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add new IO layer
This commit is contained in:
Florian Westphal
parent
ebbf92898e
commit
7eca418465
611
src/ngircd/io.c
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611
src/ngircd/io.c
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@ -0,0 +1,611 @@
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* Please read the file COPYING, README and AUTHORS for more information.
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*
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* I/O abstraction interface.
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* Copyright (c) 2005 Florian Westphal (westphal@foo.fh-furtwangen.de)
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*
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*/
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#include "portab.h"
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static char UNUSED id[] = "$Id: io.c,v 1.1 2005/07/07 18:38:35 fw Exp $";
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "array.h"
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#include "io.h"
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#include "log.h"
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typedef struct {
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void (*callback)(int, short);
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int fd;
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short what;
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} io_event;
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#define INIT_IOEVENT { NULL, -1, 0, NULL }
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#define IO_ERROR 4
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#ifdef HAVE_EPOLL_CREATE
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#define IO_USE_EPOLL 1
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#else
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# ifdef HAVE_KQUEUE
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#define IO_USE_KQUEUE 1
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# else
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#define IO_USE_SELECT 1
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#endif
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#endif
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#ifdef IO_USE_EPOLL
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#include <sys/epoll.h>
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static int io_masterfd;
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static bool io_event_new_epoll(int fd, short what);
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static bool io_event_change_epoll(int fd, short what);
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static int io_dispatch_epoll(struct timeval *tv);
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#endif
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#ifdef IO_USE_KQUEUE
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#include <sys/types.h>
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#include <sys/event.h>
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static array io_evcache;
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static int io_masterfd;
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static int io_dispatch_kqueue(struct timeval *tv);
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static bool io_event_add_kqueue(int, short);
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#endif
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#ifdef IO_USE_SELECT
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#include "defines.h" /* for conn.h */
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#include "conn.h" /* for CONN_IDX (needed by resolve.h) */
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#include "resolve.h" /* for RES_STAT (needed by conf.h) */
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#include "conf.h" /* for Conf_MaxConnections */
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static fd_set readers;
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static fd_set writers;
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static int select_maxfd; /* the select() interface sucks badly */
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static int io_dispatch_select(struct timeval *tv);
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#endif
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static array io_events;
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static void io_docallback PARAMS((int fd, short what));
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static io_event *
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io_event_get(int fd)
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{
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io_event *i;
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assert(fd >= 0);
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i = (io_event *) array_get(&io_events, sizeof(io_event), fd);
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assert(i);
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if (!i) {
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#ifdef DEBUG
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Log(LOG_DEBUG, "io_event_add(): EMPTY FOR fd %d", fd);
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#endif
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return NULL;
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}
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return i;
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}
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bool
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io_library_init(unsigned int eventsize)
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{
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#ifdef IO_USE_EPOLL
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int ecreate_hint = (int)eventsize;
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if (ecreate_hint <= 0)
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ecreate_hint = 128;
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#endif
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#ifdef IO_USE_SELECT
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#ifdef FD_SETSIZE
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if (eventsize >= FD_SETSIZE)
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eventsize = FD_SETSIZE - 1;
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#endif
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#endif
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if (eventsize && !array_alloc(&io_events, sizeof(io_event), eventsize))
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eventsize = 0;
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#ifdef IO_USE_EPOLL
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io_masterfd = epoll_create(ecreate_hint);
