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42b12b34fa
nginx/src/event/ngx_event.c
Igor Sysoev 42b12b34fa nginx-0.1.11-RELEASE import 
*) Feature: the worker_priority directive.

    *) Change: both tcp_nopush and tcp_nodelay directives affect the
       transferred response.

    *) Bugfix: nginx did not call initgroups().
       Thanks to Andrew Sitnikov and Andrei Nigmatulin.

    *) Change: now the ngx_http_autoindex_module shows the file size in the
       bytes.

    *) Bugfix: the ngx_http_autoindex_module returned the 500 error if the
       broken symlink was in a directory.

    *) Bugfix: the files bigger than 4G could not be transferred using
       sendfile.

    *) Bugfix: if the backend was resolved to several backends and there
       was an error while the response waiting then process may got caught
       in an endless loop.

    *) Bugfix: the worker process may exit with the "unknown cycle" message
       when the /dev/poll method was used.

    *) Bugfix: "close() channel failed" errors.

    *) Bugfix: the autodetection of the "nobody" and "nogroup" groups.

    *) Bugfix: the send_lowat directive did not work on Linux.

    *) Bugfix: the segmentation fault occurred if there was no events
       section in configuration.

    *) Bugfix: nginx could not be built on OpenBSD.

    *) Bugfix: the double slashes in "://" in the URI were converted to
       ":/".
2004-12-02 18:40:46 +00:00

