libtraceevent(3) ================ NAME ---- tep_load_plugins, tep_unload_plugins, tep_load_plugins_hook - Load / unload traceevent plugins. SYNOPSIS -------- [verse] -- *#include * struct tep_plugin_list pass:[*]*tep_load_plugins*(struct tep_handle pass:[*]_tep_); void *tep_unload_plugins*(struct tep_plugin_list pass:[*]_plugin_list_, struct tep_handle pass:[*]_tep_); void *tep_load_plugins_hook*(struct tep_handle pass:[*]_tep_, const char pass:[*]_suffix_, void (pass:[*]_load_plugin_)(struct tep_handle pass:[*]tep, const char pass:[*]path, const char pass:[*]name, void pass:[*]data), void pass:[*]_data_); -- DESCRIPTION ----------- The _tep_load_plugins()_ function loads all plugins, located in the plugin directories. The _tep_ argument is trace event parser context. The plugin directories are : [verse] -- - Directories, specified in _tep_->plugins_dir with priority TEP_PLUGIN_FIRST - System's plugin directory, defined at the library compile time. It depends on the library installation prefix and usually is _(install_preffix)/lib/traceevent/plugins_ - Directory, defined by the environment variable _TRACEEVENT_PLUGIN_DIR_ - User's plugin directory, located at _~/.local/lib/traceevent/plugins_ - Directories, specified in _tep_->plugins_dir with priority TEP_PLUGIN_LAST -- Loading of plugins can be controlled by the _tep_flags_, using the _tep_set_flag()_ API: [verse] -- _TEP_DISABLE_SYS_PLUGINS_ - do not load plugins, located in the system's plugin directory. _TEP_DISABLE_PLUGINS_ - do not load any plugins. -- The _tep_set_flag()_ API needs to be called before _tep_load_plugins()_, if loading of all plugins is not the desired case. The _tep_unload_plugins()_ function unloads the plugins, previously loaded by _tep_load_plugins()_. The _tep_ argument is trace event parser context. The _plugin_list_ is the list of loaded plugins, returned by the _tep_load_plugins()_ function. The _tep_load_plugins_hook_ function walks through all directories with plugins and calls user specified _load_plugin()_ hook for each plugin file. Only files with given _suffix_ are considered to be plugins. The _data_ is a user specified context, passed to _load_plugin()_. Directories and the walk order are the same as in _tep_load_plugins()_ API. RETURN VALUE ------------ The _tep_load_plugins()_ function returns a list of successfully loaded plugins, or NULL in case no plugins are loaded. EXAMPLE ------- [source,c] -- #include ... struct tep_handle *tep = tep_alloc(); ... struct tep_plugin_list *plugins = tep_load_plugins(tep); if (plugins == NULL) { /* no plugins are loaded */ } ... tep_unload_plugins(plugins, tep); ... void print_plugin(struct tep_handle *tep, const char *path, const char *name, void *data) { pritnf("Found libtraceevent plugin %s/%s\n", path, name); } ... tep_load_plugins_hook(tep, ".so", print_plugin, NULL); ... -- FILES ----- [verse] -- *event-parse.h* Header file to include in order to have access to the library APIs. *-ltraceevent* Linker switch to add when building a program that uses the library. -- SEE ALSO -------- _libtraceevent(3)_, _trace-cmd(1)_, _tep_set_flag(3)_ AUTHOR ------ [verse] -- *Steven Rostedt* , author of *libtraceevent*. *Tzvetomir Stoyanov* , author of this man page. -- REPORTING BUGS -------------- Report bugs to LICENSE ------- libtraceevent is Free Software licensed under the GNU LGPL 2.1 RESOURCES --------- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git