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Log(LOG_INFO,
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"io subsystem: using epoll (hint size %d), initial io_event maxfd: %u, io_masterfd %d",
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ecreate_hint, eventsize, io_masterfd);
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return io_masterfd >= 0;
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#endif
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#ifdef IO_USE_SELECT
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Log(LOG_INFO, "io subsystem: using select, initial io_event maxfd: %u",
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eventsize);
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FD_ZERO(&readers);
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FD_ZERO(&writers);
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#ifdef FD_SETSIZE
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if (Conf_MaxConnections >= FD_SETSIZE) {
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Log(LOG_WARNING,
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"Conf_MaxConnections (%d) exceeds limit (%u), changed Conf_MaxConnections to %u",
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Conf_MaxConnections, FD_SETSIZE, FD_SETSIZE - 1);
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Conf_MaxConnections = FD_SETSIZE - 1;
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}
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#else
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Log(LOG_WARNING,
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"FD_SETSIZE undefined, don't know how many descriptors select() can handle on your platform");
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#endif
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return true;
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#endif
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#ifdef IO_USE_KQUEUE
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io_masterfd = kqueue();
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Log(LOG_INFO,
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"io subsystem: using kqueue, initial io_event maxfd: %u, io_masterfd %d",
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eventsize, io_masterfd);
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return io_masterfd >= 0;
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#endif
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}
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bool
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io_library_shutdown(void)
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{
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unsigned int len = array_length(&io_events, sizeof(io_event));
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while (len--) {
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if (NULL == io_event_get(len))
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continue;
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}
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#ifndef IO_USE_SELECT
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close(io_masterfd); /* kqueue, epoll */
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io_masterfd = -1;
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#else
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FD_ZERO(&readers);
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FD_ZERO(&writers);
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#endif
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#ifdef IO_USE_KQUEUE
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array_free(&io_evcache);
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#endif
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return true;
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}
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bool
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io_event_setcb(int fd, void (*cbfunc) (int, short))
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{
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io_event *i = io_event_get(fd);
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if (!i)
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return false;
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i->callback = cbfunc;
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return true;
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}
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bool
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io_event_create(int fd, short what, void (*cbfunc) (int, short))
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{
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io_event *i;
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assert(fd >= 0);
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#ifdef IO_USE_SELECT
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#ifdef FD_SETSIZE
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if (fd >= FD_SETSIZE) {
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Log(LOG_ERR,
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"fd %d exceeds FD_SETSIZE (%u) (select can't handle more file descriptors)",
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fd, FD_SETSIZE);
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return false;
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}
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#endif /* FD_SETSIZE */
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#endif /* IO_USE_SELECT */
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i = (io_event *) array_alloc(&io_events, sizeof(io_event), fd);
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if (!i) {
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Log(LOG_WARNING,
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"array_alloc failed: could not allocate space for %d io_event structures",
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fd);
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return false;
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}
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i->fd = fd;
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i->callback = cbfunc;
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#ifdef IO_USE_EPOLL
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i->what = what;
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return io_event_new_epoll(fd, what);
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#endif
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#ifdef IO_USE_KQUEUE
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i->what = what;
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return io_event_add_kqueue(fd, what);
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#endif
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#ifdef IO_USE_SELECT
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i->what = 0;
