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// -*- 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_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 ConfigProxy& conf, const std::set<std::string> &changed) {
if (changed.count(m_config_keys[0])) {
verify_config(conf);
}
}
void TracepointProvider::verify_config(const ConfigProxy& conf) {
std::lock_guard 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);
ceph_assert(m_handle);
}
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