* Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* Holds LTTng probes registry.
+ *
+ * Dual LGPL v2.1/GPL v2 license.
*/
#include <linux/module.h>
#include <linux/list.h>
#include <linux/mutex.h>
+#include <linux/seq_file.h>
#include "ltt-events.h"
module_put(event->owner);
}
EXPORT_SYMBOL_GPL(ltt_event_put);
+
+static
+void *tp_list_start(struct seq_file *m, loff_t *pos)
+{
+ struct lttng_probe_desc *probe_desc;
+ int iter = 0, i;
+
+ mutex_lock(&probe_mutex);
+ list_for_each_entry(probe_desc, &probe_list, head) {
+ for (i = 0; i < probe_desc->nr_events; i++) {
+ if (iter++ >= *pos)
+ return (void *) &probe_desc->event_desc[i];
+ }
+ }
+ /* End of list */
+ return NULL;
+}
+
+static
+void *tp_list_next(struct seq_file *m, void *p, loff_t *ppos)
+{
+ struct lttng_probe_desc *probe_desc;
+ int iter = 0, i;
+
+ (*ppos)++;
+ list_for_each_entry(probe_desc, &probe_list, head) {
+ for (i = 0; i < probe_desc->nr_events; i++) {
+ if (iter++ >= *ppos)
+ return (void *) &probe_desc->event_desc[i];
+ }
+ }
+ /* End of list */
+ return NULL;
+}
+
+static
+void tp_list_stop(struct seq_file *m, void *p)
+{
+ mutex_unlock(&probe_mutex);
+}
+
+static
+int tp_list_show(struct seq_file *m, void *p)
+{
+ const struct lttng_event_desc *probe_desc = p;
+
+ /*
+ * Don't export lttng internal events (metadata).
+ */
+ if (!strncmp(probe_desc->name, "lttng_", sizeof("lttng_") - 1))
+ return 0;
+ seq_printf(m, "event { name = %s; };\n",
+ probe_desc->name);
+ return 0;
+}
+
+static
+const struct seq_operations lttng_tracepoint_list_seq_ops = {
+ .start = tp_list_start,
+ .next = tp_list_next,
+ .stop = tp_list_stop,
+ .show = tp_list_show,
+};
+
+static
+int lttng_tracepoint_list_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, <tng_tracepoint_list_seq_ops);
+}
+
+const struct file_operations lttng_tracepoint_list_fops = {
+ .open = lttng_tracepoint_list_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};