X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=lttng-context.c;h=eca58ce1873b3ab18c25001ac362a086dda6ecbd;hb=refs%2Fheads%2Fstable-2.7;hp=b79b7f667bf483ce6611cfae31190fb1c19f12b4;hpb=a9dd15dadd7d58f58cfd19d2503d3b6b541723bc;p=lttng-modules.git

diff --git a/lttng-context.c b/lttng-context.c
index b79b7f66..eca58ce1 100644
--- a/lttng-context.c
+++ b/lttng-context.c
@@ -28,6 +28,16 @@
 #include "lttng-events.h"
 #include "lttng-tracer.h"
 
+/*
+ * The filter implementation requires that two consecutive "get" for the
+ * same context performed by the same thread return the same result.
+ */
+
+/*
+ * Static array of contexts, for $ctx filters.
+ */
+struct lttng_ctx *lttng_static_ctx;
+
 int lttng_find_context(struct lttng_ctx *ctx, const char *name)
 {
 	unsigned int i;
@@ -43,6 +53,23 @@ int lttng_find_context(struct lttng_ctx *ctx, const char *name)
 }
 EXPORT_SYMBOL_GPL(lttng_find_context);
 
+int lttng_get_context_index(struct lttng_ctx *ctx, const char *name)
+{
+	unsigned int i;
+
+	if (!ctx)
+		return -1;
+	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 i;
+	}
+	return -1;
+}
+EXPORT_SYMBOL_GPL(lttng_get_context_index);
+
 /*
  * Note: as we append context information, the pointer location may change.
  */
@@ -192,3 +219,61 @@ void lttng_destroy_context(struct lttng_ctx *ctx)
 	kfree(ctx->fields);
 	kfree(ctx);
 }
+
+int lttng_context_init(void)
+{
+	int ret;
+
+	ret = lttng_add_hostname_to_ctx(&lttng_static_ctx);
+	if (ret) {
+		printk(KERN_WARNING "Cannot add context lttng_add_hostname_to_ctx");
+	}
+	ret = lttng_add_nice_to_ctx(&lttng_static_ctx);
+	if (ret) {
+		printk(KERN_WARNING "Cannot add context lttng_add_nice_to_ctx");
+	}
+	ret = lttng_add_pid_to_ctx(&lttng_static_ctx);
+	if (ret) {
+		printk(KERN_WARNING "Cannot add context lttng_add_pid_to_ctx");
+	}
+	ret = lttng_add_ppid_to_ctx(&lttng_static_ctx);
+	if (ret) {
+		printk(KERN_WARNING "Cannot add context lttng_add_ppid_to_ctx");
+	}
+	ret = lttng_add_prio_to_ctx(&lttng_static_ctx);
+	if (ret) {
+		printk(KERN_WARNING "Cannot add context lttng_add_prio_to_ctx");
+	}
+	ret = lttng_add_procname_to_ctx(&lttng_static_ctx);
+	if (ret) {
+		printk(KERN_WARNING "Cannot add context lttng_add_procname_to_ctx");
+	}
+	ret = lttng_add_tid_to_ctx(&lttng_static_ctx);
+	if (ret) {
+		printk(KERN_WARNING "Cannot add context lttng_add_tid_to_ctx");
+	}
+	ret = lttng_add_vppid_to_ctx(&lttng_static_ctx);
+	if (ret) {
+		printk(KERN_WARNING "Cannot add context lttng_add_vppid_to_ctx");
+	}
+	ret = lttng_add_vtid_to_ctx(&lttng_static_ctx);
+	if (ret) {
+		printk(KERN_WARNING "Cannot add context lttng_add_vtid_to_ctx");
+	}
+	ret = lttng_add_vpid_to_ctx(&lttng_static_ctx);
+	if (ret) {
+		printk(KERN_WARNING "Cannot add context lttng_add_vpid_to_ctx");
+	}
+	ret = lttng_add_cpu_id_to_ctx(&lttng_static_ctx);
+	if (ret) {
+		printk(KERN_WARNING "Cannot add context lttng_add_cpu_id_to_ctx");
+	}
+	/* TODO: perf counters for filtering */
+	return 0;
+}
+
+void lttng_context_exit(void)
+{
+	lttng_destroy_context(lttng_static_ctx);
+	lttng_static_ctx = NULL;
+}