;
id = (uint32_t) j->id;
unit = unit_id(j->unit);
state = job_state_to_string(j->state);
type = job_type_to_string(j->state);
if (!(job_path = job_dbus_path(j)))
goto oom;
if (!(unit_path = unit_dbus_path(j->unit))) {
free(job_path);
goto oom;
}
if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &id) ||
!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &unit) ||
!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &type) ||
!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &state) ||
!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &job_path) ||
!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &unit_path)) {
free(job_path);
free(unit_path);
goto oom;
}
free(job_path);
free(unit_path);
if (!dbus_message_iter_close_container(&sub, &sub2))
goto oom;
}
if (!dbus_message_iter_close_container(&iter, &sub))
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
char *introspection = NULL;
FILE *f;
Iterator i;
Unit *u;
Job *j;
const char *k;
size_t size;
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
/* We roll our own introspection code here, instead of
* relying on bus_default_message_handler() because we
* need to generate our introspection string
* dynamically. */
if (!(f = open_memstream(&introspection, &size)))
goto oom;
fputs(INTROSPECTION_BEGIN, f);
HASHMAP_FOREACH_KEY(u, k, m->units, i) {
char *p;
if (k != unit_id(u))
continue;
if (!(p = bus_path_escape(k))) {
fclose(f);
free(introspection);
goto oom;
}
fprintf(f, "<node name=\"unit/%s\"/>", p);
free(p);
}
HASHMAP_FOREACH(j, m->jobs, i)
fprintf(f, "<node name=\"job/%lu\"/>", (unsigned long) j->id);
fputs(INTROSPECTION_END, f);
if (ferror(f)) {
fclose(f);
free(introspection);
goto oom;
}
fclose(f);
if (!introspection)
goto oom;
if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
free(introspection);
goto oom;
}
free(introspection);
} else
return bus_default_message_handler(m, message, NULL, NULL);
free(path);
if (reply) {
if (!dbus_connection_send(connection, reply, NULL))
goto oom;
dbus_message_unref(reply);
}
return DBUS_HANDLER_RESULT_HANDLED;
oom:
free(path);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return DBUS_HANDLER_RESULT_NEED_MEMORY;
}
const DBusObjectPathVTable bus_manager_vtable = {
.message_function = bus_manager_message_handler
};

133
dbus-unit.c Normal file
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@ -0,0 +1,133 @@
/*-*- Mode: C; c-basic-offset: 8 -*-*/
#include <errno.h>
#include "dbus.h"
#include "log.h"
static const char introspection[] =
DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
"<node>"
" <!-- you suck -->"
" <interface name=\"org.freedesktop.systemd1.Unit\">"
" <property name=\"Id\" type=\"s\" access=\"read\"/>"
" <property name=\"Description\" type=\"s\" access=\"read\"/>"
" <property name=\"LoadState\" type=\"s\" access=\"read\"/>"
" <property name=\"ActiveState\" type=\"s\" access=\"read\"/>"
" </interface>"
BUS_PROPERTIES_INTERFACE
BUS_INTROSPECTABLE_INTERFACE
"</node>";
static int bus_unit_append_id(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
const char *id;
assert(m);
assert(i);
assert(property);
assert(u);
id = unit_id(u);
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &u))
return -ENOMEM;
return 0;
}
static int bus_unit_append_description(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
const char *d;
assert(m);
assert(i);
assert(property);
assert(u);
d = unit_description(u);
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &d))
return -ENOMEM;
return 0;
}
static int bus_unit_append_load_state(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
const char *state;
assert(m);
assert(i);
assert(property);
assert(u);
state = unit_load_state_to_string(u->meta.load_state);
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state))
return -ENOMEM;
return 0;
}
static int bus_unit_append_active_state(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
const char *state;
assert(m);
assert(i);
assert(property);
assert(u);
state = unit_active_state_to_string(unit_active_state(u));
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state))
return -ENOMEM;
return 0;
}
static DBusHandlerResult bus_unit_message_dispatch(Unit *u, DBusMessage *message) {
const BusProperty properties[] = {
{ "org.freedesktop.systemd1.Unit", "Id", bus_unit_append_id, "s", u },
{ "org.freedesktop.systemd1.Unit", "Description", bus_unit_append_description, "s", u },
{ "org.freedesktop.systemd1.Unit", "LoadState", bus_unit_append_load_state, "s", u },
{ "org.freedesktop.systemd1.Unit", "ActiveState", bus_unit_append_active_state, "s", u },
{ NULL, NULL, NULL, NULL, NULL }
};
return bus_default_message_handler(u->meta.manager, message, introspection, properties);
}
static DBusHandlerResult bus_unit_message_handler(DBusConnection *connection, DBusMessage *message, void *data) {
Manager *m = data;
Unit *u;
int r;
assert(connection);
assert(message);
assert(m);
log_debug("Got D-Bus request: %s.%s() on %s",
dbus_message_get_interface(message),
dbus_message_get_member(message),
dbus_message_get_path(message));
if ((r = manager_get_unit_from_dbus_path(m, dbus_message_get_path(message), &u)) < 0) {
if (r == -ENOMEM)
return DBUS_HANDLER_RESULT_NEED_MEMORY;
if (r == -ENOENT)
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
return bus_send_error_reply(m, message, NULL, r);
}
return bus_unit_message_dispatch(u, message);
}
const DBusObjectPathVTable bus_unit_vtable = {
.message_function = bus_unit_message_handler
};

