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-rw-r--r--src/modules/reserve-monitor.c259
-rw-r--r--src/modules/reserve-monitor.h62
-rw-r--r--src/modules/reserve-wrap.c149
-rw-r--r--src/modules/reserve-wrap.h9
4 files changed, 477 insertions, 2 deletions
diff --git a/src/modules/reserve-monitor.c b/src/modules/reserve-monitor.c
new file mode 100644
index 00000000..64d2a7cc
--- /dev/null
+++ b/src/modules/reserve-monitor.c
@@ -0,0 +1,259 @@
+/***
+ Copyright 2009 Lennart Poettering
+
+ Permission is hereby granted, free of charge, to any person
+ obtaining a copy of this software and associated documentation files
+ (the "Software"), to deal in the Software without restriction,
+ including without limitation the rights to use, copy, modify, merge,
+ publish, distribute, sublicense, and/or sell copies of the Software,
+ and to permit persons to whom the Software is furnished to do so,
+ subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.
+***/
+
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <assert.h>
+
+#include "reserve-monitor.h"
+
+struct rm_monitor {
+ int ref;
+
+ char *device_name;
+ char *service_name;
+
+ DBusConnection *connection;
+
+ unsigned busy:1;
+ unsigned filtering:1;
+ unsigned matching:1;
+
+ rm_change_cb_t change_cb;
+ void *userdata;
+};
+
+#define SERVICE_PREFIX "org.freedesktop.ReserveDevice1."
+
+static DBusHandlerResult filter_handler(
+ DBusConnection *c,
+ DBusMessage *s,
+ void *userdata) {
+
+ DBusMessage *reply;
+ rm_monitor *m;
+ DBusError error;
+
+ dbus_error_init(&error);
+
+ m = userdata;
+ assert(m->ref >= 1);
+
+ if (dbus_message_is_signal(s, "org.freedesktop.DBus", "NameOwnerChanged")) {
+ const char *name, *old, *new;
+
+ if (!dbus_message_get_args(
+ s,
+ &error,
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_STRING, &old,
+ DBUS_TYPE_STRING, &new,
+ DBUS_TYPE_INVALID))
+ goto invalid;
+
+ if (strcmp(name, m->service_name) == 0) {
+
+ m->busy = !!(new && *new);
+
+ if (m->change_cb) {
+ m->ref++;
+ m->change_cb(m);
+ rm_release(m);
+ }
+ }
+ }
+
+ return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+
+invalid:
+ if (!(reply = dbus_message_new_error(
+ s,
+ DBUS_ERROR_INVALID_ARGS,
+ "Invalid arguments")))
+ goto oom;
+
+ if (!dbus_connection_send(c, reply, NULL))
+ goto oom;
+
+ dbus_message_unref(reply);
+
+ dbus_error_free(&error);
+
+ return DBUS_HANDLER_RESULT_HANDLED;
+
+oom:
+ if (reply)
+ dbus_message_unref(reply);
+
+ dbus_error_free(&error);
+
+ return DBUS_HANDLER_RESULT_NEED_MEMORY;
+}
+
+int rm_watch(
+ rm_monitor **_m,
+ DBusConnection *connection,
+ const char*device_name,
+ rm_change_cb_t change_cb,
+ DBusError *error) {
+
+ rm_monitor *m = NULL;
+ int r;
+ DBusError _error;
+
+ if (!error)
+ error = &_error;
+
+ dbus_error_init(error);
+
+ if (!_m)
+ return -EINVAL;
+
+ if (!connection)
+ return -EINVAL;
