cs_error_t sam_register (
unsigned int *instance_id)
{
cs_error_t error;
pid_t pid;
int pipe_error;
int pipe_fd[2];
enum sam_parent_action_t action;
int child_status;
if (sam_internal_data.internal_status != SAM_INTERNAL_STATUS_INITIALIZED) {
return (CS_ERR_BAD_HANDLE);
}
error = CS_OK;
while (1) {
pipe_error = pipe (pipe_fd);
if (pipe_error != 0) {
/*
* Pipe creation error
*/
error = CS_ERR_LIBRARY;
goto error_exit;
}
sam_internal_data.instance_id++;
sam_internal_data.term_send = 0;
pid = fork ();
if (pid == -1) {
/*
* Fork error
*/
sam_internal_data.instance_id--;
error = CS_ERR_LIBRARY;
goto error_exit;
}
if (pid == 0) {
/*
* Child process
*/
close (pipe_fd[0]);
sam_internal_data.parent_fd = pipe_fd[1];
if (instance_id)
*instance_id = sam_internal_data.instance_id;
sam_internal_data.internal_status = SAM_INTERNAL_STATUS_REGISTERED;
goto error_exit;
} else {
/*
* Parent process
*/
close (pipe_fd[1]);
action = sam_parent_handler (pipe_fd[0], pid);
close (pipe_fd[0]);
if (action == SAM_PARENT_ACTION_ERROR) {
error = CS_ERR_LIBRARY;
goto error_exit;
}
/*
* We really don't like zombies
*/
while (waitpid (pid, &child_status, 0) == -1 && errno == EINTR)
;
if (action == SAM_PARENT_ACTION_RECOVERY) {
if (sam_internal_data.recovery_policy == SAM_RECOVERY_POLICY_QUIT)
action = SAM_PARENT_ACTION_QUIT;
}
if (action == SAM_PARENT_ACTION_QUIT) {
exit (WEXITSTATUS (child_status));
}
}
}
error_exit:
return (error);
}
cs_error_t sam_register (
unsigned int *instance_id)
{
cs_error_t error;
pid_t pid;
int pipe_error;
int pipe_fd_out[2], pipe_fd_in[2];
enum sam_parent_action_t action, old_action;
int child_status;
sam_recovery_policy_t recpol;
if (sam_internal_data.internal_status != SAM_INTERNAL_STATUS_INITIALIZED) {
return (CS_ERR_BAD_HANDLE);
}
recpol = sam_internal_data.recovery_policy;
if (recpol & SAM_RECOVERY_POLICY_CONFDB) {
/*
* Register to objdb
*/
if ((error = sam_confdb_register ()) != CS_OK) {
goto error_exit;
}
}
error = CS_OK;
while (1) {
if ((pipe_error = pipe (pipe_fd_out)) != 0) {
error = CS_ERR_LIBRARY;
goto error_exit;
}
if ((pipe_error = pipe (pipe_fd_in)) != 0) {
close (pipe_fd_out[0]);
close (pipe_fd_out[1]);
error = CS_ERR_LIBRARY;
goto error_exit;
}
if (recpol & SAM_RECOVERY_POLICY_CONFDB) {
if ((error = sam_confdb_update_key (SAM_CONFDB_KEY_STATE, SAM_CONFDB_S_REGISTERED)) != CS_OK) {
goto error_exit;
}
}
sam_internal_data.instance_id++;
sam_internal_data.term_send = 0;
pid = fork ();
if (pid == -1) {
/*
* Fork error
*/
sam_internal_data.instance_id--;
error = CS_ERR_LIBRARY;
goto error_exit;
}
if (pid == 0) {
/*
* Child process
*/
close (pipe_fd_out[0]);
close (pipe_fd_in[1]);
sam_internal_data.child_fd_out = pipe_fd_out[1];
sam_internal_data.child_fd_in = pipe_fd_in[0];
if (instance_id)
*instance_id = sam_internal_data.instance_id;
sam_internal_data.am_i_child = 1;
sam_internal_data.internal_status = SAM_INTERNAL_STATUS_REGISTERED;
pthread_mutex_init (&sam_internal_data.lock, NULL);
goto error_exit;
} else {
/*
* Parent process
*/
close (pipe_fd_out[1]);
close (pipe_fd_in[0]);
action = sam_parent_handler (pipe_fd_out[0], pipe_fd_in[1], pid);
close (pipe_fd_out[0]);
close (pipe_fd_in[1]);
if (action == SAM_PARENT_ACTION_ERROR) {
error = CS_ERR_LIBRARY;
goto error_exit;
}
/*
* We really don't like zombies
*/
while (waitpid (pid, &child_status, 0) == -1 && errno == EINTR)
;
old_action = action;
if (action == SAM_PARENT_ACTION_RECOVERY) {
if (SAM_RP_MASK (sam_internal_data.recovery_policy) == SAM_RECOVERY_POLICY_QUIT)
action = SAM_PARENT_ACTION_QUIT;
}
if (action == SAM_PARENT_ACTION_QUIT) {
if (recpol & SAM_RECOVERY_POLICY_QUORUM) {
quorum_finalize (sam_internal_data.quorum_handle);
}
if (recpol & SAM_RECOVERY_POLICY_CONFDB) {
if (old_action == SAM_PARENT_ACTION_RECOVERY) {
/*
* Mark as failed
*/
sam_confdb_update_key (SAM_CONFDB_KEY_STATE, SAM_CONFDB_S_FAILED);
} else {
sam_confdb_destroy_pid_obj ();
}
}
exit (WEXITSTATUS (child_status));
}
}
}
error_exit:
return (error);
}
