SAM_REGISTER(3) Corosync Cluster Engine Programmer's Manual SAM_REGISTER(3)

NAME

sam_rehister - Register component for health checking

SYNOPSIS

#include <corosync/sam.h>


cs_error_t sam_register (unsigned int *instance_id);

DESCRIPTION

The sam_register function is used to register a process for
healthchecking. If recovery policy is set to
SAM_RECOVERY_POLICY_RESTART and recovery action will be taken, the
new process instance will begin execution at the next code line after
this function is called.


This function can be called only once and SAM must be initialized by
sam_initialize(3) function.


The instance_id argument is a pointer to a value storing the current
iteration instance. If this parameter is NULL, no instance_id is
returned. and then, no instance_id will be returned. This value
starts at 0 for the first iteration instance, and increases by 1 each
time a recovery restart is executed. After reaching MAX_INT, the
instance_id will reset to 0.


The placement of this function is important because after it is
called, the process id will change.


After registration, event driven health checking is not running.

RETURN VALUE

This call return CS_OK value if successful, otherwise and error is
returned.

ERRORS

CS_ERR_BAD_HANDLE
health checking was not started by calling sam_start(3)
function.

CS_ERR_LIBRARY
internal library call failed. This can be one of pipe creation
or fork. It's possible to get more information from errno.

SEE ALSO

sam_start(3), sam_initialize(3), sam_hc_callback_register(3)

CS_ERR_TRY_AGAIN Resource temporarily unavailable

CS_ERR_INVALID_PARAM Invalid argument

CS_ERR_ACCESS Permission denied

CS_ERR_LIBRARY The connection failed

CS_ERR_INTERRUPT System call interrupted by a signal

CS_ERR_NOT_SUPPORTED The requested protocol/functionality not
supported

CS_ERR_MESSAGE_ERROR Incorrect auth message received

CS_ERR_NO_MEMORY Not enough memory to complete the requested task

corosync Man Page 12/01/2009 SAM_REGISTER(3)