608
dbus.c Normal file
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@ -0,0 +1,608 @@
/*-*- Mode: C; c-basic-offset: 8 -*-*/
#include <dbus/dbus.h>
#include <sys/epoll.h>
#include <sys/timerfd.h>
#include <errno.h>
#include <unistd.h>
#include "dbus.h"
#include "log.h"
#include "strv.h"
static void bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data) {
Manager *m = data;
assert(bus);
assert(m);
m->request_bus_dispatch = status != DBUS_DISPATCH_COMPLETE;
}
static uint32_t bus_flags_to_events(DBusWatch *bus_watch) {
unsigned flags;
uint32_t events = 0;
assert(bus_watch);
/* no watch flags for disabled watches */
if (!dbus_watch_get_enabled(bus_watch))
return 0;
flags = dbus_watch_get_flags(bus_watch);
if (flags & DBUS_WATCH_READABLE)
events |= EPOLLIN;
if (flags & DBUS_WATCH_WRITABLE)
events |= EPOLLOUT;
return events | EPOLLHUP | EPOLLERR;
}
static unsigned events_to_bus_flags(uint32_t events) {
unsigned flags = 0;
if (events & EPOLLIN)
flags |= DBUS_WATCH_READABLE;
if (events & EPOLLOUT)
flags |= DBUS_WATCH_WRITABLE;
if (events & EPOLLHUP)
flags |= DBUS_WATCH_HANGUP;
if (events & EPOLLERR)
flags |= DBUS_WATCH_ERROR;
return flags;
}
void bus_watch_event(Manager *m, Watch *w, int events) {
assert(m);
assert(w);
/* This is called by the event loop whenever there is
* something happening on D-Bus' file handles. */
if (!(dbus_watch_get_enabled(w->data.bus_watch)))
return;
dbus_watch_handle(w->data.bus_watch, events_to_bus_flags(events));
}
static dbus_bool_t bus_add_watch(DBusWatch *bus_watch, void *data) {
Manager *m = data;
Watch *w;
struct epoll_event ev;
assert(bus_watch);
assert(m);
if (!(w = new0(Watch, 1)))
return FALSE;
w->fd = dbus_watch_get_unix_fd(bus_watch);
w->type = WATCH_DBUS_WATCH;
w->data.bus_watch = bus_watch;
zero(ev);
ev.events = bus_flags_to_events(bus_watch);
ev.data.ptr = w;
if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
if (errno != EEXIST) {
free(w);
return FALSE;
}
/* Hmm, bloody D-Bus creates multiple watches on the
* same fd. epoll() does not like that. As a dirty
* hack we simply dup() the fd and hence get a second
* one we can safely add to the epoll(). */
if ((w->fd = dup(w->fd)) < 0) {
free(w);
return FALSE;
}
if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
free(w);
close_nointr_nofail(w->fd);
return FALSE;
}
w->fd_is_dupped = true;
}
dbus_watch_set_data(bus_watch, w, NULL);
return TRUE;
}
static void bus_remove_watch(DBusWatch *bus_watch, void *data) {
Manager *m = data;
Watch *w;
assert(bus_watch);
assert(m);
if (!(w = dbus_watch_get_data(bus_watch)))
return;
assert(w->type == WATCH_DBUS_WATCH);
assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
if (w->fd_is_dupped)
close_nointr_nofail(w->fd);
free(w);
}
static void bus_toggle_watch(DBusWatch *bus_watch, void *data) {
Manager *m = data;
Watch *w;
struct epoll_event ev;
assert(bus_watch);
assert(m);
assert_se(w = dbus_watch_get_data(bus_watch));
assert(w->type == WATCH_DBUS_WATCH);
zero(ev);
ev.events = bus_flags_to_events(bus_watch);
ev.data.ptr = w;
assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_MOD, w->fd, &ev) == 0);
}
static int bus_timeout_arm(Manager *m, Watch *w) {
struct itimerspec its;
assert(m);
assert(w);
zero(its);
if (dbus_timeout_get_enabled(w->data.bus_timeout)) {
timespec_store(&its.it_value, dbus_timeout_get_interval(w->data.bus_timeout) * USEC_PER_MSEC);
its.it_interval = its.it_interval;
}
if (timerfd_settime(w->fd, 0, &its, NULL) < 0)
return -errno;
return 0;
}
void bus_timeout_event(Manager *m, Watch *w, int events) {
assert(m);
assert(w);
/* This is called by the event loop whenever there is
* something happening on D-Bus' file handles. */
if (!(dbus_timeout_get_enabled(w->data.bus_timeout)))
return;
dbus_timeout_handle(w->data.bus_timeout);
}
static dbus_bool_t bus_add_timeout(DBusTimeout *timeout, void *data) {
Manager *m = data;
Watch *w;
struct epoll_event ev;
assert(timeout);
assert(m);
if (!(w = new0(Watch, 1)))
return FALSE;
if (!(w->fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
goto fail;
w->type = WATCH_DBUS_TIMEOUT;
w->data.bus_timeout = timeout;
if (bus_timeout_arm(m, w) < 0)
goto fail;
zero(ev);
ev.events = EPOLLIN;
ev.data.ptr = w;
if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0)
goto fail;
dbus_timeout_set_data(timeout, w, NULL);
return TRUE;
fail:
if (w->fd >= 0)
close_nointr_nofail(w->fd);
free(w);
return FALSE;
}
static void bus_remove_timeout(DBusTimeout *timeout, void *data) {
Manager *m = data;
Watch *w;
assert(timeout);
assert(m);
if (!(w = dbus_timeout_get_data(timeout)))
return;
assert(w->type == WATCH_DBUS_TIMEOUT);
assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
close_nointr_nofail(w->fd);
free(w);
}
static void bus_toggle_timeout(DBusTimeout *timeout, void *data) {
Manager *m = data;
Watch *w;
int r;
assert(timeout);
assert(m);
assert_se(w = dbus_timeout_get_data(timeout));
assert(w->type == WATCH_DBUS_TIMEOUT);
if ((r = bus_timeout_arm(m, w)) < 0)
log_error("Failed to rearm timer: %s", strerror(-r));
}
void bus_dispatch(Manager *m) {
assert(m);
if (dbus_connection_dispatch(m->bus) == DBUS_DISPATCH_COMPLETE)
m->request_bus_dispatch = false;
}
static int request_name(Manager *m) {
DBusMessage *message;
const char *name = "org.freedesktop.systemd1";
uint32_t flags = 0;
if (!(message = dbus_message_new_method_call(
DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"RequestName")))
return -ENOMEM;
if (!dbus_message_append_args(
message,
DBUS_TYPE_STRING, &name,
DBUS_TYPE_UINT32, &flags,
DBUS_TYPE_INVALID)) {
dbus_message_unref(message);
return -ENOMEM;
}
if (!dbus_connection_send(m->bus, message, NULL)) {
dbus_message_unref(message);
return -ENOMEM;
}
/* We simple ask for the name and don't wait for it. Sooner or
* later we'll have it, and we wouldn't know what to do on
* error anyway. */
dbus_message_unref(message);
return 0;
}
int bus_init(Manager *m) {
DBusError error;
char *id;
int r;
assert(m);
if (m->bus)
return 0;
dbus_connection_set_change_sigpipe(FALSE);
dbus_error_init(&error);
if (!(m->bus = dbus_bus_get_private(m->is_init ? DBUS_BUS_SYSTEM : DBUS_BUS_SESSION, &error))) {
