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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/* Cherokee
*
* Authors:
* Alvaro Lopez Ortega <alvaro@alobbs.com>
*
* Copyright (C) 2001-2011 Alvaro Lopez Ortega
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/

#include "common-internal.h"
#include "fdpoll-protected.h"
#include "util.h"

#include <stdio.h>
#include <poll.h>
#include <port.h>
#include <unistd.h>
#include <errno.h>

#define POLL_READ (POLLIN)
#define POLL_WRITE (POLLOUT)
#define POLL_ERROR (POLLHUP | POLLERR | POLLNVAL)



/***********************************************************************/
/* Solaris 10: Event ports */
/* */
/* #include <port.h> */
/* */
/* int port_get (int port, port_event_t *pe, */
/* const timespec_t *timeout); */
/* */
/* Info: */
/* http://iforce.sun.com/protected/solaris10/adoptionkit/tech/tecf.html*/
/* */
/* Event ports is an event completion framework that provides a */
/* scalable way for multiple threads or processes to wait for multiple */
/* pending asynchronous events from multiple objects. */
/* */
/***********************************************************************/


typedef struct {
struct cherokee_fdpoll poll;

int port;
port_event_t *port_events;
int *port_activefd;
int port_readyfds;
} cherokee_fdpoll_port_t;


static ret_t
fd_associate (cherokee_fdpoll_port_t *fdp, int fd, void *rw_mode)
{
int rc;
int events = 0;

if (*rw_mode & poll_mode_read) {
events |= POLL_READ;
}

if (*rw_mode & poll_mode_write) {
events |= POLL_WRITE;
}

rc = port_associate (fdp->port, /* port */
PORT_SOURCE_FD, /* source */
fd, /* object */
events, /* events */
rw_mode); /* user data */
if ( rc == -1 ) {
LOG_ERRNO (errno, cherokee_err_error,
CHEROKEE_ERROR_FDPOLL_PORTS_ASSOCIATE, fd);
return ret_error;
}

return ret_ok;
}


static ret_t
_free (cherokee_fdpoll_port_t *fdp)
{
if (fdp == NULL)
return ret_ok;

if ( fdp->port >= 0 ) {
close (fdp->port);
}

/* ANSI C required, so that free() can handle NULL pointers
*/
free( fdp->port_events );
free( fdp->port_activefd );

/* Caller has to set this pointer to NULL.
*/
free( fdp );

return ret_ok;
}


static ret_t
_add (cherokee_fdpoll_port_t *fdp, int fd, int rw_mode)
{
int rc;

rc = fd_associate (fdp, fd, rw_mode);
if (rc == -1) {
LOG_ERRNO (errno, cherokee_err_error,
CHEROKEE_ERROR_FDPOLL_PORTS_FD_ASSOCIATE, fd);
return ret_error;
}

FDPOLL(fdp)->npollfds++;
return ret_ok;
}


static ret_t
_del (cherokee_fdpoll_port_t *fdp, int fd)
{
int rc;

rc = port_dissociate( fdp->port, /* port */
PORT_SOURCE_FD, /* source */
fd); /* object */
if ( rc == -1 ) {
LOG_ERRNO (errno, cherokee_err_error,
CHEROKEE_ERROR_FDPOLL_PORTS_ASSOCIATE, fd);
return ret_error;
}

FDPOLL(fdp)->npollfds--;

/* remote fd from the active fd list
*/
fdp->port_activefd[fd] = -1;

return ret_ok;
}


static int
_watch (cherokee_fdpoll_port_t *fdp, int timeout_msecs)
{
int i, rc, fd;
struct timespec timeout;

timeout.tv_sec = timeout_msecs/1000L;
timeout.tv_nsec = ( timeout_msecs % 1000L ) * 1000000L;

for (i=0; i<FDPOLL(fdp)->system_nfiles; i++) {
fdp->port_activefd[i] = -1;
}

/* First call to get the number of file descriptors with activity
*/
rc = port_getn (fdp->port, fdp->port_events, 0,
(uint_t *)&fdp->port_readyfds,
&timeout);
if ( rc < 0 ) {
LOG_ERRNO_S (errno, cherokee_err_error, CHEROKEE_ERROR_FDPOLL_PORTS_GETN);
return 0;
}

if ( fdp->port_readyfds == 0 ) {
/* Get at least 1 fd to wait for activity
*/
fdp->port_readyfds = 1;
}

