Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

324 lines (257 sloc) 7.263 kb
/* -*- 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 <errno.h>
#ifdef HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#ifndef INFTIM
# define INFTIM -1
#endif
/***********************************************************************/
/* select() */
/* */
/* #include <sys/select.h> */
/* int select(int n, fd_set *readfds, fd_set *writefds, */
/* fd_set *exceptfds, struct timeval *timeout); */
/* */
/***********************************************************************/
typedef struct {
struct cherokee_fdpoll poll;
int *fd_rw;
fd_set master_rfdset;
fd_set master_wfdset;
fd_set working_rfdset;
fd_set working_wfdset;
int *select_fds;
int *select_fdidx;
int *select_rfdidx;
int maxfd;
int maxfd_recompute;
} cherokee_fdpoll_select_t;
static ret_t
_free (cherokee_fdpoll_select_t *fdp)
{
if (fdp == NULL)
return ret_ok;
/* ANSI C required, so that free() can handle NULL pointers
*/
free (fdp->select_fds);
free (fdp->select_fdidx);
free (fdp->select_rfdidx);
free (fdp->fd_rw);
/* Caller has to set this pointer to NULL.
*/
free (fdp);
return ret_ok;
}
static ret_t
_add (cherokee_fdpoll_select_t *fdp, int fd, int rw)
{
cherokee_fdpoll_t *nfd = FDPOLL(fdp);
/* Check the fd limit
*/
if (cherokee_fdpoll_is_full(FDPOLL(fdp))) {
PRINT_ERROR_S("select_add: fdpoll is full !\n");
return ret_error;
}
fdp->select_fds[nfd->npollfds] = fd;
switch (rw) {
case FDPOLL_MODE_READ:
FD_SET (fd, &fdp->master_rfdset);
break;
case FDPOLL_MODE_WRITE:
FD_SET (fd, &fdp->master_wfdset);
break;
default:
break;
}
if (fd > fdp->maxfd) {
fdp->maxfd = fd;
}
fdp->select_fdidx[fd] = nfd->npollfds;
fdp->fd_rw[fd] = rw;
nfd->npollfds++;
return ret_ok;
}
static ret_t
_del (cherokee_fdpoll_select_t *fdp, int fd)
{
cherokee_fdpoll_t *nfd = FDPOLL(fdp);
int idx = fdp->select_fdidx[fd];
if ((idx < 0) || (idx >= FDPOLL(fdp)->nfiles)) {
PRINT_ERROR ("Bad idx (%d) in select_del_fd!\n", idx);
return ret_error;
}
nfd->npollfds--;
fdp->select_fds[idx] = fdp->select_fds[nfd->npollfds];
fdp->select_fdidx[fdp->select_fds[idx]] = idx;
fdp->select_fds[nfd->npollfds] = -1;
fdp->select_fdidx[fd] = -1;
fdp->fd_rw[fd] = -1;
FD_CLR (fd, &fdp->master_rfdset);
FD_CLR (fd, &fdp->master_wfdset);
if (fd >= fdp->maxfd) {
fdp->maxfd_recompute = 1;
}
return ret_ok;
}
static ret_t
_set_mode (cherokee_fdpoll_select_t *fdp, int fd, int rw)
{
ret_t ret;
ret = _del (fdp, fd);
if (unlikely(ret < ret_ok))
return ret;
return _add (fdp, fd, rw);
}
static int
_check (cherokee_fdpoll_select_t *fdp, int fd, int rw)
{
UNUSED(rw);
switch (fdp->fd_rw[fd]) {
case FDPOLL_MODE_READ:
return FD_ISSET (fd, &fdp->working_rfdset);
case FDPOLL_MODE_WRITE:
return FD_ISSET (fd, &fdp->working_wfdset);
}
return 0;
}
static int
select_get_maxfd (cherokee_fdpoll_select_t *fdp)
{
if (fdp->maxfd_recompute) {
int i;
fdp->maxfd = -1;
for (i = 0; i < FDPOLL(fdp)->npollfds; ++i) {
if (fdp->select_fds[i] > fdp->maxfd ) {
fdp->maxfd = fdp->select_fds[i];
}
}
fdp->maxfd_recompute = 0;
}
return fdp->maxfd;
}
static int
_watch (cherokee_fdpoll_select_t *fdp, int timeout_msecs)
{
int mfd;
int r, idx, ridx;
fdp->working_rfdset = fdp->master_rfdset;
fdp->working_wfdset = fdp->master_wfdset;
mfd = select_get_maxfd(fdp);
if (timeout_msecs == INFTIM) {
r = select (mfd + 1, &fdp->working_rfdset, &fdp->working_wfdset, NULL, NULL);
} else {
struct timeval timeout;
timeout.tv_sec = timeout_msecs / 1000L;
timeout.tv_usec = ( timeout_msecs % 1000L ) * 1000L;
r = select (mfd + 1, &fdp->working_rfdset, &fdp->working_wfdset, NULL, &timeout);
}
if (r <= 0) {
return r;
}
ridx = 0;
for (idx = 0; idx < FDPOLL(fdp)->npollfds; ++idx) {
if (_check (fdp, fdp->select_fds[idx], 0)) {
fdp->select_rfdidx[ridx++] = fdp->select_fds[idx];
if (ridx == r)
break;
}
}
return ridx; /* should be equal to r */
}
static ret_t
_reset (cherokee_fdpoll_select_t *fdp, int fd)
{
UNUSED(fdp);
UNUSED(fd);
return ret_ok;
}
ret_t
fdpoll_select_get_fdlimits (cuint_t *system_fd_limit, cuint_t *fd_limit)
{
*system_fd_limit = FD_SETSIZE;
*fd_limit = 0;
return ret_ok;
}
ret_t
fdpoll_select_new (cherokee_fdpoll_t **fdp, int system_fd_limit, int fd_limit)
{
int i;
cherokee_fdpoll_t *nfd;
CHEROKEE_CNEW_STRUCT (1, n, fdpoll_select);
/* Verify that the max. number of system fds
* is below the max. acceptable limit.
*/
if (system_fd_limit > FD_SETSIZE) {
_free(n);
return ret_error;
}
nfd = FDPOLL(n);
/* Init base class properties
*/
nfd->type = cherokee_poll_select;
nfd->nfiles = fd_limit;
nfd->system_nfiles = system_fd_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;
/* Init properties
*/
FD_ZERO (&n->master_rfdset);
FD_ZERO (&n->master_wfdset);
n->select_fds = (int*) calloc(nfd->nfiles, sizeof(int));
n->select_rfdidx = (int*) calloc(nfd->nfiles, sizeof(int));
n->select_fdidx = (int*) calloc(nfd->system_nfiles, sizeof(int));
n->fd_rw = (int*) calloc(nfd->system_nfiles, sizeof(int));
n->maxfd = -1;
n->maxfd_recompute = 0;
if (n->select_fds == NULL ||
n->select_rfdidx == NULL ||
n->select_fdidx == NULL ||
n->fd_rw == NULL) {
_free (n);
return ret_nomem;
}
for (i = 0; i < nfd->nfiles; ++i) {
n->select_fds[i] = -1;
}
for (i = 0; i < nfd->system_nfiles; ++i) {
n->select_fdidx[i] = -1;
n->fd_rw[i] = -1;
}
*fdp = nfd;
return ret_ok;
}
Jump to Line
Something went wrong with that request. Please try again.