Services API. More...

#include <glib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#include <sys/types.h>
#include <crm_config.h>
#include "common/results.h"
#include <crm/services_compat.h>

Include dependency graph for services.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Data Structures
struct	svc_action_s
	Object for executing external actions. More...

Macros
#define	SYSTEMCTL "/bin/systemctl"

#define	PCMK_RESOURCE_CLASS_OCF "ocf"

#define	PCMK_RESOURCE_CLASS_SERVICE "service"

#define	PCMK_RESOURCE_CLASS_LSB "lsb"

#define	PCMK_RESOURCE_CLASS_SYSTEMD "systemd"

#define	PCMK_RESOURCE_CLASS_UPSTART "upstart"

#define	PCMK_RESOURCE_CLASS_NAGIOS "nagios"

#define	PCMK_RESOURCE_CLASS_STONITH "stonith"

#define	PCMK_RESOURCE_CLASS_ALERT "alert"

#define	PCMK_OCF_REASON_PREFIX "ocf-exit-reason:"

#define	PCMK_DEFAULT_AGENT_VERSION "0.1"

Typedefs
typedef struct svc_action_private_s	svc_action_private_t

typedef struct svc_action_s	svc_action_t
	Object for executing external actions. More...

Enumerations
enum	lsb_exitcode { PCMK_LSB_OK = 0, PCMK_LSB_UNKNOWN_ERROR = 1, PCMK_LSB_INVALID_PARAM = 2, PCMK_LSB_UNIMPLEMENT_FEATURE = 3, PCMK_LSB_INSUFFICIENT_PRIV = 4, PCMK_LSB_NOT_INSTALLED = 5, PCMK_LSB_NOT_CONFIGURED = 6, PCMK_LSB_NOT_RUNNING = 7 }

enum	lsb_status_exitcode { PCMK_LSB_STATUS_OK = 0, PCMK_LSB_STATUS_VAR_PID = 1, PCMK_LSB_STATUS_VAR_LOCK = 2, PCMK_LSB_STATUS_NOT_RUNNING = 3, PCMK_LSB_STATUS_UNKNOWN = 4, PCMK_LSB_STATUS_NOT_INSTALLED = 150, PCMK_LSB_STATUS_INSUFFICIENT_PRIV = 151 }

enum	nagios_exitcode { NAGIOS_STATE_OK = 0, NAGIOS_STATE_WARNING = 1, NAGIOS_STATE_CRITICAL = 2, NAGIOS_STATE_UNKNOWN = 3, NAGIOS_INSUFFICIENT_PRIV = 100, NAGIOS_STATE_DEPENDENT = 4, NAGIOS_NOT_INSTALLED = 101 }

enum	svc_action_flags { SVC_ACTION_LEAVE_GROUP = 0x01, SVC_ACTION_NON_BLOCKED = 0x02 }

Functions
GList *	get_directory_list (const char *root, gboolean files, gboolean executable)
	Get a list of files or directories in a given path. More...

GList *	resources_list_providers (const char *standard)
	Get a list of providers. More...

GList *	resources_list_agents (const char standard, const char provider)
	Get a list of resource agents. More...

GList *	resources_list_standards (void)

gboolean	resources_agent_exists (const char standard, const char provider, const char *agent)

svc_action_t *	resources_action_create (const char name, const char standard, const char provider, const char agent, const char action, guint interval_ms, int timeout, GHashTable params, enum svc_action_flags flags)
	Create a new resource action. More...

gboolean	services_action_kick (const char name, const char action, guint interval_ms)

const char *	resources_find_service_class (const char *agent)
	Find first service class that can provide a specified agent. More...

svc_action_t *	services_action_create_generic (const char exec, const char args[])

void	services_action_cleanup (svc_action_t *op)

void	services_action_free (svc_action_t *op)

int	services_action_user (svc_action_t op, const char user)
	Set the user and group that an action will execute as. More...

