Add a restart action to a condition
#include <ha/ham.h> ham_action_t *ham_action_restart( ham_condition_t *chdl, const char *aname, const char *path, unsigned flags);
You use the ham_action_restart() function to add an action (aname) to a given condition. In this case, the action will restart a program that has died.
|Restart actions can be associated only with death conditions
Note also that there can be only one restart action over all the death conditions in an entity.
The handle (chdl) is obtained either:
You use the path parameter to specify the external program or command line to be executed — path must contain the FULL path to the executable along with all parameters to be passed to it. If either the pathname or the arguments contain spaces that need to be passed on literally to the spawn call, they need to be quoted. As long as the subcomponents within the path arguments are quoted, using either of the following methods:
\'path with space\'
\"path with space\",
the following is allowed:
"\'path with space\' arg1 arg2 \"arg3 with space\"".
This would be parsed as
"path with space" -> path arg1 = arg1 arg2 = arg2 arg3 = "arg3 with space".
The command line is in turn passed onto a spawn command by the HAM to create a new process that will execute the command.
The action is executed when the appropriate condition is triggered.
Note that this action also triggers a restart condition in the entity.
Currently the following flags are defined:
Users can specify what will be done if an action fails. By adding action fail actions to a list associated with an action, users can determine what will be done in the case of an action failure. For every action that fails, the corresponding action fail list will be executed. Certain actions (e.g. ham_action_log() and ham_action_heartbeat_healthy()) never fail. For more details, refer to the appropriate section in the HAM API reference for the ham_action_fail_*() calls.
A valid handle to an action in a condition, or NULL if an error occurred (errno is set).
The connection to the HAM is invalid. This happens when the process that opened the connection (using ham_connect()) and the process that's calling ham_action_restart() aren't the same.
In addition to the above errors, the HAM returns any error it encounters while servicing this request.
ham_action_execute(), ham_action_notify_pulse(), ham_action_notify_signal(), ham_action_remove(), ham_action_waitfor(), ham_condition(), ham_condition_handle()