Mercurial > hg > nginx
view src/event/modules/ngx_poll_module.c @ 485:4ebe09b07e30 release-0.1.17
nginx-0.1.17-RELEASE import
*) Change: the ngx_http_rewrite_module was rewritten from the scratch.
Now it is possible to redirect, to return the error codes, to check
the variables and referrers. The directives can be used inside
locations. The redirect directive was canceled.
*) Feature: the ngx_http_geo_module.
*) Feature: the proxy_set_x_var and fastcgi_set_var directives.
*) Bugfix: the location configuration with "=" modifier may be used in
another location.
*) Bugfix: the correct content type was set only for requests that use
small caps letters in extension.
*) Bugfix: if the proxy_pass or fastcgi_pass directives were set in the
location, and access was denied, and the error was redirected to a
static page, then the segmentation fault occurred.
*) Bugfix: if in a proxied "Location" header was a relative URL, then a
host name and a slash were added to them; the bug had appeared in
0.1.14.
*) Bugfix: the system error message was not logged on Linux.
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Thu, 03 Feb 2005 19:33:37 +0000 |
parents | 621229427cba |
children | 64d9afb209da |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> static ngx_int_t ngx_poll_init(ngx_cycle_t *cycle); static void ngx_poll_done(ngx_cycle_t *cycle); static ngx_int_t ngx_poll_add_event(ngx_event_t *ev, int event, u_int flags); static ngx_int_t ngx_poll_del_event(ngx_event_t *ev, int event, u_int flags); static ngx_int_t ngx_poll_process_events(ngx_cycle_t *cycle); static char *ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf); static struct pollfd *event_list; static int nevents; #if 0 static ngx_event_t **ready_index; #endif static ngx_event_t *accept_events; static ngx_str_t poll_name = ngx_string("poll"); ngx_event_module_t ngx_poll_module_ctx = { &poll_name, NULL, /* create configuration */ ngx_poll_init_conf, /* init configuration */ { ngx_poll_add_event, /* add an event */ ngx_poll_del_event, /* delete an event */ ngx_poll_add_event, /* enable an event */ ngx_poll_del_event, /* disable an event */ NULL, /* add an connection */ NULL, /* delete an connection */ NULL, /* process the changes */ ngx_poll_process_events, /* process the events */ ngx_poll_init, /* init the events */ ngx_poll_done /* done the events */ } }; ngx_module_t ngx_poll_module = { NGX_MODULE, &ngx_poll_module_ctx, /* module context */ NULL, /* module directives */ NGX_EVENT_MODULE, /* module type */ NULL, /* init module */ NULL /* init process */ }; static ngx_int_t ngx_poll_init(ngx_cycle_t *cycle) { struct pollfd *list; if (event_list == NULL) { nevents = 0; } if (ngx_process == NGX_PROCESS_WORKER || cycle->old_cycle == NULL || cycle->old_cycle->connection_n < cycle->connection_n) { ngx_test_null(list, ngx_alloc(sizeof(struct pollfd) * cycle->connection_n, cycle->log), NGX_ERROR); if (event_list) { ngx_memcpy(list, event_list, sizeof(ngx_event_t *) * nevents); ngx_free(event_list); } event_list = list; #if 0 if (ready_index) { ngx_free(ready_index); } ngx_test_null(ready_index, ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n, cycle->log), NGX_ERROR); #endif } ngx_io = ngx_os_io; ngx_event_actions = ngx_poll_module_ctx.actions; ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_ONESHOT_EVENT; return NGX_OK; } static void ngx_poll_done(ngx_cycle_t *cycle) { ngx_free(event_list); #if 0 ngx_free(ready_index); #endif event_list = NULL; #if 0 ready_index = NULL; #endif } static ngx_int_t ngx_poll_add_event(ngx_event_t *ev, int event, u_int flags) { ngx_event_t *e; ngx_connection_t *c; c = ev->data; ev->active = 1; if (ev->index != NGX_INVALID_INDEX) { ngx_log_error(NGX_LOG_ALERT, ev->log, 0, "poll event fd:%d ev:%d is already set", c->fd, event); return NGX_OK; } if (event == NGX_READ_EVENT) { e = c->write; #if (NGX_READ_EVENT != POLLIN) event = POLLIN; #endif } else { e = c->read; #if (NGX_WRITE_EVENT != POLLOUT) event = POLLOUT; #endif } ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, "poll