Provided by: corosync-dev_1.4.2-2_amd64
sam_hc_callback_register - Register health check callback
#include <corosync/sam.h> cs_error_t sam_hc_callback_register (sam_hc_callback_t cb);
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.
This call return CS_OK value if successful, otherwise and error is returned.
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.
sam_start(3), sam_stop(3), sam_hc_send(3), sam_register(3),