X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Funixsock.c;h=f8dcc5ba6b5e6c864572101a861cf465ecb8f211;hb=1d3482c65a00342de681e777c74108734ece0eab;hp=e6017ef2584b532e85088f2c82087c50fee8bbed;hpb=b32df633638e1869ecba45290bf502b243092241;p=collectd.git

diff --git a/src/unixsock.c b/src/unixsock.c
index e6017ef2..f8dcc5ba 100644
--- a/src/unixsock.c
+++ b/src/unixsock.c
@@ -23,14 +23,14 @@
 #include "common.h"
 #include "plugin.h"
 #include "configfile.h"
-#include "utils_debug.h"
+#include "utils_cmd_putval.h"
 
 /* Folks without pthread will need to disable this plugin. */
 #include <pthread.h>
 
 #include <sys/socket.h>
+#include <sys/stat.h>
 #include <sys/un.h>
-#include <sys/poll.h>
 
 #include <grp.h>
 
@@ -38,7 +38,7 @@
 # define UNIX_PATH_MAX sizeof (((struct sockaddr_un *)0)->sun_path)
 #endif
 
-#define US_DEFAULT_PATH PREFIX"/var/run/"PACKAGE_NAME"-unixsock"
+#define US_DEFAULT_PATH LOCALSTATEDIR"/run/"PACKAGE_NAME"-unixsock"
 
 /*
  * Private data structures
@@ -68,13 +68,15 @@ static const char *config_keys[] =
 };
 static int config_keys_num = 3;
 
+static int loop = 0;
+
 /* socket configuration */
 static int   sock_fd    = -1;
 static char *sock_file  = NULL;
 static char *sock_group = NULL;
 static int   sock_perms = S_IRWXU | S_IRWXG;
 
-static pthread_t listen_thread = -1;
+static pthread_t listen_thread = (pthread_t) 0;
 
 /* Linked list and auxilliary variables for saving values */
 static value_cache_t   *cache_head = NULL;
@@ -97,65 +99,44 @@ static value_cache_t *cache_search (const char *name)
 	return (vc);
 } /* value_cache_t *cache_search */
 
-static int cache_alloc_name (char *ret, int ret_len,
-		const char *hostname,
-		const char *plugin, const char *plugin_instance,
-		const char *type, const char *type_instance)
-{
-	int  status;
-
-	assert (plugin != NULL);
-	assert (type != NULL);
-
-	if ((plugin_instance == NULL) || (strlen (plugin_instance) == 0))
-	{
-		if ((type_instance == NULL) || (strlen (type_instance) == 0))
-			status = snprintf (ret, ret_len, "%s/%s/%s",
-					hostname, plugin, type);
-		else
-			status = snprintf (ret, ret_len, "%s/%s/%s-%s",
-					hostname, plugin, type, type_instance);
-	}
-	else
-	{
-		if ((type_instance == NULL) || (strlen (type_instance) == 0))
-			status = snprintf (ret, ret_len, "%s/%s-%s/%s",
-					hostname, plugin, plugin_instance, type);
-		else
-			status = snprintf (ret, ret_len, "%s/%s-%s/%s-%s",
-					hostname, plugin, plugin_instance, type, type_instance);
-	}
-
-	if ((status < 1) || (status >= ret_len))
-		return (-1);
-	return (0);
-} /* int cache_alloc_name */
-
 static int cache_insert (const data_set_t *ds, const value_list_t *vl)
 {
 	/* We're called from `cache_update' so we don't need to lock the mutex */
 	value_cache_t *vc;
 	int i;
 
-	DBG ("ds->ds_num = %i; vl->values_len = %i;",
-			ds->ds_num, vl->values_len);
+	DEBUG ("unixsock plugin: cache_insert: ds->type = %s; ds->ds_num = %i;"
+			" vl->values_len = %i;",
+			ds->type, ds->ds_num, vl->values_len);
+#if COLLECT_DEBUG
 	assert (ds->ds_num == vl->values_len);
+#else
+	if (ds->ds_num != vl->values_len)
+	{
+		ERROR ("unixsock plugin: ds->type = %s: (ds->ds_num = %i) != "
+				"(vl->values_len = %i)",
+				ds->type, ds->ds_num, vl->values_len);
+		return (-1);
+	}
+#endif
 
