1*4887Schin /*********************************************************************** 2*4887Schin * * 3*4887Schin * This software is part of the ast package * 4*4887Schin * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5*4887Schin * and is licensed under the * 6*4887Schin * Common Public License, Version 1.0 * 7*4887Schin * by AT&T Knowledge Ventures * 8*4887Schin * * 9*4887Schin * A copy of the License is available at * 10*4887Schin * http://www.opensource.org/licenses/cpl1.0.txt * 11*4887Schin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12*4887Schin * * 13*4887Schin * Information and Software Systems Research * 14*4887Schin * AT&T Research * 15*4887Schin * Florham Park NJ * 16*4887Schin * * 17*4887Schin * Glenn Fowler <gsf@research.att.com> * 18*4887Schin * David Korn <dgk@research.att.com> * 19*4887Schin * Phong Vo <kpv@research.att.com> * 20*4887Schin * * 21*4887Schin ***********************************************************************/ 22*4887Schin #pragma prototyped 23*4887Schin 24*4887Schin #include <tv.h> 25*4887Schin #include <tm.h> 26*4887Schin 27*4887Schin #include "FEATURE/tvlib" 28*4887Schin 29*4887Schin #if !_lib_nanosleep 30*4887Schin # if _lib_select 31*4887Schin # if _sys_select 32*4887Schin # include <sys/select.h> 33*4887Schin # else 34*4887Schin # include <sys/socket.h> 35*4887Schin # endif 36*4887Schin # else 37*4887Schin # if !_lib_usleep 38*4887Schin # if _lib_poll_notimer 39*4887Schin # undef _lib_poll 40*4887Schin # endif 41*4887Schin # if _lib_poll 42*4887Schin # include <poll.h> 43*4887Schin # endif 44*4887Schin # endif 45*4887Schin # endif 46*4887Schin #endif 47*4887Schin 48*4887Schin /* 49*4887Schin * sleep for tv 50*4887Schin * non-zero exit if sleep did not complete 51*4887Schin * with remaining time in rv 52*4887Schin */ 53*4887Schin 54*4887Schin int 55*4887Schin tvsleep(register const Tv_t* tv, register Tv_t* rv) 56*4887Schin { 57*4887Schin 58*4887Schin #if _lib_nanosleep 59*4887Schin 60*4887Schin struct timespec stv; 61*4887Schin struct timespec srv; 62*4887Schin int r; 63*4887Schin 64*4887Schin stv.tv_sec = tv->tv_sec; 65*4887Schin stv.tv_nsec = tv->tv_nsec; 66*4887Schin if ((r = nanosleep(&stv, &srv)) && rv) 67*4887Schin { 68*4887Schin rv->tv_sec = srv.tv_sec; 69*4887Schin rv->tv_nsec = srv.tv_nsec; 70*4887Schin } 71*4887Schin return r; 72*4887Schin 73*4887Schin #else 74*4887Schin 75*4887Schin #if _lib_select 76*4887Schin 77*4887Schin struct timeval stv; 78*4887Schin 79*4887Schin stv.tv_sec = tv->tv_sec; 80*4887Schin stv.tv_usec = tv->tv_nsec / 1000; 81*4887Schin if (select(0, NiL, NiL, NiL, &stv) < 0) 82*4887Schin { 83*4887Schin if (rv) 84*4887Schin *rv = *tv; 85*4887Schin return -1; 86*4887Schin } 87*4887Schin if (rv) 88*4887Schin { 89*4887Schin rv->tv_sec = stv.tv_sec; 90*4887Schin rv->tv_nsec = stv.tv_usec * 1000; 91*4887Schin } 92*4887Schin return 0; 93*4887Schin 94*4887Schin #else 95*4887Schin 96*4887Schin unsigned int s = tv->tv_sec; 97*4887Schin uint32_t n = tv->tv_nsec; 98*4887Schin 99*4887Schin #if _lib_usleep 100*4887Schin 101*4887Schin 102*4887Schin unsigned long t; 103*4887Schin 104*4887Schin if (t = (n + 999L) / 1000L) 105*4887Schin { 106*4887Schin usleep(t); 107*4887Schin s -= t / 1000000L; 108*4887Schin n = 0; 109*4887Schin } 110*4887Schin 111*4887Schin #else 112*4887Schin 113*4887Schin #if _lib_poll 114*4887Schin 115*4887Schin struct pollfd pfd; 116*4887Schin int t; 117*4887Schin 118*4887Schin if ((t = (n + 999999L) / 1000000L) > 0) 119*4887Schin { 120*4887Schin poll(&pfd, 0, t); 121*4887Schin s -= t / 1000L; 122*4887Schin n = 0; 123*4887Schin } 124*4887Schin 125*4887Schin #endif 126*4887Schin 127*4887Schin #endif 128*4887Schin 129*4887Schin if ((s += (n + 999999999L) / 1000000000L) && (s = sleep(s))) 130*4887Schin { 131*4887Schin if (rv) 132*4887Schin { 133*4887Schin rv->tv_sec = s; 134*4887Schin rv->tv_nsec = 0; 135*4887Schin } 136*4887Schin return -1; 137*4887Schin } 138*4887Schin return 0; 139*4887Schin 140*4887Schin #endif 141*4887Schin 142*4887Schin #endif 143*4887Schin 144*4887Schin } 145