gboolean	services_action_sync (svc_action_t *op)

gboolean	services_action_async_fork_notify (svc_action_t op, void(action_callback)(svc_action_t ), void(action_fork_callback)(svc_action_t *))
	Run an action asynchronously, with callback after process is forked. More...

gboolean	services_action_async (svc_action_t op, void(action_callback)(svc_action_t *))
	Run an action asynchronously. More...

gboolean	services_action_cancel (const char name, const char action, guint interval_ms)
	Cancel a recurring action. More...

svc_action_t *	services_alert_create (const char id, const char exec, int timeout, GHashTable params, int sequence, void cb_data)
	Create an alert agent action. More...

gboolean	services_alert_async (svc_action_t action, void(cb)(svc_action_t *op))
	Execute an alert agent action. More...

enum ocf_exitcode	services_result2ocf (const char standard, const char action, int exit_status)

Detailed Description

Services API.

Definition in file services.h.

Macro Definition Documentation

◆ PCMK_DEFAULT_AGENT_VERSION

#define PCMK_DEFAULT_AGENT_VERSION "0.1"

Definition at line 55 of file services.h.

◆ PCMK_OCF_REASON_PREFIX

#define PCMK_OCF_REASON_PREFIX "ocf-exit-reason:"

Definition at line 52 of file services.h.

◆ PCMK_RESOURCE_CLASS_ALERT

#define PCMK_RESOURCE_CLASS_ALERT "alert"

Definition at line 46 of file services.h.

◆ PCMK_RESOURCE_CLASS_LSB

#define PCMK_RESOURCE_CLASS_LSB "lsb"

Definition at line 41 of file services.h.

◆ PCMK_RESOURCE_CLASS_NAGIOS

#define PCMK_RESOURCE_CLASS_NAGIOS "nagios"

Definition at line 44 of file services.h.

◆ PCMK_RESOURCE_CLASS_OCF

#define PCMK_RESOURCE_CLASS_OCF "ocf"

Definition at line 39 of file services.h.

◆ PCMK_RESOURCE_CLASS_SERVICE

#define PCMK_RESOURCE_CLASS_SERVICE "service"

Definition at line 40 of file services.h.

◆ PCMK_RESOURCE_CLASS_STONITH

#define PCMK_RESOURCE_CLASS_STONITH "stonith"

Definition at line 45 of file services.h.

◆ PCMK_RESOURCE_CLASS_SYSTEMD

#define PCMK_RESOURCE_CLASS_SYSTEMD "systemd"

Definition at line 42 of file services.h.

◆ PCMK_RESOURCE_CLASS_UPSTART

#define PCMK_RESOURCE_CLASS_UPSTART "upstart"

Definition at line 43 of file services.h.

◆ SYSTEMCTL

#define SYSTEMCTL "/bin/systemctl"

Definition at line 35 of file services.h.

Typedef Documentation

◆ svc_action_private_t

typedef struct svc_action_private_s svc_action_private_t

Definition at line 107 of file services.h.

◆ svc_action_t

typedef struct svc_action_s svc_action_t

Object for executing external actions.

Note: This object should never be instantiated directly, but instead created using one of the constructor functions (resources_action_create() for resource agents, services_alert_create() for alert agents, or services_action_create_generic() for generic executables). Similarly, do not use sizeof() on this struct.

Enumeration Type Documentation

◆ lsb_exitcode

enum lsb_exitcode

Enumerator
PCMK_LSB_OK
PCMK_LSB_UNKNOWN_ERROR
PCMK_LSB_INVALID_PARAM
PCMK_LSB_UNIMPLEMENT_FEATURE
PCMK_LSB_INSUFFICIENT_PRIV
PCMK_LSB_NOT_INSTALLED
PCMK_LSB_NOT_CONFIGURED
PCMK_LSB_NOT_RUNNING

Definition at line 57 of file services.h.