 	vc = (value_cache_t *) malloc (sizeof (value_cache_t));
 	if (vc == NULL)
 	{
+		char errbuf[1024];
 		pthread_mutex_unlock (&cache_lock);
-		syslog (LOG_ERR, "unixsock plugin: malloc failed: %s",
-				strerror (errno));
+		ERROR ("unixsock plugin: malloc failed: %s",
+				sstrerror (errno, errbuf, sizeof (errbuf)));
 		return (-1);
 	}
 
 	vc->gauge = (gauge_t *) malloc (sizeof (gauge_t) * vl->values_len);
 	if (vc->gauge == NULL)
 	{
+		char errbuf[1024];
 		pthread_mutex_unlock (&cache_lock);
-		syslog (LOG_ERR, "unixsock plugin: malloc failed: %s",
-				strerror (errno));
+		ERROR ("unixsock plugin: malloc failed: %s",
+				sstrerror (errno, errbuf, sizeof (errbuf)));
 		free (vc);
 		return (-1);
 	}
@@ -163,20 +144,19 @@ static int cache_insert (const data_set_t *ds, const value_list_t *vl)
 	vc->counter = (counter_t *) malloc (sizeof (counter_t) * vl->values_len);
 	if (vc->counter == NULL)
 	{
+		char errbuf[1024];
 		pthread_mutex_unlock (&cache_lock);
-		syslog (LOG_ERR, "unixsock plugin: malloc failed: %s",
-				strerror (errno));
+		ERROR ("unixsock plugin: malloc failed: %s",
+				sstrerror (errno, errbuf, sizeof (errbuf)));
 		free (vc->gauge);
 		free (vc);
 		return (-1);
 	}
 
-	if (cache_alloc_name (vc->name, sizeof (vc->name),
-				vl->host, vl->plugin, vl->plugin_instance,
-				ds->type, vl->type_instance) != 0)
+	if (FORMAT_VL (vc->name, sizeof (vc->name), vl, ds))
 	{
 		pthread_mutex_unlock (&cache_lock);
-		syslog (LOG_ERR, "unixsock plugin: cache_alloc_name failed.");
+		ERROR ("unixsock plugin: FORMAT_VL failed.");
 		free (vc->counter);
 		free (vc->gauge);
 		free (vc);
@@ -221,22 +201,31 @@ static int cache_update (const data_set_t *ds, const value_list_t *vl)
 	value_cache_t *vc;
 	int i;
 
-	if (cache_alloc_name (name, sizeof (name),
-				vl->host,
-				vl->plugin, vl->plugin_instance,
-				ds->type, vl->type_instance) != 0)
+	if (FORMAT_VL (name, sizeof (name), vl, ds) != 0)
 		return (-1);
 
 	pthread_mutex_lock (&cache_lock);
 
 	vc = cache_search (name);
 
+	/* pthread_mutex_lock is called by cache_insert. */
 	if (vc == NULL)
 		return (cache_insert (ds, vl));
 
 	assert (vc->values_num == ds->ds_num);
 	assert (vc->values_num == vl->values_len);
 
+	/* Avoid floating-point exceptions due to division by zero. */
+	if (vc->time >= vl->time)
+	{
+		pthread_mutex_unlock (&cache_lock);
+		ERROR ("unixsock plugin: vc->time >= vl->time. vc->time = %u; "
+				"vl->time = %u; vl = %s;",
+				(unsigned int) vc->time, (unsigned int) vl->time,
+				name);
+		return (-1);
+	} /* if (vc->time >= vl->time) */
+
 	/*
 	 * Update the values. This is possibly a lot more that you'd expect
 	 * because we honor min and max values and handle counter overflows here.
@@ -264,20 +253,12 @@ static int cache_update (const data_set_t *ds, const value_list_t *vl)
 					/ (vl->time - vc->time);
 			}
 
-			DBG ("name = %s; old counter: %llu; new counter: %llu; rate: %lf;",
-					name,
-					vc->counter[i], vl->values[i].counter,
-					vc->gauge[i]);
-
 			vc->counter[i] = vl->values[i].counter;
 		}
 		else if (ds->ds[i].type == DS_TYPE_GAUGE)
 		{
 			vc->gauge[i] = vl->values[i].gauge;
 			vc->counter[i] = 0;
-
-			DBG ("name, %s; gauge: %lf;",
-					name, vc->gauge[i]);
 		}
 		else
 		{
@@ -285,9 +266,9 @@ static int cache_update (const data_set_t *ds, const value_list_t *vl)
 			vc->counter[i] = 0;
 		}
 
