lighttpd/src/mod_rrdtool.c - axis-axis2-c-core - Git at Google

 #define _GNU_SOURCE
 #include <sys/types.h>

 #include <fcntl.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 #include <errno.h>
 #include <time.h>

 #include "server.h"
 #include "connections.h"
 #include "response.h"
 #include "connections.h"
 #include "log.h"

 #include "plugin.h"
 #ifdef HAVE_FORK
 /* no need for waitpid if we don't have fork */
 #include <sys/wait.h>
 #endif
 typedef struct {
 	buffer *path_rrdtool_bin;
 	buffer *path_rrd;

 	double requests, *requests_ptr;
 	double bytes_written, *bytes_written_ptr;
 	double bytes_read, *bytes_read_ptr;
 } plugin_config;

 typedef struct {
 	PLUGIN_DATA;

 	buffer *cmd;
 	buffer *resp;

 	int read_fd, write_fd;
 	pid_t rrdtool_pid;

 	int rrdtool_running;

 	plugin_config **config_storage;
 	plugin_config conf;
 } plugin_data;

 INIT_FUNC(mod_rrd_init) {
 	plugin_data *p;

 	p = calloc(1, sizeof(*p));

 	p->resp = buffer_init();
 	p->cmd = buffer_init();

 	return p;
 }

 FREE_FUNC(mod_rrd_free) {
 	plugin_data *p = p_d;
 	size_t i;

 	if (!p) return HANDLER_GO_ON;

 	if (p->config_storage) {
 		for (i = 0; i < srv->config_context->used; i++) {
 			plugin_config *s = p->config_storage[i];

 			buffer_free(s->path_rrdtool_bin);
 			buffer_free(s->path_rrd);

 			free(s);
 		}
 	}
 	buffer_free(p->cmd);
 	buffer_free(p->resp);

 	free(p->config_storage);

 	if (p->rrdtool_pid) {
 		int status;
 		close(p->read_fd);
 		close(p->write_fd);
 #ifdef HAVE_FORK
 		/* collect status */
 		waitpid(p->rrdtool_pid, &status, 0);
 #endif
 	}

 	free(p);

 	return HANDLER_GO_ON;
 }

 int mod_rrd_create_pipe(server *srv, plugin_data *p) {
 	pid_t pid;

 	int to_rrdtool_fds[2];
 	int from_rrdtool_fds[2];
 #ifdef HAVE_FORK
 	if (pipe(to_rrdtool_fds)) {
 		log_error_write(srv, __FILE__, __LINE__, "ss",
 				"pipe failed: ", strerror(errno));
 		return -1;
 	}

 	if (pipe(from_rrdtool_fds)) {
 		log_error_write(srv, __FILE__, __LINE__, "ss",
 				"pipe failed: ", strerror(errno));
 		return -1;
 	}

 	/* fork, execve */
 	switch (pid = fork()) {
 	case 0: {
 		/* child */
 		char **args;
 		int argc;
 		int i = 0;
 		char *dash = "-";

 		/* move stdout to from_rrdtool_fd[1] */
 		close(STDOUT_FILENO);
 		dup2(from_rrdtool_fds[1], STDOUT_FILENO);
 		close(from_rrdtool_fds[1]);
 		/* not needed */
 		close(from_rrdtool_fds[0]);

 		/* move the stdin to to_rrdtool_fd[0] */
 		close(STDIN_FILENO);
 		dup2(to_rrdtool_fds[0], STDIN_FILENO);
 		close(to_rrdtool_fds[0]);
 		/* not needed */
 		close(to_rrdtool_fds[1]);

 		close(STDERR_FILENO);

 		if (srv->errorlog_mode == ERRORLOG_FILE) {
 			dup2(srv->errorlog_fd, STDERR_FILENO);
 			close(srv->errorlog_fd);
 		}

 		/* set up args */
 		argc = 3;
 		args = malloc(sizeof(*args) * argc);
 		i = 0;

 		args[i++] = p->conf.path_rrdtool_bin->ptr;
 		args[i++] = dash;
 		args[i++] = NULL;

 		/* we don't need the client socket */
 		for (i = 3; i < 256; i++) {
 			close(i);
 		}

