* Copyright 2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* LTTng trace/channel/event context management.
+ *
+ * Dual LGPL v2.1/GPL v2 license.
*/
#include <linux/module.h>
#include "ltt-events.h"
#include "ltt-tracer.h"
+int lttng_find_context(struct lttng_ctx *ctx, const char *name)
+{
+ unsigned int i;
+
+ for (i = 0; i < ctx->nr_fields; i++) {
+ /* Skip allocated (but non-initialized) contexts */
+ if (!ctx->fields[i].event_field.name)
+ continue;
+ if (!strcmp(ctx->fields[i].event_field.name, name))
+ return 1;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(lttng_find_context);
+
struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p)
{
struct lttng_ctx_field *field;
if (ctx->nr_fields + 1 > ctx->allocated_fields) {
struct lttng_ctx_field *new_fields;
- ctx->allocated_fields = min_t(size_t, 1, 2 * ctx->allocated_fields);
+ ctx->allocated_fields = max_t(size_t, 1, 2 * ctx->allocated_fields);
new_fields = kzalloc(ctx->allocated_fields * sizeof(struct lttng_ctx_field), GFP_KERNEL);
if (!new_fields)
return NULL;
if (ctx->fields)
- memcpy(new_fields, ctx->fields, ctx->nr_fields);
+ memcpy(new_fields, ctx->fields, sizeof(*ctx->fields) * ctx->nr_fields);
kfree(ctx->fields);
ctx->fields = new_fields;
}
}
EXPORT_SYMBOL_GPL(lttng_append_context);
+/*
+ * Remove last context field.
+ */
+void lttng_remove_context_field(struct lttng_ctx **ctx_p,
+ struct lttng_ctx_field *field)
+{
+ struct lttng_ctx *ctx;
+
+ ctx = *ctx_p;
+ ctx->nr_fields--;
+ WARN_ON_ONCE(&ctx->fields[ctx->nr_fields] != field);
+ memset(&ctx->fields[ctx->nr_fields], 0, sizeof(struct lttng_ctx_field));
+}
+EXPORT_SYMBOL_GPL(lttng_remove_context_field);
+
void lttng_destroy_context(struct lttng_ctx *ctx)
{
int i;
+ if (!ctx)
+ return;
for (i = 0; i < ctx->nr_fields; i++) {
if (ctx->fields[i].destroy)
ctx->fields[i].destroy(&ctx->fields[i]);