◆ lsb_status_exitcode

enum lsb_status_exitcode

Enumerator
PCMK_LSB_STATUS_OK
PCMK_LSB_STATUS_VAR_PID
PCMK_LSB_STATUS_VAR_LOCK
PCMK_LSB_STATUS_NOT_RUNNING
PCMK_LSB_STATUS_UNKNOWN
PCMK_LSB_STATUS_NOT_INSTALLED
PCMK_LSB_STATUS_INSUFFICIENT_PRIV

Definition at line 71 of file services.h.

◆ nagios_exitcode

enum nagios_exitcode

Enumerator
NAGIOS_STATE_OK
NAGIOS_STATE_WARNING
NAGIOS_STATE_CRITICAL
NAGIOS_STATE_UNKNOWN
NAGIOS_INSUFFICIENT_PRIV
NAGIOS_STATE_DEPENDENT
NAGIOS_NOT_INSTALLED	Deprecated: Unused

Definition at line 83 of file services.h.

◆ svc_action_flags

enum svc_action_flags

Enumerator
SVC_ACTION_LEAVE_GROUP
SVC_ACTION_NON_BLOCKED

Definition at line 101 of file services.h.

Function Documentation

◆ get_directory_list()

GList* get_directory_list	(	const char *	root,
		gboolean	files,
		gboolean	executable
	)

Get a list of files or directories in a given path.

Parameters

[in]	root	full path to a directory to read
[in]	files	return list of files if TRUE or directories if FALSE
[in]	executable	if TRUE and files is TRUE, only return executable files

Returns: a list of what was found. The list items are char *.

Note: It is the caller's responsibility to free the result with g_list_free_full(list, free).

Definition at line 1055 of file services.c.

◆ resources_action_create()

svc_action_t* resources_action_create	(	const char *	name,
		const char *	standard,
		const char *	provider,
		const char *	agent,
		const char *	action,
		guint	interval_ms,
		int	timeout,
		GHashTable *	params,
		enum svc_action_flags	flags
	)

Create a new resource action.

Parameters

[in]	name	Name of resource
[in]	standard	Resource agent standard (ocf, lsb, etc.)
[in]	provider	Resource agent provider
[in]	agent	Resource agent name
[in]	action	action (start, stop, monitor, etc.)
[in]	interval_ms	How often to repeat this action (if 0, execute once)
[in]	timeout	Consider action failed if it does not complete in this many milliseconds
[in]	params	Action parameters

Returns: newly allocated action instance

Postcondition: After the call, 'params' is owned, and later free'd by the svc_action_t result

Note: The caller is responsible for freeing the return value using services_action_free().

Definition at line 335 of file services.c.

◆ resources_agent_exists()

gboolean resources_agent_exists	(	const char *	standard,
		const char *	provider,
		const char *	agent
	)

Does the given standard, provider, and agent describe a resource that can exist?

Parameters

[in]	standard	Which class of agent does the resource belong to?
[in]	provider	What provides the agent (NULL for most standards)?
[in]	agent	What is the name of the agent?

Returns: A boolean

Definition at line 1175 of file services.c.

◆ resources_find_service_class()

const char* resources_find_service_class ( const char * agent )

Find first service class that can provide a specified agent.

Parameters

[in] agent Name of agent to search for

Returns: Service class if found, NULL otherwise

Note: The priority is LSB, then systemd, then upstart. It would be preferable to put systemd first, but LSB merely requires a file existence check, while systemd requires contacting D-Bus.

Definition at line 72 of file services.c.

◆ resources_list_agents()

GList* resources_list_agents	(	const char *	standard,
		const char *	provider
	)

Get a list of resource agents.

Parameters

[in]	standard	list agents using this standard (e.g. ocf, lsb, etc.) (or NULL for all)
[in]	provider	list agents from this provider (or NULL for all)

Returns: a list of resource agents. The list items are char *.

Note: The caller is responsible for freeing the result using g_list_free_full(list, free).

Definition at line 1119 of file services.c.

◆ resources_list_providers()

GList* resources_list_providers ( const char * standard )

Get a list of providers.