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return io_event_add(fd, what);
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#endif
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}
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#ifdef IO_USE_EPOLL
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static bool
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io_event_new_epoll(int fd, short what)
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{
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struct epoll_event ev = { 0, {0} };
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ev.data.fd = fd;
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if (what & IO_WANTREAD)
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ev.events = EPOLLIN | EPOLLPRI;
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if (what & IO_WANTWRITE)
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ev.events |= EPOLLOUT;
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return epoll_ctl(io_masterfd, EPOLL_CTL_ADD, fd, &ev) == 0;
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}
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static bool
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io_event_change_epoll(int fd, short what)
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{
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struct epoll_event ev = { 0, {0} };
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ev.data.fd = fd;
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if (what & IO_WANTREAD)
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ev.events = EPOLLIN | EPOLLPRI;
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if (what & IO_WANTWRITE)
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ev.events |= EPOLLOUT;
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return epoll_ctl(io_masterfd, EPOLL_CTL_MOD, fd, &ev) == 0;
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}
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#endif
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#ifdef IO_USE_KQUEUE
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static bool
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io_event_kqueue_commit_cache(void)
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{
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struct kevent *events;
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bool ret;
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int len = (int) array_length(&io_evcache, sizeof (struct kevent));
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if (!len) /* nothing to do */
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return true;
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assert(len>0);
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if (len < 0) {
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array_free(&io_evcache);
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return false;
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}
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events = array_start(&io_evcache);
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assert(events);
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ret = kevent(io_masterfd, events, len, NULL, 0, NULL) == 0;
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if (ret)
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array_trunc(&io_evcache);
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return ret;
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}
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static bool
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io_event_add_kqueue(int fd, short what)
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{
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struct kevent kev;
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short filter = 0;
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unsigned int len = array_length(&io_evcache, sizeof kev);
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bool ret;
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if (what & IO_WANTREAD)
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filter = EVFILT_READ;
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if (what & IO_WANTWRITE)
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filter |= EVFILT_WRITE;
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if (len >= 100) {
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ret = io_event_kqueue_commit_cache();
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if (ret)
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array_trunc(&io_evcache);
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}
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EV_SET(&kev, fd, filter, EV_ADD | EV_ENABLE, 0, 0, NULL);
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return array_catb(&io_evcache, (char*) &kev, sizeof (kev));
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}
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#endif
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bool
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io_event_add(int fd, short what)
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{
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io_event *i = io_event_get(fd);
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assert(i);
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if (!i)
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return false;
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if (i->what == what)
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return true;
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#ifdef DEBUG
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Log(LOG_DEBUG, "io_event_add(): fd %d (arg: %d), what %d.", i->fd, fd,
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what);
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#endif
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i->what |= what;
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#ifdef IO_USE_EPOLL
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return io_event_change_epoll(fd, i->what);
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#endif
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#ifdef IO_USE_KQUEUE
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return io_event_add_kqueue(fd, what);
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#endif
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#ifdef IO_USE_SELECT
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if (fd > select_maxfd)
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select_maxfd = fd;
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if (what & IO_WANTREAD)
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FD_SET(fd, &readers);
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if (what & IO_WANTWRITE)
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FD_SET(fd, &writers);
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return true;
