return ret;
}
+static
+long lttng_event_notifier_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct lttng_event_notifier_enabler *event_notifier_enabler;
+ enum lttng_event_type *evtype = file->private_data;
+
+ switch (cmd) {
+ case LTTNG_KERNEL_ENABLE:
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ return -EINVAL;
+ case LTTNG_TYPE_ENABLER:
+ event_notifier_enabler = file->private_data;
+ return lttng_event_notifier_enabler_enable(event_notifier_enabler);
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_DISABLE:
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ return -EINVAL;
+ case LTTNG_TYPE_ENABLER:
+ event_notifier_enabler = file->private_data;
+ return lttng_event_notifier_enabler_disable(event_notifier_enabler);
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
+ case LTTNG_KERNEL_FILTER:
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ return -EINVAL;
+ case LTTNG_TYPE_ENABLER:
+ event_notifier_enabler = file->private_data;
+ return lttng_event_notifier_enabler_attach_bytecode(event_notifier_enabler,
+ (struct lttng_kernel_filter_bytecode __user *) arg);
+ default:
+ WARN_ON_ONCE(1);
+ return -ENOSYS;
+ }
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+static
+int lttng_event_notifier_release(struct inode *inode, struct file *file)
+{
+ struct lttng_event_notifier *event_notifier;
+ struct lttng_event_notifier_enabler *event_notifier_enabler;
+ enum lttng_event_type *evtype = file->private_data;
+
+ if (!evtype)
+ return 0;
+
+ switch (*evtype) {
+ case LTTNG_TYPE_EVENT:
+ event_notifier = file->private_data;
+ if (event_notifier)
+ fput(event_notifier->group->file);
+ break;
+ case LTTNG_TYPE_ENABLER:
+ event_notifier_enabler = file->private_data;
+ if (event_notifier_enabler)
+ fput(event_notifier_enabler->group->file);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+
+ return 0;
+}
+
+static const struct file_operations lttng_event_notifier_fops = {
+ .owner = THIS_MODULE,
+ .release = lttng_event_notifier_release,
+ .unlocked_ioctl = lttng_event_notifier_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = lttng_event_notifier_ioctl,
+#endif
+};
+
+static
+int lttng_abi_create_event_notifier(struct file *event_notifier_group_file,
+ struct lttng_kernel_event_notifier *event_notifier_param)
+{
+ struct lttng_event_notifier_group *event_notifier_group =
+ event_notifier_group_file->private_data;
+ int event_notifier_fd, ret;
+ struct file *event_notifier_file;
+ void *priv;
+
+ switch (event_notifier_param->event.instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ case LTTNG_KERNEL_KPROBE:
+ case LTTNG_KERNEL_UPROBE:
+ case LTTNG_KERNEL_KRETPROBE:
+ case LTTNG_KERNEL_FUNCTION:
+ case LTTNG_KERNEL_NOOP:
+ case LTTNG_KERNEL_SYSCALL:
+ default:
+ ret = -EINVAL;
+ goto inval_instr;
+ }
+
+ event_notifier_param->event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+
+ event_notifier_fd = lttng_get_unused_fd();
+ if (event_notifier_fd < 0) {
+ ret = event_notifier_fd;
+ goto fd_error;
+ }
+
+ event_notifier_file = anon_inode_getfile("[lttng_event_notifier]",
+ <tng_event_notifier_fops,
+ NULL, O_RDWR);
+ if (IS_ERR(event_notifier_file)) {
+ ret = PTR_ERR(event_notifier_file);
+ goto file_error;
+ }
+
+ /* The event notifier holds a reference on the event notifier group. */
+ if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) {
+ ret = -EOVERFLOW;
+ goto refcount_error;
+ }
+
+ if (event_notifier_param->event.instrumentation == LTTNG_KERNEL_TRACEPOINT
+ || event_notifier_param->event.instrumentation == LTTNG_KERNEL_SYSCALL) {
+ struct lttng_event_notifier_enabler *enabler;
+
+ if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) {
+ /*
+ * If the event name is a star globbing pattern,
+ * we create the special star globbing enabler.
+ */
+ enabler = lttng_event_notifier_enabler_create(
+ event_notifier_group,
+ LTTNG_ENABLER_FORMAT_STAR_GLOB,
+ event_notifier_param);
+ } else {
+ enabler = lttng_event_notifier_enabler_create(
+ event_notifier_group,
+ LTTNG_ENABLER_FORMAT_NAME,
+ event_notifier_param);
+ }
+ priv = enabler;
+ } else {
+ struct lttng_event_notifier *event_notifier;
+
+ /*
+ * We tolerate no failure path after event notifier creation.
+ * It will stay invariant for the rest of the session.
+ */
+ event_notifier = lttng_event_notifier_create(NULL,
+ event_notifier_param->event.token, event_notifier_group,
+ event_notifier_param, NULL,
+ event_notifier_param->event.instrumentation);
+ WARN_ON_ONCE(!event_notifier);
+ if (IS_ERR(event_notifier)) {
+ ret = PTR_ERR(event_notifier);
+ goto event_notifier_error;
+ }
+ priv = event_notifier;
+ }
+ event_notifier_file->private_data = priv;
+ fd_install(event_notifier_fd, event_notifier_file);
+ return event_notifier_fd;
+
+event_notifier_error:
+ atomic_long_dec(&event_notifier_group_file->f_count);
+refcount_error:
+ fput(event_notifier_file);
+file_error:
+ put_unused_fd(event_notifier_fd);
+fd_error:
+inval_instr:
+ return ret;
+}
+
static
long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
switch (cmd) {
+ case LTTNG_KERNEL_EVENT_NOTIFIER_CREATE:
+ {
+ struct lttng_kernel_event_notifier uevent_notifier_param;
+
+ if (copy_from_user(&uevent_notifier_param,
+ (struct lttng_kernel_event_notifier __user *) arg,
+ sizeof(uevent_notifier_param)))
+ return -EFAULT;
+ return lttng_abi_create_event_notifier(file, &uevent_notifier_param);
+ }
default:
return -ENOIOCTLCMD;
}
projects / lttng-modules.git / blobdiff