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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#define DEFAULT_CONNECTIONS 512
extern ngx_module_t ngx_kqueue_module;
extern ngx_module_t ngx_devpoll_module;
extern ngx_module_t ngx_epoll_module;
extern ngx_module_t ngx_rtsig_module;
extern ngx_module_t ngx_select_module;
static ngx_int_t ngx_event_module_init(ngx_cycle_t *cycle);
static ngx_int_t ngx_event_process_init(ngx_cycle_t *cycle);
static char *ngx_events_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static char *ngx_event_connections(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_event_use(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static char *ngx_event_debug_connection(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static void *ngx_event_create_conf(ngx_cycle_t *cycle);
static char *ngx_event_init_conf(ngx_cycle_t *cycle, void *conf);
static char *ngx_accept_mutex_check(ngx_conf_t *cf, void *post, void *data);
static ngx_uint_t ngx_event_max_module;
ngx_uint_t ngx_event_flags;
ngx_event_actions_t ngx_event_actions;
ngx_atomic_t connection_counter;
ngx_atomic_t *ngx_connection_counter = &connection_counter;
ngx_atomic_t *ngx_accept_mutex_ptr;
ngx_atomic_t *ngx_accept_mutex;
ngx_uint_t ngx_accept_mutex_held;
ngx_msec_t ngx_accept_mutex_delay;
ngx_int_t ngx_accept_disabled;
#if (NGX_STAT_STUB)
ngx_atomic_t ngx_stat_accepted0;
ngx_atomic_t *ngx_stat_accepted = &ngx_stat_accepted0;
ngx_atomic_t ngx_stat_requests0;
ngx_atomic_t *ngx_stat_requests = &ngx_stat_requests0;
ngx_atomic_t ngx_stat_active0;
ngx_atomic_t *ngx_stat_active = &ngx_stat_active0;
ngx_atomic_t ngx_stat_reading0;
ngx_atomic_t *ngx_stat_reading = &ngx_stat_reading0;
ngx_atomic_t ngx_stat_writing0;
ngx_atomic_t *ngx_stat_writing = &ngx_stat_reading0;
#endif
static ngx_command_t ngx_events_commands[] = {
{ ngx_string("events"),
NGX_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_NOARGS,
ngx_events_block,
0,
0,
NULL },
ngx_null_command
};
static ngx_core_module_t ngx_events_module_ctx = {
ngx_string("events"),
NULL,
NULL
};
ngx_module_t ngx_events_module = {
NGX_MODULE,
&ngx_events_module_ctx, /* module context */
ngx_events_commands, /* module directives */
NGX_CORE_MODULE, /* module type */
NULL, /* init module */
NULL /* init process */
};
static ngx_str_t event_core_name = ngx_string("event_core");
static ngx_conf_post_t ngx_accept_mutex_post = { ngx_accept_mutex_check } ;
static ngx_command_t ngx_event_core_commands[] = {
{ ngx_string("connections"),
NGX_EVENT_CONF|NGX_CONF_TAKE1,
ngx_event_connections,
0,
0,
NULL },
{ ngx_string("use"),
NGX_EVENT_CONF|NGX_CONF_TAKE1,
ngx_event_use,
0,
0,
NULL },
{ ngx_string("multi_accept"),
NGX_EVENT_CONF|NGX_CONF_TAKE1,
ngx_conf_set_flag_slot,
0,
offsetof(ngx_event_conf_t, multi_accept),
NULL },
{ ngx_string("accept_mutex"),
NGX_EVENT_CONF|NGX_CONF_TAKE1,
ngx_conf_set_flag_slot,
0,
offsetof(ngx_event_conf_t, accept_mutex),
&ngx_accept_mutex_post },
{ ngx_string("accept_mutex_delay"),
NGX_EVENT_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
0,
offsetof(ngx_event_conf_t, accept_mutex_delay),
NULL },
{ ngx_string("debug_connection"),
NGX_EVENT_CONF|NGX_CONF_TAKE1,
ngx_event_debug_connection,
0,
0,
NULL },
ngx_null_command
};
ngx_event_module_t ngx_event_core_module_ctx = {
&event_core_name,
ngx_event_create_conf, /* create configuration */
ngx_event_init_conf, /* init configuration */
{ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
};
ngx_module_t ngx_event_core_module = {
NGX_MODULE,
&ngx_event_core_module_ctx, /* module context */
ngx_event_core_commands, /* module directives */
NGX_EVENT_MODULE, /* module type */
ngx_event_module_init, /* init module */
ngx_event_process_init /* init process */
};
static ngx_int_t ngx_event_module_init(ngx_cycle_t *cycle)
{
#if !(NGX_WIN32)
size_t size;
void ***cf;
char *shared;
ngx_core_conf_t *ccf;
ngx_event_conf_t *ecf;
cf = ngx_get_conf(cycle->conf_ctx, ngx_events_module);
if (cf == NULL) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
"no \"events\" section in configuration");
return NGX_ERROR;
}
ecf = (*cf)[ngx_event_core_module.ctx_index];
ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