 		/* exec the cgi */
 		execv(args[0], args);

 		log_error_write(srv, __FILE__, __LINE__, "sss", "spawing rrdtool failed: ", strerror(errno), args[0]);

 		/* */
 		SEGFAULT();
 		break;
 	}
 	case -1:
 		/* error */
 		log_error_write(srv, __FILE__, __LINE__, "ss", "fork failed: ", strerror(errno));
 		break;
 	default: {
 		/* father */

 		close(from_rrdtool_fds[1]);
 		close(to_rrdtool_fds[0]);

 		/* register PID and wait for them asyncronously */
 		p->write_fd = to_rrdtool_fds[1];
 		p->read_fd = from_rrdtool_fds[0];
 		p->rrdtool_pid = pid;

 		break;
 	}
 	}

 	return 0;
 #else
 	return -1;
 #endif
 }

 static int mod_rrdtool_create_rrd(server *srv, plugin_data *p, plugin_config *s) {
 	struct stat st;

 	/* check if DB already exists */
 	if (0 == stat(s->path_rrd->ptr, &st)) {
 		/* check if it is plain file */
 		if (!S_ISREG(st.st_mode)) {
 			log_error_write(srv, __FILE__, __LINE__, "sb",
 					"not a regular file:", s->path_rrd);
 			return HANDLER_ERROR;
 		}
 	} else {
 		int r ;
 		/* create a new one */

 		BUFFER_COPY_STRING_CONST(p->cmd, "create ");
 		buffer_append_string_buffer(p->cmd, s->path_rrd);
 		buffer_append_string(p->cmd, " --step 60 ");
 		buffer_append_string(p->cmd, "DS:InOctets:ABSOLUTE:600:U:U ");
 		buffer_append_string(p->cmd, "DS:OutOctets:ABSOLUTE:600:U:U ");
 		buffer_append_string(p->cmd, "DS:Requests:ABSOLUTE:600:U:U ");
 		buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:1:600 ");
 		buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:6:700 ");
 		buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:24:775 ");
 		buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:288:797 ");
 		buffer_append_string(p->cmd, "RRA:MAX:0.5:1:600 ");
 		buffer_append_string(p->cmd, "RRA:MAX:0.5:6:700 ");
 		buffer_append_string(p->cmd, "RRA:MAX:0.5:24:775 ");
 		buffer_append_string(p->cmd, "RRA:MAX:0.5:288:797 ");
 		buffer_append_string(p->cmd, "RRA:MIN:0.5:1:600 ");
 		buffer_append_string(p->cmd, "RRA:MIN:0.5:6:700 ");
 		buffer_append_string(p->cmd, "RRA:MIN:0.5:24:775 ");
 		buffer_append_string(p->cmd, "RRA:MIN:0.5:288:797\n");

 		if (-1 == (r = write(p->write_fd, p->cmd->ptr, p->cmd->used - 1))) {
 			log_error_write(srv, __FILE__, __LINE__, "ss",
 				"rrdtool-write: failed", strerror(errno));

 			return HANDLER_ERROR;
 		}

 		buffer_prepare_copy(p->resp, 4096);
 		if (-1 == (r = read(p->read_fd, p->resp->ptr, p->resp->size))) {
 			log_error_write(srv, __FILE__, __LINE__, "ss",
 				"rrdtool-read: failed", strerror(errno));

 			return HANDLER_ERROR;
 		}

 		p->resp->used = r;

 		if (p->resp->ptr[0] != 'O' ||
 		    p->resp->ptr[1] != 'K') {
 			log_error_write(srv, __FILE__, __LINE__, "sbb",
 				"rrdtool-response:", p->cmd, p->resp);

 			return HANDLER_ERROR;
 		}
 	}

 	return HANDLER_GO_ON;
 }

 #define PATCH(x) \
 	p->conf.x = s->x;
 static int mod_rrd_patch_connection(server *srv, connection *con, plugin_data *p) {
 	size_t i, j;
 	plugin_config *s = p->config_storage[0];