+
+ if (!device_name)
+ return -EINVAL;
+
+ if (!(m = calloc(sizeof(rm_monitor), 1)))
+ return -ENOMEM;
+
+ m->ref = 1;
+
+ if (!(m->device_name = strdup(device_name))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ m->connection = dbus_connection_ref(connection);
+ m->change_cb = change_cb;
+
+ if (!(m->service_name = malloc(sizeof(SERVICE_PREFIX) + strlen(device_name)))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+ sprintf(m->service_name, SERVICE_PREFIX "%s", m->device_name);
+
+ if (!(dbus_connection_add_filter(m->connection, filter_handler, m, NULL))) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ m->filtering = 1;
+
+ dbus_bus_add_match(m->connection,
+ "type='signal',"
+ "sender='" DBUS_SERVICE_DBUS "',"
+ "interface='" DBUS_INTERFACE_DBUS "',"
+ "member='NameOwnerChanged'", error);
+
+ if (dbus_error_is_set(error)) {
+ r = -EIO;
+ goto fail;
+ }
+
+ m->matching = 1;
+
+ m->busy = dbus_bus_name_has_owner(m->connection, m->service_name, error);
+
+ if (dbus_error_is_set(error)) {
+ r = -EIO;
+ goto fail;
+ }
+
+ *_m = m;
+ return 0;
+
+fail:
+ if (&_error == error)
+ dbus_error_free(&_error);
+
+ if (m)
+ rm_release(m);
+
+ return r;
+}
+
+void rm_release(rm_monitor *m) {
+ if (!m)
+ return;
+
+ assert(m->ref > 0);
+
+ if (--m->ref > 0)
+ return;
+
+ if (m->matching)
+ dbus_bus_remove_match(
+ m->connection,
+ "type='signal',"
+ "sender='" DBUS_SERVICE_DBUS "',"
+ "interface='" DBUS_INTERFACE_DBUS "',"
+ "member='NameOwnerChanged'", NULL);
+
+ if (m->filtering)
+ dbus_connection_remove_filter(
+ m->connection,
+ filter_handler,
+ m);
+
+ free(m->device_name);
+ free(m->service_name);
+
+ if (m->connection)
+ dbus_connection_unref(m->connection);
+
+ free(m);
+}
+
+int rm_busy(rm_monitor *m) {
+ if (!m)
+ return -EINVAL;
+
+ assert(m->ref > 0);
+
+ return m->busy;
+}
+
+void rm_set_userdata(rm_monitor *m, void *userdata) {
+
+ if (!m)
+ return;
+
+ assert(m->ref > 0);
+ m->userdata = userdata;
+}
+
+void* rm_get_userdata(rm_monitor *m) {
+
+ if (!m)
+ return NULL;
+
+ assert(m->ref > 0);
+
+ return m->userdata;
+}
diff --git a/src/modules/reserve-monitor.h b/src/modules/reserve-monitor.h
new file mode 100644
index 00000000..4f4a8332
--- /dev/null
+++ b/src/modules/reserve-monitor.h
@@ -0,0 +1,62 @@
+#ifndef fooreservemonitorhfoo
+#define fooreservemonitorhfoo
+
+/***
+ Copyright 2009 Lennart Poettering
+
+ Permission is hereby granted, free of charge, to any person
+ obtaining a copy of this software and associated documentation files
+ (the "Software"), to deal in the Software without restriction,
+ including without limitation the rights to use, copy, modify, merge,
+ publish, distribute, sublicense, and/or sell copies of the Software,
+ and to permit persons to whom the Software is furnished to do so,
+ subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.