"using the \"%s\" event method", ecf->name);
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
if (ccf->master == 0 || ngx_accept_mutex_ptr) {
return NGX_OK;
}
/* TODO: 128 is cache line size */
size = 128 /* ngx_accept_mutex */
+ 128; /* ngx_connection_counter */
#if (NGX_STAT_STUB)
size += 128 /* ngx_stat_accepted */
+ 128 /* ngx_stat_requests */
+ 128 /* ngx_stat_active */
+ 128 /* ngx_stat_reading */
+ 128; /* ngx_stat_writing */
#endif
if (!(shared = ngx_create_shared_memory(size, cycle->log))) {
return NGX_ERROR;
}
ngx_accept_mutex_ptr = (ngx_atomic_t *) shared;
ngx_connection_counter = (ngx_atomic_t *) (shared + 128);
#if (NGX_STAT_STUB)
ngx_stat_accepted = (ngx_atomic_t *) (shared + 2 * 128);
ngx_stat_requests = (ngx_atomic_t *) (shared + 3 * 128);
ngx_stat_active = (ngx_atomic_t *) (shared + 4 * 128);
ngx_stat_reading = (ngx_atomic_t *) (shared + 5 * 128);
ngx_stat_writing = (ngx_atomic_t *) (shared + 6 * 128);
#endif
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"counter: %p, %d",
ngx_connection_counter, *ngx_connection_counter);
#endif
return NGX_OK;
}
static ngx_int_t ngx_event_process_init(ngx_cycle_t *cycle)
{
ngx_uint_t m, i;
ngx_socket_t fd;
ngx_event_t *rev, *wev;
ngx_listening_t *s;
ngx_connection_t *c;
ngx_core_conf_t *ccf;
ngx_event_conf_t *ecf;
ngx_event_module_t *module;
#if (NGX_WIN32)
ngx_iocp_conf_t *iocpcf;
#endif
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
if (ngx_accept_mutex_ptr && ccf->worker_processes > 1 && ecf->accept_mutex)
{
ngx_accept_mutex = ngx_accept_mutex_ptr;
ngx_accept_mutex_held = 0;
ngx_accept_mutex_delay = ecf->accept_mutex_delay;
}
#if (NGX_THREADS)
if (!(ngx_posted_events_mutex = ngx_mutex_init(cycle->log, 0))) {
return NGX_ERROR;
}
#endif
if (ngx_event_timer_init(cycle->log) == NGX_ERROR) {
return NGX_ERROR;
}
cycle->connection_n = ecf->connections;
for (m = 0; ngx_modules[m]; m++) {
if (ngx_modules[m]->type != NGX_EVENT_MODULE) {
continue;
}
if (ngx_modules[m]->ctx_index == ecf->use) {
module = ngx_modules[m]->ctx;
if (module->actions.init(cycle) == NGX_ERROR) {
/* fatal */
exit(2);
}
break;
}
}
cycle->connections = ngx_alloc(sizeof(ngx_connection_t) * ecf->connections,
cycle->log);
if (cycle->connections == NULL) {
return NGX_ERROR;
}
c = cycle->connections;
for (i = 0; i < cycle->connection_n; i++) {
c[i].fd = (ngx_socket_t) -1;
c[i].data = NULL;
#if (NGX_THREADS)
c[i].lock = 0;
#endif
}
cycle->read_events = ngx_alloc(sizeof(ngx_event_t) * ecf->connections,
cycle->log);
if (cycle->read_events == NULL) {
return NGX_ERROR;
}
rev = cycle->read_events;
for (i = 0; i < cycle->connection_n; i++) {
rev[i].closed = 1;
#if (NGX_THREADS)
rev[i].lock = &c[i].lock;
rev[i].own_lock = &c[i].lock;
#endif
}
cycle->write_events = ngx_alloc(sizeof(ngx_event_t) * ecf->connections,
cycle->log);
if (cycle->write_events == NULL) {
return NGX_ERROR;
}
wev = cycle->write_events;
for (i = 0; i < cycle->connection_n; i++) {
wev[i].closed = 1;
#if (NGX_THREADS)
wev[i].lock = &c[i].lock;
wev[i].own_lock = &c[i].lock;
#endif
}
/* for each listening socket */
s = cycle->listening.elts;
for (i = 0; i < cycle->listening.nelts; i++) {
fd = s[i].fd;
#if (NGX_WIN32)
/*
* Winsock assignes a socket number divisible by 4
* so to find a connection we divide a socket number by 4.
*/
fd /= 4;
#endif
c = &cycle->connections[fd];
rev = &cycle->read_events[fd];
wev = &cycle->write_events[fd];
ngx_memzero(c, sizeof(ngx_connection_t));
ngx_memzero(rev, sizeof(ngx_event_t));
c->fd = s[i].fd;
c->listening = &s[i];
c->ctx = s[i].ctx;
c->servers = s[i].servers;
c->log = s[i].log;
c->read = rev;
/* required by iocp in "c->write->active = 1" */
c->write = wev;
/* required by poll */
wev->index = NGX_INVALID_INDEX;
rev->log = c->log;
rev->data = c;
rev->index = NGX_INVALID_INDEX;
rev->available = 0;
rev->accept = 1;
#if (NGX_HAVE_DEFERRED_ACCEPT)
rev->deferred_accept = s[i].deferred_accept;
#endif
if (!(ngx_event_flags & NGX_USE_IOCP_EVENT)) {
if (s[i].remain) {
/*
* delete the old accept events that were bound to
* the old cycle read events array
*/
if (ngx_del_event(&cycle->old_cycle->read_events[fd],
NGX_READ_EVENT, NGX_CLOSE_EVENT) == NGX_ERROR)
{