log_error("Failed to get D-Bus connection: %s", error.message);
dbus_error_free(&error);
return -ECONNREFUSED;
}
dbus_connection_set_exit_on_disconnect(m->bus, FALSE);
dbus_connection_set_dispatch_status_function(m->bus, bus_dispatch_status, m, NULL);
if (!dbus_connection_set_watch_functions(m->bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) ||
!dbus_connection_set_timeout_functions(m->bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL) ||
!dbus_connection_register_object_path(m->bus, "/org/freedesktop/systemd1", &bus_manager_vtable, m) ||
!dbus_connection_register_fallback(m->bus, "/org/freedesktop/systemd1/unit", &bus_unit_vtable, m) ||
!dbus_connection_register_fallback(m->bus, "/org/freedesktop/systemd1/job", &bus_job_vtable, m)) {
bus_done(m);
return -ENOMEM;
}
if ((r = request_name(m)) < 0) {
bus_done(m);
return r;
}
log_debug("Successfully connected to D-Bus bus %s as %s",
strnull((id = dbus_connection_get_server_id(m->bus))),
strnull(dbus_bus_get_unique_name(m->bus)));
dbus_free(id);
m->request_bus_dispatch = true;
return 0;
}
void bus_done(Manager *m) {
assert(m);
if (m->bus) {
dbus_connection_close(m->bus);
dbus_connection_unref(m->bus);
m->bus = NULL;
}
}
DBusHandlerResult bus_default_message_handler(Manager *m, DBusMessage *message, const char*introspection, const BusProperty *properties) {
DBusError error;
DBusMessage *reply = NULL;
int r;
assert(m);
assert(message);
dbus_error_init(&error);
if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) {
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID))
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && properties) {
const char *interface, *property;
const BusProperty *p;
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_STRING, &interface,
DBUS_TYPE_STRING, &property,
DBUS_TYPE_INVALID))
return bus_send_error_reply(m, message, &error, -EINVAL);
for (p = properties; p->property; p++)
if (streq(p->interface, interface) && streq(p->property, property))
break;
if (p->property) {
DBusMessageIter iter, sub;
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
dbus_message_iter_init_append(reply, &iter);
if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub))
goto oom;
if ((r = p->append(m, &sub, property, p->data)) < 0) {
if (r == -ENOMEM)
goto oom;
dbus_message_unref(reply);
return bus_send_error_reply(m, message, NULL, r);
}
if (!dbus_message_iter_close_container(&iter, &sub))
goto oom;
}
} else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && properties) {
const char *interface;
const BusProperty *p;
DBusMessageIter iter, sub, sub2, sub3;
bool any = false;
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_STRING, &interface,
DBUS_TYPE_INVALID))
return bus_send_error_reply(m, message, &error, -EINVAL);
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
dbus_message_iter_init_append(reply, &iter);
if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub))
goto oom;
for (p = properties; p->property; p++) {
if (!streq(p->interface, interface))
continue;
