* Copyright (C) 2009 Doug MacEachern
* Copyright (C) 2009 Franck Lombardi
* Copyright (C) 2012 Nicolas Szalay
+ * Copyright (C) 2017 Pavel Rochnyak
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Doug MacEachern <dougm at hyperic.com>
* Franck Lombardi
* Nicolas Szalay
+ * Pavel Rochnyak <pavel2000 ngs.ru>
**/
#include "collectd.h"
-#include "common.h"
#include "plugin.h"
+#include "utils/common/common.h"
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/un.h>
+#include <poll.h>
+
#define MEMCACHED_DEF_HOST "127.0.0.1"
#define MEMCACHED_DEF_PORT "11211"
+#define MEMCACHED_CONNECT_TIMEOUT 10000
+#define MEMCACHED_IO_TIMEOUT 5000
+
+struct prev_s {
+ derive_t hits;
+ derive_t gets;
+ derive_t incr_hits;
+ derive_t incr_misses;
+ derive_t decr_hits;
+ derive_t decr_misses;
+};
+
+typedef struct prev_s prev_t;
struct memcached_s {
char *name;
char *socket;
char *connhost;
char *connport;
+ int fd;
+ prev_t prev;
};
typedef struct memcached_s memcached_t;
-static _Bool memcached_have_instances = 0;
+static bool memcached_have_instances;
static void memcached_free(void *arg) {
memcached_t *st = arg;
if (st == NULL)
return;
+ if (st->fd >= 0) {
+ shutdown(st->fd, SHUT_RDWR);
+ close(st->fd);
+ st->fd = -1;
+ }
+
sfree(st->name);
sfree(st->host);
sfree(st->socket);
static int memcached_connect_unix(memcached_t *st) {
struct sockaddr_un serv_addr = {0};
- int fd;
serv_addr.sun_family = AF_UNIX;
sstrncpy(serv_addr.sun_path, st->socket, sizeof(serv_addr.sun_path));
/* create our socket descriptor */
- fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ int fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0) {
- char errbuf[1024];
ERROR("memcached plugin: memcached_connect_unix: socket(2) failed: %s",
- sstrerror(errno, errbuf, sizeof(errbuf)));
- return (-1);
+ STRERRNO);
+ return -1;
}
/* connect to the memcached daemon */
if (status != 0) {
shutdown(fd, SHUT_RDWR);
close(fd);
- fd = -1;
+ return -1;
+ }
+
+ /* switch to non-blocking mode */
+ int flags = fcntl(fd, F_GETFL);
+ status = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
+ if (status != 0) {
+ close(fd);
+ return -1;
}
- return (fd);
+ return fd;
} /* int memcached_connect_unix */
static int memcached_connect_inet(memcached_t *st) {
struct addrinfo *ai_list;
- int status;
int fd = -1;
struct addrinfo ai_hints = {.ai_family = AF_UNSPEC,
.ai_flags = AI_ADDRCONFIG,
.ai_socktype = SOCK_STREAM};
- status = getaddrinfo(st->connhost, st->connport, &ai_hints, &ai_list);
+ int status = getaddrinfo(st->connhost, st->connport, &ai_hints, &ai_list);
if (status != 0) {
- char errbuf[1024];
ERROR("memcached plugin: memcached_connect_inet: "
"getaddrinfo(%s,%s) failed: %s",
st->connhost, st->connport,
- (status == EAI_SYSTEM) ? sstrerror(errno, errbuf, sizeof(errbuf))
- : gai_strerror(status));
- return (-1);
+ (status == EAI_SYSTEM) ? STRERRNO : gai_strerror(status));
+ return -1;
}
for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL;
/* create our socket descriptor */
fd = socket(ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
if (fd < 0) {
- char errbuf[1024];
WARNING("memcached plugin: memcached_connect_inet: "
"socket(2) failed: %s",