+***/
+
+#include <dbus/dbus.h>
+#include <inttypes.h>
+
+typedef struct rm_monitor rm_monitor;
+
+/* Prototype for a function that is called whenever the reservation
+ * device of a device changes. Use rm_monitor_busy() to find out the
+ * new state.*/
+typedef void (*rm_change_cb_t)(rm_monitor *m);
+
+/* Creates a monitor for watching the lock status of a device. Returns
+ * 0 on success, a negative errno style return value on error. The
+ * DBus error might be set as well if the error was caused D-Bus. */
+int rm_watch(
+ rm_monitor **m, /* On success a pointer to the newly allocated rm_device object will be filled in here */
+ DBusConnection *connection, /* Session bus (when D-Bus learns about user busses we should switchg to user busses) */
+ const char *device_name, /* The device to monitor, e.g. "Audio0" */
+ rm_change_cb_t change_cb, /* Will be called whenever the lock status changes. May be NULL */
+ DBusError *error); /* If we fail due to a D-Bus related issue the error will be filled in here. May be NULL. */
+
+/* Free a rm_monitor object */
+void rm_release(rm_monitor *m);
+
+/* Checks whether the device is currently reserved, and returns 1
+ * then, 0 if not, negative errno style error code value on error. */
+int rm_busy(rm_monitor *m);
+
+/* Attach a userdata pointer to an rm_monitor */
+void rm_set_userdata(rm_monitor *m, void *userdata);
+
+/* Query the userdata pointer from an rm_monitor. Returns NULL if no
+ * userdata was set. */
+void* rm_get_userdata(rm_monitor *m);
+
+#endif
diff --git a/src/modules/reserve-wrap.c b/src/modules/reserve-wrap.c
index d0d014d3..07b592d3 100644
--- a/src/modules/reserve-wrap.c
+++ b/src/modules/reserve-wrap.c
@@ -35,6 +35,7 @@
#ifdef HAVE_DBUS
#include <pulsecore/dbus-shared.h>
#include "reserve.h"
+#include "reserve-monitor.h"
#endif
#include "reserve-wrap.h"
@@ -50,6 +51,17 @@ struct pa_reserve_wrapper {
#endif
};
+struct pa_reserve_monitor_wrapper {
+ PA_REFCNT_DECLARE;
+ pa_core *core;
+ pa_hook hook;
+ char *shared_name;
+#ifdef HAVE_DBUS
+ pa_dbus_connection *connection;
+ struct rm_monitor *monitor;
+#endif
+};
+
static void reserve_wrapper_free(pa_reserve_wrapper *r) {
pa_assert(r);
@@ -83,7 +95,7 @@ static int request_cb(rd_device *d, int forced) {
PA_REFCNT_INC(r);
k = pa_hook_fire(&r->hook, PA_INT_TO_PTR(forced));
- pa_log_debug("Device unlock has been requested and %s.", k < 0 ? "failed" : "succeeded");
+ pa_log_debug("Device unlock of %s has been requested and %s.", r->shared_name, k < 0 ? "failed" : "succeeded");
pa_reserve_wrapper_unref(r);
@@ -191,3 +203,138 @@ void pa_reserve_wrapper_set_application_device_name(pa_reserve_wrapper *r, const
rd_set_application_device_name(r->device, name);
#endif
}
+
+static void reserve_monitor_wrapper_free(pa_reserve_monitor_wrapper *w) {
+ pa_assert(w);
+
+#ifdef HAVE_DBUS
+ if (w->monitor)
+ rm_release(w->monitor);
+
+ if (w->connection)
+ pa_dbus_connection_unref(w->connection);
+#endif
+
+ pa_hook_done(&w->hook);
+
+ if (w->shared_name) {
+ pa_assert_se(pa_shared_remove(w->core, w->shared_name) >= 0);
+ pa_xfree(w->shared_name);
+ }
+
+ pa_xfree(w);
+}
+
+#ifdef HAVE_DBUS
+static void change_cb(rm_monitor *m) {
+ pa_reserve_monitor_wrapper *w;
+ int k;
+
+ pa_assert(m);
+ pa_assert_se(w = rm_get_userdata(m));
+ pa_assert(PA_REFCNT_VALUE(w) >= 1);
