timeval.c++

好东东。linux下面的文件节点、文件状态的变化监听代码

//  Copyright (C) 1999 Silicon Graphics, Inc.  All Rights Reserved.
//  
//  This program is free software; you can redistribute it and/or modify it
//  under the terms of version 2 of the GNU General Public License as
//  published by the Free Software Foundation.
//
//  This program is distributed in the hope that it would be useful, but
//  WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  Further, any
//  license provided herein, whether implied or otherwise, is limited to
//  this program in accordance with the express provisions of the GNU
//  General Public License.  Patent licenses, if any, provided herein do not
//  apply to combinations of this program with other product or programs, or
//  any other product whatsoever.  This program is distributed without any
//  warranty that the program is delivered free of the rightful claim of any
//  third person by way of infringement or the like.  See the GNU General
//  Public License for more details.
//
//  You should have received a copy of the GNU General Public License along
//  with this program; if not, write the Free Software Foundation, Inc., 59
//  Temple Place - Suite 330, Boston MA 02111-1307, USA.

#include "timeval.h"

timeval&
operator += (timeval& left, const timeval& right)
{
    left.tv_sec += right.tv_sec;
    left.tv_usec += right.tv_usec;
    while (left.tv_usec >= 1000000)
    {   left.tv_usec -= 1000000;
	left.tv_sec += 1;
    }
    return left;
}

timeval&
operator -= (timeval& left, const timeval& right)
{
    left.tv_sec -= right.tv_sec;
    left.tv_usec -= right.tv_usec;
    while (left.tv_usec < 0)
    {   left.tv_usec += 1000000;
	left.tv_sec -= 1;
    }
    return left;
}