- sstrerror(errno, errbuf, sizeof(errbuf)));
+ STRERRNO);
+ continue;
+ }
+
+ /* switch socket to non-blocking mode */
+ int flags = fcntl(fd, F_GETFL);
+ status = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
+ if (status != 0) {
+ close(fd);
+ fd = -1;
continue;
}
/* connect to the memcached daemon */
status = (int)connect(fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
- if (status != 0) {
+ if (status != 0 && errno != EINPROGRESS) {
shutdown(fd, SHUT_RDWR);
close(fd);
fd = -1;
continue;
}
- /* A socket could be opened and connecting succeeded. We're done. */
+ /* Wait until connection establishes */
+ struct pollfd pollfd = {
+ .fd = fd,
+ .events = POLLOUT,
+ };
+ do
+ status = poll(&pollfd, 1, MEMCACHED_CONNECT_TIMEOUT);
+ while (status < 0 && errno == EINTR);
+ if (status <= 0) {
+ close(fd);
+ fd = -1;
+ continue;
+ }
+
+ /* Check if all is good */
+ int socket_error;
+ status = getsockopt(fd, SOL_SOCKET, SO_ERROR, (void *)&socket_error,
+ &(socklen_t){sizeof(socket_error)});
+ if (status != 0 || socket_error != 0) {
+ close(fd);
+ fd = -1;
+ continue;
+ }
+ /* A socket is opened and connection succeeded. We're done. */
break;
}
freeaddrinfo(ai_list);
- return (fd);
+ return fd;
} /* int memcached_connect_inet */
-static int memcached_connect(memcached_t *st) {
+static void memcached_connect(memcached_t *st) {
+ if (st->fd >= 0)
+ return;
+
if (st->socket != NULL)
- return (memcached_connect_unix(st));
+ st->fd = memcached_connect_unix(st);
else
- return (memcached_connect_inet(st));
+ st->fd = memcached_connect_inet(st);
+
+ if (st->fd >= 0)
+ INFO("memcached plugin: Instance \"%s\": connection established.",
+ st->name);
}
static int memcached_query_daemon(char *buffer, size_t buffer_size,
memcached_t *st) {
- int fd, status;
+ int status;
size_t buffer_fill;
- fd = memcached_connect(st);
- if (fd < 0) {
+ memcached_connect(st);
+ if (st->fd < 0) {
ERROR("memcached plugin: Instance \"%s\" could not connect to daemon.",
st->name);
return -1;
}
- status = (int)swrite(fd, "stats\r\n", strlen("stats\r\n"));
+ struct pollfd pollfd = {
+ .fd = st->fd,
+ .events = POLLOUT,
+ };
+
+ do
+ status = poll(&pollfd, 1, MEMCACHED_IO_TIMEOUT);
+ while (status < 0 && errno == EINTR);
+
+ if (status <= 0) {
+ ERROR("memcached plugin: poll() failed for write() call.");
+ close(st->fd);
+ st->fd = -1;
+ return -1;
+ }
+
+ status = (int)swrite(st->fd, "stats\r\n", strlen("stats\r\n"));
if (status != 0) {
- char errbuf[1024];
- ERROR("memcached plugin: write(2) failed: %s",
- sstrerror(errno, errbuf, sizeof(errbuf)));
- shutdown(fd, SHUT_RDWR);
- close(fd);
- return (-1);
+ ERROR("memcached plugin: Instance \"%s\": write(2) failed: %s", st->name,
+ STRERRNO);
+ shutdown(st->fd, SHUT_RDWR);
+ close(st->fd);
+ st->fd = -1;
+ return -1;
}
/* receive data from the memcached daemon */
memset(buffer, 0, buffer_size);
buffer_fill = 0;
- while ((status = (int)recv(fd, buffer + buffer_fill,
- buffer_size - buffer_fill, /* flags = */ 0)) !=
- 0) {
+ pollfd.events = POLLIN;
+ while (1) {
+ do
+ status = poll(&pollfd, 1, MEMCACHED_IO_TIMEOUT);
+ while (status < 0 && errno == EINTR);
+
+ if (status <= 0) {
+ ERROR("memcached plugin: Instance \"%s\": Timeout reading from socket",
