/*
* 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;
rev->available = -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;
}
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