return NGX_ERROR;
}
cycle->old_cycle->connections[fd].fd = (ngx_socket_t) -1;
}
}
#if (NGX_WIN32)
if (ngx_event_flags & NGX_USE_IOCP_EVENT) {
rev->event_handler = ngx_event_acceptex;
if (ngx_add_event(rev, 0, NGX_IOCP_ACCEPT) == NGX_ERROR) {
return NGX_ERROR;
}
iocpcf = ngx_event_get_conf(cycle->conf_ctx, ngx_iocp_module);
if (ngx_event_post_acceptex(&s[i], iocpcf->post_acceptex)
== NGX_ERROR)
{
return NGX_ERROR;
}
} else {
rev->event_handler = ngx_event_accept;
if (ngx_add_event(rev, NGX_READ_EVENT, 0) == NGX_ERROR) {
return NGX_ERROR;
}
}
#else
rev->event_handler = ngx_event_accept;
if (ngx_accept_mutex) {
continue;
}
if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
if (ngx_add_conn(c) == NGX_ERROR) {
return NGX_ERROR;
}
} else {
if (ngx_add_event(rev, NGX_READ_EVENT, 0) == NGX_ERROR) {
return NGX_ERROR;
}
}
#endif
}
return NGX_OK;
}
ngx_int_t ngx_send_lowat(ngx_connection_t *c, size_t lowat)
{
int sndlowat;
#if (NGX_HAVE_LOWAT_EVENT)
if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
c->write->available = lowat;
return NGX_OK;
}
#endif
if (lowat == 0 || c->sndlowat) {
return NGX_OK;
}
sndlowat = (int) lowat;
if (setsockopt(c->fd, SOL_SOCKET, SO_SNDLOWAT,
(const void *) &sndlowat, sizeof(int)) == -1)
{
ngx_connection_error(c, ngx_socket_errno,
"setsockopt(SO_SNDLOWAT) failed");
return NGX_ERROR;
}
c->sndlowat = 1;
return NGX_OK;
}
static char *ngx_events_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
int m;
char *rv;
void ***ctx;
ngx_conf_t pcf;
ngx_event_module_t *module;
/* count the number of the event modules and set up their indices */
ngx_event_max_module = 0;
for (m = 0; ngx_modules[m]; m++) {
if (ngx_modules[m]->type != NGX_EVENT_MODULE) {
continue;
}
ngx_modules[m]->ctx_index = ngx_event_max_module++;
}
ngx_test_null(ctx, ngx_pcalloc(cf->pool, sizeof(void *)), NGX_CONF_ERROR);
ngx_test_null(*ctx,
ngx_pcalloc(cf->pool, ngx_event_max_module * sizeof(void *)),
NGX_CONF_ERROR);
*(void **) conf = ctx;
for (m = 0; ngx_modules[m]; m++) {
if (ngx_modules[m]->type != NGX_EVENT_MODULE) {
continue;
}
module = ngx_modules[m]->ctx;
if (module->create_conf) {
ngx_test_null((*ctx)[ngx_modules[m]->ctx_index],
module->create_conf(cf->cycle),
NGX_CONF_ERROR);
}
}
pcf = *cf;
cf->ctx = ctx;
cf->module_type = NGX_EVENT_MODULE;
cf->cmd_type = NGX_EVENT_CONF;
rv = ngx_conf_parse(cf, NULL);
*cf = pcf;
if (rv != NGX_CONF_OK)
return rv;
for (m = 0; ngx_modules[m]; m++) {
if (ngx_modules[m]->type != NGX_EVENT_MODULE) {
continue;
}
module = ngx_modules[m]->ctx;
if (module->init_conf) {
rv = module->init_conf(cf->cycle,
(*ctx)[ngx_modules[m]->ctx_index]);
if (rv != NGX_CONF_OK) {
return rv;
}
}
}
return NGX_CONF_OK;
}
static char *ngx_event_connections(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf)
{
ngx_event_conf_t *ecf = conf;
ngx_str_t *value;
if (ecf->connections != NGX_CONF_UNSET_UINT) {
return "is duplicate" ;
}
value = cf->args->elts;
ecf->connections = ngx_atoi(value[1].data, value[1].len);
if (ecf->connections == (ngx_uint_t) NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid number \"%V\"", &value[1]);
return NGX_CONF_ERROR;
}
cf->cycle->connection_n = ecf->connections;
return NGX_CONF_OK;
}
static char *ngx_event_use(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_event_conf_t *ecf = conf;
ngx_int_t m;
ngx_str_t *value;
ngx_event_conf_t *old_ecf;
ngx_event_module_t *module;
if (ecf->use != NGX_CONF_UNSET_UINT) {
return "is duplicate" ;
}
value = cf->args->elts;
if (cf->cycle->old_cycle->conf_ctx) {
old_ecf = ngx_event_get_conf(cf->cycle->old_cycle->conf_ctx,
ngx_event_core_module);
} else {
old_ecf = NULL;
}
for (m = 0; ngx_modules[m]; m++) {
if (ngx_modules[m]->type != NGX_EVENT_MODULE) {
continue;
}
module = ngx_modules[m]->ctx;
if (module->name->len == value[1].len) {
if (ngx_strcmp(module->name->data, value[1].data) == 0) {
ecf->use = ngx_modules[m]->ctx_index;
ecf->name = module->name->data;
if (ngx_process == NGX_PROCESS_SINGLE
&& old_ecf
&& old_ecf->use != ecf->use)
{
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"when the server runs without a master process "
"the \"%V\" event type must be the same as "
"in previous configuration - \"%s\" "