-		if ((vc->gauge[i] == NAN)
-				|| ((ds->ds[i].min != NAN) && (vc->gauge[i] < ds->ds[i].min))
-				|| ((ds->ds[i].max != NAN) && (vc->gauge[i] > ds->ds[i].max)))
+		if (isnan (vc->gauge[i])
+				|| (!isnan (ds->ds[i].min) && (vc->gauge[i] < ds->ds[i].min))
+				|| (!isnan (ds->ds[i].max) && (vc->gauge[i] > ds->ds[i].max)))
 			vc->gauge[i] = NAN;
 	} /* for i = 0 .. ds->ds_num */
 
@@ -350,7 +331,7 @@ static void cache_flush (int max_age)
 	} /* while (this != NULL) */
 
 	pthread_mutex_unlock (&cache_lock);
-} /* int cache_flush */
+} /* void cache_flush */
 
 static int us_open_socket (void)
 {
@@ -360,8 +341,9 @@ static int us_open_socket (void)
 	sock_fd = socket (PF_UNIX, SOCK_STREAM, 0);
 	if (sock_fd < 0)
 	{
-		syslog (LOG_ERR, "unixsock plugin: socket failed: %s",
-				strerror (errno));
+		char errbuf[1024];
+		ERROR ("unixsock plugin: socket failed: %s",
+				sstrerror (errno, errbuf, sizeof (errbuf)));
 		return (-1);
 	}
 
@@ -371,23 +353,27 @@ static int us_open_socket (void)
 			sizeof (sa.sun_path) - 1);
 	/* unlink (sa.sun_path); */
 
+	DEBUG ("unixsock plugin: socket path = %s", sa.sun_path);
+
 	status = bind (sock_fd, (struct sockaddr *) &sa, sizeof (sa));
 	if (status != 0)
 	{
-		DBG ("bind failed: %s; sa.sun_path = %s",
-				strerror (errno), sa.sun_path);
-		syslog (LOG_ERR, "unixsock plugin: bind failed: %s",
-				strerror (errno));
+		char errbuf[1024];
+		sstrerror (errno, errbuf, sizeof (errbuf));
+		ERROR ("unixsock plugin: bind failed: %s", errbuf);
 		close (sock_fd);
 		sock_fd = -1;
 		return (-1);
 	}
 
+	chmod (sa.sun_path, sock_perms);
+
 	status = listen (sock_fd, 8);
 	if (status != 0)
 	{
-		syslog (LOG_ERR, "unixsock plugin: listen failed: %s",
-				strerror (errno));
+		char errbuf[1024];
+		ERROR ("unixsock plugin: listen failed: %s",
+				sstrerror (errno, errbuf, sizeof (errbuf)));
 		close (sock_fd);
 		sock_fd = -1;
 		return (-1);
@@ -395,29 +381,37 @@ static int us_open_socket (void)
 
 	do
 	{
+		char *grpname;
 		struct group *g;
+		struct group sg;
+		char grbuf[2048];
 
-		errno = 0;
-		g = getgrnam ((sock_group != NULL) ? sock_group : COLLECTD_GRP_NAME);
+		grpname = (sock_group != NULL) ? sock_group : COLLECTD_GRP_NAME;
+		g = NULL;
 
-		if (errno != 0)
+		status = getgrnam_r (grpname, &sg, grbuf, sizeof (grbuf), &g);
+		if (status != 0)
 		{
-			syslog (LOG_WARNING, "unixsock plugin: getgrnam (%s) failed: %s",
-					(sock_group != NULL) ? sock_group : COLLECTD_GRP_NAME,
-					strerror (errno));
+			char errbuf[1024];
+			WARNING ("unixsock plugin: getgrnam_r (%s) failed: %s", grpname,
+					sstrerror (errno, errbuf, sizeof (errbuf)));
 			break;
 		}
-
 		if (g == NULL)
+		{
+			WARNING ("unixsock plugin: No such group: `%s'",
+					grpname);
 			break;
+		}
 
 		if (chown ((sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
 					(uid_t) -1, g->gr_gid) != 0)
 		{
-			syslog (LOG_WARNING, "unixsock plugin: chown (%s, -1, %i) failed: %s",
+			char errbuf[1024];
+			WARNING ("unixsock plugin: chown (%s, -1, %i) failed: %s",
 					(sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
 					(int) g->gr_gid,
-					strerror (errno));
+					sstrerror (errno, errbuf, sizeof (errbuf)));
 		}
 	} while (0);
 
