librestart.h revision 870ad75a2b67a92c3449d93b4fef8a0baa982b4a
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _LIBRESTART_H
#define _LIBRESTART_H
#include <libsysevent.h>
#include <libcontract.h>
#include <libscf.h>
#include <limits.h>
#include <priv.h>
#include <pwd.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* There are 3 parts to librestart.
* 1) The event protocol from the master restarter to its delegates.
* 2) A functional interface for updating the repository.
* 3) Convenience functions for common restarter tasks.
*
* Event protocol
* We need a reliable event protocol, as there's no way to define
* restarter events as idempotent.
*
* Currently using sysevent channels as the reliable event implementation.
* This could change if the implementation proves unsuitable, but
* the API defined here should abstract anything but a change in
* the fundamental event model.
*
* We offer functions to tease apart the event rather than generic
* nvpair interfaces. This is because each event type has a well-
* defined set of fields.
*/
/*
* Some of the functions have external contracted consumers, review contracts
* when making incompatible changes.
*/
typedef struct restarter_event_handle restarter_event_handle_t;
typedef struct restarter_event restarter_event_t;
typedef uint32_t restarter_event_type_t;
/*
* Define an event protocol version. In theory, we could use this in
* the future to support delegated restarters which use an older
* protocol. In practice, increment RESTARTER_EVENT_VERSION whenever the
* protocol might have changed.
*/
#define RESTARTER_EVENT_VERSION 4
#define RESTARTER_FLAG_DEBUG 1
#define RESTARTER_ERRMSGSZ 1024
/*
* Event types
* RESTARTER_EVENT_TYPE_ADD_INSTANCE
* responsible for a new (stopped) instance
* RESTARTER_EVENT_TYPE_REMOVE_INSTANCE
* no longer responsible for this instance; stop it and return
* RESTARTER_EVENT_TYPE_ENABLE
* no guarantee that dependencies are met; see
* RESTARTER_EVENT_TYPE_START
* RESTARTER_EVENT_TYPE_DISABLE
* no guarantee that instance was running
* RESTARTER_EVENT_TYPE_ADMIN_DEGRADED
* RESTARTER_EVENT_TYPE_ADMIN_REFRESH
* RESTARTER_EVENT_TYPE_ADMIN_RESTART
* RESTARTER_EVENT_TYPE_ADMIN_MAINT_OFF
* RESTARTER_EVENT_TYPE_ADMIN_MAINT_ON
* RESTARTER_EVENT_TYPE_ADMIN_MAINT_ON_IMMEDIATE
* RESTARTER_EVENT_TYPE_ADMIN_MAINT_OFF
* RESTARTER_EVENT_TYPE_STOP
* dependencies are, or are becoming, unsatisfied
* RESTARTER_EVENT_TYPE_START
* dependencies have become satisfied
* RESTARTER_EVENT_TYPE_DEPENDENCY_CYCLE
* instance caused a dependency cycle
* RESTARTER_EVENT_TYPE_INVALID_DEPENDENCY
* instance has an invalid dependency
*/
#define RESTARTER_EVENT_TYPE_INVALID 0
#define RESTARTER_EVENT_TYPE_ADD_INSTANCE 1
#define RESTARTER_EVENT_TYPE_REMOVE_INSTANCE 2
#define RESTARTER_EVENT_TYPE_ENABLE 3
#define RESTARTER_EVENT_TYPE_DISABLE 4
#define RESTARTER_EVENT_TYPE_ADMIN_DEGRADED 5
#define RESTARTER_EVENT_TYPE_ADMIN_REFRESH 6
#define RESTARTER_EVENT_TYPE_ADMIN_RESTART 7
#define RESTARTER_EVENT_TYPE_ADMIN_MAINT_OFF 8
#define RESTARTER_EVENT_TYPE_ADMIN_MAINT_ON 9
#define RESTARTER_EVENT_TYPE_STOP 11
#define RESTARTER_EVENT_TYPE_START 12
#define RESTARTER_EVENT_TYPE_DEPENDENCY_CYCLE 13
#define RESTARTER_EVENT_TYPE_INVALID_DEPENDENCY 14
#define RESTARTER_EVENT_TYPE_ADMIN_DISABLE 15
#define RESTARTER_EVENT_ERROR -1
#define RESTARTER_EVENT_INSTANCE_DISABLED 0
#define RESTARTER_EVENT_INSTANCE_ENABLED 1
typedef enum {
/*
* These values are ordered by severity of required restart, as we use
* integer comparisons to determine error flow.