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#endif
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}
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bool
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io_setnonblock(int fd)
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{
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int flags = fcntl(fd, F_GETFL);
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if (flags == -1)
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return false;
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#ifndef O_NONBLOCK
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#define O_NONBLOCK O_NDELAY
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#endif
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flags |= O_NONBLOCK;
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return fcntl(fd, F_SETFL, flags) == 0;
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}
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bool
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io_close(int fd)
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{
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io_event *i = io_event_get(fd);
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if (i) {
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memset(i, 0, sizeof(io_event));
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i->fd = -1;
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}
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#ifdef IO_USE_SELECT
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FD_CLR(fd, &writers);
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FD_CLR(fd, &readers);
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if (fd == select_maxfd)
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select_maxfd--;
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#endif
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#ifdef IO_USE_KQUEUE
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if (array_length(&io_evcache, sizeof (struct kevent))) /* pending data in cache? */
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io_event_kqueue_commit_cache();
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#endif
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return close(fd) == 0; /* both epoll an kqueue will remove fd from all sets automatically */
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}
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bool
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io_event_del(int fd, short what)
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{
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#ifdef IO_USE_KQUEUE
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struct kevent kev;
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short filter = 0;
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#endif
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io_event *i = io_event_get(fd);
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#ifdef DEBUG
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Log(LOG_DEBUG, "io_event_del(): trying to delete eventtype %d on fd %d",
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what, fd);
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#endif
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assert(i);
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if (!i)
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return true;
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i->what &= ~what;
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#ifdef IO_USE_EPOLL
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return io_event_change_epoll(fd, i->what);
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#endif
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#ifdef IO_USE_KQUEUE
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if (what & IO_WANTREAD)
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filter = EVFILT_READ;
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if (what & IO_WANTWRITE)
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filter |= EVFILT_WRITE;
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EV_SET(&kev, fd, filter, EV_DELETE, 0, 0, NULL);
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return kevent(io_masterfd, &kev, 1, NULL, 0, NULL) == 0;
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#endif
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#ifdef IO_USE_SELECT
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if (what & IO_WANTWRITE)
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FD_CLR(i->fd, &writers);
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if (what & IO_WANTREAD)
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FD_CLR(i->fd, &readers);
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return true;
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#endif
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}
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#ifdef IO_USE_SELECT
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static int
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io_dispatch_select(struct timeval *tv)
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{
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fd_set readers_tmp = readers;
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fd_set writers_tmp = writers;
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short what;
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int ret, i;
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int fds_ready;
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ret = select(select_maxfd + 1, &readers_tmp, &writers_tmp, NULL, tv);
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if (ret <= 0)
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return ret;
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fds_ready = ret;
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for (i = 0; i <= select_maxfd; i++) {
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what = 0;
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if (FD_ISSET(i, &readers_tmp)) {
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what = IO_WANTREAD;
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fds_ready--;
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}
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if (FD_ISSET(i, &writers_tmp)) {
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what |= IO_WANTWRITE;
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fds_ready--;
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}
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if (what)
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io_docallback(i, what);
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if (fds_ready <= 0)
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break;
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}
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return ret;