add event: fd:%d ev:%d", c->fd, event); if (e == NULL || e->index == NGX_INVALID_INDEX) { event_list[nevents].fd = c->fd; event_list[nevents].events = event; event_list[nevents].revents = 0; ev->index = nevents; nevents++; } else { ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0, "poll add index: %d", e->index); event_list[e->index].events |= event; ev->index = e->index; } ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0; return NGX_OK; } static ngx_int_t ngx_poll_del_event(ngx_event_t *ev, int event, u_int flags) { ngx_uint_t i; ngx_cycle_t **cycle; ngx_event_t *e; ngx_connection_t *c; c = ev->data; ev->active = 0; if (ev->index == NGX_INVALID_INDEX) { ngx_log_error(NGX_LOG_ALERT, ev->log, 0, "poll event fd:%d ev:%d is already deleted", c->fd, event); return NGX_OK; } if (event == NGX_READ_EVENT) { e = c->write; #if (NGX_READ_EVENT != POLLIN) event = POLLIN; #endif } else { e = c->read; #if (NGX_WRITE_EVENT != POLLOUT) event = POLLOUT; #endif } ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, "poll del event: fd:%d ev:%d", c->fd, event); if (e == NULL || e->index == NGX_INVALID_INDEX) { nevents--; if (ev->index < (u_int) nevents) { ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, "index: copy event %d to %d", nevents, ev->index); event_list[ev->index] = event_list[nevents]; c = &ngx_cycle->connections[event_list[nevents].fd]; if (c->fd == -1) { cycle = ngx_old_cycles.elts; for (i = 0; i < ngx_old_cycles.nelts; i++) { if (cycle[i] == NULL) { continue; } c = &cycle[i]->connections[event_list[nevents].fd]; if (c->fd != -1) { break; } } } if (c->fd == -1) { ngx_log_error(NGX_LOG_ALERT, ev->log, 0, "unexpected last event"); } else { if (c->read->index == (u_int) nevents) { c->read->index = ev->index; } if (c->write->index == (u_int) nevents) { c->write->index = ev->index; } } } } else { ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0, "poll del index: %d", e->index); event_list[e->index].events &= ~event; } ev->index = NGX_INVALID_INDEX; return NGX_OK; } static ngx_int_t ngx_poll_process_events(ngx_cycle_t *cycle) { int ready, revents; ngx_int_t i, nready; ngx_uint_t n, found, lock, expire; ngx_msec_t timer; ngx_err_t err; ngx_cycle_t **old_cycle; ngx_event_t *ev; ngx_epoch_msec_t delta; ngx_connection_t *c; struct timeval tv; for ( ;; ) { timer = ngx_event_find_timer(); if (timer != 0) { break; } ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll expired timer"); ngx_event_expire_timers((ngx_msec_t) (ngx_elapsed_msec - ngx_old_elapsed_msec)); } /* NGX_TIMER_INFINITE == INFTIM */ if (timer == NGX_TIMER_INFINITE) { expire = 0; } else { expire = 1; } ngx_old_elapsed_msec = ngx_elapsed_msec; #if (NGX_DEBUG0) if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) { for (i = 0; i < nevents; i++) { ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll: %d: fd:%d ev:%04Xd", i, event_list[i].fd, event_list[i].events); } } #endif if (ngx_accept_mutex) { if (ngx_accept_disabled > 0) { ngx_accept_disabled--; } else { if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) { return NGX_ERROR; } if (ngx_accept_mutex_held == 0 && (timer == NGX_TIMER_INFINITE || timer > ngx_accept_mutex_delay)) { timer = ngx_accept_mutex_delay; expire = 0; } } } ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %d", timer); ready = poll(event_list, (u_int) nevents, (int) timer); if (ready == -1) { err = ngx_errno; } else { err = 0; } ngx_gettimeofday(&tv); ngx_time_update(tv.tv_sec); delta = ngx_elapsed_msec; ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000 + tv.tv_usec / 1000 - ngx_start_msec; ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll ready %d of %d", ready, nevents); if (err) { ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT, cycle->log, err, "poll() failed"); ngx_accept_mutex_unlock(); return NGX_ERROR; } if (timer != NGX_TIMER_INFINITE) { delta = ngx_elapsed_msec - delta; ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %d, delta: %d", timer, (int) delta); } else { if (ready == 0) { ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll() returned no events without timeout"); ngx_accept_mutex_unlock(); return NGX_ERROR; } } if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) { ngx_accept_mutex_unlock(); return NGX_ERROR; } lock = 1; nready = 0; for (i = 0; i < nevents && ready; i++) { revents = event_list[i].revents; #if 0 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll: %d: fd:%d ev:%04Xd rev:%04Xd", i, event_list[i].fd, event_list[i].events, revents); #else if (revents) { ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll: %d: fd:%d ev:%04Xd rev:%04Xd", i, event_list[i].fd, event_list[i].events, revents); } #endif if (revents & POLLNVAL) { ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll() error fd:%d ev:%04Xd rev:%04Xd", event_list[i].fd, event_list[i].events, revents); } if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) { ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "strange poll() events fd:%d ev:%04Xd rev:%04Xd", event_list[i].fd, event_list[i].events, revents); } if (event_list[i].fd == -1) { /* * the disabled event, a workaround for our possible bug, * see the comment below */ continue; } c = &ngx_cycle->connections[event_list[i].fd]; if (c->fd == -1) { old_cycle = ngx_old_cycles.elts; for (n = 0; n < ngx_old_cycles.nelts; n++) { if (old_cycle[n] == NULL) { continue; } c = &old_cycle[n]->connections[event_list[i].fd]; if (c->fd != -1) { break; } } } if (c->fd == -1) { ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event"); /* * it is certainly our fault and it should be investigated, * in the meantime we disable this event to avoid a CPU spinning */ if (i == nevents - 1) { nevents--; } else { event_list[i].fd = -1; } continue; } if ((revents & (POLLERR|POLLHUP|POLLNVAL)) && (revents & (POLLIN|POLLOUT)) == 0) { /* * if the error events were returned without POLLIN or POLLOUT, * then add these flags to handle the events at least in one * active handler */ revents |= POLLIN|POLLOUT; } found = 0; if (revents & POLLIN) { found = 1; ev = c->read; ev->ready = 1; if (ev->oneshot) { if (ev->timer_set) { ngx_del_timer(ev); } ngx_poll_del_event(ev, NGX_READ_EVENT, 0); } if (ev->accept) { ev->next = accept_events; accept_events = ev; } else { ngx_post_event(ev); } #if 0 ready_index[nready++] = c->read; #endif } if (revents & POLLOUT) { found = 1; ev = c->write; ev->ready = 1; if (ev->oneshot) { if (ev->timer_set) { ngx_del_timer(ev); } ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0); } ngx_post_event(ev); #if 0 ready_index[nready++] = c->write; #endif } if (found) { ready--; continue; } } #if 0 for (i = 0; i < nready; i++) { ev = ready_index[i]; if (!ev->active) { continue; } ev->ready = 1; if (ev->oneshot) { if (ev->timer_set) { ngx_del_timer(ev); } if (ev->write) { ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0); } else { ngx_poll_del_event(ev, NGX_READ_EVENT, 0); } } ev->event_handler(ev); } #endif ev = accept_events; for ( ;; ) { ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "accept event %p", ev); if (ev == NULL) { break; } ngx_mutex_unlock(ngx_posted_events_mutex); ev->event_handler(ev); if (ngx_accept_disabled > 0) { lock = 0; break; } ev = ev->next; if (ev == NULL) { lock = 0; break; } if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) { ngx_accept_mutex_unlock(); return NGX_ERROR; } } ngx_accept_mutex_unlock(); accept_events = NULL; if (lock) { ngx_mutex_unlock(ngx_posted_events_mutex); } if (ready != 0) { ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events"); } if (expire && delta) { ngx_event_expire_timers((ngx_msec_t) delta); } if (!ngx_threaded) { ngx_event_process_posted(cycle); } return nready; } static char *ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf) { ngx_event_conf_t *ecf; ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module); if (ecf->use != ngx_poll_module.ctx_index) { return NGX_CONF_OK; } #if (NGX_THREADS) ngx_log_error(NGX_LOG_EMERG, cycle->log, 0, "poll() is not supported in the threaded mode"); return NGX_CONF_ERROR; #else return NGX_CONF_OK; #endif }