+ st->name);
+ close(st->fd);
+ st->fd = -1;
+ return -1;
+ }
+
+ do
+ status = (int)recv(st->fd, buffer + buffer_fill,
+ buffer_size - buffer_fill, /* flags = */ 0);
+ while (status < 0 && errno == EINTR);
+
char const end_token[5] = {'E', 'N', 'D', '\r', '\n'};
if (status < 0) {
- char errbuf[1024];
- if ((errno == EAGAIN) || (errno == EINTR))
+ if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
continue;
- ERROR("memcached: Error reading from socket: %s",
- sstrerror(errno, errbuf, sizeof(errbuf)));
- shutdown(fd, SHUT_RDWR);
- close(fd);
- return (-1);
+ ERROR("memcached plugin: Instance \"%s\": Error reading from socket: %s",
+ st->name, STRERRNO);
+ shutdown(st->fd, SHUT_RDWR);
+ close(st->fd);
+ st->fd = -1;
+ return -1;
+ } else if (status == 0) {
+ ERROR("memcached plugin: Instance \"%s\": Connection closed by peer",
+ st->name);
+ close(st->fd);
+ st->fd = -1;
+ return -1;
}
buffer_fill += (size_t)status;
if (buffer_fill > buffer_size) {
buffer_fill = buffer_size;
- WARNING("memcached plugin: Message was truncated.");
+ WARNING("memcached plugin: Instance \"%s\": Message was truncated.",
+ st->name);
+ shutdown(st->fd, SHUT_RDWR);
+ close(st->fd);
+ st->fd = -1;
break;
}
status = 0;
if (buffer_fill == 0) {
- WARNING("memcached plugin: No data returned by memcached.");
+ WARNING("memcached plugin: Instance \"%s\": No data returned by memcached.",
+ st->name);
status = -1;
}
- shutdown(fd, SHUT_RDWR);
- close(fd);
- return (status);
+ return status;
} /* int memcached_query_daemon */
static void memcached_init_vl(value_list_t *vl, memcached_t const *st) {
derive_t value0, derive_t value1, memcached_t *st) {
value_list_t vl = VALUE_LIST_INIT;
value_t values[] = {
- {.derive = value0}, {.derive = value1},
+ {.derive = value0},
+ {.derive = value1},
};
memcached_init_vl(&vl, st);
gauge_t value0, gauge_t value1, memcached_t *st) {
value_list_t vl = VALUE_LIST_INIT;
value_t values[] = {
- {.gauge = value0}, {.gauge = value1},
+ {.gauge = value0},
+ {.gauge = value1},
};
memcached_init_vl(&vl, st);
plugin_dispatch_values(&vl);
}
+static gauge_t calculate_ratio_percent(derive_t part, derive_t total,
+ derive_t *prev_part,
+ derive_t *prev_total) {
+ if ((*prev_part == 0) || (*prev_total == 0) || (part < *prev_part) ||
+ (total < *prev_total)) {
+ *prev_part = part;
+ *prev_total = total;
+ return NAN;
+ }
+
+ derive_t num = part - *prev_part;
+ derive_t denom = total - *prev_total;
+
+ *prev_part = part;
+ *prev_total = total;
+
+ if (denom == 0)
+ return NAN;
+
+ if (num == 0)
+ return 0;
+
+ return 100.0 * (gauge_t)num / (gauge_t)denom;
+}
+
+static gauge_t calculate_ratio_percent2(derive_t part1, derive_t part2,
+ derive_t *prev1, derive_t *prev2) {
+ if ((*prev1 == 0) || (*prev2 == 0) || (part1 < *prev1) || (part2 < *prev2)) {
+ *prev1 = part1;
+ *prev2 = part2;
+ return NAN;
+ }
+
+ derive_t num = part1 - *prev1;
+ derive_t denom = part2 - *prev2 + num;
+
+ *prev1 = part1;
+ *prev2 = part2;
+
+ if (denom == 0)
+ return NAN;
+
+ if (num == 0)
+ return 0;
+
+ return 100.0 * (gauge_t)num / (gauge_t)denom;
+}
+
static int memcached_read(user_data_t *user_data) {
char buf[4096];
char *fields[3];
