1 /* 2 * Copyright (C) 1991-1994,1996-2003,2005,2006,2009 3 * Free Software Foundation, Inc. 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., 51 Franklin Street, Fifth Floor, 18 * Boston, MA 02110-1301 USA 19 */ 20 21 #include <sys/time.h> 22 23 #ifndef timersub 24 # define timersub(a, b, result) \ 25 do { \ 26 (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \ 27 (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \ 28 if ((result)->tv_usec < 0) { \ 29 --(result)->tv_sec; \ 30 (result)->tv_usec += 1000000; \ 31 } \ 32 } while (0) 33 #endif 34