Line data    Source code

       1             : /* Copyright (C) 1989-2014  Free Software Foundation, Inc.
       2             :      Written by James Clark (jjc@jclark.com)
       3             : 
       4             : This file is part of groff, the GNU roff typesetting system.
       5             : 
       6             : groff is free software; you can redistribute it and/or modify it under
       7             : the terms of the GNU General Public License as published by the Free
       8             : Software Foundation, either version 3 of the License, or
       9             : (at your option) any later version.
      10             : 
      11             : groff is distributed in the hope that it will be useful, but WITHOUT ANY
      12             : WARRANTY; without even the implied warranty of MERCHANTABILITY or
      13             : FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      14             : for more details.
      15             : 
      16             : You should have received a copy of the GNU General Public License
      17             : along with this program.  If not, see <http://www.gnu.org/licenses/>. */
      18             : 
      19             : #ifdef HAVE_CONFIG_H
      20             : #include <config.h>
      21             : #endif
      22             : 
      23             : #include <stdlib.h>
      24             : 
      25             : #ifdef HAVE_MMAP
      26             : 
      27             : #include <sys/types.h>
      28             : #include <sys/mman.h>
      29             : 
      30             : /* The Net-2 man pages says that a MAP_FILE flag is required. */
      31             : #ifndef MAP_FILE
      32             : #define MAP_FILE 0
      33             : #endif
      34             : 
      35             : #ifdef __cplusplus
      36             : extern "C" {
      37             : #endif
      38             : 
      39             : /* Prototypes */
      40             : char *mapread(int, int);
      41             : int unmap(char *, int);
      42             : 
      43           0 : char *mapread(int fd, int nbytes)
      44             : {
      45           0 :   char *p = (char *)mmap((void *)0, (size_t)nbytes, PROT_READ,
      46             :                          MAP_FILE|MAP_PRIVATE, fd, (off_t)0);
      47           0 :   if (p == MAP_FAILED)
      48           0 :     return 0;
      49             :   /* mmap() shouldn't return 0 since MAP_FIXED wasn't specified. */
      50           0 :   if (p == 0)
      51           0 :     abort();
      52           0 :   return p;
      53             : }
      54             : 
      55           0 : int unmap(char *p, int len)
      56             : {
      57           0 :   return munmap((void *)p, len);
      58             : }
      59             : 
      60             : #ifdef __cplusplus
      61             : }
      62             : #endif
      63             : 
      64             : #else /* not HAVE_MMAP */
      65             : 
      66             : #include <errno.h>
      67             : 
      68             : #ifdef __cplusplus
      69             : extern "C" {
      70             : #endif
      71             : 
      72             : char *mapread(int fd, int nbytes)
      73             : {
      74             :   errno = ENODEV;
      75             :   return 0;
      76             : }
      77             : 
      78             : int unmap(char *p, int len)
      79             : {
      80             :   errno = EINVAL;
      81             :   return -1;
      82             : }
      83             : 
      84             : #ifdef __cplusplus
      85             : }
      86             : #endif
      87             : 
      88             : #endif /* not HAVE_MMAP */
      89             : 
      90             : // Local Variables:
      91             : // fill-column: 72
      92             : // mode: C++
      93             : // End:
      94             : // vim: set cindent noexpandtab shiftwidth=2 textwidth=72: