895 lines
18 KiB
C
895 lines
18 KiB
C
/*
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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 1.31 2008/04/03 20:56:44 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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/* Enables extra debug messages in event add/delete/callback code. */
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/* #define DEBUG_IO */
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typedef struct {
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#ifdef PROTOTYPES
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void (*callback)(int, short);
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#else
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void (*callback)();
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#endif
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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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# ifdef HAVE_SELECT
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# define IO_USE_SELECT 1
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# endif
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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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# ifdef HAVE_SYS_DEVPOLL_H
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# define IO_USE_DEVPOLL 1
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# else
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# ifdef HAVE_POLL
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# define IO_USE_POLL 1
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# else
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# ifdef HAVE_SELECT
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# define IO_USE_SELECT 1
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# else
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# error "no IO API available!?"
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# endif /* HAVE_SELECT */
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# endif /* HAVE_POLL */
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# endif /* HAVE_SYS_DEVPOLL_H */
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# endif /* HAVE_KQUEUE */
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#endif /* HAVE_EPOLL_CREATE */
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static bool library_initialized = false;
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#ifdef IO_USE_EPOLL
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#include <sys/epoll.h>
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static int io_masterfd = -1;
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static bool io_event_change_epoll(int fd, short what, const int action);
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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_change_kqueue(int, short, const int action);
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#endif
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#ifdef IO_USE_POLL
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#include <poll.h>
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static array pollfds;
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static int poll_maxfd;
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static bool io_event_change_poll PARAMS((int fd, short what));
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#endif
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#ifdef IO_USE_DEVPOLL
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#include <sys/devpoll.h>
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static int io_masterfd;
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static bool io_event_change_devpoll(int fd, short what);
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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 "proc.h" /* for PROC_STAT (needed by conf.h) */
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#include "conn.h" /* for CONN_ID (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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/*
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* this is the first argument for select(), i.e.
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* the largest fd registered, plus one.
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*/
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static int select_maxfd;
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static int io_dispatch_select(struct timeval *tv);
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#ifndef IO_USE_EPOLL
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#define io_masterfd -1
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#endif
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#endif /* IO_USE_SELECT */
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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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#ifdef DEBUG_IO
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static void io_debug(const char *s, int fd, int what)
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{
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Log(LOG_DEBUG, "%s: %d, %d\n", s, fd, what);
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}
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#else
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static inline void io_debug(const char UNUSED *s,int UNUSED a, int UNUSED b) {/*NOTHING*/}
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#endif
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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), (size_t) fd);
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assert(i != NULL);
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return i;
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}
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#ifdef IO_USE_DEVPOLL
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static int
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io_dispatch_devpoll(struct timeval *tv)
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{
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struct dvpoll dvp;
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time_t sec = tv->tv_sec * 1000;
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int i, total, ret, timeout = tv->tv_usec + sec;
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short what;
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struct pollfd p[100];
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if (timeout < 0)
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timeout = 1000;
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total = 0;
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do {
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dvp.dp_timeout = timeout;
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dvp.dp_nfds = 100;
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dvp.dp_fds = p;
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ret = ioctl(io_masterfd, DP_POLL, &dvp);
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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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what = 0;
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if (p[i].revents & (POLLIN|POLLPRI))
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what = IO_WANTREAD;
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if (p[i].revents & POLLOUT)
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what |= IO_WANTWRITE;
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if (p[i].revents && !what) {
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/* other flag is set, probably POLLERR */
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what = IO_ERROR;
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}
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io_docallback(p[i].fd, what);
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}
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} while (ret == 100);
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return total;
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}
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static bool
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io_event_change_devpoll(int fd, short what)
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{
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struct pollfd p;
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p.events = 0;
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if (what & IO_WANTREAD)
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p.events = POLLIN | POLLPRI;
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if (what & IO_WANTWRITE)
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p.events |= POLLOUT;
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p.fd = fd;
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return write(io_masterfd, &p, sizeof p) == (ssize_t)sizeof p;
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}
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static void
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io_close_devpoll(int fd)
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{
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struct pollfd p;
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p.events = POLLREMOVE;
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p.fd = fd;
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write(io_masterfd, &p, sizeof p);
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}
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static void
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io_library_init_devpoll(unsigned int eventsize)
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{
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io_masterfd = open("/dev/poll", O_RDWR);
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if (io_masterfd >= 0)
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library_initialized = true;
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Log(LOG_INFO, "IO subsystem: /dev/poll (initial maxfd %u, masterfd %d).",
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eventsize, io_masterfd);
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}
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#else
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static inline void io_close_devpoll(int UNUSED x) {/* NOTHING */}
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static inline void io_library_init_devpoll(unsigned int UNUSED ev) {/*NOTHING*/}
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#endif
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#ifdef IO_USE_POLL
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static int
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io_dispatch_poll(struct timeval *tv)
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{
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time_t sec = tv->tv_sec * 1000;
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int i, ret, timeout = tv->tv_usec + sec;
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int fds_ready;
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short what;
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struct pollfd *p = array_start(&pollfds);
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if (timeout < 0)
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timeout = 1000;
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ret = poll(p, poll_maxfd + 1, timeout);
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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 <= poll_maxfd; i++) {
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what = 0;
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if (p[i].revents & (POLLIN|POLLPRI))
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what = IO_WANTREAD;
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if (p[i].revents & POLLOUT)
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what |= IO_WANTWRITE;
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if (p[i].revents && !what) {
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/* other flag is set, probably POLLERR */
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what = IO_ERROR;
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}
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if (what) {
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fds_ready--;
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io_docallback(i, what);
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}
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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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static bool
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io_event_change_poll(int fd, short what)
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{
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struct pollfd *p;
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short events = 0;
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if (what & IO_WANTREAD)
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events = POLLIN | POLLPRI;
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if (what & IO_WANTWRITE)
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events |= POLLOUT;
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p = array_alloc(&pollfds, sizeof *p, fd);
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if (p) {
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p->events = events;
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p->fd = fd;
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if (fd > poll_maxfd)
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poll_maxfd = fd;
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}
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return p != NULL;
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}
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static void
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io_close_poll(int fd)
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{
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struct pollfd *p;
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p = array_get(&pollfds, sizeof *p, fd);
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if (!p) return;
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p->fd = -1;
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if (fd == poll_maxfd) {
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while (poll_maxfd > 0) {
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--poll_maxfd;
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p = array_get(&pollfds, sizeof *p, poll_maxfd);
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if (p && p->fd >= 0)
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break;
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}
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}
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}
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static void
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io_library_init_poll(unsigned int eventsize)
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{
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struct pollfd *p;
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array_init(&pollfds);
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poll_maxfd = 0;
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Log(LOG_INFO, "IO subsystem: poll (initial maxfd %u).",
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eventsize);
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p = array_alloc(&pollfds, sizeof(struct pollfd), eventsize);
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if (p) {
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unsigned i;
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p = array_start(&pollfds);
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for (i = 0; i < eventsize; i++)
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p[i].fd = -1;
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library_initialized = true;
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}
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}
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#else
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static inline void io_close_poll(int UNUSED x) {/* NOTHING */}
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static inline void io_library_init_poll(unsigned int UNUSED ev) {/*NOTHING*/}
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#endif
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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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static void
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io_library_init_select(unsigned int eventsize)
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{
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if (library_initialized)
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return;
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Log(LOG_INFO, "IO subsystem: select (initial 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 >= (int)FD_SETSIZE) {
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Log(LOG_WARNING,
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"MaxConnections (%d) exceeds limit (%u), changed 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 /* FD_SETSIZE */
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library_initialized = true;
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}
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static void
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io_close_select(int fd)
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{
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io_event *i;
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if (io_masterfd >= 0) /* Are we using epoll()? */
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return;
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FD_CLR(fd, &writers);
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FD_CLR(fd, &readers);
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i = io_event_get(fd);
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if (!i) return;
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if (fd == select_maxfd) {
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while (select_maxfd>0) {
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--select_maxfd; /* find largest fd */
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i = io_event_get(select_maxfd);
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if (i && i->callback) break;
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}
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}
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}
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#else
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static inline void io_library_init_select(int UNUSED x) {/* NOTHING */}
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static inline void io_close_select(int UNUSED x) {/* NOTHING */}
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#endif /* SELECT */
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#ifdef IO_USE_EPOLL
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static bool
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io_event_change_epoll(int fd, short what, const int action)
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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, action, fd, &ev) == 0;
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}
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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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static void
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io_library_init_epoll(unsigned int eventsize)
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{
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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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io_masterfd = epoll_create(ecreate_hint);
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if (io_masterfd >= 0) {
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library_initialized = true;
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Log(LOG_INFO,
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"IO subsystem: epoll (hint size %d, initial maxfd %u, masterfd %d).",
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ecreate_hint, eventsize, io_masterfd);
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return;
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}
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#ifdef IO_USE_SELECT
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Log(LOG_INFO, "Can't initialize epoll() IO interface, falling back to select() ...");
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#endif
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}
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#else
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static inline void io_library_init_epoll(unsigned int UNUSED ev) {/* NOTHING */}
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#endif /* IO_USE_EPOLL */
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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 != NULL);
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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_change_kqueue(int fd, short what, const int action)
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{
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struct kevent kev;
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bool ret = true;
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if (what & IO_WANTREAD) {
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EV_SET(&kev, fd, EVFILT_READ, action, 0, 0, 0);
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ret = array_catb(&io_evcache, (char*) &kev, sizeof (kev));
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if (!ret)
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ret = kevent(io_masterfd, &kev,1, NULL, 0, NULL) == 0;
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}
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if (ret && (what & IO_WANTWRITE)) {
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EV_SET(&kev, fd, EVFILT_WRITE, action, 0, 0, 0);
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ret = array_catb(&io_evcache, (char*) &kev, sizeof (kev));
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if (!ret)
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ret = kevent(io_masterfd, &kev, 1, NULL, 0, NULL) == 0;
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}
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if (array_length(&io_evcache, sizeof kev) >= 100)
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io_event_kqueue_commit_cache();
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return ret;
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}
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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 kevent *newevents;
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struct timespec ts;
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int newevents_len;
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ts.tv_sec = tv->tv_sec;
|
|
ts.tv_nsec = tv->tv_usec * 1000;
|
|
|
|
do {
|
|
newevents_len = (int) array_length(&io_evcache, sizeof (struct kevent));
|
|
newevents = (newevents_len > 0) ? array_start(&io_evcache) : NULL;
|
|
assert(newevents_len >= 0);
|
|
|
|
ret = kevent(io_masterfd, newevents, newevents_len, kev, 100, &ts);
|
|
if (newevents && ret != -1)
|
|
array_trunc(&io_evcache);
|
|
|
|
total += ret;
|
|
if (ret <= 0)
|
|
return total;
|
|
|
|
for (i = 0; i < ret; i++) {
|
|
io_debug("dispatch_kqueue: fd, kev.flags", (int)kev[i].ident, kev[i].flags);
|
|
if (kev[i].flags & (EV_EOF|EV_ERROR)) {
|
|
if (kev[i].flags & EV_ERROR)
|
|
Log(LOG_ERR, "kevent fd %d: EV_ERROR (%s)",
|
|
(int)kev[i].ident, strerror((int)kev[i].data));
|
|
io_docallback((int)kev[i].ident, IO_ERROR);
|
|
continue;
|
|
}
|
|
|
|
switch (kev[i].filter) {
|
|
case EVFILT_READ:
|
|
io_docallback((int)kev[i].ident, IO_WANTREAD);
|
|
break;
|
|
case EVFILT_WRITE:
|
|
io_docallback((int)kev[i].ident, IO_WANTWRITE);
|
|
break;
|
|
default:
|
|
LogDebug("Unknown kev.filter number %d for fd %d",
|
|
kev[i].filter, kev[i].ident);
|
|
/* Fall through */
|
|
case EV_ERROR:
|
|
io_docallback((int)kev[i].ident, IO_ERROR);
|
|
break;
|
|
}
|
|
}
|
|
ts.tv_sec = 0;
|
|
ts.tv_nsec = 0;
|
|
} while (ret == 100);
|
|
|
|
return total;
|
|
}
|
|
|
|
static void
|
|
io_library_init_kqueue(unsigned int eventsize)
|
|
{
|
|
io_masterfd = kqueue();
|
|
|
|
Log(LOG_INFO,
|
|
