usr/src/lib/libc/port/gen/settimeofday.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include "lint.h"
  33 #include <sys/types.h>
  34 #include <sys/time.h>
  35 #include <stdio.h>
  36 #include <unistd.h>
  37 #include <errno.h>
  38
  39 /*
  40  * Set the time.
  41  * Don't do anything with the timezone information.
  42  */
  43
  44 /*ARGSUSED1*/
  45 int
  46 settimeofday(struct timeval *tp, void *tzp)
  47 {
  48         time_t t;               /* time in seconds */
  49
  50         if (tp == NULL)
  51                 return (0);
  52
  53         if (tp->tv_sec < 0 || tp->tv_usec < 0 || tp->tv_usec >= MICROSEC) {
  54                 errno = EINVAL;
  55                 return (-1);
  56         }
  57
  58         t = (time_t)tp->tv_sec;
  59         if (tp->tv_usec >= (MICROSEC/2))
  60                 /* round up */
  61                 t++;
  62
  63         return (stime(&t));
  64 }