#include <sys/inotify.h>
#include <sys/epoll.h>
-#include <sys/ioctl.h>
#include <errno.h>
#include <unistd.h>
#include "mkdir.h"
#include "dbus-path.h"
#include "special.h"
-#include "bus-errors.h"
-#include "path-util.h"
#include "macro.h"
+#include "bus-util.h"
+#include "bus-error.h"
static const UnitActiveState state_translation_table[_PATH_STATE_MAX] = {
[PATH_DEAD] = UNIT_INACTIVE,
[PATH_FAILED] = UNIT_FAILED
};
-int path_spec_watch(PathSpec *s, Unit *u) {
+static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
+
+int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler) {
static const int flags_table[_PATH_TYPE_MAX] = {
[PATH_EXISTS] = IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB,
};
bool exists = false;
- char _cleanup_free_ *path = NULL;
char *slash, *oldslash = NULL;
int r;
- assert(u);
assert(s);
+ assert(s->unit);
+ assert(handler);
- path_spec_unwatch(s, u);
-
- path = strdup(s->path);
- if (!path)
- return -ENOMEM;
+ path_spec_unwatch(s);
s->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
if (s->inotify_fd < 0) {
goto fail;
}
- r = unit_watch_fd(u, s->inotify_fd, EPOLLIN, &s->watch);
+ r = sd_event_add_io(s->unit->manager->event, &s->event_source, s->inotify_fd, EPOLLIN, handler, s);
if (r < 0)
goto fail;
/* This assumes the path was passed through path_kill_slashes()! */
- for(slash = strchr(path, '/'); ; slash = strchr(slash+1, '/')) {
+ for (slash = strchr(s->path, '/'); ; slash = strchr(slash+1, '/')) {
+ char *cut = NULL;
int flags;
char tmp;
if (slash) {
- tmp = slash[slash == path];
- slash[slash == path] = '\0';
+ cut = slash + (slash == s->path);
+ tmp = *cut;
+ *cut = '\0';
+
flags = IN_MOVE_SELF | IN_DELETE_SELF | IN_ATTRIB | IN_CREATE | IN_MOVED_TO;
- } else {
+ } else
flags = flags_table[s->type];
- }
- r = inotify_add_watch(s->inotify_fd, path, flags);
+ r = inotify_add_watch(s->inotify_fd, s->path, flags);
if (r < 0) {
- if (errno == EACCES || errno == ENOENT)
+ if (errno == EACCES || errno == ENOENT) {
+ if (cut)
+ *cut = tmp;
break;
+ }
- log_warning("Failed to add watch on %s: %m", path);
+ log_warning("Failed to add watch on %s: %s", s->path,
+ errno == ENOSPC ? "too many watches" : strerror(-r));
r = -errno;
+ if (cut)
+ *cut = tmp;
goto fail;
} else {
exists = true;
/* Path exists, we don't need to watch parent
too closely. */
if (oldslash) {
- char tmp2 = oldslash[oldslash == path];
- oldslash[oldslash == path] = '\0';
+ char *cut2 = oldslash + (oldslash == s->path);
+ char tmp2 = *cut2;
+ *cut2 = '\0';
- inotify_add_watch(s->inotify_fd, path, IN_MOVE_SELF);
+ inotify_add_watch(s->inotify_fd, s->path, IN_MOVE_SELF);
/* Error is ignored, the worst can happen is
we get spurious events. */
- oldslash[oldslash == path] = tmp2;
+ *cut2 = tmp2;
}
}
- if (slash) {
- slash[slash == path] = tmp;
+ if (cut)
+ *cut = tmp;
+
+ if (slash)
oldslash = slash;
- } else {
+ else {
/* whole path has been iterated over */
s->primary_wd = r;
break;
}
}
- assert(errno == EACCES || errno == ENOENT || streq(path, s->path));
-
if (!exists) {
- log_error("Failed to add watch on any of the components of %s: %m",
+ log_error_errno(errno, "Failed to add watch on any of the components of %s: %m",
s->path);
r = -errno; /* either EACCESS or ENOENT */
goto fail;
return 0;
fail:
- path_spec_unwatch(s, u);