if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, "sv" , &sub2) ||
!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) ||
!dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3))
goto oom;
if ((r = p->append(m, &sub3, p->property, p->data)) < 0) {
if (r == -ENOMEM)
goto oom;
dbus_message_unref(reply);
return bus_send_error_reply(m, message, NULL, r);
}
if (!dbus_message_iter_close_container(&sub2, &sub3) ||
!dbus_message_iter_close_container(&sub, &sub2))
goto oom;
any = true;
}
if (!dbus_message_iter_close_container(&iter, &sub))
goto oom;
}
if (reply) {
if (!dbus_connection_send(m->bus, reply, NULL))
goto oom;
dbus_message_unref(reply);
return DBUS_HANDLER_RESULT_HANDLED;
}
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
oom:
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return DBUS_HANDLER_RESULT_NEED_MEMORY;
}
static const char *error_to_dbus(int error) {
switch(error) {
case -EINVAL:
return DBUS_ERROR_INVALID_ARGS;
case -ENOMEM:
return DBUS_ERROR_NO_MEMORY;
case -EPERM:
case -EACCES:
return DBUS_ERROR_ACCESS_DENIED;
case -ESRCH:
return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN;
case -ENOENT:
return DBUS_ERROR_FILE_NOT_FOUND;
case -EEXIST:
return DBUS_ERROR_FILE_EXISTS;
case -ETIMEDOUT:
return DBUS_ERROR_TIMEOUT;
case -EIO:
return DBUS_ERROR_IO_ERROR;
case -ENETRESET:
case -ECONNABORTED:
case -ECONNRESET:
return DBUS_ERROR_DISCONNECTED;
}
return DBUS_ERROR_FAILED;
}
DBusHandlerResult bus_send_error_reply(Manager *m, DBusMessage *message, DBusError *bus_error, int error) {
DBusMessage *reply = NULL;
const char *name, *text;
if (bus_error && dbus_error_is_set(bus_error)) {
name = bus_error->name;
text = bus_error->message;
} else {
name = error_to_dbus(error);
text = strerror(-error);
}
if (!(reply = dbus_message_new_error(message, name, text)))
goto oom;
if (!dbus_connection_send(m->bus, reply, NULL))
goto oom;
dbus_message_unref(reply);
if (bus_error)
dbus_error_free(bus_error);
return DBUS_HANDLER_RESULT_HANDLED;
oom:
if (reply)
dbus_message_unref(reply);
if (bus_error)
dbus_error_free(bus_error);
return DBUS_HANDLER_RESULT_NEED_MEMORY;
}
int bus_property_append_string(Manager *m, DBusMessageIter *i, const char *property, void *data) {
const char *t = data;
assert(m);
assert(i);
assert(property);
assert(t);
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
return -ENOMEM;
return 0;
}
int bus_property_append_strv(Manager *m, DBusMessageIter *i, const char *property, void *data) {
DBusMessageIter sub;
char **t = data;
assert(m);
assert(i);
assert(property);
if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
return -ENOMEM;
STRV_FOREACH(t, t)
if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t))
return -ENOMEM;
if (!dbus_message_iter_close_container(i, &sub))
return -ENOMEM;
return 0;
}
int bus_property_append_bool(Manager *m, DBusMessageIter *i, const char *property, void *data) {
bool *b = data;
dbus_bool_t db;
assert(m);
assert(i);
assert(property);
assert(b);
db = *b;
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
return -ENOMEM;
return 0;
}