@@ -426,7 +420,7 @@ static int us_open_socket (void)
 
 static int us_handle_getval (FILE *fh, char **fields, int fields_num)
 {
-	char *hostname = fields[1];
+	char *hostname;
 	char *plugin;
 	char *plugin_instance;
 	char *type;
@@ -437,55 +431,52 @@ static int us_handle_getval (FILE *fh, char **fields, int fields_num)
 	int   i;
 
 	if (fields_num != 2)
-		return (-1);
-
-	plugin = strchr (hostname, '/');
-	if (plugin == NULL)
-		return (-1);
-	*plugin = '\0'; plugin++;
-
-	type = strchr (plugin, '/');
-	if (type == NULL)
-		return (-1);
-	*type = '\0'; type++;
-
-	plugin_instance = strchr (plugin, '-');
-	if (plugin_instance != NULL)
 	{
-		*plugin_instance = '\0';
-		plugin_instance++;
+		DEBUG ("unixsock plugin: Wrong number of fields: %i", fields_num);
+		fprintf (fh, "-1 Wrong number of fields: Got %i, expected 2.\n",
+				fields_num);
+		fflush (fh);
+		return (-1);
 	}
+	DEBUG ("unixsock plugin: Got query for `%s'", fields[1]);
 
-	type_instance = strchr (type, '-');
-	if (type_instance != NULL)
+	status = parse_identifier (fields[1], &hostname,
+			&plugin, &plugin_instance,
+			&type, &type_instance);
+	if (status != 0)
 	{
-		*type_instance = '\0';
-		type_instance++;
+		DEBUG ("unixsock plugin: Cannot parse `%s'", fields[1]);
+		fprintf (fh, "-1 Cannot parse identifier.\n");
+		fflush (fh);
+		return (-1);
 	}
 
-	status = cache_alloc_name (name, sizeof (name),
+	status = format_name (name, sizeof (name),
 			hostname, plugin, plugin_instance, type, type_instance);
 	if (status != 0)
+	{
+		fprintf (fh, "-1 format_name failed.\n");
 		return (-1);
+	}
 
 	pthread_mutex_lock (&cache_lock);
 
-	DBG ("vc = cache_search (%s)", name);
+	DEBUG ("vc = cache_search (%s)", name);
 	vc = cache_search (name);
 
 	if (vc == NULL)
 	{
-		DBG ("Did not find cache entry.");
+		DEBUG ("Did not find cache entry.");
 		fprintf (fh, "-1 No such value");
 	}
 	else
 	{
-		DBG ("Found cache entry.");
+		DEBUG ("Found cache entry.");
 		fprintf (fh, "%i", vc->values_num);
 		for (i = 0; i < vc->values_num; i++)
 		{
 			fprintf (fh, " %s=", vc->ds->ds[i].name);
-			if (vc->gauge[i] == NAN)
+			if (isnan (vc->gauge[i]))
 				fprintf (fh, "NaN");
 			else
 				fprintf (fh, "%12e", vc->gauge[i]);
@@ -501,10 +492,60 @@ static int us_handle_getval (FILE *fh, char **fields, int fields_num)
 	return (0);
 } /* int us_handle_getval */
 