+ path_spec_unwatch(s);
return r;
}
-void path_spec_unwatch(PathSpec *s, Unit *u) {
-
- if (s->inotify_fd < 0)
- return;
-
- unit_unwatch_fd(u, &s->watch);
+void path_spec_unwatch(PathSpec *s) {
+ assert(s);
- close_nointr_nofail(s->inotify_fd);
- s->inotify_fd = -1;
+ s->event_source = sd_event_source_unref(s->event_source);
+ s->inotify_fd = safe_close(s->inotify_fd);
}
-int path_spec_fd_event(PathSpec *s, uint32_t events) {
- uint8_t _cleanup_free_ *buf = NULL;
+int path_spec_fd_event(PathSpec *s, uint32_t revents) {
+ union inotify_event_buffer buffer;
struct inotify_event *e;
- ssize_t k;
- int l;
+ ssize_t l;
int r = 0;
- if (events != EPOLLIN) {
+ if (revents != EPOLLIN) {
log_error("Got invalid poll event on inotify.");
return -EINVAL;
}
- if (ioctl(s->inotify_fd, FIONREAD, &l) < 0) {
- log_error("FIONREAD failed: %m");
- return -errno;
- }
-
- assert(l > 0);
+ l = read(s->inotify_fd, &buffer, sizeof(buffer));
+ if (l < 0) {
+ if (errno == EAGAIN || errno == EINTR)
+ return 0;
- buf = malloc(l);
- if (!buf)
- return log_oom();
-
- k = read(s->inotify_fd, buf, l);
- if (k < 0) {
- log_error("Failed to read inotify event: %m");
- return -errno;
+ return log_error_errno(errno, "Failed to read inotify event: %m");
}
- e = (struct inotify_event*) buf;
-
- while (k > 0) {
- size_t step;
-
+ FOREACH_INOTIFY_EVENT(e, buffer, l) {
if ((s->type == PATH_CHANGED || s->type == PATH_MODIFIED) &&
s->primary_wd == e->wd)
r = 1;
-
- step = sizeof(struct inotify_event) + e->len;
- assert(step <= (size_t) k);
-
- e = (struct inotify_event*) ((uint8_t*) e + step);
- k -= step;
}
return r;
return good;
}
-static bool path_spec_startswith(PathSpec *s, const char *what) {
- return path_startswith(s->path, what);
-}
-
static void path_spec_mkdir(PathSpec *s, mode_t mode) {
int r;
r = mkdir_p_label(s->path, mode);
if (r < 0)
- log_warning("mkdir(%s) failed: %s", s->path, strerror(-r));
+ log_warning_errno(r, "mkdir(%s) failed: %m", s->path);
}
static void path_spec_dump(PathSpec *s, FILE *f, const char *prefix) {
assert(p);
while ((s = p->specs)) {
- path_spec_unwatch(s, UNIT(p));
- LIST_REMOVE(PathSpec, spec, p->specs, s);
+ path_spec_unwatch(s);
+ LIST_REMOVE(spec, p->specs, s);
path_spec_done(s);
free(s);
}
assert(p);
- unit_ref_unset(&p->unit);
path_free_specs(p);
}
-int path_add_one_mount_link(Path *p, Mount *m) {
+static int path_add_mount_links(Path *p) {
PathSpec *s;
int r;
assert(p);
- assert(m);
-
- if (UNIT(p)->load_state != UNIT_LOADED ||
- UNIT(m)->load_state != UNIT_LOADED)
- return 0;
LIST_FOREACH(spec, s, p->specs) {
- if (!path_spec_startswith(s, m->where))
- continue;
-
- r = unit_add_two_dependencies(UNIT(p), UNIT_AFTER, UNIT_REQUIRES,
- UNIT(m), true);
- if (r < 0)
- return r;
- }
-
- return 0;
-}
-
-static int path_add_mount_links(Path *p) {
- Unit *other;
- int r;
-
- assert(p);
-
- LIST_FOREACH(units_by_type, other, UNIT(p)->manager->units_by_type[UNIT_MOUNT]) {
- r = path_add_one_mount_link(p, MOUNT(other));
+ r = unit_require_mounts_for(UNIT(p), s->path);
if (r < 0)
return r;
}
return 0;
if (!p->specs) {
- log_error_unit(UNIT(p)->id,
+ log_unit_error(UNIT(p)->id,
"%s lacks path setting. Refusing.", UNIT(p)->id);
return -EINVAL;
}
assert(p);
- if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) {
