NAME

       sam_initialize - Initialize health checking

SYNOPSIS

       #include <corosync/sam.h>

       cs_error_t sam_initialize (int time_interval, sam_recovery_policy_t recovery_policy);

DESCRIPTION

       The sam_initialize function is used to initialize health checking of a process.

       Application  can  have  only  one instance of SAM. This function must be called before any
       other of SAM functions.  It is recommended to initialize before  the  process  begins  any
       process initialization.

       The  time_interval  parameter  is  a timeout in milliseconds before taking recovery action
       after having not received a healthcheck.

       If time_interval parameter is zero, there is no time limit and no healthcheck must be sent
       by  the process.  In this operational mode, a process failure will continue to execute the
       recovery policy.

       The recovery_policy is defined as type:

         typedef enum {
            SAM_RECOVERY_POLICY_QUIT = 1,
            SAM_RECOVERY_POLICY_RESTART = 2,
               SAM_RECOVERY_POLICY_QUORUM = 0x08,
               SAM_RECOVERY_POLICY_QUORUM_QUIT = SAM_RECOVERY_POLICY_QUORUM | SAM_RECOVERY_POLICY_QUIT,
               SAM_RECOVERY_POLICY_QUORUM_RESTART = SAM_RECOVERY_POLICY_QUORUM | SAM_RECOVERY_POLICY_RESTART,
               SAM_RECOVERY_POLICY_CMAP = 0x10,
               SAM_RECOVERY_POLICY_CONFDB = 0x10,
         } sam_recovery_policy_t;

       where

       SAM_RECOVERY_POLICY_QUIT
              on failure, the process will terminate.

       SAM_RECOVERY_POLICY_RESTART
              on failure, the process will restart.

       SAM_RECOVERY_POLICY_QUORUM
              is not policy. Used only as flag meaning quorum integration

       SAM_RECOVERY_POLICY_QUORUM_QUIT
              same as SAM_RECOVERY_POLICY_QUIT  but  sam_start  (3)  will  block  until  corosync
              becomes quorate and process will be terminated if quorum is lost.

       SAM_RECOVERY_POLICY_QUORUM_RESTART
              same  as  SAM_RECOVERY_POLICY_RESTART  but  sam_start (3) will block until corosync
              becomes quorate and process will be restarted if quorum is lost.

       SAM_RECOVERY_POLICY_CMAP
              is not policy. Used only as flag meaning cmap integration. It can be used with  all
              previous  policies.   For  backward  compatibility, SAM_RECOVERY_POLICY_CONFDB with
              same meaning as SAM_RECOVERY_POLICY_CMAP is also provided.

       To perform event driven healthchecking, sam_register(3) and  sam_start(3)  functions  must
       called.   Event driven healthchecking causes the duplicate standby process running the SAM
       serve rto periodically request healthchecks from the active process.

RETURN VALUE

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

ERRORS

       CS_ERR_BAD_HANDLE
              can happened in case of double initialization.

       CS_ERR_INVALID_PARAM
              recovery_policy has invalid value.

SEE ALSO

       sam_register(3), sam_start(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