 	PATCH(path_rrdtool_bin);
 	PATCH(path_rrd);

 	p->conf.bytes_written_ptr = &(s->bytes_written);
 	p->conf.bytes_read_ptr = &(s->bytes_read);
 	p->conf.requests_ptr = &(s->requests);

 	/* skip the first, the global context */
 	for (i = 1; i < srv->config_context->used; i++) {
 		data_config *dc = (data_config *)srv->config_context->data[i];
 		s = p->config_storage[i];

 		/* condition didn't match */
 		if (!config_check_cond(srv, con, dc)) continue;

 		/* merge config */
 		for (j = 0; j < dc->value->used; j++) {
 			data_unset *du = dc->value->data[j];

 			if (buffer_is_equal_string(du->key, CONST_STR_LEN("rrdtool.db-name"))) {
 				PATCH(path_rrd);
 				/* get pointers to double values */

 				p->conf.bytes_written_ptr = &(s->bytes_written);
 				p->conf.bytes_read_ptr = &(s->bytes_read);
 				p->conf.requests_ptr = &(s->requests);
 			}
 		}
 	}

 	return 0;
 }
 #undef PATCH

 SETDEFAULTS_FUNC(mod_rrd_set_defaults) {
 	plugin_data *p = p_d;
 	size_t i;

 	config_values_t cv[] = {
 		{ "rrdtool.binary",              NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_SERVER },
 		{ "rrdtool.db-name",             NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
 		{ NULL,                          NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
 	};

 	if (!p) return HANDLER_ERROR;

 	p->config_storage = calloc(1, srv->config_context->used * sizeof(specific_config *));

 	for (i = 0; i < srv->config_context->used; i++) {
 		plugin_config *s;

 		s = calloc(1, sizeof(plugin_config));
 		s->path_rrdtool_bin = buffer_init();
 		s->path_rrd = buffer_init();
 		s->requests = 0;
 		s->bytes_written = 0;
 		s->bytes_read = 0;

 		cv[0].destination = s->path_rrdtool_bin;
 		cv[1].destination = s->path_rrd;

 		p->config_storage[i] = s;

 		if (0 != config_insert_values_global(srv, ((data_config *)srv->config_context->data[i])->value, cv)) {
 			return HANDLER_ERROR;
 		}

 		if (i > 0 && !buffer_is_empty(s->path_rrdtool_bin)) {
 			/* path_rrdtool_bin is a global option */

 			log_error_write(srv, __FILE__, __LINE__, "s",
 					"rrdtool.binary can only be set as a global option.");

 			return HANDLER_ERROR;
 		}

 	}

 	p->conf.path_rrdtool_bin = p->config_storage[0]->path_rrdtool_bin;
 	p->rrdtool_running = 0;

 	/* check for dir */

 	if (buffer_is_empty(p->conf.path_rrdtool_bin)) {
 		log_error_write(srv, __FILE__, __LINE__, "s",
 				"rrdtool.binary has to be set");
 		return HANDLER_ERROR;
 	}

 	/* open the pipe to rrdtool */
 	if (mod_rrd_create_pipe(srv, p)) {
 		return HANDLER_ERROR;
 	}

 	p->rrdtool_running = 1;

 	return HANDLER_GO_ON;
 }

 TRIGGER_FUNC(mod_rrd_trigger) {
 	plugin_data *p = p_d;
 	size_t i;

 	if (!p->rrdtool_running) return HANDLER_GO_ON;
 	if ((srv->cur_ts % 60) != 0) return HANDLER_GO_ON;

 	for (i = 0; i < srv->config_context->used; i++) {
 		plugin_config *s = p->config_storage[i];
 		int r;

 		if (buffer_is_empty(s->path_rrd)) continue;

 		/* write the data down every minute */

 		if (HANDLER_GO_ON != mod_rrdtool_create_rrd(srv, p, s)) return HANDLER_ERROR;

