Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

sam_initialize(3) [centos 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_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)

Check Out this Related Man Page

VOTEQUORUM_QDEVICE_MASTER_WINS(3)		    Corosync Cluster Engine Programmer's Manual 		 VOTEQUORUM_QDEVICE_MASTER_WINS(3)

NAME
votequorum_qdevice_master_wins - Sets or clears quorum device master_wins flag SYNOPSIS
#include <corosync/votequorum.h> int votequorum_qdevice_master_wins(votequorum_handle_t handle const char name, unsigned int allow); DESCRIPTION
The votequorum_qdevice_master_wins informs votequorum whether or not the currently registered qdevice subsystem supports 'master_wins' mode (default 0). This mode allows the qdevice to effectively take over the quorum calculations of votequorum. Any node with an active qdevice that also has master_wins set becomes quorate regardless of the node votes of the cluster. It is left up to the qdevice subsystem itself (not part of votequorum) to communicate across the nodes or otherwise provide some system of deciding which nodes will be part of the quo- rate cluster, if any. eg They may be the set of nodes that has access to a quorum disk. name The name of the currently registered quorum device on this node. This must match the existing name known to votequorum. allow 0 (the default) means that master_wins is not active on this node. 1 means that master_wins is active on this node. RETURN VALUE
This call returns the CS_OK value if successful, otherwise an error is returned. ERRORS
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 SEE ALSO
votequorum_overview(8), votequorum_initialize(3), votequorum_finalize(3), votequorum_getinfo(3), votequorum_trackstart(3), votequo- rum_trackstop(3), votequorum_fd_get(3), votequorum_dispatch(3), votequorum_context_set(3), votequorum_context_get(3), votequorum_setex- pected(3), votequorum_setvotes(3), votequorum_qdevice_register(3), votequorum_qdevice_poll(3), votequorum_qdevice_update(3), corosync Man Page 2014-06-10 VOTEQUORUM_QDEVICE_MASTER_WINS(3)
Man Page

Featured Tech Videos