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82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
// $Id: ReventFd.cpp 887 2017-04-28 19:32:52Z mueller $
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//
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// Copyright 2013- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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//
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// This program is free software; you may redistribute and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation, either version 2, 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, but
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// WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for complete details.
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//
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// Revision History:
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// Date Rev Version Comment
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// 2013-01-14 475 1.0 Initial version
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// 2013-01-11 473 0.5 First draft
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// ---------------------------------------------------------------------------
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/*!
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\file
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\brief Implemenation of class ReventFd.
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*/
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#include <errno.h>
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#include <unistd.h>
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#include <sys/eventfd.h>
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#include "ReventFd.hpp"
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#include "librtools/Rexception.hpp"
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using namespace std;
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/*!
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\class Retro::ReventFd
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\brief FIXME_docs
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*/
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// all method definitions in namespace Retro
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namespace Retro {
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//------------------------------------------+-----------------------------------
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//! FIXME_docs
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ReventFd::ReventFd()
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{
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fFd = ::eventfd(0,0); // ini value = 0; no flags
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if (fFd < 0)
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throw Rexception("ReventFd::ctor", "eventfd() failed: ", errno);
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}
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//------------------------------------------+-----------------------------------
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//! FIXME_docs
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ReventFd::~ReventFd()
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{
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::close(fFd);
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}
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//------------------------------------------+-----------------------------------
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//! FIXME_docs
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int ReventFd::SignalFd(int fd)
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{
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uint64_t one(1);
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int irc = ::write(fd, &one, sizeof(one));
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return irc;
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}
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//------------------------------------------+-----------------------------------
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//! FIXME_docs
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int ReventFd::WaitFd(int fd)
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{
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uint64_t buf;
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int irc = ::read(fd, &buf, sizeof(buf));
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return (irc <= 0) ? irc : (int)buf;
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}
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} // end namespace Retro
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