- char *ptr;
char *line;
- char *saveptr;
- int fields_num;
-
- gauge_t bytes_used = NAN;
- gauge_t bytes_total = NAN;
- gauge_t hits = NAN;
- gauge_t gets = NAN;
- gauge_t incr_hits = NAN;
- derive_t incr = 0;
- gauge_t decr_hits = NAN;
- derive_t decr = 0;
+
+ derive_t bytes_used = 0;
+ derive_t bytes_total = 0;
+ derive_t get_hits = 0;
+ derive_t cmd_get = 0;
+ derive_t incr_hits = 0;
+ derive_t incr_misses = 0;
+ derive_t decr_hits = 0;
+ derive_t decr_misses = 0;
derive_t rusage_user = 0;
derive_t rusage_syst = 0;
derive_t octets_rx = 0;
derive_t octets_tx = 0;
- memcached_t *st;
- st = user_data->data;
+ memcached_t *st = user_data->data;
+ prev_t *prev = &st->prev;
/* get data from daemon */
if (memcached_query_daemon(buf, sizeof(buf), st) < 0) {
#define FIELD_IS(cnst) \
(((sizeof(cnst) - 1) == name_len) && (strcmp(cnst, fields[1]) == 0))
- ptr = buf;
- saveptr = NULL;
+ char *ptr = buf;
+ char *saveptr = NULL;
while ((line = strtok_r(ptr, "\n\r", &saveptr)) != NULL) {
- int name_len;
-
ptr = NULL;
- fields_num = strsplit(line, fields, 3);
- if (fields_num != 3)
+ if (strsplit(line, fields, 3) != 3)
continue;
- name_len = strlen(fields[1]);
+ size_t name_len = strlen(fields[1]);
if (name_len == 0)
continue;
* Number of bytes used and available (total - used)
*/
else if (FIELD_IS("bytes")) {
- bytes_used = atof(fields[2]);
+ bytes_used = atoll(fields[2]);
} else if (FIELD_IS("limit_maxbytes")) {
- bytes_total = atof(fields[2]);
+ bytes_total = atoll(fields[2]);
}
/*
else if (FIELD_IS("curr_connections")) {
submit_gauge("memcached_connections", "current", atof(fields[2]), st);
} else if (FIELD_IS("listen_disabled_num")) {
- submit_derive("connections", "listen_disabled", atof(fields[2]), st);
+ submit_derive("total_events", "listen_disabled", atoll(fields[2]), st);
+ }
+ /*
+ * Total number of connections opened since the server started running
+ * Report this as connection rate.
+ */
+ else if (FIELD_IS("total_connections")) {
+ submit_derive("connections", "opened", atoll(fields[2]), st);
}
/*
const char *name = fields[1] + 4;
submit_derive("memcached_command", name, atoll(fields[2]), st);
if (strcmp(name, "get") == 0)
- gets = atof(fields[2]);
+ cmd_get = atoll(fields[2]);
}
/*
* Increment/Decrement
*/
else if (FIELD_IS("incr_misses")) {
- derive_t incr_count = atoll(fields[2]);
- submit_derive("memcached_ops", "incr_misses", incr_count, st);
- incr += incr_count;
+ incr_misses = atoll(fields[2]);
+ submit_derive("memcached_ops", "incr_misses", incr_misses, st);
} else if (FIELD_IS("incr_hits")) {
- derive_t incr_count = atoll(fields[2]);
- submit_derive("memcached_ops", "incr_hits", incr_count, st);
- incr_hits = atof(fields[2]);
- incr += incr_count;
+ incr_hits = atoll(fields[2]);
+ submit_derive("memcached_ops", "incr_hits", incr_hits, st);
} else if (FIELD_IS("decr_misses")) {
- derive_t decr_count = atoll(fields[2]);
- submit_derive("memcached_ops", "decr_misses", decr_count, st);
- decr += decr_count;
+ decr_misses = atoll(fields[2]);
+ submit_derive("memcached_ops", "decr_misses", decr_misses, st);
} else if (FIELD_IS("decr_hits")) {
- derive_t decr_count = atoll(fields[2]);