Parameters

[in] standard list providers of this standard (e.g. ocf, lsb, etc.)

Returns: a list of providers as char * list items (or NULL if standard does not support providers)

Note: The caller is responsible for freeing the result using g_list_free_full(list, free).

Definition at line 1109 of file services.c.

◆ resources_list_standards()

GList* resources_list_standards ( void )

Get list of available standards

Returns: a list of resource standards. The list items are char *. This list must be destroyed using g_list_free_full(list, free).

Definition at line 1061 of file services.c.

◆ services_action_async()

gboolean services_action_async	(	svc_action_t *	op,
		void()(svc_action_t )	action_callback
	)

Run an action asynchronously.

Parameters

[in]	op	Action to run
[in]	action_callback	Function to call when the action completes (if NULL, any previously set callback will continue to be used)

Returns: Boolean value

Return values

TRUE	if the caller should not free or otherwise use `op` again, because one of these conditions is true:

op is NULL.
The action was successfully initiated, in which case action_callback has not been called (it will be called when the action completes).
The action's ID matched an existing recurring action. The existing action has taken over the callback and callback data from op and has been re-initiated asynchronously, and op has been freed.
Another action for the same resource is in flight, and op will be blocked until it completes.
The action could not be initiated, and is either non-recurring or being cancelled. action_callback has been called, and op has been freed.

Return values

FALSE if is still valid, because the action cannot be initiated, and is a recurring action that is not being cancelled. action_callback has been called, and a timer has been set for the next invocation of op.

Definition at line 901 of file services.c.

◆ services_action_async_fork_notify()

gboolean services_action_async_fork_notify	(	svc_action_t *	op,
		void()(svc_action_t )	action_callback,
		void()(svc_action_t )	action_fork_callback
	)

Run an action asynchronously, with callback after process is forked.

Parameters

[in]	op	Action to run
[in]	action_callback	Function to call when the action completes (if NULL, any previously set callback will continue to be used)
[in]	action_fork_callback	Function to call after action process forks (if NULL, any previously set callback will continue to be used)

Returns: Boolean value

Return values

TRUE	if the caller should not free or otherwise use `op` again, because one of these conditions is true:

op is NULL.
The action was successfully initiated, in which case action_fork_callback has been called, but action_callback has not (it will be called when the action completes).
The action's ID matched an existing recurring action. The existing action has taken over the callback and callback data from op and has been re-initiated asynchronously, and op has been freed.
Another action for the same resource is in flight, and op will be blocked until it completes.
The action could not be initiated, and is either non-recurring or being cancelled. action_fork_callback has not been called, but action_callback has, and op has been freed.

Return values

FALSE if is still valid, because the action cannot be initiated, and is a recurring action that is not being cancelled. action_fork_callback has not been called, but action_callback has, and a timer has been set for the next invocation of op.

Definition at line 867 of file services.c.

◆ services_action_cancel()

gboolean services_action_cancel	(	const char *	name,
		const char *	action,
		guint	interval_ms
	)

Cancel a recurring action.

Parameters

[in]	name	Name of resource that operation is for
[in]	action	Name of operation to cancel
[in]	interval_ms	Interval of operation to cancel

Returns: TRUE if action was successfully cancelled, FALSE otherwise

Definition at line 664 of file services.c.

◆ services_action_cleanup()

void services_action_cleanup ( svc_action_t * op )

Definition at line 501 of file services.c.

◆ services_action_create_generic()

svc_action_t* services_action_create_generic	(	const char *	exec,
		const char *	args[]
	)

Utilize services API to execute an arbitrary command.

This API has useful infrastructure in place to be able to run a command in the background and get notified via a callback when the command finishes.

Parameters

[in]	exec	command to execute
[in]	args	arguments to the command, NULL terminated

Returns: a svc_action_t object, used to pass to the execute function (services_action_sync() or services_action_async()) and is provided to the callback.

Definition at line 356 of file services.c.

