int flom_init_check(void)
{
int mutex_locked = FALSE;
int ret_cod = FLOM_RC_OK;
/* initialize only if not already initialized! */
if (!flom_init_flag) {
/* this is a synchronization hole... see below */
/* synchronize this critical section */
g_static_mutex_lock(&flom_init_mutex);
mutex_locked = TRUE;
/* dummy loop, necessary because I need break instruction ;) */
while (TRUE) {
/* stop if another thread performed initialization in the
during synchronization hole (unlikely but not impossible) */
if (flom_init_flag)
break;
/* initialize trace component */
FLOM_TRACE_INIT;
/* initialize regular expression table */
if (FLOM_RC_OK != (ret_cod = global_res_name_preg_init()))
break;
/* reset global configuration */
flom_config_reset(NULL);
/* initialize configuration with standard system, standard
user and user customized config files */
if (FLOM_RC_OK != (ret_cod = flom_config_init(NULL, NULL)))
break;
if (NULL != flom_config_get_command_trace_file(NULL))
/* change trace destination if necessary */
FLOM_TRACE_REOPEN(flom_config_get_command_trace_file(NULL),
flom_config_get_append_trace_file(NULL));
/* check configuration */
if (FLOM_RC_OK != (ret_cod = flom_config_check(NULL)))
break;
/* initialization completed */
flom_init_flag = TRUE;
/* exit loop after exactly one cycle */
break;
} /* while (TRUE) */
} /* if (!flom_init_flag) */
if (mutex_locked)
g_static_mutex_unlock(&flom_init_mutex);
return ret_cod;
}
int main (int argc, char *argv[])
{
GError *error = NULL;
GOptionContext *option_context;
int child_status = 0;
int ret_cod = FLOM_RC_INTERNAL_ERROR;
struct flom_conn_data_s cd;
char locked_element[100];
option_context = g_option_context_new("[-- command to execute]");
g_option_context_add_main_entries(option_context, entries, NULL);
if (!g_option_context_parse(option_context, &argc, &argv, &error)) {
g_print("option parsing failed: %s\n", error->message);
exit(FLOM_ES_GENERIC_ERROR);
}
g_option_context_free(option_context);
if (print_version) {
g_print("FLoM: Free LOck Manager\n"
"Copyright (c) 2013-2014, Christian Ferrari; "
"all rights reserved.\n"
"License: GPL (GNU Public License) version 2\n"
"Package name: %s; package version: %s; release date: %s\n"
"Access http://sourceforge.net/projects/flom/ for "
"project community activities\n",
FLOM_PACKAGE_NAME, FLOM_PACKAGE_VERSION, FLOM_PACKAGE_DATE);
exit(FLOM_ES_OK);
}
/* initialize trace destination if necessary */
FLOM_TRACE_INIT;
/* initialize regular expression table */
if (FLOM_RC_OK != (ret_cod = global_res_name_preg_init())) {
g_print("global_res_name_preg_init: ret_cod=%d\n", ret_cod);
exit(FLOM_ES_GENERIC_ERROR);
}
/* reset global configuration */
flom_config_reset(NULL);
/* initialize configuration with standard system, standard user and
user customized config files */
if (FLOM_RC_OK != (ret_cod = flom_config_init(NULL, config_file))) {
g_print("flom_config_init: ret_cod=%d\n", ret_cod);
exit(FLOM_ES_GENERIC_ERROR);
}
/* overrides configuration with command line passed arguments */
if (NULL != daemon_trace_file)
flom_config_set_daemon_trace_file(NULL, daemon_trace_file);
if (NULL != command_trace_file)
flom_config_set_command_trace_file(NULL, command_trace_file);
if (verbose)
flom_config_set_verbose(NULL, verbose);
if (NULL != resource_name)
if (FLOM_RC_OK != (ret_cod = flom_config_set_resource_name(
NULL, resource_name))) {
g_print("flom_config_set_resource_name: ret_cod=%d\n", ret_cod);