- submit_derive("memcached_ops", "decr_hits", decr_count, st);
- decr_hits = atof(fields[2]);
- decr += decr_count;
+ decr_hits = atoll(fields[2]);
+ submit_derive("memcached_ops", "decr_hits", decr_hits, st);
}
/*
- * Operations on the cache, i. e. cache hits, cache misses and evictions of
- * items
+ * Operations on the cache:
+ * - get hits/misses
+ * - delete hits/misses
+ * - evictions
*/
else if (FIELD_IS("get_hits")) {
- submit_derive("memcached_ops", "hits", atoll(fields[2]), st);
- hits = atof(fields[2]);
+ get_hits = atoll(fields[2]);
+ submit_derive("memcached_ops", "hits", get_hits, st);
} else if (FIELD_IS("get_misses")) {
submit_derive("memcached_ops", "misses", atoll(fields[2]), st);
} else if (FIELD_IS("evictions")) {
submit_derive("memcached_ops", "evictions", atoll(fields[2]), st);
+ } else if (FIELD_IS("delete_hits")) {
+ submit_derive("memcached_ops", "delete_hits", atoll(fields[2]), st);
+ } else if (FIELD_IS("delete_misses")) {
+ submit_derive("memcached_ops", "delete_misses", atoll(fields[2]), st);
}
/*
}
} /* while ((line = strtok_r (ptr, "\n\r", &saveptr)) != NULL) */
- if (!isnan(bytes_used) && !isnan(bytes_total) && (bytes_used <= bytes_total))
+ if ((bytes_total > 0) && (bytes_used <= bytes_total))
submit_gauge2("df", "cache", bytes_used, bytes_total - bytes_used, st);
if ((rusage_user != 0) || (rusage_syst != 0))
if ((octets_rx != 0) || (octets_tx != 0))
submit_derive2("memcached_octets", NULL, octets_rx, octets_tx, st);
- if (!isnan(gets) && !isnan(hits)) {
- gauge_t rate = NAN;
-
- if (gets != 0.0)
- rate = 100.0 * hits / gets;
-
- submit_gauge("percent", "hitratio", rate, st);
+ if ((cmd_get != 0) && (get_hits != 0)) {
+ gauge_t ratio =
+ calculate_ratio_percent(get_hits, cmd_get, &prev->hits, &prev->gets);
+ submit_gauge("percent", "hitratio", ratio, st);
}
- if (!isnan(incr_hits) && incr != 0) {
- gauge_t incr_rate = 100.0 * incr_hits / incr;
- submit_gauge("percent", "incr_hitratio", incr_rate, st);
- submit_derive("memcached_ops", "incr", incr, st);
+ if ((incr_hits != 0) && (incr_misses != 0)) {
+ gauge_t ratio = calculate_ratio_percent2(
+ incr_hits, incr_misses, &prev->incr_hits, &prev->incr_misses);
+ submit_gauge("percent", "incr_hitratio", ratio, st);
+ submit_derive("memcached_ops", "incr", incr_hits + incr_misses, st);
}
- if (!isnan(decr_hits) && decr != 0) {
- gauge_t decr_rate = 100.0 * decr_hits / decr;
- submit_gauge("percent", "decr_hitratio", decr_rate, st);
- submit_derive("memcached_ops", "decr", decr, st);
+ if ((decr_hits != 0) && (decr_misses != 0)) {
+ gauge_t ratio = calculate_ratio_percent2(
+ decr_hits, decr_misses, &prev->decr_hits, &prev->decr_misses);
+ submit_gauge("percent", "decr_hitratio", ratio, st);
+ submit_derive("memcached_ops", "decr", decr_hits + decr_misses, st);
}
return 0;
} /* int memcached_read */
-static int memcached_add_read_callback(memcached_t *st) {
- char callback_name[3 * DATA_MAX_NAME_LEN];
- int status;
-
- ssnprintf(callback_name, sizeof(callback_name), "memcached/%s",
- (st->name != NULL) ? st->name : "__legacy__");
-
+static int memcached_set_defaults(memcached_t *st) {
/* If no <Address> used then:
* - Connect to the destination specified by <Host>, if present.
