[PATCH v8] tools/lib/traceevent: Man pages for tep plugins APIs

[PATCH v8] tools/lib/traceevent: Man pages for tep plugins APIs

[Tzvetomir Stoyanov (VMware)]

From: Tzvetomir Stoyanov <tstoyanov@vmware.com>

Create man pages for libtraceevent APIs:
  tep_load_plugins(),
  tep_unload_plugin()

Suggested-by: Patrick McLean <chutzpah@gentoo.org>
Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
---
[
 v8 changes:
   - the user's plugin directory changed from 
 ~/.config/traceevent/plugins/ to ~/.local/lib/traceevent/plugins/, 
 as suggested by Patrick McLean.
 https://lore.kernel.org/linux-trace-devel/20190313144206.41e75cf8@patrickm/
]

 .../Documentation/libtraceevent-plugins.txt   | 98 +++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 tools/lib/traceevent/Documentation/libtraceevent-plugins.txt

diff --git a/tools/lib/traceevent/Documentation/libtraceevent-plugins.txt b/tools/lib/traceevent/Documentation/libtraceevent-plugins.txt
new file mode 100644
index 000000000000..ce0288719939
--- /dev/null
+++ b/tools/lib/traceevent/Documentation/libtraceevent-plugins.txt
@@ -0,0 +1,98 @@
+libtraceevent(3)
+================
+
+NAME
+----
+tep_load_plugins, tep_unload_plugins - Load / unload traceevent plugins.
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <event-parse.h>*
+
+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_);
+--
+
+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]
+--
+	- 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_
+--
+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 must be called before _tep_load_plugins()_.
+
+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.
+
+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 <event-parse.h>
+...
+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);
+--
+
+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* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+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
-- 
2.21.0

Re: [PATCH v8] tools/lib/traceevent: Man pages for tep plugins APIs

[Steven Rostedt]

On Tue, 30 Jul 2019 15:50:40 +0300
"Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com> wrote:

> From: Tzvetomir Stoyanov <tstoyanov@vmware.com>
> 
> Create man pages for libtraceevent APIs:
>   tep_load_plugins(),
>   tep_unload_plugin()
> 
> Suggested-by: Patrick McLean <chutzpah@gentoo.org>
> Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
> ---
> [
>  v8 changes:
>    - the user's plugin directory changed from 
>  ~/.config/traceevent/plugins/ to ~/.local/lib/traceevent/plugins/, 
>  as suggested by Patrick McLean.
>  https://lore.kernel.org/linux-trace-devel/20190313144206.41e75cf8@patrickm/
> ]
> 
>  .../Documentation/libtraceevent-plugins.txt   | 98 +++++++++++++++++++
>  1 file changed, 98 insertions(+)
>  create mode 100644 tools/lib/traceevent/Documentation/libtraceevent-plugins.txt
> 
> diff --git a/tools/lib/traceevent/Documentation/libtraceevent-plugins.txt b/tools/lib/traceevent/Documentation/libtraceevent-plugins.txt
> new file mode 100644
> index 000000000000..ce0288719939
> --- /dev/null
> +++ b/tools/lib/traceevent/Documentation/libtraceevent-plugins.txt
> @@ -0,0 +1,98 @@
> +libtraceevent(3)
> +================
> +
> +NAME
> +----
> +tep_load_plugins, tep_unload_plugins - Load / unload traceevent plugins.
> +
> +SYNOPSIS
> +--------
> +[verse]
> +--
> +*#include <event-parse.h>*
> +
> +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_);
> +--
> +
> +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]
> +--
> +	- 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_
> +--
> +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 must be called before _tep_load_plugins()_.

I wouldn't say tep_set_flag() must be called, but instead say that it
needs to be called first if the default (of loading all possible
plugins) is not the desired case.

-- Steve


> +
> +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.
> +
> +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 <event-parse.h>
> +...
> +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);
> +--
> +
> +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* <rostedt@goodmis.org>, author of *libtraceevent*.
> +*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
> +--
> +REPORTING BUGS
> +--------------
> +Report bugs to  <linux-trace-devel@vger.kernel.org>
> +
> +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