+static int us_handle_listval (FILE *fh, char **fields, int fields_num)
+{
+	char buffer[1024];
+	char **value_list = NULL;
+	int value_list_len = 0;
+	value_cache_t *entry;
+	int i;
+
+	if (fields_num != 1)
+	{
+		DEBUG ("unixsock plugin: us_handle_listval: "
+				"Wrong number of fields: %i", fields_num);
+		fprintf (fh, "-1 Wrong number of fields: Got %i, expected 1.\n",
+				fields_num);
+		fflush (fh);
+		return (-1);
+	}
+
+	pthread_mutex_lock (&cache_lock);
+
+	for (entry = cache_head; entry != NULL; entry = entry->next)
+	{
+		char **tmp;
+
+		snprintf (buffer, sizeof (buffer), "%u %s\n",
+				(unsigned int) entry->time, entry->name);
+		buffer[sizeof (buffer) - 1] = '\0';
+		
+		tmp = realloc (value_list, sizeof (char *) * (value_list_len + 1));
+		if (tmp == NULL)
+			continue;
+		value_list = tmp;
+
+		value_list[value_list_len] = strdup (buffer);
+
+		if (value_list[value_list_len] != NULL)
+			value_list_len++;
+	} /* for (entry) */
+
+	pthread_mutex_unlock (&cache_lock);
+
+	DEBUG ("unixsock plugin: us_handle_listval: value_list_len = %i", value_list_len);
+	fprintf (fh, "%i Values found\n", value_list_len);
+	for (i = 0; i < value_list_len; i++)
+		fputs (value_list[i], fh);
+	fflush (fh);
+
+	return (0);
+} /* int us_handle_listval */
+
 static void *us_handle_client (void *arg)
 {
 	int fd;
-	FILE *fh;
+	FILE *fhin, *fhout;
 	char buffer[1024];
 	char *fields[128];
 	int   fields_num;
@@ -513,18 +554,29 @@ static void *us_handle_client (void *arg)
 	free (arg);
 	arg = NULL;
 
-	DBG ("Reading from fd #%i", fd);
+	DEBUG ("Reading from fd #%i", fd);
 
-	fh = fdopen (fd, "r+");
-	if (fh == NULL)
+	fhin  = fdopen (fd, "r");
+	if (fhin == NULL)
 	{
-		syslog (LOG_ERR, "unixsock plugin: fdopen failed: %s",
-				strerror (errno));
+		char errbuf[1024];
+		ERROR ("unixsock plugin: fdopen failed: %s",
+				sstrerror (errno, errbuf, sizeof (errbuf)));
 		close (fd);
 		pthread_exit ((void *) 1);
 	}
 
-	while (fgets (buffer, sizeof (buffer), fh) != NULL)
+	fhout = fdopen (fd, "w");
+	if (fhout == NULL)
+	{
+		char errbuf[1024];
+		ERROR ("unixsock plugin: fdopen failed: %s",
+				sstrerror (errno, errbuf, sizeof (errbuf)));
+		fclose (fhin); /* this closes fd as well */
+		pthread_exit ((void *) 1);
+	}
+
+	while (fgets (buffer, sizeof (buffer), fhin) != NULL)
 	{
 		int len;
 
@@ -536,7 +588,7 @@ static void *us_handle_client (void *arg)
 		if (len == 0)
 			continue;
 
-		DBG ("fgets -> buffer = %s; len = %i;", buffer, len);
+		DEBUG ("fgets -> buffer = %s; len = %i;", buffer, len);
 
 		fields_num = strsplit (buffer, fields,
 				sizeof (fields) / sizeof (fields[0]));
@@ -549,17 +601,26 @@ static void *us_handle_client (void *arg)
 
 		if (strcasecmp (fields[0], "getval") == 0)
 		{
-			us_handle_getval (fh, fields, fields_num);
+			us_handle_getval (fhout, fields, fields_num);
+		}
+		else if (strcasecmp (fields[0], "putval") == 0)
+		{
+			handle_putval (fhout, fields, fields_num);
+		}
+		else if (strcasecmp (fields[0], "listval") == 0)
+		{
+			us_handle_listval (fhout, fields, fields_num);
 		}
 		else
 		{
-			fprintf (fh, "Unknown command: %s\n", fields[0]);
-			fflush (fh);
+			fprintf (fhout, "-1 Unknown command: %s\n", fields[0]);
+			fflush (fhout);
 		}
 	} /* while (fgets) */
 
-	DBG ("Exiting..");
-	close (fd);
+	DEBUG ("Exiting..");
+	fclose (fhin);
+	fclose (fhout);
 
 	pthread_exit ((void *) 0);
 } /* void *us_handle_client */
@@ -569,21 +630,24 @@ static void *us_server_thread (void *arg)
 	int  status;
 	int *remote_fd;
 	pthread_t th;
+	pthread_attr_t th_attr;
 
 	if (us_open_socket () != 0)
 		pthread_exit ((void *) 1);
 