exit(FLOM_ES_GENERIC_ERROR);
}
if (0 > resource_quantity)
g_warning("Resource quantity ignored because negative values (%d) "
"are meaningless\n", resource_quantity);
else if (0 < resource_quantity)
flom_config_set_resource_quantity(NULL, resource_quantity);
if (NULL != resource_wait) {
flom_bool_value_t fbv;
if (FLOM_BOOL_INVALID == (
fbv = flom_bool_value_retrieve(resource_wait))) {
g_print("resource-wait: '%s' is an invalid value\n",
resource_wait);
exit(FLOM_ES_GENERIC_ERROR);
}
flom_config_set_resource_wait(NULL, fbv);
}
if (FLOM_NETWORK_WAIT_TIMEOUT != resource_timeout) {
/* timeout is useless if no wait was specified */
if (FLOM_BOOL_NO == flom_config_get_resource_wait(NULL))
g_warning("Timeout ignored because 'no wait' behavior was "
"specified\n");
else
flom_config_set_resource_timeout(NULL, resource_timeout);
}
if (NULL != lock_mode) {
flom_lock_mode_t flm;
if (FLOM_LOCK_MODE_INVALID == (
flm = flom_lock_mode_retrieve(lock_mode))) {
g_print("lock-mode: '%s' is an invalid value\n", lock_mode);
exit(FLOM_ES_GENERIC_ERROR);
}
flom_config_set_lock_mode(NULL, flm);
}
if (NULL != resource_create) {
flom_bool_value_t fbv;
if (FLOM_BOOL_INVALID == (
fbv = flom_bool_value_retrieve(resource_create))) {
g_print("resource-create: '%s' is an invalid value\n",
resource_create);
exit(FLOM_ES_GENERIC_ERROR);
}
flom_config_set_resource_create(NULL, fbv);
}
flom_config_set_resource_idle_lifespan(NULL, resource_idle_lifespan);
if (NULL != socket_name) {
if (FLOM_RC_OK != (ret_cod = flom_config_set_socket_name(
NULL, socket_name))) {
g_print("socket-name: '%s' is an invalid value\n", socket_name);
g_print("flom_client_connect: ret_cod=%d (%s)\n",
ret_cod, flom_strerror(ret_cod));
exit(FLOM_ES_GENERIC_ERROR);
}
}
if (_DEFAULT_DAEMON_LIFESPAN != daemon_lifespan) {
flom_config_set_lifespan(NULL, daemon_lifespan);
}
if (NULL != unicast_address) {
flom_config_set_unicast_address(NULL, unicast_address);
}
if (_DEFAULT_DAEMON_PORT != unicast_port) {
flom_config_set_unicast_port(NULL, unicast_port);
}
if (NULL != multicast_address) {
flom_config_set_multicast_address(NULL, multicast_address);
}
if (_DEFAULT_DAEMON_PORT != multicast_port) {
flom_config_set_multicast_port(NULL, multicast_port);
}
if (_DEFAULT_DISCOVERY_ATTEMPTS != discovery_attempts) {
flom_config_set_discovery_attempts(NULL, discovery_attempts);
}
if (_DEFAULT_DISCOVERY_TIMEOUT != discovery_timeout) {
flom_config_set_discovery_timeout(NULL, discovery_timeout);
}
if (_DEFAULT_DISCOVERY_TTL != discovery_ttl) {
flom_config_set_discovery_ttl(NULL, discovery_ttl);
}
if (_DEFAULT_TCP_KEEPALIVE_TIME != tcp_keepalive_time) {
flom_config_set_tcp_keepalive_time(NULL, tcp_keepalive_time);
}
if (_DEFAULT_TCP_KEEPALIVE_INTVL != tcp_keepalive_intvl) {
flom_config_set_tcp_keepalive_intvl(NULL, tcp_keepalive_intvl);
}
if (_DEFAULT_TCP_KEEPALIVE_PROBES != tcp_keepalive_probes) {
flom_config_set_tcp_keepalive_probes(NULL, tcp_keepalive_probes);
}
if (NULL != flom_config_get_command_trace_file(NULL))
/* change trace destination if necessary */
FLOM_TRACE_REOPEN(flom_config_get_command_trace_file(NULL));
/* print configuration */
if (flom_config_get_verbose(NULL))
flom_config_print(NULL);
/* check configuration */
if (FLOM_RC_OK != (ret_cod = flom_config_check(NULL))) {
g_warning("Configuration is not valid, cannot go on!\n");
exit(FLOM_ES_GENERIC_ERROR);
}
/* check if the command is asking daemon termination */
