1 /* Copyright (C) 1991-1994,96,97,98,99,2000,01,02 2 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20 /* never worry about timersub type activies again -- from GLIBC and upcased. */ 21 #define TIMERSUB(a, b, result) \ 22 do { \ 23 (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \ 24 (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \ 25 if ((result)->tv_usec < 0) { \ 26 --(result)->tv_sec; \ 27 (result)->tv_usec += 1000000; \ 28 } \ 29 } while (0) 30 31