1/* timeval.c - functions to perform operations on struct timevals */ 2 3/* Copyright (C) 1999 Free Software Foundation, Inc. 4 5 This file is part of GNU Bash, the Bourne Again SHell. 6 7 Bash is free software: you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation, either version 3 of the License, or 10 (at your option) any later version. 11 12 Bash is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with Bash. If not, see <http://www.gnu.org/licenses/>. 19*/ 20 21#include <config.h> 22 23#if defined (HAVE_TIMEVAL) 24 25#include <sys/types.h> 26#include <posixtime.h> 27 28#include <stdio.h> 29 30struct timeval * 31difftimeval (d, t1, t2) 32 struct timeval *d, *t1, *t2; 33{ 34 d->tv_sec = t2->tv_sec - t1->tv_sec; 35 d->tv_usec = t2->tv_usec - t1->tv_usec; 36 if (d->tv_usec < 0) 37 { 38 d->tv_usec += 1000000; 39 d->tv_sec -= 1; 40 if (d->tv_sec < 0) /* ??? -- BSD/OS does this */ 41 { 42 d->tv_sec = 0; 43 d->tv_usec = 0; 44 } 45 } 46 return d; 47} 48 49struct timeval * 50addtimeval (d, t1, t2) 51 struct timeval *d, *t1, *t2; 52{ 53 d->tv_sec = t1->tv_sec + t2->tv_sec; 54 d->tv_usec = t1->tv_usec + t2->tv_usec; 55 if (d->tv_usec >= 1000000) 56 { 57 d->tv_usec -= 1000000; 58 d->tv_sec += 1; 59 } 60 return d; 61} 62 63/* Do "cpu = ((user + sys) * 10000) / real;" with timevals. 64 Barely-tested code from Deven T. Corzine <deven@ties.org>. */ 65int 66timeval_to_cpu (rt, ut, st) 67 struct timeval *rt, *ut, *st; /* real, user, sys */ 68{ 69 struct timeval t1, t2; 70 register int i; 71 72 addtimeval (&t1, ut, st); 73 t2.tv_sec = rt->tv_sec; 74 t2.tv_usec = rt->tv_usec; 75 76 for (i = 0; i < 6; i++) 77 { 78 if ((t1.tv_sec > 99999999) || (t2.tv_sec > 99999999)) 79 break; 80 t1.tv_sec *= 10; 81 t1.tv_sec += t1.tv_usec / 100000; 82 t1.tv_usec *= 10; 83 t1.tv_usec %= 1000000; 84 t2.tv_sec *= 10; 85 t2.tv_sec += t2.tv_usec / 100000; 86 t2.tv_usec *= 10; 87 t2.tv_usec %= 1000000; 88 } 89 for (i = 0; i < 4; i++) 90 { 91 if (t1.tv_sec < 100000000) 92 t1.tv_sec *= 10; 93 else 94 t2.tv_sec /= 10; 95 } 96 97 return ((t2.tv_sec == 0) ? 0 : t1.tv_sec / t2.tv_sec); 98} 99 100/* Convert a pointer to a struct timeval to seconds and thousandths of a 101 second, returning the values in *SP and *SFP, respectively. This does 102 rounding on the fractional part, not just truncation to three places. */ 103void 104timeval_to_secs (tvp, sp, sfp) 105 struct timeval *tvp; 106 time_t *sp; 107 int *sfp; 108{ 109 int rest; 110 111 *sp = tvp->tv_sec; 112 113 *sfp = tvp->tv_usec % 1000000; /* pretty much a no-op */ 114 rest = *sfp % 1000; 115 *sfp = (*sfp * 1000) / 1000000; 116 if (rest >= 500) 117 *sfp += 1; 118 119 /* Sanity check */ 120 if (*sfp >= 1000) 121 { 122 *sp += 1; 123 *sfp -= 1000; 124 } 125} 126 127/* Print the contents of a struct timeval * in a standard way to stdio 128 stream FP. */ 129void 130print_timeval (fp, tvp) 131 FILE *fp; 132 struct timeval *tvp; 133{ 134 time_t timestamp; 135 long minutes; 136 int seconds, seconds_fraction; 137 138 timeval_to_secs (tvp, ×tamp, &seconds_fraction); 139 140 minutes = timestamp / 60; 141 seconds = timestamp % 60; 142 143 fprintf (fp, "%ldm%d.%03ds", minutes, seconds, seconds_fraction); 144} 145#endif /* HAVE_TIMEVAL */ 146