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/*
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* Abstraction API/layer for the various ways PvPGN can inspect sockets state
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* 2003 (C) dizzy@roedu.net
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*
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* Code is based on the ideas found in thttpd project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "common/setup_before.h"
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#ifdef HAVE_STRING_H
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# include <string.h>
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#else
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# ifdef HAVE_STRINGS_H
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# include <strings.h>
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# endif
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#endif
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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#else
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# ifdef HAVE_MALLOC_H
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# include <malloc.h>
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# endif
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#endif
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#include "common/eventlog.h"
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#define FDWATCH_BACKEND
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#include "fdwatch.h"
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#ifdef HAVE_SELECT
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#include "fdwatch_select.h"
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#endif
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#ifdef HAVE_POLL
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#include "fdwatch_poll.h"
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#endif
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#ifdef HAVE_KQUEUE
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#include "fdwatch_kqueue.h"
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#endif
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#ifdef HAVE_EPOLL
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#include "fdwatch_epoll.h"
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#endif
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#include "common/rlimit.h"
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#include "common/xalloc.h"
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#include "common/setup_after.h"
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int fdw_maxcons;
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t_fdwatch_fd *fdw_fds = NULL;
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static t_fdw_backend * fdw = NULL;
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static DECLARE_ELIST_INIT(freelist);
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static DECLARE_ELIST_INIT(uselist);
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extern int fdwatch_init(int maxcons)
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{
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int i, maxsys;
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maxsys = get_socket_limit();
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if (maxsys > 0) maxcons = (maxcons < maxsys) ? maxcons : maxsys;
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if (maxcons < 32) {
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eventlog(eventlog_level_fatal, __FUNCTION__, "too few sockets available (%d)",maxcons);
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return -1;
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}
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fdw_maxcons = maxcons;
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fdw_fds = xmalloc(sizeof(t_fdwatch_fd) * fdw_maxcons);
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memset(fdw_fds, 0, sizeof(t_fdwatch_fd) * fdw_maxcons);
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/* add all slots to the freelist */
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for(i = 0; i < fdw_maxcons; i++)
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elist_add_tail(&freelist,&(fdw_fds[i].freelist));
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#ifdef HAVE_EPOLL
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fdw = &fdw_epoll;
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if (!fdw->init(fdw_maxcons)) goto ok;
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#endif
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#ifdef HAVE_KQUEUE
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fdw = &fdw_kqueue;
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if (!fdw->init(fdw_maxcons)) goto ok;
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#endif
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#ifdef HAVE_POLL
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fdw = &fdw_poll;
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if (!fdw->init(fdw_maxcons)) goto ok;
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goto ok;
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#endif
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#ifdef HAVE_SELECT
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fdw = &fdw_select;
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if (!fdw->init(fdw_maxcons)) goto ok;
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#endif
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eventlog(eventlog_level_fatal, __FUNCTION__, "Found no working fdwatch layer");
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fdw = NULL;
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fdwatch_close();
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return -1;
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ok:
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return 0;
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}
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extern int fdwatch_close(void)
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{
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if (fdw) { fdw->close(); fdw = NULL; }
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if (fdw_fds) { xfree((void*)fdw_fds); fdw_fds = NULL; }
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elist_init(&freelist);
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elist_init(&uselist);
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return 0;
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}
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extern int fdwatch_add_fd(int fd, t_fdwatch_type rw, fdwatch_handler h, void *data)
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{
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t_fdwatch_fd *cfd;
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if (elist_empty(&freelist)) return -1; /* max sockets reached */
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cfd = elist_entry(elist_next(&freelist),t_fdwatch_fd,freelist);
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fdw_fd(cfd) = fd;
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if (fdw->add_fd(fdw_idx(cfd), rw)) return -1;
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/* add it to used sockets list, remove it from free list */
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elist_add_tail(&uselist,&cfd->uselist);
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elist_del(&cfd->freelist);
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fdw_rw(cfd) = rw;
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fdw_data(cfd) = data;
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fdw_hnd(cfd) = h;
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return fdw_idx(cfd);
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}
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extern int fdwatch_update_fd(int idx, t_fdwatch_type rw)
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{
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if (idx<0 || idx>=fdw_maxcons) {
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eventlog(eventlog_level_error,__FUNCTION__,"out of bounds idx [%d] (max: %d)",idx, fdw_maxcons);
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return -1;
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}
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/* do not allow completly reset the access because then backend codes
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* can get confused */
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if (!rw) {
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eventlog(eventlog_level_error,__FUNCTION__,"tried to reset rw, not allowed");
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return -1;
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}
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if (!fdw_rw(fdw_fds + idx)) {
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eventlog(eventlog_level_error,__FUNCTION__,"found reseted rw");
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return -1;
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}
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if (fdw->add_fd(idx, rw)) return -1;
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fdw_rw(&fdw_fds[idx]) = rw;
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return 0;
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}
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extern int fdwatch_del_fd(int idx)
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{
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t_fdwatch_fd *cfd;
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if (idx<0 || idx>=fdw_maxcons) {
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eventlog(eventlog_level_error,__FUNCTION__,"out of bounds idx [%d] (max: %d)",idx, fdw_maxcons);
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return -1;
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}
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cfd = fdw_fds + idx;
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if (!fdw_rw(cfd)) {
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eventlog(eventlog_level_error,__FUNCTION__,"found reseted rw");
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return -1;
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}
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fdw->del_fd(idx);
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/* remove it from uselist, add it to freelist */
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elist_del(&cfd->uselist);
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elist_add_tail(&freelist,&cfd->freelist);
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fdw_fd(cfd) = 0;
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fdw_rw(cfd) = 0;
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fdw_data(cfd) = NULL;
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fdw_hnd(cfd) = NULL;
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return 0;
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}
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extern int fdwatch(long timeout_msec)
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{
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return fdw->watch(timeout_msec);
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}
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extern void fdwatch_handle(void)
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{
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fdw->handle();
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}
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extern void fdwatch_traverse(t_fdw_cb cb, void *data)
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{
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t_elist *curr;
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elist_for_each(curr,&uselist)
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{
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if (cb(elist_entry(curr,t_fdwatch_fd,uselist),data)) break;
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}
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}
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