sam_initialize(3) [debian man page]
SAM_INITIALIZE(3) Corosync Cluster Engine Programmer's Manual SAM_INITIALIZE(3) 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 ini- tialize 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_t; where SAM_RECOVERY_POLICY_QUIT on failure, the process will terminate. SAM_RECOVERY_POLICY_RESTART on failure, the process will restart. 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) corosync Man Page 12/01/2009 SAM_INITIALIZE(3)
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SAM_INITIALIZE(3) Corosync Cluster Engine Programmer's Manual SAM_INITIALIZE(3) 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 ini- tialize 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 quo- rum 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 inturrupted by a signal CS_ERR_NOT_SUPPORTED The requested protocol/functuality not supported CS_ERR_MESSAGE_ERROR Incorrect auth message received CS_ERR_NO_MEMORY Not enough memory to completed the requested task corosync Man Page 21/05/2010 SAM_INITIALIZE(3)