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SAM_HC_CALLBACK_REGISTER(3) Corosync Cluster Engine Programmer's Manual SAM_HC_CALLBACK_REGISTER(3)
NAME
sam_hc_callback_register - Register health check callback
SYNOPSIS
#include <corosync/sam.h>
cs_error_t sam_hc_callback_register (sam_hc_callback_t cb);
DESCRIPTION
The sam_hc_callback_register function is used to register a user provided healthcheck callback. After calling of this function, the SAM is
switched from application driven healthchecking to event driven healthchecking. In this mode, sam_hc_send(3) does not need to be executed.
The parameter cb is callback function of type sam_hc_callback_t defined as:
typedef int (*sam_hc_callback_t)(void);
This function will be regulargly called and must return 0 if the process is functioning normally, or -1 if the process is executing abnor-
mally. When -1 is returned, the SAM server execute the registered recovery policy.
A value of NULL can be passed into this function to switch into application driven healthchecking. cb to NULL.
RETURN VALUE
This call return CS_OK value if successful, otherwise and error is returned.
ERRORS
CS_ERR_BAD_HANDLE
SAM was not initialized and registered or health checking is in running state
CS_ERR_LIBRARY
internal library call failed. This can occur during fork() or pipe () system calls and the errno variable can be read to retrieve
more information.
SEE ALSO
sam_start(3), sam_stop(3), sam_hc_send(3), sam_register(3),
corosync Man Page 12/01/2009 SAM_HC_CALLBACK_REGISTER(3)