 		BUFFER_COPY_STRING_CONST(p->cmd, "update ");
 		buffer_append_string_buffer(p->cmd, s->path_rrd);
 		BUFFER_APPEND_STRING_CONST(p->cmd, " N:");
 		buffer_append_off_t(p->cmd, s->bytes_read);
 		BUFFER_APPEND_STRING_CONST(p->cmd, ":");
 		buffer_append_off_t(p->cmd, s->bytes_written);
 		BUFFER_APPEND_STRING_CONST(p->cmd, ":");
 		buffer_append_long(p->cmd, s->requests);
 		BUFFER_APPEND_STRING_CONST(p->cmd, "\n");

 		if (-1 == (r = write(p->write_fd, p->cmd->ptr, p->cmd->used - 1))) {
 			p->rrdtool_running = 0;

 			log_error_write(srv, __FILE__, __LINE__, "ss",
 					"rrdtool-write: failed", strerror(errno));

 			return HANDLER_ERROR;
 		}

 		buffer_prepare_copy(p->resp, 4096);
 		if (-1 == (r = read(p->read_fd, p->resp->ptr, p->resp->size))) {
 			p->rrdtool_running = 0;

 			log_error_write(srv, __FILE__, __LINE__, "ss",
 					"rrdtool-read: failed", strerror(errno));

 			return HANDLER_ERROR;
 		}

 		p->resp->used = r;

 		if (p->resp->ptr[0] != 'O' ||
 		    p->resp->ptr[1] != 'K') {
 			p->rrdtool_running = 0;

 			log_error_write(srv, __FILE__, __LINE__, "sbb",
 					"rrdtool-response:", p->cmd, p->resp);

 			return HANDLER_ERROR;
 		}
 		s->requests = 0;
 		s->bytes_written = 0;
 		s->bytes_read = 0;
 	}

 	return HANDLER_GO_ON;
 }

 REQUESTDONE_FUNC(mod_rrd_account) {
 	plugin_data *p = p_d;

 	mod_rrd_patch_connection(srv, con, p);

 	*(p->conf.requests_ptr)      += 1;
 	*(p->conf.bytes_written_ptr) += con->bytes_written;
 	*(p->conf.bytes_read_ptr)    += con->bytes_read;

 	return HANDLER_GO_ON;
 }

 int mod_rrdtool_plugin_init(plugin *p) {
 	p->version     = LIGHTTPD_VERSION_ID;
 	p->name        = buffer_init_string("rrd");

 	p->init        = mod_rrd_init;
 	p->cleanup     = mod_rrd_free;
 	p->set_defaults= mod_rrd_set_defaults;

 	p->handle_trigger      = mod_rrd_trigger;
 	p->handle_request_done = mod_rrd_account;

 	p->data        = NULL;

 	return 0;
 }
	#define _GNU_SOURCE
	#include <sys/types.h>

	#include <fcntl.h>
	#include <stdlib.h>
	#include <stdio.h>
	#include <string.h>
	#include <unistd.h>
	#include <errno.h>
	#include <time.h>

	#include "server.h"
	#include "connections.h"
	#include "response.h"
	#include "connections.h"
	#include "log.h"

	#include "plugin.h"
	#ifdef HAVE_FORK
	/* no need for waitpid if we don't have fork */
	#include <sys/wait.h>
	#endif
	typedef struct {
	buffer *path_rrdtool_bin;
	buffer *path_rrd;

	double requests, *requests_ptr;
	double bytes_written, *bytes_written_ptr;
	double bytes_read, *bytes_read_ptr;
	} plugin_config;

	typedef struct {
	PLUGIN_DATA;

	buffer *cmd;
	buffer *resp;

	int read_fd, write_fd;
	pid_t rrdtool_pid;

	int rrdtool_running;

	plugin_config **config_storage;
	plugin_config conf;
	} plugin_data;

