1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2008 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 54 int 55 tvsleep(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