+
+ PA_REFCNT_INC(w);
+
+ if ((k = rm_busy(w->monitor)) < 0)
+ return;
+
+ pa_hook_fire(&w->hook, PA_INT_TO_PTR(!!k));
+ pa_log_debug("Device lock status of %s changed: %s", w->shared_name, k ? "busy" : "not busy");
+
+ pa_reserve_monitor_wrapper_unref(w);
+}
+#endif
+
+pa_reserve_monitor_wrapper* pa_reserve_monitor_wrapper_get(pa_core *c, const char *device_name) {
+ pa_reserve_monitor_wrapper *w;
+ int k;
+ char *t;
+#ifdef HAVE_DBUS
+ DBusError error;
+
+ dbus_error_init(&error);
+#endif
+
+ pa_assert(c);
+ pa_assert(device_name);
+
+ t = pa_sprintf_malloc("reserve-monitor-wrapper@%s", device_name);
+
+ if ((w = pa_shared_get(c, t))) {
+ pa_xfree(t);
+
+ pa_assert(PA_REFCNT_VALUE(w) >= 1);
+ PA_REFCNT_INC(w);
+
+ return w;
+ }
+
+ w = pa_xnew0(pa_reserve_monitor_wrapper, 1);
+ PA_REFCNT_INIT(w);
+ w->core = c;
+ pa_hook_init(&w->hook, w);
+ w->shared_name = t;
+
+ pa_assert_se(pa_shared_set(c, w->shared_name, w) >= 0);
+
+#ifdef HAVE_DBUS
+ if (!(w->connection = pa_dbus_bus_get(c, DBUS_BUS_SESSION, &error)) || dbus_error_is_set(&error)) {
+ pa_log_warn("Unable to contact D-Bus session bus: %s: %s", error.name, error.message);
+
+ /* We don't treat this as error here because we want allow PA
+ * to run even when no session bus is available. */
+ return w;
+ }
+
+ if ((k = rm_watch(
+ &w->monitor,
+ pa_dbus_connection_get(w->connection),
+ device_name,
+ change_cb,
+ NULL)) < 0) {
+
+ pa_log_warn("Failed to create watch on device '%s': %s", device_name, pa_cstrerror(-k));
+ goto fail;
+ }
+
+ pa_log_debug("Successfully create reservation lock monitor for device '%s'", device_name);
+
+ rm_set_userdata(w->monitor, w);
+ return w;
+
+fail:
+ dbus_error_free(&error);
+
+ reserve_monitor_wrapper_free(w);
+
+ return NULL;
+#else
+ return w;
+#endif
+}
+
+void pa_reserve_monitor_wrapper_unref(pa_reserve_monitor_wrapper *w) {
+ pa_assert(w);
+ pa_assert(PA_REFCNT_VALUE(w) >= 1);
+
+ if (PA_REFCNT_DEC(w) > 0)
+ return;
+
+ reserve_monitor_wrapper_free(w);
+}
+
+pa_hook* pa_reserve_monitor_wrapper_hook(pa_reserve_monitor_wrapper *w) {
+ pa_assert(w);
+ pa_assert(PA_REFCNT_VALUE(w) >= 1);
+
+ return &w->hook;
+}
+
+pa_bool_t pa_reserve_monitor_wrapper_busy(pa_reserve_monitor_wrapper *w) {
+ pa_assert(w);
+
+ pa_assert(PA_REFCNT_VALUE(w) >= 1);
+
+ return rm_busy(w->monitor) > 0;
+}
diff --git a/src/modules/reserve-wrap.h b/src/modules/reserve-wrap.h
index 2b97c91c..2de6c093 100644
--- a/src/modules/reserve-wrap.h
+++ b/src/modules/reserve-wrap.h
@@ -28,11 +28,18 @@
typedef struct pa_reserve_wrapper pa_reserve_wrapper;
pa_reserve_wrapper* pa_reserve_wrapper_get(pa_core *c, const char *device_name);
-
void pa_reserve_wrapper_unref(pa_reserve_wrapper *r);
pa_hook* pa_reserve_wrapper_hook(pa_reserve_wrapper *r);
void pa_reserve_wrapper_set_application_device_name(pa_reserve_wrapper *r, const char *name);
+typedef struct pa_reserve_monitor_wrapper pa_reserve_monitor_wrapper;
+
+pa_reserve_monitor_wrapper* pa_reserve_monitor_wrapper_get(pa_core *c, const char *device_name);
+void pa_reserve_monitor_wrapper_unref(pa_reserve_monitor_wrapper *m);
+
+pa_hook* pa_reserve_monitor_wrapper_hook(pa_reserve_monitor_wrapper *m);
+pa_bool_t pa_reserve_monitor_wrapper_busy(pa_reserve_monitor_wrapper *m);
+
#endif
generated by cgit (git 2.34.1) at 2024-11-16 10:23:00 +0000