60
dbus.h Normal file
View File

@ -0,0 +1,60 @@
/*-*- Mode: C; c-basic-offset: 8 -*-*/
#ifndef foodbushfoo
#define foodbushfoo
#include <dbus/dbus.h>
#include "manager.h"
typedef int (*BusPropertyCallback)(Manager *m, DBusMessageIter *iter, const char *property, void *data);
typedef struct BusProperty {
const char *interface; /* interface of the property */
const char *property; /* name of the property */
BusPropertyCallback append; /* Function that is called to serialize this property */
const char *signature;
void *data; /* The data of this property */
} BusProperty;
#define BUS_PROPERTIES_INTERFACE \
" <interface name=\"org.freedesktop.DBus.Properties\">" \
" <method name=\"Get\">" \
" <arg name=\"interface\" direction=\"in\" type=\"s\"/>" \
" <arg name=\"property\" direction=\"in\" type=\"s\"/>" \
" <arg name=\"value\" direction=\"out\" type=\"v\"/>" \
" </method>" \
" <method name=\"GetAll\">" \
" <arg name=\"interface\" direction=\"in\" type=\"s\"/>" \
" <arg name=\"properties\" direction=\"out\" type=\"a{sv}\"/>" \
" </method>" \
" </interface>"
#define BUS_INTROSPECTABLE_INTERFACE \
" <interface name=\"org.freedesktop.DBus.Introspectable\">" \
" <method name=\"Introspect\">" \
" <arg name=\"data\" type=\"s\" direction=\"out\"/>" \
" </method>" \
" </interface>"
int bus_init(Manager *m);
void bus_done(Manager *m);
void bus_dispatch(Manager *m);
void bus_watch_event(Manager *m, Watch *w, int events);
void bus_timeout_event(Manager *m, Watch *w, int events);
DBusHandlerResult bus_default_message_handler(Manager *m, DBusMessage *message, const char* introspection, const BusProperty *properties);
DBusHandlerResult bus_send_error_reply(Manager *m, DBusMessage *message, DBusError *bus_error, int error);
int bus_property_append_string(Manager *m, DBusMessageIter *i, const char *property, void *data);
int bus_property_append_strv(Manager *m, DBusMessageIter *i, const char *property, void *data);
int bus_property_append_bool(Manager *m, DBusMessageIter *i, const char *property, void *data);
extern const DBusObjectPathVTable bus_manager_vtable;
extern const DBusObjectPathVTable bus_job_vtable;
extern const DBusObjectPathVTable bus_unit_vtable;
#endif

2
execute.c
View File

@ -551,7 +551,7 @@ void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
for (i = 0; i < RLIM_NLIMITS; i++)
if (c->rlimit[i])
fprintf(f, "%s: %llu\n", rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
if (c->ioprio_set)
fprintf(f,

2
execute.h
View File

@ -18,7 +18,7 @@ typedef struct ExecContext ExecContext;
#include "util.h"
/* Abstract namespace! */
#define LOGGER_SOCKET "/systemd/logger"
#define LOGGER_SOCKET "/org/freedesktop.org/systemd1/logger"
typedef enum ExecOutput {
EXEC_OUTPUT_CONSOLE,

11
job.c
View File

@ -463,6 +463,17 @@ void job_schedule_run(Job *j) {
j->in_run_queue = true;
}
char *job_dbus_path(Job *j) {
char *p;
assert(j);
if (asprintf(&p, "/org/freedesktop/systemd1/job/%lu", (unsigned long) j->id) < 0)
return NULL;
return p;
}
static const char* const job_state_table[_JOB_STATE_MAX] = {
[JOB_WAITING] = "waiting",
[JOB_RUNNING] = "running"

2
job.h
View File

@ -114,4 +114,6 @@ JobType job_type_from_string(const char *s);
const char* job_state_to_string(JobState t);
JobState job_state_from_string(const char *s);
char *job_dbus_path(Job *j);
#endif

6
main.c
View File

@ -1,5 +1,7 @@
/*-*- Mode: C; c-basic-offset: 8 -*-*/
#include <dbus/dbus.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
@ -16,7 +18,7 @@ int main(int argc, char *argv[]) {
assert_se(set_unit_path("test1") >= 0);
if (!(m = manager_new()) < 0) {
if (!(m = manager_new())) {
log_error("Failed to allocate manager object: %s", strerror(ENOMEM));
goto finish;
}
@ -55,5 +57,7 @@ finish:
log_debug("Exit.");
dbus_shutdown();
return retval;
}

