src/lib-bib/map.c

   1 /*@
   2  * Copyright (c) 2014 Steffen (Daode) Nurpmeso <sdaoden@users.sf.net>.
   3  *
   4  * Copyright (C) 1989 - 1992, 2000, 2001, 2004
   5  *    Free Software Foundation, Inc.
   6  *      Written by James Clark (jjc@jclark.com)
   7  *
   8  * groff is free software; you can redistribute it and/or modify it under
   9  * the terms of the GNU General Public License as published by the Free
  10  * Software Foundation; either version 2, or (at your option) any later
  11  * version.
  12  *
  13  * groff is distributed in the hope that it will be useful, but WITHOUT ANY
  14  * WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16  * for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with groff; see the file COPYING.  If not, write to the Free Software
  20  * Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA.
  21  */
  22
  23 #include "config.h"
  24 #include "lib.h"
  25
  26 #include <stdlib.h>
  27
  28 #ifdef HAVE_MMAP /* FIXME */
  29 # include <sys/types.h>
  30 # include <sys/mman.h>
  31 #else
  32 # include <errno.h>
  33 #endif
  34
  35 #include "bib.h"
  36
  37 #ifdef HAVE_MMAP /* FIXME */
  38   /* The Net-2 man pages says that a MAP_FILE flag is required. */
  39 # ifndef MAP_FILE
  40 #  define MAP_FILE 0
  41 # endif
  42
  43 char *mapread(int fd, int nbytes)
  44 {
  45   char *p = (char *)mmap((void *)0, (size_t)nbytes, PROT_READ,
  46                          MAP_FILE|MAP_PRIVATE, fd, (off_t)0);
  47   if (p == (char *)-1)
  48     return 0;
  49   /* mmap() shouldn't return 0 since MAP_FIXED wasn't specified. */
  50   if (p == 0)
  51     abort();
  52   return p;
  53 }
  54
  55 int unmap(char *p, int len)
  56 {
  57   return munmap((void *)p, len);
  58 }
  59
  60 #else // HAVE_MMAP
  61 char *mapread(int fd, int nbytes)
  62 {
  63   errno = ENODEV;
  64   return 0;
  65 }
  66
  67 int unmap(char *p, int len)
  68 {
  69   errno = EINVAL;
  70   return -1;
  71 }
  72 #endif // HAVE_MMAP
  73
  74 // s-it2-mode