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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2014 UnitedStack <haomai@unitedstack.com>
*
* Author: Haomai Wang <haomaiwang@gmail.com>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "common/errno.h"
#include <fcntl.h>
#include "EventEpoll.h"
#define dout_subsys ceph_subsys_ms
#undef dout_prefix
#define dout_prefix *_dout << "EpollDriver."
int EpollDriver::init(EventCenter *c, int nevent)
{
events = (struct epoll_event*)calloc(nevent, sizeof(struct epoll_event));
if (!events) {
lderr(cct) << __func__ << " unable to malloc memory. " << dendl;
return -ENOMEM;
}
epfd = epoll_create(1024); /* 1024 is just an hint for the kernel */
if (epfd == -1) {
lderr(cct) << __func__ << " unable to do epoll_create: "
<< cpp_strerror(errno) << dendl;
return -errno;
}
if (::fcntl(epfd, F_SETFD, FD_CLOEXEC) == -1) {
int e = errno;
::close(epfd);
lderr(cct) << __func__ << " unable to set cloexec: "
<< cpp_strerror(e) << dendl;
return -e;
}
this->nevent = nevent;
return 0;
}
int EpollDriver::add_event(int fd, int cur_mask, int add_mask)
{
ldout(cct, 20) << __func__ << " add event fd=" << fd << " cur_mask=" << cur_mask
<< " add_mask=" << add_mask << " to " << epfd << dendl;
struct epoll_event ee;
/* If the fd was already monitored for some event, we need a MOD
* operation. Otherwise we need an ADD operation. */
int op;
op = cur_mask == EVENT_NONE ? EPOLL_CTL_ADD: EPOLL_CTL_MOD;
ee.events = EPOLLET;
add_mask |= cur_mask; /* Merge old events */
if (add_mask & EVENT_READABLE)
ee.events |= EPOLLIN;
if (add_mask & EVENT_WRITABLE)
ee.events |= EPOLLOUT;
ee.data.u64 = 0; /* avoid valgrind warning */
ee.data.fd = fd;
if (epoll_ctl(epfd, op, fd, &ee) == -1) {
lderr(cct) << __func__ << " epoll_ctl: add fd=" << fd << " failed. "
<< cpp_strerror(errno) << dendl;
return -errno;
}
return 0;
}
int EpollDriver::del_event(int fd, int cur_mask, int delmask)
{
ldout(cct, 20) << __func__ << " del event fd=" << fd << " cur_mask=" << cur_mask
<< " delmask=" << delmask << " to " << epfd << dendl;
struct epoll_event ee = {0};
int mask = cur_mask & (~delmask);
int r = 0;
if (mask != EVENT_NONE) {
ee.events = EPOLLET;
ee.data.fd = fd;
if (mask & EVENT_READABLE)
ee.events |= EPOLLIN;
if (mask & EVENT_WRITABLE)
ee.events |= EPOLLOUT;
if ((r = epoll_ctl(epfd, EPOLL_CTL_MOD, fd, &ee)) < 0) {
lderr(cct) << __func__ << " epoll_ctl: modify fd=" << fd << " mask=" << mask
<< " failed." << cpp_strerror(errno) << dendl;
return -errno;
}
} else {
/* Note, Kernel < 2.6.9 requires a non null event pointer even for
* EPOLL_CTL_DEL. */
if ((r = epoll_ctl(epfd, EPOLL_CTL_DEL, fd, &ee)) < 0) {
lderr(cct) << __func__ << " epoll_ctl: delete fd=" << fd
<< " failed." << cpp_strerror(errno) << dendl;
return -errno;
}
}
return 0;
}
int EpollDriver::resize_events(int newsize)
{
return 0;
}
int EpollDriver::event_wait(std::vector<FiredFileEvent> &fired_events, struct timeval *tvp)
{
int retval, numevents = 0;
retval = epoll_wait(epfd, events, nevent,
tvp ? (tvp->tv_sec*1000 + tvp->tv_usec/1000) : -1);
if (retval > 0) {
numevents = retval;
fired_events.resize(numevents);
for (int event_id = 0; event_id < numevents; event_id++) {
int mask = 0;
struct epoll_event *e = &events[event_id];
if (e->events & EPOLLIN) mask |= EVENT_READABLE;
if (e->events & EPOLLOUT) mask |= EVENT_WRITABLE;
if (e->events & EPOLLERR) mask |= EVENT_READABLE|EVENT_WRITABLE;
if (e->events & EPOLLHUP) mask |= EVENT_READABLE|EVENT_WRITABLE;
fired_events[event_id].fd = e->data.fd;
fired_events[event_id].mask = mask;
}
}
return numevents;
}
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