-	while (42)
+	while (loop != 0)
 	{
-		DBG ("Calling accept..");
+		DEBUG ("unixsock plugin: Calling accept..");
 		status = accept (sock_fd, NULL, NULL);
 		if (status < 0)
 		{
+			char errbuf[1024];
+
 			if (errno == EINTR)
 				continue;
 
-			syslog (LOG_ERR, "unixsock plugin: accept failed: %s",
-					strerror (errno));
+			ERROR ("unixsock plugin: accept failed: %s",
+					sstrerror (errno, errbuf, sizeof (errbuf)));
 			close (sock_fd);
 			sock_fd = -1;
 			pthread_exit ((void *) 1);
@@ -592,25 +656,42 @@ static void *us_server_thread (void *arg)
 		remote_fd = (int *) malloc (sizeof (int));
 		if (remote_fd == NULL)
 		{
-			syslog (LOG_WARNING, "unixsock plugin: malloc failed: %s",
-					strerror (errno));
+			char errbuf[1024];
+			WARNING ("unixsock plugin: malloc failed: %s",
+					sstrerror (errno, errbuf, sizeof (errbuf)));
 			close (status);
 			continue;
 		}
 		*remote_fd = status;
 
-		DBG ("Spawning child to handle connection on fd #%i", *remote_fd);
+		DEBUG ("Spawning child to handle connection on fd #%i", *remote_fd);
+
+		pthread_attr_init (&th_attr);
+		pthread_attr_setdetachstate (&th_attr, PTHREAD_CREATE_DETACHED);
 
-		status = pthread_create (&th, NULL, us_handle_client, (void *) remote_fd);
+		status = pthread_create (&th, &th_attr, us_handle_client, (void *) remote_fd);
 		if (status != 0)
 		{
-			syslog (LOG_WARNING, "unixsock plugin: pthread_create failed: %s",
-					strerror (status));
+			char errbuf[1024];
+			WARNING ("unixsock plugin: pthread_create failed: %s",
+					sstrerror (errno, errbuf, sizeof (errbuf)));
 			close (*remote_fd);
 			free (remote_fd);
 			continue;
 		}
-	} /* while (42) */
+	} /* while (loop) */
+
+	close (sock_fd);
+	sock_fd = -1;
+
+	status = unlink ((sock_file != NULL) ? sock_file : US_DEFAULT_PATH);
+	if (status != 0)
+	{
+		char errbuf[1024];
+		NOTICE ("unixsock plugin: unlink (%s) failed: %s",
+				(sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
+				sstrerror (errno, errbuf, sizeof (errbuf)));
+	}
 
 	return ((void *) 0);
 } /* void *us_server_thread */
@@ -643,11 +724,14 @@ static int us_init (void)
 {
 	int status;
 
+	loop = 1;
+
 	status = pthread_create (&listen_thread, NULL, us_server_thread, NULL);
 	if (status != 0)
 	{
-		syslog (LOG_ERR, "unixsock plugin: pthread_create failed: %s",
-				strerror (status));
+		char errbuf[1024];
+		ERROR ("unixsock plugin: pthread_create failed: %s",
+				sstrerror (errno, errbuf, sizeof (errbuf)));
 		return (-1);
 	}
 
@@ -658,19 +742,26 @@ static int us_shutdown (void)
 {
 	void *ret;
 
-	if (listen_thread >= 0)
+	loop = 0;
+
+	if (listen_thread != (pthread_t) 0)
 	{
 		pthread_kill (listen_thread, SIGTERM);
 		pthread_join (listen_thread, &ret);
+		listen_thread = (pthread_t) 0;
 	}
 
+	plugin_unregister_init ("unixsock");
+	plugin_unregister_write ("unixsock");
+	plugin_unregister_shutdown ("unixsock");
+
 	return (0);
 } /* int us_shutdown */
 
 static int us_write (const data_set_t *ds, const value_list_t *vl)
 {
 	cache_update (ds, vl);
-	cache_flush (2 * atoi (COLLECTD_STEP));
+	cache_flush (2 * interval_g);
 
 	return (0);
 }