if (quiesce_exit || immediate_exit) {
g_print("Starting FLoM daemon %s shutdown...\n",
immediate_exit ? "immediate" : "quiesce");
flom_client_shutdown(NULL, immediate_exit);
exit(0);
}
/* check the command is not null */
if (NULL == command_argv) {
g_warning("No command to execute!\n");
exit(FLOM_ES_UNABLE_TO_EXECUTE_COMMAND);
}
/* open connection to a valid flom lock manager... */
if (FLOM_RC_OK != (ret_cod = flom_client_connect(NULL, &cd, TRUE))) {
g_print("flom_client_connect: ret_cod=%d (%s)\n",
ret_cod, flom_strerror(ret_cod));
exit(FLOM_ES_GENERIC_ERROR);
}
/* sending lock command */
ret_cod = flom_client_lock(NULL, &cd,
flom_config_get_resource_timeout(NULL),
locked_element, sizeof(locked_element));
switch (ret_cod) {
case FLOM_RC_OK: /* OK, go on */
if (flom_config_get_verbose(NULL) && '\0' != locked_element[0])
g_print("Locked element is '%s'\n", locked_element);
break;
case FLOM_RC_LOCK_BUSY: /* busy */
g_print("Resource already locked, the lock cannot be obtained\n");
/* gracefully disconnect from daemon */
if (FLOM_RC_OK != (ret_cod = flom_client_disconnect(&cd))) {
g_print("flom_client_unlock: ret_cod=%d (%s)\n",
ret_cod, flom_strerror(ret_cod));
}
exit(FLOM_ES_RESOURCE_BUSY);
break;
case FLOM_RC_LOCK_CANT_WAIT: /* can't wait, leaving... */
g_print("The resource could be available in the future, but the "
"requester can't wait\n");
/* gracefully disconnect from daemon */
if (FLOM_RC_OK != (ret_cod = flom_client_disconnect(&cd))) {
g_print("flom_client_unlock: ret_cod=%d (%s)\n",
ret_cod, flom_strerror(ret_cod));
}
exit(FLOM_ES_REQUESTER_CANT_WAIT);
break;
case FLOM_RC_LOCK_IMPOSSIBLE: /* impossible */
g_print("Resource will never satisfy the request, the lock "
"cannot be obtained\n");
/* gracefully disconnect from daemon */
if (FLOM_RC_OK != (ret_cod = flom_client_disconnect(&cd))) {
g_print("flom_client_unlock: ret_cod=%d (%s)\n",
ret_cod, flom_strerror(ret_cod));
}
exit(FLOM_ES_GENERIC_ERROR);
break;
case FLOM_RC_NETWORK_TIMEOUT: /* timeout expired, busy resource */
g_print("The lock was not obtained because timeout "
"(%d milliseconds) expired\n",
flom_config_get_resource_timeout(NULL));
/* gracefully disconnect from daemon */
if (FLOM_RC_OK != (ret_cod = flom_client_disconnect(&cd))) {
g_print("flom_client_unlock: ret_cod=%d (%s)\n",
ret_cod, flom_strerror(ret_cod));
}
exit(FLOM_ES_RESOURCE_BUSY);
break;
default:
g_print("flom_client_lock: ret_cod=%d (%s)\n",
ret_cod, flom_strerror(ret_cod));
exit(FLOM_ES_GENERIC_ERROR);
} /* switch (ret_cod) */
/* execute the command */
if (FLOM_RC_OK != (ret_cod = flom_exec(command_argv, locked_element,
&child_status))) {
guint i, num;
g_print("Unable to execute command: '");
num = g_strv_length(command_argv);
for (i=0; i<num; ++i)
g_print("%s", command_argv[i]);
g_print("'\n");
exit(FLOM_ES_UNABLE_TO_EXECUTE_COMMAND);
}
/* sending unlock command */
if (FLOM_RC_OK != (ret_cod = flom_client_unlock(NULL, &cd))) {
g_print("flom_client_unlock: ret_cod=%d (%s)\n",
ret_cod, flom_strerror(ret_cod));
exit(FLOM_ES_GENERIC_ERROR);
}
/* gracefully disconnect from daemon */
if (FLOM_RC_OK != (ret_cod = flom_client_disconnect(&cd))) {
g_print("flom_client_unlock: ret_cod=%d (%s)\n",
ret_cod, flom_strerror(ret_cod));
}
g_strfreev (command_argv);
command_argv = NULL;
/* release config data */
flom_config_free(NULL);
/* release regular expression data */
global_res_name_preg_free();
return child_status;
}