58
manager.c
View File

@ -16,6 +16,7 @@
#include "strv.h"
#include "log.h"
#include "util.h"
#include "ratelimit.h"
static int manager_setup_signals(Manager *m) {
sigset_t mask;
@ -57,6 +58,7 @@ Manager* manager_new(void) {
return NULL;
m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = -1;
m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
if (!(m->units = hashmap_new(string_hash_func, string_compare_func)))
goto fail;
@ -76,6 +78,10 @@ Manager* manager_new(void) {
if (manager_setup_signals(m) < 0)
goto fail;
/* FIXME: this should be called only when the D-Bus bus daemon is running */
if (bus_init(m) < 0)
goto fail;
return m;
fail:
@ -100,6 +106,8 @@ void manager_free(Manager *m) {
if (unit_vtable[c]->shutdown)
unit_vtable[c]->shutdown(m);
bus_done(m);
hashmap_free(m->units);
hashmap_free(m->jobs);
hashmap_free(m->transaction_jobs);
@ -1137,7 +1145,7 @@ static int process_event(Manager *m, struct epoll_event *ev, bool *quit) {
case WATCH_FD:
/* Some fd event, to be dispatched to the units */
UNIT_VTABLE(w->unit)->fd_event(w->unit, w->fd, ev->events, w);
UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w);
break;
case WATCH_TIMER: {
@ -1153,7 +1161,7 @@ static int process_event(Manager *m, struct epoll_event *ev, bool *quit) {
return k < 0 ? -errno : -EIO;
}
UNIT_VTABLE(w->unit)->timer_event(w->unit, v, w);
UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w);
break;
}
@ -1167,6 +1175,14 @@ static int process_event(Manager *m, struct epoll_event *ev, bool *quit) {
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.");
}
@ -1178,14 +1194,27 @@ int manager_loop(Manager *m) {
int r;
bool quit = false;
RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000);
assert(m);
for (;;) {
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);
}
manager_dispatch_run_queue(m);
if (m->request_bus_dispatch) {
bus_dispatch(m);
continue;
}
if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) {
if (errno == -EINTR)
@ -1203,3 +1232,28 @@ int manager_loop(Manager *m) {
return 0;
}
}
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;
}

23
manager.h
View File

@ -7,6 +7,8 @@
#include <inttypes.h>
#include <stdio.h>
#include <dbus/dbus.h>
typedef struct Manager Manager;
typedef enum WatchType WatchType;
typedef struct Watch Watch;
@ -17,13 +19,20 @@ enum WatchType {
WATCH_FD,
WATCH_TIMER,
WATCH_MOUNT,
WATCH_UDEV
WATCH_UDEV,
WATCH_DBUS_WATCH,
WATCH_DBUS_TIMEOUT
};
struct Watch {
int fd;
WatchType type;
union Unit *unit;
bool fd_is_dupped;
union {
union Unit *unit;
DBusWatch *bus_watch;
DBusTimeout *bus_timeout;
} data;
};
#include "unit.h"
@ -31,6 +40,7 @@ struct Watch {
#include "hashmap.h"
#include "list.h"
#include "set.h"
#include "dbus.h"
#define SPECIAL_DEFAULT_TARGET "default.target"
#define SPECIAL_SYSLOG_SERVICE "syslog.service"
@ -67,6 +77,10 @@ struct Manager {
bool dispatching_load_queue:1;
bool dispatching_run_queue:1;
bool is_init:1;
bool request_bus_dispatch:1;
Hashmap *watch_pids; /* pid => Unit object n:1 */
int epoll_fd;
@ -81,6 +95,9 @@ struct Manager {
/* Data specific to the mount subsystem */
FILE *proc_self_mountinfo;
Watch mount_watch;
/* Data specific to the D-Bus subsystem */
DBusConnection *bus;
};
Manager* manager_new(void);
@ -91,6 +108,8 @@ int manager_coldplug(Manager *m);
Job *manager_get_job(Manager *m, uint32_t id);
Unit *manager_get_unit(Manager *m, const char *name);
int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u);
int manager_load_unit(Manager *m, const char *path_or_name, Unit **_ret);
int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool force, Job **_ret);