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}
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#endif
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#ifdef IO_USE_EPOLL
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static int
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io_dispatch_epoll(struct timeval *tv)
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{
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time_t sec = tv->tv_sec * 1000;
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int i, total = 0, ret, timeout = tv->tv_usec + sec;
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struct epoll_event epoll_ev[100];
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short type;
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if (timeout < 0)
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timeout = 1000;
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do {
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ret = epoll_wait(io_masterfd, epoll_ev, 100, timeout);
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total += ret;
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if (ret <= 0)
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return total;
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for (i = 0; i < ret; i++) {
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type = 0;
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if (epoll_ev[i].events & (EPOLLERR | EPOLLHUP))
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type = IO_ERROR;
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if (epoll_ev[i].events & (EPOLLIN | EPOLLPRI))
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type |= IO_WANTREAD;
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if (epoll_ev[i].events & EPOLLOUT)
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type |= IO_WANTWRITE;
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io_docallback(epoll_ev[i].data.fd, type);
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}
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timeout = 0;
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} while (ret == 100);
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return total;
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}
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#endif
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#ifdef IO_USE_KQUEUE
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static int
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io_dispatch_kqueue(struct timeval *tv)
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{
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int i, total = 0, ret;
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struct kevent kev[100];
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struct kevents *newevents;
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struct timespec ts;
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int newevents_len;
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short type;
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ts.tv_sec = tv->tv_sec;
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ts.tv_nsec = tv->tv_usec * 1000;
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do {
|
||||
newevents_len = array_length(&io_evcache, sizeof (struct kevent));
|
||||
newevents = (newevents_len > 0) ? array_start(&io_evcache) : NULL;
|
||||
assert(newevents_len >= 0);
|
||||
if (newevents_len < 0)
|
||||
newevents_len = 0;
|
||||
#ifdef DEBUG
|
||||
if (newevents_len)
|
||||
assert(newevents);
|
||||
#endif
|
||||
|
||||
ret = kevent(io_masterfd, newevents, newevents_len, kev, 100, &ts);
|
||||
if ((newevents_len>0) && ret != -1)
|
||||
array_trunc(&io_evcache);
|
||||
|
||||
total += ret;
|
||||
if (ret <= 0)
|
||||
return total;
|
||||
|
||||
for (i = 0; i < ret; i++) {
|
||||
type = 0;
|
||||
if (kev[i].flags & EV_EOF)
|
||||
type = IO_ERROR;
|
||||
|
||||
if (kev[i].filter & EV_ERROR)
|
||||
type = IO_ERROR;
|
||||
|
||||
if (kev[i].filter & EVFILT_READ)
|
||||
type |= IO_WANTREAD;
|
||||
|
||||
if (kev[i].filter & EVFILT_WRITE)
|
||||
type |= IO_WANTWRITE;
|
||||
|
||||
io_docallback(kev[i].ident, type);
|
||||
}
|
||||
|
||||
ts.tv_sec = 0;
|
||||
ts.tv_nsec = 0;
|
||||
|
||||
} while (ret == 100);
|
||||
|
||||
return total;
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
int
|
||||
io_dispatch(struct timeval *tv)
|
||||
{
|
||||
#ifdef IO_USE_SELECT
|
||||
return io_dispatch_select(tv);
|
||||
#endif
|
||||
#ifdef IO_USE_KQUEUE
|
||||
return io_dispatch_kqueue(tv);
|
||||
#endif
|
||||
#ifdef IO_USE_EPOLL
|
||||
return io_dispatch_epoll(tv);
|
||||
#endif
|
||||
}
|
||||
|
||||
|
||||
/* call the callback function inside the struct matching fd */
|
||||
static void
|
||||
io_docallback(int fd, short what)
|
||||
{
|
||||
io_event *i;
|
||||
#ifdef DEBUG
|
||||
Log(LOG_DEBUG, "doing callback for fd %d, what %d", fd, what);
|
||||
#endif
|
||||
i = io_event_get(fd);
|
||||
assert(i);
|
||||
|
||||
if (i->callback) /* callback might be 0 if previous callback function called io_close on this fd */
|
||||
i->callback(fd, (what & IO_ERROR) ? i->what : what);
|
||||
/* if error indicator is set, we return the event(s) the app asked for */
|
||||
}
|
||||
50
src/ngircd/io.h
Normal file
50
src/ngircd/io.h
Normal file
@ -0,0 +1,50 @@
|
||||
/*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
* Please read the file COPYING, README and AUTHORS for more information.
|
||||
*
|
||||
* I/O abstraction interface header
|
||||
*
|
||||
* $Id: io.h,v 1.1 2005/07/07 18:38:35 fw Exp $
|
||||
*/
|
||||
|
||||
#ifndef io_H_inclucded
|
||||
#define io_H_included
|
||||
|
||||
#include "portab.h"
|
||||
#include <sys/time.h>
|
||||
|
||||
#define IO_WANTREAD 1
|
||||
#define IO_WANTWRITE 2
|
||||
|
||||
/* init library. sets up epoll/kqueue descriptors and tries to allocate space for ioevlen file descriptors.
|
||||
ioevlen is just the _initial_ size, not a limit. */
|
||||
bool io_library_init PARAMS((unsigned int ioevlen));
|
||||
|
||||
/* shutdown and free all internal data structures */
|
||||
bool io_library_shutdown PARAMS((void));
|
||||
|
||||
/* add fd to internal set, enable readability check, set callback */
|
||||
bool io_event_create PARAMS((int fd, short what, void (*cbfunc)(int, short)));
|
||||
|
||||
/* change callback function associated with fd */
|
||||
bool io_event_setcb PARAMS((int fd, void (*cbfunc)(int, short)));
|
||||
|
||||
/* watch fd for event of type what */
|
||||
bool io_event_add PARAMS((int fd, short what));
|
||||
|
||||
/* do not watch fd for event of type what */
|
||||
bool io_event_del PARAMS((int fd, short what));
|
||||
|
||||
/* remove fd from watchlist, close() fd. */
|
||||
bool io_close PARAMS((int fd));
|
||||
|
||||
/* set O_NONBLOCK */
|
||||
bool io_setnonblock PARAMS((int fd));
|
||||
|
||||
/* watch fds for activity */
|
||||
int io_dispatch PARAMS((struct timeval *tv));
|
||||
|
||||
#endif /* io_H_included */
|
||||
Loading…
Reference in New Issue
Block a user