* If not, use the default address.
if (st->host) {
st->connhost = strdup(st->host);
if (st->connhost == NULL)
- return (ENOMEM);
+ return ENOMEM;
if ((strcmp("127.0.0.1", st->host) == 0) ||
(strcmp("localhost", st->host) == 0))
} else {
st->connhost = strdup(MEMCACHED_DEF_HOST);
if (st->connhost == NULL)
- return (ENOMEM);
+ return ENOMEM;
}
}
if (st->connport == NULL) {
st->connport = strdup(MEMCACHED_DEF_PORT);
if (st->connport == NULL)
- return (ENOMEM);
+ return ENOMEM;
}
assert(st->connhost != NULL);
assert(st->connport != NULL);
- status = plugin_register_complex_read(
+ st->prev.hits = 0;
+ st->prev.gets = 0;
+ st->prev.incr_hits = 0;
+ st->prev.incr_misses = 0;
+ st->prev.decr_hits = 0;
+ st->prev.decr_misses = 0;
+
+ return 0;
+} /* int memcached_set_defaults */
+
+static int memcached_add_read_callback(memcached_t *st) {
+ char callback_name[3 * DATA_MAX_NAME_LEN];
+
+ if (memcached_set_defaults(st) != 0) {
+ memcached_free(st);
+ return -1;
+ }
+
+ snprintf(callback_name, sizeof(callback_name), "memcached/%s",
+ (st->name != NULL) ? st->name : "__legacy__");
+
+ return plugin_register_complex_read(
/* group = */ "memcached",
/* name = */ callback_name,
/* callback = */ memcached_read,
- /* interval = */ 0, &(user_data_t){
- .data = st, .free_func = memcached_free,
- });
-
- return (status);
+ /* interval = */ 0,
+ &(user_data_t){
+ .data = st,
+ .free_func = memcached_free,
+ });
} /* int memcached_add_read_callback */
/* Configuration handling functiions
* </Plugin>
*/
static int config_add_instance(oconfig_item_t *ci) {
- memcached_t *st;
int status = 0;
/* Disable automatic generation of default instance in the init callback. */
- memcached_have_instances = 1;
+ memcached_have_instances = true;
- st = calloc(1, sizeof(*st));
+ memcached_t *st = calloc(1, sizeof(*st));
if (st == NULL) {
ERROR("memcached plugin: calloc failed.");
- return (ENOMEM);
+ return ENOMEM;
}
st->name = NULL;
st->connhost = NULL;
st->connport = NULL;
+ st->fd = -1;
+
if (strcasecmp(ci->key, "Instance") == 0)
status = cf_util_get_string(ci, &st->name);
if (status != 0) {
sfree(st);
- return (status);
+ return status;
}
for (int i = 0; i < ci->children_num; i++) {
break;
}
- if (status == 0)
- status = memcached_add_read_callback(st);
-
if (status != 0) {
memcached_free(st);
- return (-1);
+ return -1;
}
- return (0);
-}
+ return memcached_add_read_callback(st);
+} /* int config_add_instance */
static int memcached_config(oconfig_item_t *ci) {
- int status = 0;
- _Bool have_instance_block = 0;
+ bool have_instance_block = 0;
for (int i = 0; i < ci->children_num; i++) {
oconfig_item_t *child = ci->children + i;
} else if (!have_instance_block) {
/* Non-instance option: Assume legacy configuration (without <Instance />
* blocks) and call config_add_instance() with the <Plugin /> block. */
- return (config_add_instance(ci));
+ return config_add_instance(ci);
} else
WARNING("memcached plugin: The configuration option "
"\"%s\" is not allowed here. Did you "
child->key);
} /* for (ci->children) */
- return (status);
-}
+ return 0;
+} /* int memcached_config */
static int memcached_init(void) {
- memcached_t *st;
- int status;
if (memcached_have_instances)
- return (0);
+ return 0;
/* No instances were configured, lets start a default instance. */
- st = calloc(1, sizeof(*st));
+ memcached_t *st = calloc(1, sizeof(*st));
if (st == NULL)
- return (ENOMEM);
+ return ENOMEM;
st->name = NULL;
st->host = NULL;
st->socket = NULL;
st->connhost = NULL;
st->connport = NULL;
- status = memcached_add_read_callback(st);
+ st->fd = -1;
+
+ int status = memcached_add_read_callback(st);
if (status == 0)
- memcached_have_instances = 1;
- else
- memcached_free(st);
+ memcached_have_instances = true;
- return (status);
+ return status;
} /* int memcached_init */
void module_register(void) {
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