1/*********************************************************************** 2* * 3* This software is part of the ast package * 4* Copyright (c) 1985-2011 AT&T Intellectual Property * 5* and is licensed under the * 6* Common Public License, Version 1.0 * 7* by AT&T Intellectual Property * 8* * 9* A copy of the License is available at * 10* http://www.opensource.org/licenses/cpl1.0.txt * 11* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12* * 13* Information and Software Systems Research * 14* AT&T Research * 15* Florham Park NJ * 16* * 17* Glenn Fowler <gsf@research.att.com> * 18* David Korn <dgk@research.att.com> * 19* Phong Vo <kpv@research.att.com> * 20* * 21***********************************************************************/ 22#pragma prototyped 23 24#include <tv.h> 25#include <tm.h> 26 27#include "FEATURE/tvlib" 28 29#if !_lib_nanosleep 30# if _lib_select 31# if _sys_select 32# include <sys/select.h> 33# else 34# include <sys/socket.h> 35# endif 36# else 37# if !_lib_usleep 38# if _lib_poll_notimer 39# undef _lib_poll 40# endif 41# if _lib_poll 42# include <poll.h> 43# endif 44# endif 45# endif 46#endif 47 48/* 49 * sleep for tv 50 * non-zero exit if sleep did not complete 51 * with remaining time in rv 52 */ 53 54int 55tvsleep(register const Tv_t* tv, register Tv_t* rv) 56{ 57 58#if _lib_nanosleep 59 60 struct timespec stv; 61 struct timespec srv; 62 int r; 63 64 stv.tv_sec = tv->tv_sec; 65 stv.tv_nsec = tv->tv_nsec; 66 if ((r = nanosleep(&stv, &srv)) && rv) 67 { 68 rv->tv_sec = srv.tv_sec; 69 rv->tv_nsec = srv.tv_nsec; 70 } 71 return r; 72 73#else 74 75#if _lib_select 76 77 struct timeval stv; 78 79 stv.tv_sec = tv->tv_sec; 80 stv.tv_usec = tv->tv_nsec / 1000; 81 if (select(0, NiL, NiL, NiL, &stv) < 0) 82 { 83 if (rv) 84 *rv = *tv; 85 return -1; 86 } 87 if (rv) 88 { 89 rv->tv_sec = stv.tv_sec; 90 rv->tv_nsec = stv.tv_usec * 1000; 91 } 92 return 0; 93 94#else 95 96 unsigned int s = tv->tv_sec; 97 uint32_t n = tv->tv_nsec; 98 99#if _lib_usleep 100 101 102 unsigned long t; 103 104 if (t = (n + 999L) / 1000L) 105 { 106 usleep(t); 107 s -= t / 1000000L; 108 n = 0; 109 } 110 111#else 112 113#if _lib_poll 114 115 struct pollfd pfd; 116 int t; 117 118 if ((t = (n + 999999L) / 1000000L) > 0) 119 { 120 poll(&pfd, 0, t); 121 s -= t / 1000L; 122 n = 0; 123 } 124 125#endif 126 127#endif 128 129 if ((s += (n + 999999999L) / 1000000000L) && (s = sleep(s))) 130 { 131 if (rv) 132 { 133 rv->tv_sec = s; 134 rv->tv_nsec = 0; 135 } 136 return -1; 137 } 138 return 0; 139 140#endif 141 142#endif 143 144} 145