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