SMF_ENABLE_INSTANCE(3SCF) Service Configuration Facility Library Functions SMF_ENABLE_INSTANCE(3SCF)

smf_enable_instance, smf_disable_instance, smf_disable_instance_with_comment, smf_refresh_instance, smf_restart_instance, smf_maintain_instance, smf_degrade_instance, smf_restore_instance, smf_get_state - administrative interface to the Service Configuration Facility

cc [ flag... ] file... -lscf [ library... ]
#include <libscf.h>
int smf_enable_instance(const char *instance, int flags);

int smf_disable_instance(const char *instance, int flags);

int smf_disable_instance_with_comment(const char *instance,
    int flags, const char *comment);

int smf_refresh_instance(const char *instance);

int smf_restart_instance(const char *instance);

int smf_maintain_instance(const char *instance, int flags);

int smf_degrade_instance(const char *instance, int flags);

int smf_restore_instance(const char *instance);

char *smf_get_state(const char *instance);

These functions provide administrative control over service instances. Using these functions, an administrative tool can make a request to enable, disable, refresh, or restart an instance. All calls are asynchronous. They request an action, but do not wait to see if the action succeeds or fails.

The smf_enable_instance() function enables the service instance specified by instance FMRI. If flags is SMF_TEMPORARY, the enabling of the service instance is a temporary change, lasting only for the lifetime of the current system instance. The flags argument is set to 0 if no flags are to be use.

The smf_disable_instance() function places the service instance specified by instance FMRI in the disabled state and triggers the stop method (see svc.startd(8)). If flags is SMF_TEMPORARY, the disabling of the service instance is a temporary change, lasting only for the lifetime of the current system instance. The flags argument is set to 0 if no flags are to be use.

The smf_disable_instance_with_comment() function behaves the same as smf_disable_instance(), except the given free-form comment is recorded under the comment property, as reported by svcs(1). The comment may be up to SCF_COMMENT_MAX_LENGTH characters including the NUL terminator.

The smf_refresh_instance() function causes the service instance specified by instance FMRI to re-read its configuration information.

The smf_restart_instance() function restarts the service instance specified by instance FMRI.

The smf_maintain_instance() function moves the service instance specified by instance into the maintenance state. If flags is SMF_IMMEDIATE, the instance is moved into maintenance state immediately, killing any running methods. If flags is SMF_TEMPORARY, the change to maintenance state is a temporary change, lasting only for the lifetime of the current system instance. The flags argument is set to 0 if no flags are to be use.

The smf_degrade_instance() function moves an online service instance into the degraded state. This function operates only on instances in the online state. The flags argument is set to 0 if no flags are to be use. The only available flag is SMF_IMMEDIATE, which causes the instance to be moved into the degraded state immediately.

The smf_restore_instance() function brings an instance currently in the maintenance to the uninitialized state, so that it can be brought back online. For a service in the degraded state, smf_restore_instance() brings the specified instance back to the online state.

The smf_get_state() function returns a pointer to a string containing the name of the instance's current state. The user is responsible for freeing this string. Possible state strings are defined as the following:


#define SCF_STATE_STRING_UNINIT         ((const char *)"uninitialized")
#define SCF_STATE_STRING_MAINT          ((const char *)"maintenance")
#define SCF_STATE_STRING_OFFLINE        ((const char *)"offline")
#define SCF_STATE_STRING_DISABLED       ((const char *)"disabled")
#define SCF_STATE_STRING_ONLINE         ((const char *)"online")
#define SCF_STATE_STRING_DEGRADED       ((const char *)"degraded")

Upon successful completion, smf_enable_instance(), smf_disable_instance(), smf_disable_instance_with_comment(), smf_refresh_instance(), smf_restart_instance(), smf_maintain_instance(), smf_degrade_instance(), and smf_restore_instance() return 0. Otherwise, they return -1.

Upon successful completion, smf_get_state returns an allocated string. Otherwise, it returns NULL.

These functions will fail if:

SCF_ERROR_NO_MEMORY

The memory allocation failed.

SCF_ERROR_INVALID_ARGUMENT

The instance FMRI or flags argument is invalid.

SCF_ERROR_NOT_FOUND

The FMRI is valid but there is no matching instance found.

SCF_ERROR_CONNECTION_BROKEN

The connection to repository was broken.

SCF_ERROR_NO_RESOURCES

The server has insufficient resources.

The smf_maintain_instance(), smf_refresh_instance(), smf_restart_instance(), smf_degrade_instance(), and smf_restore_instance() functions will fail if:

SCF_ERROR_PERMISSION_DENIED

User does not have proper authorizations. See smf_security(7).

SCF_ERROR_BACKEND_ACCESS

The repository's backend refused access.

SCF_ERROR_BACKEND_READONLY

The repository's backend is read-only.

The smf_restore_instance() and smf_degrade_instance() functions will fail if:

SCF_ERROR_CONSTRAINT_VIOLATED

The function is called on an instance in an inappropriate state.

The scf_error(3SCF) function can be used to retrieve the error value.

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE
Interface Stability Committed
MT-Level Safe

svcs(1), libscf(3LIB), scf_error(3SCF), attributes(7), smf_security(7), svc.startd(8)
May 15, 2020 OmniOS