- r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE,
- SPECIAL_BASIC_TARGET, NULL, true);
- if (r < 0)
- return r;
+ r = unit_add_dependency_by_name(UNIT(p), UNIT_BEFORE,
+ SPECIAL_PATHS_TARGET, NULL, true);
+ if (r < 0)
+ return r;
+ if (UNIT(p)->manager->running_as == SYSTEMD_SYSTEM) {
r = unit_add_two_dependencies_by_name(UNIT(p), UNIT_AFTER, UNIT_REQUIRES,
SPECIAL_SYSINIT_TARGET, NULL, true);
if (r < 0)
if (u->load_state == UNIT_LOADED) {
- if (!UNIT_DEREF(p->unit)) {
+ if (set_isempty(u->dependencies[UNIT_TRIGGERS])) {
Unit *x;
r = unit_load_related_unit(u, ".service", &x);
if (r < 0)
return r;
- unit_ref_set(&p->unit, x);
+ r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, x, true);
+ if (r < 0)
+ return r;
}
- r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS,
- UNIT_DEREF(p->unit), true);
- if (r < 0)
- return r;
-
r = path_add_mount_links(p);
if (r < 0)
return r;
static void path_dump(Unit *u, FILE *f, const char *prefix) {
Path *p = PATH(u);
+ Unit *trigger;
PathSpec *s;
assert(p);
assert(f);
+ trigger = UNIT_TRIGGER(u);
+
fprintf(f,
"%sPath State: %s\n"
"%sResult: %s\n"
"%sDirectoryMode: %04o\n",
prefix, path_state_to_string(p->state),
prefix, path_result_to_string(p->result),
- prefix, UNIT_DEREF(p->unit)->id,
+ prefix, trigger ? trigger->id : "n/a",
prefix, yes_no(p->make_directory),
prefix, p->directory_mode);
assert(p);
LIST_FOREACH(spec, s, p->specs)
- path_spec_unwatch(s, UNIT(p));
+ path_spec_unwatch(s);
}
static int path_watch(Path *p) {
assert(p);
LIST_FOREACH(spec, s, p->specs) {
- r = path_spec_watch(s, UNIT(p));
+ r = path_spec_watch(s, path_dispatch_io);
if (r < 0)
return r;
}
}
static void path_enter_running(Path *p) {
+ _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
- DBusError error;
assert(p);
- dbus_error_init(&error);
/* Don't start job if we are supposed to go down */
- if (UNIT(p)->job && UNIT(p)->job->type == JOB_STOP)
+ if (unit_stop_pending(UNIT(p)))
return;
- r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_DEREF(p->unit),
+ r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_TRIGGER(UNIT(p)),
JOB_REPLACE, true, &error, NULL);
if (r < 0)
goto fail;
fail:
log_warning("%s failed to queue unit startup job: %s",
- UNIT(p)->id, bus_error(&error, r));
+ UNIT(p)->id, bus_error_message(&error, r));
path_enter_dead(p, PATH_FAILURE_RESOURCES);
-
- dbus_error_free(&error);
}
static bool path_check_good(Path *p, bool initial) {
return;
fail:
- log_warning("%s failed to enter waiting state: %s",
- UNIT(p)->id, strerror(-r));
+ log_warning_errno(r, "%s failed to enter waiting state: %m", UNIT(p)->id);
path_enter_dead(p, PATH_FAILURE_RESOURCES);
}
assert(p);
assert(p->state == PATH_DEAD || p->state == PATH_FAILED);
- if (UNIT_DEREF(p->unit)->load_state != UNIT_LOADED)
+ if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED)
return -ENOENT;
path_mkdir(p);
p->result = PATH_SUCCESS;
path_enter_waiting(p, true, true);
- return 0;
+ return 1;
}
static int path_stop(Unit *u) {
assert(p->state == PATH_WAITING || p->state == PATH_RUNNING);
path_enter_dead(p, PATH_SUCCESS);
- return 0;
+ return 1;
}
static int path_serialize(Unit *u, FILE *f, FDSet *fds) {
return 0;
}
-static UnitActiveState path_active_state(Unit *u) {
+_pure_ static UnitActiveState path_active_state(Unit *u) {
