usr/src/lib/libast/common/port/touch.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 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  * Glenn Fowler
  25  * AT&T Research
  26  *
  27  * touch file access and modify times of file
  28  * if flags&PATH_TOUCH_CREATE then file will be created if it doesn't exist
  29  * if flags&PATH_TOUCH_VERBATIM then times are taken verbatim
  30  * times have one second granularity
  31  *
  32  *      (time_t)(-1)    retain old time
  33  *      0               use current time
  34  *
  35  * the old interface flag values were:
  36  *       1      PATH_TOUCH_CREATE
  37  *      -1      PATH_TOUCH_CREATE|PATH_TOUCH_VERBATIM
  38  *              PATH_TOUCH_VERBATIM -- not supported
  39  */
  40
  41 #include <ast.h>
  42 #include <times.h>
  43 #include <tv.h>
  44
  45 int
  46 touch(const char* path, time_t at, time_t mt, int flags)
  47 {
  48         Tv_t    av;
  49         Tv_t    mv;
  50         Tv_t*   ap;
  51         Tv_t*   mp;
  52
  53         if (at == (time_t)(-1) && !(flags & PATH_TOUCH_VERBATIM))
  54                 ap = TV_TOUCH_RETAIN;
  55         else if (!at && !(flags & PATH_TOUCH_VERBATIM))
  56                 ap = 0;
  57         else
  58         {
  59                 av.tv_sec = at;
  60                 av.tv_nsec = 0;
  61                 ap = &av;
  62         }
  63         if (mt == (time_t)(-1) && !(flags & PATH_TOUCH_VERBATIM))
  64                 mp = TV_TOUCH_RETAIN;
  65         else if (!mt && !(flags & PATH_TOUCH_VERBATIM))
  66                 mp = 0;
  67         else
  68         {
  69                 mv.tv_sec = mt;
  70                 mv.tv_nsec = 0;
  71                 mp = &mv;
  72         }
  73         return tvtouch(path, ap, mp, NiL, flags & 1);
  74 }