One Level Up
Top Level
src/event/modules/ngx_devpoll_module.c - nginx-1.7.10
Global variables defined
Data types defined
Functions defined
Macros defined
Source code
- #include <ngx_config.h>
- #include <ngx_core.h>
- #include <ngx_event.h>
- #if (NGX_TEST_BUILD_DEVPOLL)
- #define POLLREMOVE 0x0800
- #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
- };
- ngx_event_module_t ngx_devpoll_module_ctx = {
- &devpoll_name,
- ngx_devpoll_create_conf,
- ngx_devpoll_init_conf,
- {
- ngx_devpoll_add_event,
- ngx_devpoll_del_event,
- ngx_devpoll_add_event,
- ngx_devpoll_del_event,
- NULL,
- NULL,
- NULL,
- ngx_devpoll_process_events,
- ngx_devpoll_init,
- ngx_devpoll_done,
- }
- };
- ngx_module_t ngx_devpoll_module = {
- NGX_MODULE_V1,
- &ngx_devpoll_module_ctx,
- ngx_devpoll_commands,
- NGX_EVENT_MODULE,
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- 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;
- }
-
- 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;
- }
- 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_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))
- && (revents & (POLLIN|POLLOUT)) == 0)
- {
-
- 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;
- }
One Level Up
Top Level