	INIT_FUNC(mod_rrd_init) {
	plugin_data *p;

	p = calloc(1, sizeof(*p));

	p->resp = buffer_init();
	p->cmd = buffer_init();

	return p;
	}

	FREE_FUNC(mod_rrd_free) {
	plugin_data *p = p_d;
	size_t i;

	if (!p) return HANDLER_GO_ON;

	if (p->config_storage) {
	for (i = 0; i < srv->config_context->used; i++) {
	plugin_config *s = p->config_storage[i];

	buffer_free(s->path_rrdtool_bin);
	buffer_free(s->path_rrd);

	free(s);
	}
	}
	buffer_free(p->cmd);
	buffer_free(p->resp);

	free(p->config_storage);

	if (p->rrdtool_pid) {
	int status;
	close(p->read_fd);
	close(p->write_fd);
	#ifdef HAVE_FORK
	/* collect status */
	waitpid(p->rrdtool_pid, &status, 0);
	#endif
	}

	free(p);

	return HANDLER_GO_ON;
	}

	int mod_rrd_create_pipe(server srv, plugin_data p) {
	pid_t pid;

	int to_rrdtool_fds[2];
	int from_rrdtool_fds[2];
	#ifdef HAVE_FORK
	if (pipe(to_rrdtool_fds)) {
	log_error_write(srv, __FILE__, __LINE__, "ss",
	"pipe failed: ", strerror(errno));
	return -1;
	}

	if (pipe(from_rrdtool_fds)) {
	log_error_write(srv, __FILE__, __LINE__, "ss",
	"pipe failed: ", strerror(errno));
	return -1;
	}

	/* fork, execve */
	switch (pid = fork()) {
	case 0: {
	/* child */
	char **args;
	int argc;
	int i = 0;
	char *dash = "-";

	/* move stdout to from_rrdtool_fd[1] */
	close(STDOUT_FILENO);
	dup2(from_rrdtool_fds[1], STDOUT_FILENO);
	close(from_rrdtool_fds[1]);
	/* not needed */
	close(from_rrdtool_fds[0]);

	/* move the stdin to to_rrdtool_fd[0] */
	close(STDIN_FILENO);
	dup2(to_rrdtool_fds[0], STDIN_FILENO);
	close(to_rrdtool_fds[0]);
	/* not needed */
	close(to_rrdtool_fds[1]);

	close(STDERR_FILENO);

	if (srv->errorlog_mode == ERRORLOG_FILE) {
	dup2(srv->errorlog_fd, STDERR_FILENO);
	close(srv->errorlog_fd);
	}

	/* set up args */
	argc = 3;
	args = malloc(sizeof(args) argc);
	i = 0;

	args[i++] = p->conf.path_rrdtool_bin->ptr;
	args[i++] = dash;
	args[i++] = NULL;

	/* we don't need the client socket */
	for (i = 3; i < 256; i++) {
	close(i);
	}

	/* exec the cgi */
	execv(args[0], args);

	log_error_write(srv, __FILE__, __LINE__, "sss", "spawing rrdtool failed: ", strerror(errno), args[0]);

	/* */
	SEGFAULT();
	break;
	}
	case -1:
	/* error */
	log_error_write(srv, __FILE__, __LINE__, "ss", "fork failed: ", strerror(errno));
	break;
	default: {
	/* father */

	close(from_rrdtool_fds[1]);
	close(to_rrdtool_fds[0]);

	/* register PID and wait for them asyncronously */
	p->write_fd = to_rrdtool_fds[1];
	p->read_fd = from_rrdtool_fds[0];
	p->rrdtool_pid = pid;

	break;
	}
	}

	return 0;
	#else
	return -1;
	#endif
	}

	static int mod_rrdtool_create_rrd(server srv, plugin_data p, plugin_config *s) {
	struct stat st;

	/* check if DB already exists */
	if (0 == stat(s->path_rrd->ptr, &st)) {
	/* check if it is plain file */
	if (!S_ISREG(st.st_mode)) {
	log_error_write(srv, __FILE__, __LINE__, "sb",
	"not a regular file:", s->path_rrd);
	return HANDLER_ERROR;
	}
	} else {
	int r ;
	/* create a new one */