*/
typedef enum {
RERR_UNSUPPORTED = -1,
RERR_NONE = 0, /* no error, restart, refresh */
RERR_FAULT, /* fault occurred */
RERR_RESTART, /* transition due to restart */
RERR_REFRESH /* transition due to refresh */
/*
* restarter_store_contract() and restarter_remove_contract() types
*/
typedef enum {
/*
* restarter_bind_handle() registers a delegate with svc.startd to
* begin consuming events.
*
* On initial bind, the delgated restarter receives an event for each
* instance it is responsible for, as if that instance was new.
*
* callers must have superuser privileges
*
* The event handler can return 0 for success, or EAGAIN to request
* retry of event delivery. EAGAIN may be returned 3 times before the
* event is discarded.
*/
int restarter_bind_handle(uint32_t, const char *,
int (*event_handler)(restarter_event_t *), int,
/*
* The following functions work only on certain types of events.
* They fail with a return of -1 if they're called on an inappropriate event.
*/
/*
* Functions for updating the repository.
*/
/*
* When setting state to "maintenance", callers of restarter_set_states() can
* set aux_state to "service_request" to communicate that another service has
* requested maintenance state for the target service.
*
* Callers should use restarter_inst_validate_aux_fmri() to validate the fmri
* of the requested service and pass "service_request" for aux_state when
* calling restarter_set_states(). See inetd and startd for examples.
*/
int restarter_set_states(restarter_event_handle_t *, const char *,
const char *);
int restarter_event_publish_retry(evchan_t *, const char *, const char *,
#define RESTARTER_METHOD_CONTEXT_VERSION 7
struct method_context {
/* Stable */
int ngroups; /* -1 means use initgroups(). */
char *corefile_pattern; /* Optional. */
char *project; /* NULL for no change */
char *resource_pool; /* NULL for project default */
char *working_dir; /* NULL for :default */
char **env; /* NULL for no env */
/* Private */
char *vbuf;
char *pwbuf;
};
/*
* An error structure that contains a message string, and a type
* that can be used to determine course of action by the reciever
* of the error structure.
*
* type - usually will be an errno equivalent but could contain
* defined error types for exampe SCF_ERROR_XXX
* msg - must be at the end of the structure as if the message is
* longer than EMSGSIZE we will reallocate the structure to
* handle the overflow
*/
typedef struct mc_error {
int destroy; /* Flag to indicate destruction steps */
int type; /* Type of error for decision making */
int size; /* The size of the error message string */
char msg[RESTARTER_ERRMSGSZ];
} mc_error_t;
int restarter_rm_libs_loadable(void);
/* instance, restarter name, method name, command line, structure pointer */
scf_snapshot_t *, const char *, const char *, struct method_context **);
void restarter_mc_error_destroy(mc_error_t *);
int restarter_set_method_context(struct method_context *, const char **);
void restarter_free_method_context(struct method_context *);
int restarter_is_null_method(const char *);
int restarter_is_kill_method(const char *);
int restarter_is_kill_proc_method(const char *);
/* Validate the inst fmri specified in restarter_actions/auxiliary_fmri */
/* Delete instance's restarter_actions/auxiliary_fmri property */
/* Get boolean value from instance's restarter_actions/auxiliary_tty */
/* Delete instance's restarter/auxiliary_fmri property */
/*
* Set instance's restarter/auxiliary_fmri, value come from
*/
#ifdef __cplusplus
}
#endif
#endif /* _LIBRESTART_H */