36
unit.c
View File

@ -707,7 +707,7 @@ int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
assert(u);
assert(fd >= 0);
assert(w);
assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->unit == u));
assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
zero(ev);
ev.data.ptr = w;
@ -721,7 +721,7 @@ int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
w->fd = fd;
w->type = WATCH_FD;
w->unit = u;
w->data.unit = u;
return 0;
}
@ -733,12 +733,13 @@ void unit_unwatch_fd(Unit *u, Watch *w) {
if (w->type == WATCH_INVALID)
return;
assert(w->type == WATCH_FD && w->unit == u);
assert(w->type == WATCH_FD);
assert(w->data.unit == u);
assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
w->fd = -1;
w->type = WATCH_INVALID;
w->unit = NULL;
w->data.unit = NULL;
}
int unit_watch_pid(Unit *u, pid_t pid) {
@ -762,7 +763,7 @@ int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
assert(u);
assert(w);
assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->unit == u));
assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
/* This will try to reuse the old timer if there is one */
@ -806,13 +807,13 @@ int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
w->fd = fd;
w->type = WATCH_TIMER;
w->unit = u;
w->data.unit = u;
return 0;
fail:
if (ours)
assert_se(close_nointr(fd) == 0);
close_nointr_nofail(fd);
return -errno;
}
@ -824,14 +825,14 @@ void unit_unwatch_timer(Unit *u, Watch *w) {
if (w->type == WATCH_INVALID)
return;
assert(w->type == WATCH_TIMER && w->unit == u);
assert(w->type == WATCH_TIMER && w->data.unit == u);
assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
assert_se(close_nointr(w->fd) == 0);
w->fd = -1;
w->type = WATCH_INVALID;
w->unit = NULL;
w->data.unit = NULL;
}
bool unit_job_is_applicable(Unit *u, JobType j) {
@ -1004,6 +1005,23 @@ char *unit_name_escape_path(const char *prefix, const char *path, const char *su
return r;
}
char *unit_dbus_path(Unit *u) {
char *p, *e;
assert(u);
if (!(e = bus_path_escape(unit_id(u))))
return NULL;
if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
free(e);
return NULL;
}
free(e);
return p;
}
static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
[UNIT_SERVICE] = "service",
[UNIT_TIMER] = "timer",

2
unit.h
View File

@ -274,4 +274,6 @@ UnitActiveState unit_active_state_from_string(const char *s);
const char *unit_dependency_to_string(UnitDependency i);
UnitDependency unit_dependency_from_string(const char *s);
char *unit_dbus_path(Unit *u);
#endif

64
util.c
View File

@ -566,10 +566,10 @@ int unhexchar(char c) {
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a';
return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
return c - 'A';
return c - 'A' + 10;
return -1;
}
@ -803,6 +803,66 @@ char *xescape(const char *s, const char *bad) {
return r;
}
char *bus_path_escape(const char *s) {
assert(s);
char *r, *t;
const char *f;
/* Escapes all chars that D-Bus' object path cannot deal
* with. Can be reverse with bus_path_unescape() */
if (!(r = new(char, strlen(s)*3+1)))
return NULL;
for (f = s, t = r; *f; f++) {
if (!(*f >= 'A' && *f <= 'Z') &&
!(*f >= 'a' && *f <= 'z') &&
!(*f >= '0' && *f <= '9')) {
*(t++) = '_';
*(t++) = hexchar(*f >> 4);
*(t++) = hexchar(*f);
} else
*(t++) = *f;
}
*t = 0;
return r;
}
char *bus_path_unescape(const char *s) {
assert(s);
char *r, *t;
const char *f;
if (!(r = new(char, strlen(s)+1)))
return NULL;
for (f = s, t = r; *f; f++) {
if (*f == '_') {
int a, b;
if ((a = unhexchar(f[1])) < 0 ||
(b = unhexchar(f[2])) < 0) {
/* Invalid escape code, let's take it literal then */
*(t++) = '_';
} else {
*(t++) = (char) ((a << 4) | b);
f += 2;
}
} else
*(t++) = *f;
}
*t = 0;
return r;
}
char *path_kill_slashes(char *path) {
char *f, *t;
bool slash = false;

3
util.h
View File

@ -121,6 +121,9 @@ char *ascii_strlower(char *path);
char *xescape(const char *s, const char *bad);
char *bus_path_escape(const char *s);
char *bus_path_unescape(const char *s);
#define DEFINE_STRING_TABLE_LOOKUP(name,type) \
const char *name##_to_string(type i) { \
if (i < 0 || i >= (type) ELEMENTSOF(name##_table)) \