	BUFFER_COPY_STRING_CONST(p->cmd, "create ");
	buffer_append_string_buffer(p->cmd, s->path_rrd);
	buffer_append_string(p->cmd, " --step 60 ");
	buffer_append_string(p->cmd, "DS:InOctets:ABSOLUTE:600:U:U ");
	buffer_append_string(p->cmd, "DS:OutOctets:ABSOLUTE:600:U:U ");
	buffer_append_string(p->cmd, "DS:Requests:ABSOLUTE:600:U:U ");
	buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:1:600 ");
	buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:6:700 ");
	buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:24:775 ");
	buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:288:797 ");
	buffer_append_string(p->cmd, "RRA:MAX:0.5:1:600 ");
	buffer_append_string(p->cmd, "RRA:MAX:0.5:6:700 ");
	buffer_append_string(p->cmd, "RRA:MAX:0.5:24:775 ");
	buffer_append_string(p->cmd, "RRA:MAX:0.5:288:797 ");
	buffer_append_string(p->cmd, "RRA:MIN:0.5:1:600 ");
	buffer_append_string(p->cmd, "RRA:MIN:0.5:6:700 ");
	buffer_append_string(p->cmd, "RRA:MIN:0.5:24:775 ");
	buffer_append_string(p->cmd, "RRA:MIN:0.5:288:797\n");

	if (-1 == (r = write(p->write_fd, p->cmd->ptr, p->cmd->used - 1))) {
	log_error_write(srv, __FILE__, __LINE__, "ss",
	"rrdtool-write: failed", strerror(errno));

	return HANDLER_ERROR;
	}

	buffer_prepare_copy(p->resp, 4096);
	if (-1 == (r = read(p->read_fd, p->resp->ptr, p->resp->size))) {
	log_error_write(srv, __FILE__, __LINE__, "ss",
	"rrdtool-read: failed", strerror(errno));

	return HANDLER_ERROR;
	}

	p->resp->used = r;

	if (p->resp->ptr[0] != 'O' \|\|
	p->resp->ptr[1] != 'K') {
	log_error_write(srv, __FILE__, __LINE__, "sbb",
	"rrdtool-response:", p->cmd, p->resp);

	return HANDLER_ERROR;
	}
	}

	return HANDLER_GO_ON;
	}

	#define PATCH(x) \
	p->conf.x = s->x;
	static int mod_rrd_patch_connection(server srv, connection con, plugin_data *p) {
	size_t i, j;
	plugin_config *s = p->config_storage[0];

	PATCH(path_rrdtool_bin);
	PATCH(path_rrd);

	p->conf.bytes_written_ptr = &(s->bytes_written);
	p->conf.bytes_read_ptr = &(s->bytes_read);
	p->conf.requests_ptr = &(s->requests);

	/* skip the first, the global context */
	for (i = 1; i < srv->config_context->used; i++) {
	data_config dc = (data_config )srv->config_context->data[i];
	s = p->config_storage[i];

	/* condition didn't match */
	if (!config_check_cond(srv, con, dc)) continue;

	/* merge config */
	for (j = 0; j < dc->value->used; j++) {
	data_unset *du = dc->value->data[j];

	if (buffer_is_equal_string(du->key, CONST_STR_LEN("rrdtool.db-name"))) {
	PATCH(path_rrd);
	/* get pointers to double values */

	p->conf.bytes_written_ptr = &(s->bytes_written);
	p->conf.bytes_read_ptr = &(s->bytes_read);
	p->conf.requests_ptr = &(s->requests);
	}
	}
	}

	return 0;
	}
	#undef PATCH

	SETDEFAULTS_FUNC(mod_rrd_set_defaults) {
	plugin_data *p = p_d;
	size_t i;

	config_values_t cv[] = {
	{ "rrdtool.binary", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_SERVER },
	{ "rrdtool.db-name", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
	{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
	};

	if (!p) return HANDLER_ERROR;

	p->config_storage = calloc(1, srv->config_context->used * sizeof(specific_config *));

	for (i = 0; i < srv->config_context->used; i++) {
	plugin_config *s;

	s = calloc(1, sizeof(plugin_config));
	s->path_rrdtool_bin = buffer_init();
	s->path_rrd = buffer_init();
	s->requests = 0;
	s->bytes_written = 0;
	s->bytes_read = 0;

	cv[0].destination = s->path_rrdtool_bin;
	cv[1].destination = s->path_rrd;

	p->config_storage[i] = s;

	if (0 != config_insert_values_global(srv, ((data_config *)srv->config_context->data[i])->value, cv)) {
	return HANDLER_ERROR;
	}

	if (i > 0 && !buffer_is_empty(s->path_rrdtool_bin)) {
	/* path_rrdtool_bin is a global option */

	log_error_write(srv, __FILE__, __LINE__, "s",
	"rrdtool.binary can only be set as a global option.");

	return HANDLER_ERROR;
	}

	}

	p->conf.path_rrdtool_bin = p->config_storage[0]->path_rrdtool_bin;
	p->rrdtool_running = 0;

