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 abnormally. 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.