Implement event notifier group create

[deliverable/lttng-modules.git] / src / lttng-abi.c

diff --git a/src/lttng-abi.c b/src/lttng-abi.c
index 3bc2d1fb7c3df1a979ef1992f14554079dbddff3..00d0a34eb7251fc6be3fd25d7d71f8b6604adf21 100644 (file)
--- a/src/lttng-abi.c
+++ b/src/lttng-abi.c
@@ -59,6 +59,7 @@ static const struct file_operations lttng_proc_ops;
 #endif
 
 static const struct file_operations lttng_session_fops;
+static const struct file_operations lttng_event_notifier_group_fops;
 static const struct file_operations lttng_channel_fops;
 static const struct file_operations lttng_metadata_fops;
 static const struct file_operations lttng_event_fops;
@@ -105,6 +106,41 @@ fd_error:
        return ret;
 }
 
+static
+int lttng_abi_create_event_notifier_group(void)
+{
+       struct lttng_event_notifier_group *event_notifier_group;
+       struct file *event_notifier_group_file;
+       int event_notifier_group_fd, ret;
+
+       event_notifier_group = lttng_event_notifier_group_create();
+       if (!event_notifier_group)
+               return -ENOMEM;
+
+       event_notifier_group_fd = lttng_get_unused_fd();
+       if (event_notifier_group_fd < 0) {
+               ret = event_notifier_group_fd;
+               goto fd_error;
+       }
+       event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]",
+                                         &lttng_event_notifier_group_fops,
+                                         event_notifier_group, O_RDWR);
+       if (IS_ERR(event_notifier_group_file)) {
+               ret = PTR_ERR(event_notifier_group_file);
+               goto file_error;
+       }
+
+       event_notifier_group->file = event_notifier_group_file;
+       fd_install(event_notifier_group_fd, event_notifier_group_file);
+       return event_notifier_group_fd;
+
+file_error:
+       put_unused_fd(event_notifier_group_fd);
+fd_error:
+       lttng_event_notifier_group_destroy(event_notifier_group);
+       return ret;
+}
+
 static
 int lttng_abi_tracepoint_list(void)
 {
@@ -306,6 +342,8 @@ long lttng_abi_add_context(struct file *file,
  *             Returns after all previously running probes have completed
  *     LTTNG_KERNEL_TRACER_ABI_VERSION
  *             Returns the LTTng kernel tracer ABI version
+ *     LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE
+ *             Returns a LTTng event notifier group file descriptor
  *
  * The returned session will be deleted when its file descriptor is closed.
  */
@@ -316,6 +354,8 @@ long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
        case LTTNG_KERNEL_OLD_SESSION:
        case LTTNG_KERNEL_SESSION:
                return lttng_abi_create_session();
+       case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE:
+               return lttng_abi_create_event_notifier_group();
        case LTTNG_KERNEL_OLD_TRACER_VERSION:
        {
                struct lttng_kernel_tracer_version v;
@@ -1398,6 +1438,37 @@ fd_error:
        return ret;
 }
 
+static
+long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd,
+               unsigned long arg)
+{
+       switch (cmd) {
+       default:
+               return -ENOIOCTLCMD;
+       }
+       return 0;
+}
+
+static
+int lttng_event_notifier_group_release(struct inode *inode, struct file *file)
+{
+       struct lttng_event_notifier_group *event_notifier_group =
+                       file->private_data;
+
+       if (event_notifier_group)
+               lttng_event_notifier_group_destroy(event_notifier_group);
+       return 0;
+}
+
+static const struct file_operations lttng_event_notifier_group_fops = {
+       .owner = THIS_MODULE,
+       .release = lttng_event_notifier_group_release,
+       .unlocked_ioctl = lttng_event_notifier_group_ioctl,
+#ifdef CONFIG_COMPAT
+       .compat_ioctl = lttng_event_notifier_group_ioctl,
+#endif
+};
+
 /**
  *     lttng_channel_ioctl - lttng syscall through ioctl
  *