"IO subsystem: kqueue (initial maxfd %u, masterfd %d)",
|
|
eventsize, io_masterfd);
|
|
if (io_masterfd >= 0)
|
|
library_initialized = true;
|
|
}
|
|
#else
|
|
static inline void io_library_init_kqueue(unsigned int UNUSED ev) {/* NOTHING */}
|
|
#endif
|
|
|
|
|
|
bool
|
|
io_library_init(unsigned int eventsize)
|
|
{
|
|
if (library_initialized)
|
|
return true;
|
|
|
|
if ((eventsize > 0) && !array_alloc(&io_events, sizeof(io_event), (size_t)eventsize))
|
|
eventsize = 0;
|
|
|
|
io_library_init_epoll(eventsize);
|
|
io_library_init_kqueue(eventsize);
|
|
io_library_init_devpoll(eventsize);
|
|
io_library_init_poll(eventsize);
|
|
io_library_init_select(eventsize);
|
|
|
|
return library_initialized;
|
|
}
|
|
|
|
|
|
void
|
|
io_library_shutdown(void)
|
|
{
|
|
#ifdef IO_USE_SELECT
|
|
FD_ZERO(&readers);
|
|
FD_ZERO(&writers);
|
|
#endif
|
|
#if defined(IO_USE_EPOLL) || defined(IO_USE_KQUEUE) || defined(IO_USE_DEVPOLL)
|
|
if (io_masterfd >= 0)
|
|
close(io_masterfd);
|
|
io_masterfd = -1;
|
|
#endif
|
|
#ifdef IO_USE_KQUEUE
|
|
array_free(&io_evcache);
|
|
#endif
|
|
library_initialized = false;
|
|
}
|
|
|
|
|
|
bool
|
|
io_event_setcb(int fd, void (*cbfunc) (int, short))
|
|
{
|
|
io_event *i = io_event_get(fd);
|
|
if (!i)
|
|
return false;
|
|
|
|
i->callback = cbfunc;
|
|
return true;
|
|
}
|
|
|
|
|
|
static bool
|
|
backend_create_ev(int fd, short what)
|
|
{
|
|
bool ret;
|
|
#ifdef IO_USE_DEVPOLL
|
|
ret = io_event_change_devpoll(fd, what);
|
|
#endif
|
|
#ifdef IO_USE_POLL
|
|
ret = io_event_change_poll(fd, what);
|
|
#endif
|
|
#ifdef IO_USE_EPOLL
|
|
ret = io_event_change_epoll(fd, what, EPOLL_CTL_ADD);
|
|
#endif
|
|
#ifdef IO_USE_KQUEUE
|
|
ret = io_event_change_kqueue(fd, what, EV_ADD|EV_ENABLE);
|
|
#endif
|
|
#ifdef IO_USE_SELECT
|
|
if (io_masterfd < 0)
|
|
ret = io_event_add(fd, what);
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
|
|
bool
|
|
io_event_create(int fd, short what, void (*cbfunc) (int, short))
|
|
{
|
|
bool ret;
|
|
io_event *i;
|
|
|
|
assert(fd >= 0);
|
|
#if defined(IO_USE_SELECT) && defined(FD_SETSIZE)
|
|
if (io_masterfd < 0 && fd >= FD_SETSIZE) {
|
|
Log(LOG_ERR,
|
|
"fd %d exceeds FD_SETSIZE (%u) (select can't handle more file descriptors)",
|
|
fd, FD_SETSIZE);
|
|
return false;
|
|
}
|
|
#endif
|
|
i = (io_event *) array_alloc(&io_events, sizeof(io_event), (size_t) fd);
|
|
if (!i) {
|
|
Log(LOG_WARNING,
|
|
"array_alloc failed: could not allocate space for %d io_event structures",
|
|
fd);
|
|
return false;
|
|
}
|
|
|
|
i->callback = cbfunc;
|
|
i->what = 0;
|
|
ret = backend_create_ev(fd, what);
|
|
if (ret)
|
|
i->what = what;
|
|
return ret;
|
|
}
|
|
|
|
|
|
bool
|
|
io_event_add(int fd, short what)
|
|
{
|
|
io_event *i = io_event_get(fd);
|
|
|
|
if (!i) return false;
|
|
|
|
if ((i->what & what) == what) /* event type is already registered */
|
|
return true;
|
|
|
|
io_debug("io_event_add: fd, what", fd, what);
|
|
|
|
i->what |= what;
|
|
#ifdef IO_USE_EPOLL
|
|
if (io_masterfd >= 0)
|
|
return io_event_change_epoll(fd, i->what, EPOLL_CTL_MOD);
|
|
#endif
|
|
#ifdef IO_USE_KQUEUE
|
|
return io_event_change_kqueue(fd, what, EV_ADD | EV_ENABLE);
|
|
#endif
|
|
#ifdef IO_USE_DEVPOLL
|
|
return io_event_change_devpoll(fd, i->what);
|
|
#endif
|
|
#ifdef IO_USE_POLL
|
|
return io_event_change_poll(fd, i->what);
|
|
#endif
|
|
#ifdef IO_USE_SELECT
|
|
if (fd > select_maxfd)
|
|
select_maxfd = fd;
|
|
|
|
if (what & IO_WANTREAD)
|
|
FD_SET(fd, &readers);
|
|
if (what & IO_WANTWRITE)
|
|
FD_SET(fd, &writers);
|
|
|
|
return true;
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
|
|
bool
|
|
io_setnonblock(int fd)
|
|
{
|
|
int flags = fcntl(fd, F_GETFL);
|
|
if (flags == -1)
|
|
return false;
|
|
#ifndef O_NONBLOCK
|
|
#define O_NONBLOCK O_NDELAY
|
|
#endif
|
|
flags |= O_NONBLOCK;
|
|
|
|
return fcntl(fd, F_SETFL, flags) == 0;
|
|
}
|
|
|
|
|
|
bool
|
|
io_close(int fd)
|
|
{
|
|
io_event *i;
|
|
|
|
i = io_event_get(fd);
|
|
#ifdef IO_USE_KQUEUE
|
|
if (array_length(&io_evcache, sizeof (struct kevent))) /* pending data in cache? */
|
|
io_event_kqueue_commit_cache();
|
|
|
|
/* both kqueue and epoll remove fd from all sets automatically on the last close
|
|
* of the descriptor. since we don't know if this is the last close we'll have
|
|
* to remove the set explicitly. */
|
|
if (i) {
|
|
io_event_change_kqueue(fd, i->what, EV_DELETE);
|
|
io_event_kqueue_commit_cache();
|
|
}
|
|
#endif
|
|
io_close_devpoll(fd);
|
|
io_close_poll(fd);
|
|
io_close_select(fd);
|
|
#ifdef IO_USE_EPOLL
|
|
io_event_change_epoll(fd, 0, EPOLL_CTL_DEL);
|
|
#endif
|
|
if (i) {
|
|
i->callback = NULL;
|
|
i->what = 0;
|
|
}
|
|
return close(fd) == 0;
|
|
}
|
|
|
|
|
|
bool
|
|
io_event_del(int fd, short what)
|
|
{
|
|
io_event *i = io_event_get(fd);
|
|
|
|
io_debug("io_event_del: trying to delete eventtype; fd, what", fd, what);
|
|
if (!i) return false;
|
|
|
|
if (!(i->what & what)) /* event is already disabled */
|
|
return true;
|
|
|
|
i->what &= ~what;
|
|
#ifdef IO_USE_DEVPOLL
|
|
return io_event_change_devpoll(fd, i->what);
|
|
#endif
|
|
#ifdef IO_USE_POLL
|
|
return io_event_change_poll(fd, i->what);
|
|
#endif
|
|
#ifdef IO_USE_EPOLL
|
|
if (io_masterfd >= 0)
|
|
return io_event_change_epoll(fd, i->what, EPOLL_CTL_MOD);
|
|
#endif
|
|
#ifdef IO_USE_KQUEUE
|
|
return io_event_change_kqueue(fd, what, EV_DISABLE);
|
|
#endif
|
|
#ifdef IO_USE_SELECT
|
|
if (what & IO_WANTWRITE)
|
|
FD_CLR(fd, &writers);
|
|
|
|
if (what & IO_WANTREAD)
|
|
FD_CLR(fd, &readers);
|
|
return true;
|
|
#endif
|
|
return false;
|
|
}
|
|
|
|
|
|
int
|
|
io_dispatch(struct timeval *tv)
|
|
{
|
|
#ifdef IO_USE_EPOLL
|
|
if (io_masterfd >= 0)
|
|
return io_dispatch_epoll(tv);
|
|
#endif
|
|
#ifdef IO_USE_SELECT
|
|
return io_dispatch_select(tv);
|
|
#endif
|
|
#ifdef IO_USE_KQUEUE
|
|
return io_dispatch_kqueue(tv);
|
|
#endif
|
|
#ifdef IO_USE_DEVPOLL
|
|
return io_dispatch_devpoll(tv);
|
|
#endif
|
|
#ifdef IO_USE_POLL
|
|
return io_dispatch_poll(tv);
|
|
#endif
|
|
return -1;
|
|
}
|
|
|
|
|
|
/* call the callback function inside the struct matching fd */
|
|
static void
|
|
io_docallback(int fd, short what)
|
|
{
|
|
io_event *i = io_event_get(fd);
|
|
|
|
io_debug("io_docallback; fd, what", fd, what);
|
|
|
|
if (i->callback) { /* callback might be NULL if a 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) that were registered */
|
|
}
|