◆ services_action_free()

void services_action_free ( svc_action_t * op )

Definition at line 585 of file services.c.

◆ services_action_kick()

gboolean services_action_kick	(	const char *	name,
		const char *	action,
		guint	interval_ms
	)

Kick a recurring action so it is scheduled immediately for re-execution

Definition at line 732 of file services.c.

◆ services_action_sync()

gboolean services_action_sync ( svc_action_t * op )

Definition at line 1020 of file services.c.

◆ services_action_user()

int services_action_user	(	svc_action_t *	op,
		const char *	user
	)

Set the user and group that an action will execute as.

Parameters

[in,out]	action	Action to modify
[in]	user	Name of user to execute action as
[in]	group	Name of group to execute action as

Returns: pcmk_ok on success, -errno otherwise

Note: This will have no effect unless the process executing the action runs as root, and the action is not a systemd or upstart action. We could implement this for systemd by adding User= and Group= to [Service] in the override file, but that seems more likely to cause problems than be useful.

Definition at line 445 of file services.c.

◆ services_alert_async()

gboolean services_alert_async	(	svc_action_t *	action,
		void()(svc_action_t op)	cb
	)

Execute an alert agent action.

Parameters

[in]	action	Action to execute
[in]	cb	Function to call when action completes

Returns: TRUE if the library will free action, FALSE otherwise

Note: If this function returns FALSE, it is the caller's responsibility to free the action with services_action_free(). However, unless someone intentionally creates a recurring alert action, this will never return FALSE.

Definition at line 465 of file services.c.

◆ services_alert_create()

svc_action_t* services_alert_create	(	const char *	id,
		const char *	exec,
		int	timeout,
		GHashTable *	params,
		int	sequence,
		void *	cb_data
	)

Create an alert agent action.

Parameters

[in]	id	Alert ID
[in]	exec	Path to alert agent executable
[in]	timeout	Action timeout
[in]	params	Parameters to use with action
[in]	sequence	Action sequence number
[in]	cb_data	Data to pass to callback function

Returns: New action on success, NULL on error

Note: It is the caller's responsibility to free cb_data. The caller should not free params explicitly.

Definition at line 413 of file services.c.

◆ services_result2ocf()

enum ocf_exitcode services_result2ocf	(	const char *	standard,
		const char *	action,
		int	exit_status
	)

Definition at line 550 of file services.c.

Data Structures

Macros

Typedefs

Enumerations

Functions

Detailed Description

Macro Definition Documentation

◆ PCMK_DEFAULT_AGENT_VERSION

◆ PCMK_OCF_REASON_PREFIX

◆ PCMK_RESOURCE_CLASS_ALERT

◆ PCMK_RESOURCE_CLASS_LSB

◆ PCMK_RESOURCE_CLASS_NAGIOS

◆ PCMK_RESOURCE_CLASS_OCF

◆ PCMK_RESOURCE_CLASS_SERVICE

◆ PCMK_RESOURCE_CLASS_STONITH

◆ PCMK_RESOURCE_CLASS_SYSTEMD

◆ PCMK_RESOURCE_CLASS_UPSTART

◆ SYSTEMCTL

Typedef Documentation

◆ svc_action_private_t

◆ svc_action_t

Enumeration Type Documentation

◆ lsb_exitcode

◆ lsb_status_exitcode

◆ nagios_exitcode

◆ svc_action_flags

Function Documentation

◆ get_directory_list()

◆ resources_action_create()

◆ resources_agent_exists()

◆ resources_find_service_class()

◆ resources_list_agents()

◆ resources_list_providers()

◆ resources_list_standards()

◆ services_action_async()

◆ services_action_async_fork_notify()

◆ services_action_cancel()

◆ services_action_cleanup()

◆ services_action_create_generic()

◆ services_action_free()

◆ services_action_kick()

◆ services_action_sync()

◆ services_action_user()

◆ services_alert_async()

◆ services_alert_create()

◆ services_result2ocf()