/* Second call to get the events of the file descriptors with
* activity
*/
rc = port_getn (fdp->port, fdp->port_events,FDPOLL(fdp)->nfiles,
&fdp->port_readyfds, &timeout);
if ( ( (rc < 0) && (errno != ETIME) ) || (fdp->port_readyfds == -1)) {
LOG_ERRNO_S (errno, cherokee_err_error, CHEROKEE_ERROR_FDPOLL_PORTS_GETN);
return 0;
}

for ( i = 0; i < fdp->port_readyfds; ++i ) {
int nfd;

nfd = fdp->port_events[i].portev_object;
fdp->port_activefd[nfd] = fdp->port_events[i].portev_events;
rc = fd_associate( fdp,
nfd,
fdp->port_events[i].portev_user);
if ( rc < 0 ) {
LOG_ERRNO (errno, cherokee_err_error,
CHEROKEE_ERROR_FDPOLL_PORTS_FD_ASSOCIATE, nfd);
}
}

return fdp->port_readyfds;
}


static int
_check (cherokee_fdpoll_port_t *fdp, int fd, int rw_mode)
{
uint32_t events = 0;

/* Sanity check: is it a wrong fd?
*/
if (unlikely (fd < 0)) {
return -1;
}

events = fdp->port_activefd[fd];
if (events == -1) {
return 0;
}

/* Check
*/
if ((rw_mode & poll_mode_read) && (events & POLL_READ)) {
return 1;
}

if ((rw_mode & poll_mode_write) && (events & POLL_WRITE)) {
return 1;
}

if (events & POLL_ERROR) {
return 1;
}

return 0;
}


static ret_t
_reset (cherokee_fdpoll_port_t *fdp, int fd)
{
UNUSED (fdp);
UNUSED (fd);

return ret_ok;
}


static ret_t
_set_mode (cherokee_fdpoll_port_t *fdp, int fd, int rw_mode)
{
int rc;
int events = 0;

/* Events
*/
if (rw_mode & poll_mode_read) {
events |= POLLIN;
}

if (rw_mode & poll_mode_write) {
events |= POLLOUT;
}

/* Set it
*/
rc = port_associate (fdp->port,
PORT_SOURCE_FD,
fd, events, rw_mode);
if ( rc == -1 ) {
LOG_ERRNO (errno, cherokee_err_error,
CHEROKEE_ERROR_FDPOLL_PORTS_ASSOCIATE, fd);
return ret_error;
}

return ret_ok;
}


ret_t
fdpoll_port_get_fdlimits (cuint_t *system_fd_limit, cuint_t *fd_limit)
{
*system_fd_limit = 0;
*fd_limit = 0;

return ret_ok;
}


ret_t
fdpoll_port_new (cherokee_fdpoll_t **fdp, int sys_limit, int limit)
{
int re;
cuint_t i;
cherokee_fdpoll_t *nfd;
CHEROKEE_CNEW_STRUCT (1, n, fdpoll_port);

nfd = FDPOLL(n);

/* Init base class properties
*/
nfd->type = cherokee_poll_port;
nfd->nfiles = limit;
nfd->system_nfiles = sys_limit;
nfd->npollfds = 0;

/* Init base class virtual methods
*/
nfd->free = (fdpoll_func_free_t) _free;
nfd->add = (fdpoll_func_add_t) _add;
nfd->del = (fdpoll_func_del_t) _del;
nfd->reset = (fdpoll_func_reset_t) _reset;
nfd->set_mode = (fdpoll_func_set_mode_t) _set_mode;
nfd->check = (fdpoll_func_check_t) _check;
nfd->watch = (fdpoll_func_watch_t) _watch;

/* Allocate data
*/
n->port = -1;
n->port_readyfds = 0;
n->port_events = (port_event_t *) calloc(nfd->nfiles, sizeof(port_event_t));
n->port_activefd = (int *) calloc(nfd->system_nfiles, sizeof(int));

if ( n->port_events == NULL || n->port_activefd == NULL ) {
_free( n );
return ret_nomem;
}

for (i=0; i < nfd->system_nfiles; i++) {
n->port_activefd[i] = -1;
}

n->port = port_create();
if (n->port == -1 ) {
_free( n );
return ret_error;
}

re = fcntl (n->port, F_SETFD, FD_CLOEXEC);
if (re < 0) {
LOG_ERRNO (errno, cherokee_err_error,
CHEROKEE_ERROR_FDPOLL_EPOLL_CLOEXEC);
_free (n);
return ret_error;
}

/* Return the object
*/
*fdp = nfd;
return ret_ok;
}

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