initial code repo

[stor4nfv.git] / src / ceph / src / common / TracepointProvider.cc

diff --git a/src/ceph/src/common/TracepointProvider.cc b/src/ceph/src/common/TracepointProvider.cc
new file mode 100644 (file)
index 0000000..f96c50d
--- /dev/null
+++ b/src/ceph/src/common/TracepointProvider.cc
@@ -0,0 +1,45 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "common/TracepointProvider.h"
+#include "common/config.h"
+
+TracepointProvider::TracepointProvider(CephContext *cct, const char *library,
+                                       const char *config_key)
+  : m_cct(cct), m_library(library), m_config_keys{config_key, NULL},
+    m_lock("TracepointProvider::m_lock") {
+  m_cct->_conf->add_observer(this);
+  verify_config(m_cct->_conf);
+}
+
+TracepointProvider::~TracepointProvider() {
+  m_cct->_conf->remove_observer(this);
+  if (m_handle) {
+    dlclose(m_handle);
+  }
+}
+
+void TracepointProvider::handle_conf_change(
+    const struct md_config_t *conf, const std::set<std::string> &changed) {
+  if (changed.count(m_config_keys[0])) {
+    verify_config(conf);
+  }
+}
+
+void TracepointProvider::verify_config(const struct md_config_t *conf) {
+  Mutex::Locker locker(m_lock);
+  if (m_handle) {
+    return;
+  }
+
+  char buf[10];
+  char *pbuf = buf;
+  if (conf->get_val(m_config_keys[0], &pbuf, sizeof(buf)) != 0 ||
+      strncmp(buf, "true", 5) != 0) {
+    return;
+  }
+
+  m_handle = dlopen(m_library.c_str(), RTLD_NOW | RTLD_NODELETE);
+  assert(m_handle);
+}
+