	/* check for dir */

	if (buffer_is_empty(p->conf.path_rrdtool_bin)) {
	log_error_write(srv, __FILE__, __LINE__, "s",
	"rrdtool.binary has to be set");
	return HANDLER_ERROR;
	}

	/* open the pipe to rrdtool */
	if (mod_rrd_create_pipe(srv, p)) {
	return HANDLER_ERROR;
	}

	p->rrdtool_running = 1;

	return HANDLER_GO_ON;
	}

	TRIGGER_FUNC(mod_rrd_trigger) {
	plugin_data *p = p_d;
	size_t i;

	if (!p->rrdtool_running) return HANDLER_GO_ON;
	if ((srv->cur_ts % 60) != 0) return HANDLER_GO_ON;

	for (i = 0; i < srv->config_context->used; i++) {
	plugin_config *s = p->config_storage[i];
	int r;

	if (buffer_is_empty(s->path_rrd)) continue;

	/* write the data down every minute */

	if (HANDLER_GO_ON != mod_rrdtool_create_rrd(srv, p, s)) return HANDLER_ERROR;

	BUFFER_COPY_STRING_CONST(p->cmd, "update ");
	buffer_append_string_buffer(p->cmd, s->path_rrd);
	BUFFER_APPEND_STRING_CONST(p->cmd, " N:");
	buffer_append_off_t(p->cmd, s->bytes_read);
	BUFFER_APPEND_STRING_CONST(p->cmd, ":");
	buffer_append_off_t(p->cmd, s->bytes_written);
	BUFFER_APPEND_STRING_CONST(p->cmd, ":");
	buffer_append_long(p->cmd, s->requests);
	BUFFER_APPEND_STRING_CONST(p->cmd, "\n");

	if (-1 == (r = write(p->write_fd, p->cmd->ptr, p->cmd->used - 1))) {
	p->rrdtool_running = 0;

	log_error_write(srv, __FILE__, __LINE__, "ss",
	"rrdtool-write: failed", strerror(errno));

	return HANDLER_ERROR;
	}

	buffer_prepare_copy(p->resp, 4096);
	if (-1 == (r = read(p->read_fd, p->resp->ptr, p->resp->size))) {
	p->rrdtool_running = 0;

	log_error_write(srv, __FILE__, __LINE__, "ss",
	"rrdtool-read: failed", strerror(errno));

	return HANDLER_ERROR;
	}

	p->resp->used = r;

	if (p->resp->ptr[0] != 'O' \|\|
	p->resp->ptr[1] != 'K') {
	p->rrdtool_running = 0;

	log_error_write(srv, __FILE__, __LINE__, "sbb",
	"rrdtool-response:", p->cmd, p->resp);

	return HANDLER_ERROR;
	}
	s->requests = 0;
	s->bytes_written = 0;
	s->bytes_read = 0;
	}

	return HANDLER_GO_ON;
	}

	REQUESTDONE_FUNC(mod_rrd_account) {
	plugin_data *p = p_d;

	mod_rrd_patch_connection(srv, con, p);

	*(p->conf.requests_ptr) += 1;
	*(p->conf.bytes_written_ptr) += con->bytes_written;
	*(p->conf.bytes_read_ptr) += con->bytes_read;

	return HANDLER_GO_ON;
	}

	int mod_rrdtool_plugin_init(plugin *p) {
	p->version = LIGHTTPD_VERSION_ID;
	p->name = buffer_init_string("rrd");

	p->init = mod_rrd_init;
	p->cleanup = mod_rrd_free;
	p->set_defaults= mod_rrd_set_defaults;

	p->handle_trigger = mod_rrd_trigger;
	p->handle_request_done = mod_rrd_account;

	p->data = NULL;

	return 0;
	}