diff options
Diffstat (limited to 'app/nginx/src/event/modules/ngx_devpoll_module.c')
| -rw-r--r-- | app/nginx/src/event/modules/ngx_devpoll_module.c | 560 |
1 files changed, 560 insertions, 0 deletions
diff --git a/app/nginx/src/event/modules/ngx_devpoll_module.c b/app/nginx/src/event/modules/ngx_devpoll_module.c new file mode 100644 index 0000000..ee9f854 --- /dev/null +++ b/app/nginx/src/event/modules/ngx_devpoll_module.c @@ -0,0 +1,560 @@ + +/* + * Copyright (C) Igor Sysoev + * Copyright (C) Nginx, Inc. + */ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_event.h> + + +#if (NGX_TEST_BUILD_DEVPOLL) + +/* Solaris declarations */ + +#ifndef POLLREMOVE +#define POLLREMOVE 0x0800 +#endif +#define DP_POLL 0xD001 +#define DP_ISPOLLED 0xD002 + +struct dvpoll { + struct pollfd *dp_fds; + int dp_nfds; + int dp_timeout; +}; + +#endif + + +typedef struct { + ngx_uint_t changes; + ngx_uint_t events; +} ngx_devpoll_conf_t; + + +static ngx_int_t ngx_devpoll_init(ngx_cycle_t *cycle, ngx_msec_t timer); +static void ngx_devpoll_done(ngx_cycle_t *cycle); +static ngx_int_t ngx_devpoll_add_event(ngx_event_t *ev, ngx_int_t event, + ngx_uint_t flags); +static ngx_int_t ngx_devpoll_del_event(ngx_event_t *ev, ngx_int_t event, + ngx_uint_t flags); +static ngx_int_t ngx_devpoll_set_event(ngx_event_t *ev, ngx_int_t event, + ngx_uint_t flags); +static ngx_int_t ngx_devpoll_process_events(ngx_cycle_t *cycle, + ngx_msec_t timer, ngx_uint_t flags); + +static void *ngx_devpoll_create_conf(ngx_cycle_t *cycle); +static char *ngx_devpoll_init_conf(ngx_cycle_t *cycle, void *conf); + +static int dp = -1; +static struct pollfd *change_list, *event_list; +static ngx_uint_t nchanges, max_changes, nevents; + +static ngx_event_t **change_index; + + +static ngx_str_t devpoll_name = ngx_string("/dev/poll"); + +static ngx_command_t ngx_devpoll_commands[] = { + + { ngx_string("devpoll_changes"), + NGX_EVENT_CONF|NGX_CONF_TAKE1, + ngx_conf_set_num_slot, + 0, + offsetof(ngx_devpoll_conf_t, changes), + NULL }, + + { ngx_string("devpoll_events"), + NGX_EVENT_CONF|NGX_CONF_TAKE1, + ngx_conf_set_num_slot, + 0, + offsetof(ngx_devpoll_conf_t, events), + NULL }, + + ngx_null_command +}; + + +static ngx_event_module_t ngx_devpoll_module_ctx = { + &devpoll_name, + ngx_devpoll_create_conf, /* create configuration */ + ngx_devpoll_init_conf, /* init configuration */ + + { + ngx_devpoll_add_event, /* add an event */ + ngx_devpoll_del_event, /* delete an event */ + ngx_devpoll_add_event, /* enable an event */ + ngx_devpoll_del_event, /* disable an event */ + NULL, /* add an connection */ + NULL, /* delete an connection */ + NULL, /* trigger a notify */ + ngx_devpoll_process_events, /* process the events */ + ngx_devpoll_init, /* init the events */ + ngx_devpoll_done, /* done the events */ + } + +}; + +ngx_module_t ngx_devpoll_module = { + NGX_MODULE_V1, + &ngx_devpoll_module_ctx, /* module context */ + ngx_devpoll_commands, /* module directives */ + NGX_EVENT_MODULE, /* module type */ + NULL, /* init master */ + NULL, /* init module */ + NULL, /* init process */ + NULL, /* init thread */ + NULL, /* exit thread */ + NULL, /* exit process */ + NULL, /* exit master */ + NGX_MODULE_V1_PADDING +}; + + +static ngx_int_t +ngx_devpoll_init(ngx_cycle_t *cycle, ngx_msec_t timer) +{ + size_t n; + ngx_devpoll_conf_t *dpcf; + + dpcf = ngx_event_get_conf(cycle->conf_ctx, ngx_devpoll_module); + + if (dp == -1) { + dp = open("/dev/poll", O_RDWR); + + if (dp == -1) { + ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno, + "open(/dev/poll) failed"); + return NGX_ERROR; + } + } + + if (max_changes < dpcf->changes) { + if (nchanges) { + n = nchanges * sizeof(struct pollfd); + if (write(dp, change_list, n) != (ssize_t) n) { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, + "write(/dev/poll) failed"); + return NGX_ERROR; + } + + nchanges = 0; + } + + if (change_list) { + ngx_free(change_list); + } + + change_list = ngx_alloc(sizeof(struct pollfd) * dpcf->changes, + cycle->log); + if (change_list == NULL) { + return