"and it can not be changed on the fly, "
"to change it you need to stop server "
"and start it again",
&value[1], old_ecf->name);
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}
}
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid event type \"%V\"", &value[1]);
return NGX_CONF_ERROR;
}
static char *ngx_event_debug_connection(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf)
{
#if (NGX_DEBUG)
ngx_event_conf_t *ecf = conf;
in_addr_t *addr;
ngx_str_t *value;
struct hostent *h;
value = cf->args->elts;
/* AF_INET only */
if (!(addr = ngx_push_array(&ecf->debug_connection))) {
return NGX_CONF_ERROR;
}
*addr = inet_addr((char *) value[1].data);
if (*addr != INADDR_NONE) {
return NGX_OK;
}
h = gethostbyname((char *) value[1].data);
if (h == NULL || h->h_addr_list[0] == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"host \"%s\" not found", value[1].data);
return NGX_CONF_ERROR;
}
*addr = *(in_addr_t *)(h->h_addr_list[0]);
#else
ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
"\"debug_connection\" is ignored, you need to rebuild "
"nginx using --with-debug option to enable it");
#endif
return NGX_OK;
}
static void *ngx_event_create_conf(ngx_cycle_t *cycle)
{
ngx_event_conf_t *ecf;
ngx_test_null(ecf, ngx_palloc(cycle->pool, sizeof(ngx_event_conf_t)),
NGX_CONF_ERROR);
ecf->connections = NGX_CONF_UNSET_UINT;
ecf->use = NGX_CONF_UNSET_UINT;
ecf->multi_accept = NGX_CONF_UNSET;
ecf->accept_mutex = NGX_CONF_UNSET;
ecf->accept_mutex_delay = NGX_CONF_UNSET_MSEC;
ecf->name = (void *) NGX_CONF_UNSET;
#if (NGX_DEBUG)
ngx_init_array(ecf->debug_connection, cycle->pool, 5, sizeof(in_addr_t),
NGX_CONF_ERROR);
#endif
return ecf;
}
static char *ngx_event_init_conf(ngx_cycle_t *cycle, void *conf)
{
ngx_event_conf_t *ecf = conf;
int fd, rtsig;
ngx_int_t i, connections;
ngx_module_t *module;
ngx_core_conf_t *ccf;
ngx_event_module_t *event_module;
connections = NGX_CONF_UNSET_UINT;
module = NULL;
rtsig = 0;
fd = 0;
#if (NGX_HAVE_EPOLL) && !(NGX_TEST_BUILD_EPOLL)
fd = epoll_create(100);
if (fd != -1) {
close(fd);
connections = DEFAULT_CONNECTIONS;
module = &ngx_epoll_module;
} else if (ngx_errno != NGX_ENOSYS) {
connections = DEFAULT_CONNECTIONS;
module = &ngx_epoll_module;
}
#endif
#if (NGX_HAVE_RTSIG)
if (module == NULL) {
connections = DEFAULT_CONNECTIONS;
module = &ngx_rtsig_module;
rtsig = 1;
}
#endif
#if (NGX_HAVE_DEVPOLL)
connections = DEFAULT_CONNECTIONS;
module = &ngx_devpoll_module;
#endif
#if (NGX_HAVE_KQUEUE)
connections = DEFAULT_CONNECTIONS;
module = &ngx_kqueue_module;
#endif
#if (NGX_HAVE_SELECT)
if (module == NULL) {
#if (NGX_WIN32)
connections = DEFAULT_CONNECTIONS;
#else
connections = FD_SETSIZE < DEFAULT_CONNECTIONS ? FD_SETSIZE:
DEFAULT_CONNECTIONS;
#endif
module = &ngx_select_module;
}
#endif
if (module == NULL) {
for (i = 0; ngx_modules[i]; i++) {
if (ngx_modules[i]->type == NGX_EVENT_MODULE) {
event_module = ngx_modules[i]->ctx;
if (ngx_strcmp(event_module->name->data, event_core_name.data)
== 0)
{
continue;
}
module = ngx_modules[i];
break;
}
}
}
if (module == NULL) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, 0, "no events module found");
return NGX_CONF_ERROR;
}
ngx_conf_init_unsigned_value(ecf->connections, connections);
cycle->connection_n = ecf->connections;
ngx_conf_init_unsigned_value(ecf->use, module->ctx_index);
event_module = module->ctx;
ngx_conf_init_ptr_value(ecf->name, event_module->name->data);
ngx_conf_init_value(ecf->multi_accept, 0);
ngx_conf_init_value(ecf->accept_mutex, 1);
ngx_conf_init_msec_value(ecf->accept_mutex_delay, 500);
if (!rtsig || ecf->accept_mutex) {
return NGX_CONF_OK;
}
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
if (ccf->worker_processes == 0) {
return NGX_CONF_OK;
}
ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
"the \"rtsig\" method requires \"accept_mutex\" to be on");
return NGX_CONF_ERROR;
}
static char *ngx_accept_mutex_check(ngx_conf_t *cf, void *post, void *data)
{
#if !(NGX_HAVE_ATOMIC_OPS)
ngx_flag_t *fp = data;
*fp = 0;
ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
"\"accept_mutex\" is not supported, ignored");
#endif
return NGX_CONF_OK;
}
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