static void ob_session_finalize(GObject *obj) { LOG_INFO("ob_session_finalize begin"); if (G_OBJECT_CLASS(ob_session_parent_class)->finalize) { LOG_INFO("session parent finalize"); G_OBJECT_CLASS(ob_session_parent_class)->finalize(obj); } LOG_INFO("ob_session_finalize end"); }这段代码会不会递归调用
时间: 2024-03-29 15:35:11 浏览: 14
不会递归调用。这是一个 GObject 类的 finalize 函数,它会在对象被销毁时自动调用。在这个函数中,首先会打印出 "ob_session_finalize begin",然后调用父类的 finalize 函数,接着打印 "session parent finalize",最后再打印 "ob_session_finalize end"。由于 GObject 类的 finalize 函数只会被调用一次,因此不会出现递归调用的情况。
相关问题
installation failed with message failed to finalize session : install_failed
安装失败,出现了错误消息“无法完成会话:安装失败”。这通常是由于多种原因造成的,比如设备存储空间不足、网络连接问题、应用程序的不兼容性或者是设备根本不支持该应用程序。
首先,我们需要确保设备的存储空间足够来安装应用程序。如果存储空间不足,可以删除一些不需要的文件或者应用程序来腾出空间。此外,也要确保设备的网络连接稳定,因为安装过程可能需要下载一些文件来完成。尝试连接到一个稳定的Wi-Fi网络来再次尝试安装应用程序。
另外,如果应用程序是最新版本,可能会出现与设备不兼容的问题。尝试更新设备的操作系统或者等待应用程序的更新来解决这个问题。如果以上方法都不能解决问题,可能需要考虑设备是否支持该应用程序。部分应用可能对设备型号或者操作系统版本有特定要求,如果设备不满足这些要求,可能无法安装。
总之,安装失败的问题可能有多种原因,需要根据具体的情况来进行排查和解决。如果以上方法都无法解决问题,可能需要向应用程序的开发者寻求帮助或者尝试在其他设备上安装应用程序。
g_uevent_device_new 代码举例
以下是一个简单的 g_uevent_device_new 函数实现的示例代码:
```c
#include <glib.h>
#include <gio/gio.h>
#define UEVENT_BUFFER_SIZE 2048
typedef struct _GUeventDevice GUeventDevice;
struct _GUeventDevice {
GObject parent_instance;
gchar *syspath;
gchar *subsystem;
gchar *devtype;
gchar **filters;
GRegex **regex_filters;
guint n_filters;
GIOChannel *io_channel;
guint io_watch_id;
gchar io_buffer[UEVENT_BUFFER_SIZE];
};
G_DEFINE_TYPE(GUeventDevice, g_uevent_device, G_TYPE_OBJECT);
static gboolean
g_uevent_device_io_watch_callback(GIOChannel *channel, GIOCondition condition,
gpointer user_data)
{
GUeventDevice *self = G_UEVENT_DEVICE(user_data);
if (condition & G_IO_IN) {
gsize bytes_read = 0;
gsize io_buffer_size = sizeof(self->io_buffer) - 1;
if (g_io_channel_read_chars(channel, self->io_buffer, io_buffer_size,
&bytes_read, NULL) != G_IO_ERROR_NONE) {
g_warning("Failed to read from uevent device");
return G_SOURCE_REMOVE;
}
/* Null-terminate the read buffer */
self->io_buffer[bytes_read] = '\0';
/* Process the uevent messages in the buffer */
gchar *line_start = self->io_buffer;
gchar *line_end = NULL;
while ((line_end = strchr(line_start, '\n'))) {
*line_end = '\0';
gchar **kv_pairs = g_strsplit(line_start, "=", -1);
/* Process the key-value pairs in the uevent message */
for (guint i = 0; kv_pairs[i]; i += 2) {
gchar *key = kv_pairs[i];
gchar *value = kv_pairs[i + 1];
/* Filter out the key-value pairs that don't match any of the
regex filters */
gboolean filter_match = FALSE;
for (guint j = 0; j < self->n_filters; j++) {
if (g_regex_match(self->regex_filters[j], key, 0, NULL)) {
filter_match = TRUE;
break;
}
}
if (!filter_match) {
continue;
}
g_message("Received uevent message: %s=%s", key, value);
}
g_strfreev(kv_pairs);
line_start = line_end + 1;
}
}
return G_SOURCE_CONTINUE;
}
static void
g_uevent_device_init(GUeventDevice *self)
{
self->syspath = NULL;
self->subsystem = NULL;
self->devtype = NULL;
self->filters = NULL;
self->regex_filters = NULL;
self->n_filters = 0;
self->io_channel = NULL;
self->io_watch_id = 0;
}
static void
g_uevent_device_class_init(GUeventDeviceClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS(klass);
object_class->finalize = (GObjectFinalizeFunc) g_free;
}
GUeventDevice *
g_uevent_device_new(const gchar *syspath, const gchar *subsystem,
const gchar *devtype, gchar **filters)
{
GUeventDevice *self = g_object_new(G_TYPE_UEVENT_DEVICE, NULL);
self->syspath = g_strdup(syspath);
self->subsystem = g_strdup(subsystem);
self->devtype = g_strdup(devtype);
self->filters = g_strdupv(filters);
/* Compile the regex filters */
for (guint i = 0; self->filters[i]; i++) {
GRegex *regex_filter = g_regex_new(self->filters[i], 0, 0, NULL);
if (!regex_filter) {
g_warning("Failed to compile regex filter: %s", self->filters[i]);
continue;
}
self->regex_filters = g_realloc(self->regex_filters,
(self->n_filters + 1) * sizeof(GRegex *));
self->regex_filters[self->n_filters++] = regex_filter;
}
/* Open the uevent device file */
gchar *uevent_path = g_build_filename(self->syspath, "uevent", NULL);
GError *error = NULL;
self->io_channel = g_io_channel_new_file(uevent_path, "r", &error);
if (!self->io_channel) {
g_warning("Failed to open uevent device: %s", error->message);
g_error_free(error);
g_object_unref(self);
return NULL;
}
/* Add a watch for the IO channel */
self->io_watch_id = g_io_add_watch(self->io_channel, G_IO_IN,
g_uevent_device_io_watch_callback, self);
g_free(uevent_path);
return self;
}
```
这个示例代码演示了如何使用 GLib 和 GIO 库来创建一个 GUeventDevice 对象,该对象可以通过监听 Linux 内核的 uevent 消息来获取设备事件。GUeventDevice 对象可以指定一些过滤器,以只接收特定的 uevent 消息。在对象的销毁期间,将释放所有内存和资源。