NGX_ERROR; + } + + if (change_index) { + ngx_free(change_index); + } + + change_index = ngx_alloc(sizeof(ngx_event_t *) * dpcf->changes, + cycle->log); + if (change_index == NULL) { + return NGX_ERROR; + } + } + + max_changes = dpcf->changes; + + if (nevents < dpcf->events) { + if (event_list) { + ngx_free(event_list); + } + + event_list = ngx_alloc(sizeof(struct pollfd) * dpcf->events, + cycle->log); + if (event_list == NULL) { + return NGX_ERROR; + } + } + + nevents = dpcf->events; + + ngx_io = ngx_os_io; + + ngx_event_actions = ngx_devpoll_module_ctx.actions; + + ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_FD_EVENT; + + return NGX_OK; +} + + +static void +ngx_devpoll_done(ngx_cycle_t *cycle) +{ + if (close(dp) == -1) { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, + "close(/dev/poll) failed"); + } + + dp = -1; + + ngx_free(change_list); + ngx_free(event_list); + ngx_free(change_index); + + change_list = NULL; + event_list = NULL; + change_index = NULL; + max_changes = 0; + nchanges = 0; + nevents = 0; +} + + +static ngx_int_t +ngx_devpoll_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags) +{ +#if (NGX_DEBUG) + ngx_connection_t *c; +#endif + +#if (NGX_READ_EVENT != POLLIN) + event = (event == NGX_READ_EVENT) ? POLLIN : POLLOUT; +#endif + +#if (NGX_DEBUG) + c = ev->data; + ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, + "devpoll add event: fd:%d ev:%04Xi", c->fd, event); +#endif + + ev->active = 1; + + return ngx_devpoll_set_event(ev, event, 0); +} + + +static ngx_int_t +ngx_devpoll_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags) +{ + ngx_event_t *e; + ngx_connection_t *c; + + c = ev->data; + +#if (NGX_READ_EVENT != POLLIN) + event = (event == NGX_READ_EVENT) ? POLLIN : POLLOUT; +#endif + + ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, + "devpoll del event: fd:%d ev:%04Xi", c->fd, event); + + if (ngx_devpoll_set_event(ev, POLLREMOVE, flags) == NGX_ERROR) { + return NGX_ERROR; + } + + ev->active = 0; + + if (flags & NGX_CLOSE_EVENT) { + e = (event == POLLIN) ? c->write : c->read; + + if (e) { + e->active = 0; + } + + return NGX_OK; + } + + /* restore the pair event if it exists */ + + if (event == POLLIN) { + e = c->write; + event = POLLOUT; + + } else { + e = c->read; + event = POLLIN; + } + + if (e && e->active) { + return ngx_devpoll_set_event(e, event, 0); + } + + return NGX_OK; +} + + +static ngx_int_t +ngx_devpoll_set_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags) +{ + size_t n; + ngx_connection_t *c; + + c = ev->data; + + ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0, + "devpoll fd:%d ev:%04Xi fl:%04Xi", c->fd, event, flags); + + if (nchanges >= max_changes) { + ngx_log_error(NGX_LOG_WARN, ev->log, 0, + "/dev/pool change list is filled up"); + + n = nchanges * sizeof(struct pollfd); + if (write(dp, change_list, n) != (ssize_t) n) { + ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno, + "write(/dev/poll) failed"); + return NGX_ERROR; + } + + nchanges = 0; + } + + change_list[nchanges].fd = c->fd; + change_list[nchanges].events = (short) event; + change_list[nchanges].revents = 0; + + change_index[nchanges] = ev; + ev->index = nchanges; + + nchanges++; + + if (flags & NGX_CLOSE_EVENT) { + n = nchanges * sizeof(struct pollfd); + if (write(dp, change_list, n) != (ssize_t) n) { + ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno, + "write(/dev/poll) failed"); + return NGX_ERROR; + } + + nchanges = 0; + } + + return NGX_OK; +} + + +static ngx_int_t +ngx_devpoll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, + ngx_uint_t flags) +{ + int events, revents, rc; + size_t n; + ngx_fd_t fd; + ngx_err_t err; + ngx_int_t i; + ngx_uint_t level, instance; + ngx_event_t *rev, *wev; + ngx_queue_t *queue; + ngx_connection_t *c; + struct pollfd pfd; + struct dvpoll dvp; + + /* NGX_TIMER_INFINITE == INFTIM */ + + ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, + "devpoll timer: %M", timer); + + if (nchanges) { + n = nchanges * sizeof(struct pollfd); + if (write(dp, change_list, n) != (ssize_t) n) { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, + "write(/dev/poll) failed"); + return NGX_ERROR; + } + + nchanges = 0; + } + + dvp.dp_fds = event_list; + dvp.dp_nfds = (int) nevents; + dvp.dp_timeout = timer; + events = ioctl(dp, DP_POLL, &dvp); + + err = (events == -1) ? ngx_errno : 0; + + if (flags & NGX_UPDATE_TIME || ngx_event_timer_alarm) { + ngx_time_update(); + } + + if (err) { + if (err == NGX_EINTR) { + + if (ngx_event_timer_alarm) { + ngx_event_timer_alarm = 0; + return NGX_OK; + } + + level = NGX_LOG_INFO; + + } else { + level = NGX_LOG_ALERT; + } + + ngx_log_error(level, cycle->log, err, "ioctl(DP_POLL) failed"); + return NGX_ERROR; + } + + if (events == 0) { + if (timer != NGX_TIMER_INFINITE) { + return NGX_OK; + } + + ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, + "ioctl(DP_POLL) returned no events without timeout"); + return NGX_ERROR; + } + + for (i = 0; i < events; i++) { + + fd = event_list[i].fd; + revents = event_list[i].revents; + + c = ngx_cycle->files[fd]; + + if (c == NULL || c->fd == -1) { + + pfd.fd = fd; + pfd.events = 0; + pfd.revents = 0; + + rc = ioctl(dp, DP_ISPOLLED, &pfd); + + switch (rc) { + + case -1: + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, + "ioctl(DP_ISPOLLED) failed for socket %d, event %04Xd", + fd, revents); + break; + + case 0: + ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, + "phantom event %04Xd for closed and removed socket %d", + revents, fd); + break; + + default: + ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, + "unexpected event %04Xd for closed and removed socket %d, " + "ioctl(DP_ISPOLLED) returned rc:%d, fd:%d, event %04Xd", + revents, fd, rc, pfd.fd, pfd.revents); + + pfd.fd = fd; + pfd.events = POLLREMOVE; + pfd.revents = 0; + + if (write(dp, &pfd, sizeof(struct pollfd)) + != (ssize_t) sizeof(struct pollfd)) + { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, + "write(/dev/poll) for %d failed", fd); + } + + if (close(fd) == -1) { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, + "close(%d) failed", fd); + } + + break; + } + + continue; + } + + ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0, + "devpoll: fd:%d, ev:%04Xd, rev:%04Xd", + fd, event_list[i].events, revents); + + if (revents & (POLLERR|POLLHUP|POLLNVAL)) { + ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0, + "ioctl(DP_POLL) error fd:%d ev:%04Xd rev:%04Xd", + fd, event_list[i].events, revents); + } + + if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) { + ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, + "strange ioctl(DP_POLL) events " + "fd:%d ev:%04Xd rev:%04Xd", + fd, event_list[i].events, revents); + } + + if (revents & (POLLERR|POLLHUP|POLLNVAL)) { + + /* + * if the error events were returned, add POLLIN and POLLOUT + * to handle the events at least in one active handler + */ + + revents |= POLLIN|POLLOUT; + } + + rev = c->read; + + if ((revents & POLLIN) && rev->active) { + rev->ready = 1; + + if (flags & NGX_POST_EVENTS) { + queue = rev->accept ? &ngx_posted_accept_events + : &ngx_posted_events; + + ngx_post_event(rev, queue); + + } else { + instance = rev->instance; + + rev->handler(rev); + + if (c->fd == -1 || rev->instance != instance) { + continue; + } + } + } + + wev = c->write; + + if ((revents & POLLOUT) && wev->active) { + wev->ready = 1; + + if (flags & NGX_POST_EVENTS) { + ngx_post_event(wev, &ngx_posted_events); + + } else { + wev->handler(wev); + } + } + } + + return NGX_OK; +} + + +static void * +ngx_devpoll_create_conf(ngx_cycle_t *cycle) +{ + ngx_devpoll_conf_t *dpcf; + + dpcf = ngx_palloc(cycle->pool, sizeof(ngx_devpoll_conf_t)); + if (dpcf == NULL) { + return NULL; + } + + dpcf->changes = NGX_CONF_UNSET; + dpcf->events = NGX_CONF_UNSET; + + return dpcf; +} + + +static char * +ngx_devpoll_init_conf(ngx_cycle_t *cycle, void *conf) +{ + ngx_devpoll_conf_t *dpcf = conf; + + ngx_conf_init_uint_value(dpcf->changes, 32); + ngx_conf_init_uint_value(dpcf->events, 32); + + return NGX_CONF_OK; +} |