assert(u);
return state_translation_table[PATH(u)->state];
}
-static const char *path_sub_state_to_string(Unit *u) {
+_pure_ static const char *path_sub_state_to_string(Unit *u) {
assert(u);
return path_state_to_string(PATH(u)->state);
}
-static void path_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
- Path *p = PATH(u);
- PathSpec *s;
+static int path_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
+ PathSpec *s = userdata;
+ Path *p;
int changed;
- assert(p);
+ assert(s);
+ assert(s->unit);
assert(fd >= 0);
+ p = PATH(s->unit);
+
if (p->state != PATH_WAITING &&
p->state != PATH_RUNNING)
- return;
+ return 0;
/* log_debug("inotify wakeup on %s.", u->id); */
goto fail;
}
- changed = path_spec_fd_event(s, events);
+ changed = path_spec_fd_event(s, revents);
if (changed < 0)
goto fail;
else
path_enter_waiting(p, false, true);
- return;
+ return 0;
fail:
path_enter_dead(p, PATH_FAILURE_RESOURCES);
+ return 0;
}
-void path_unit_notify(Unit *u, UnitActiveState new_state) {
- Iterator i;
- Unit *k;
-
- if (u->type == UNIT_PATH)
- return;
-
- SET_FOREACH(k, u->dependencies[UNIT_TRIGGERED_BY], i) {
- Path *p;
+static void path_trigger_notify(Unit *u, Unit *other) {
+ Path *p = PATH(u);
- if (k->type != UNIT_PATH)
- continue;
+ assert(u);
+ assert(other);
- if (k->load_state != UNIT_LOADED)
- continue;
+ /* Invoked whenever the unit we trigger changes state or gains
+ * or loses a job */
- p = PATH(k);
+ if (other->load_state != UNIT_LOADED)
+ return;
- if (p->state == PATH_RUNNING && new_state == UNIT_INACTIVE) {
- log_debug("%s got notified about unit deactivation.",
- UNIT(p)->id);
+ if (p->state == PATH_RUNNING &&
+ UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other))) {
+ log_unit_debug(UNIT(p)->id,
+ "%s got notified about unit deactivation.",
+ UNIT(p)->id);
- /* Hmm, so inotify was triggered since the
- * last activation, so I guess we need to
- * recheck what is going on. */
- path_enter_waiting(p, false, p->inotify_triggered);
- }
+ /* Hmm, so inotify was triggered since the
+ * last activation, so I guess we need to
+ * recheck what is going on. */
+ path_enter_waiting(p, false, p->inotify_triggered);
}
}
static const char* const path_type_table[_PATH_TYPE_MAX] = {
[PATH_EXISTS] = "PathExists",
[PATH_EXISTS_GLOB] = "PathExistsGlob",
+ [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty",
[PATH_CHANGED] = "PathChanged",
[PATH_MODIFIED] = "PathModified",
- [PATH_DIRECTORY_NOT_EMPTY] = "DirectoryNotEmpty"
};
DEFINE_STRING_TABLE_LOOKUP(path_type, PathType);
static const char* const path_result_table[_PATH_RESULT_MAX] = {
[PATH_SUCCESS] = "success",
- [PATH_FAILURE_RESOURCES] = "resources"
+ [PATH_FAILURE_RESOURCES] = "resources",
};
DEFINE_STRING_TABLE_LOOKUP(path_result, PathResult);
const UnitVTable path_vtable = {
.object_size = sizeof(Path),
+
.sections =
"Unit\0"
"Path\0"
.active_state = path_active_state,
.sub_state_to_string = path_sub_state_to_string,
- .fd_event = path_fd_event,
+ .trigger_notify = path_trigger_notify,
.reset_failed = path_reset_failed,
.bus_interface = "org.freedesktop.systemd1.Path",
- .bus_message_handler = bus_path_message_handler,
- .bus_invalidating_properties = bus_path_invalidating_properties
+ .bus_vtable = bus_path_vtable
};
~ianmdlvl / elogind.git / blobdiff