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- /* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
- Written by James Clark (jjc@jclark.com)
-
- This file is part of groff.
-
- groff is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License as published by the Free
- Software Foundation; either version 2, or (at your option) any later
- version.
-
- groff is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
-
- You should have received a copy of the GNU General Public License along
- with groff; see the file COPYING. If not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #ifdef HAVE_MMAP
-
- #include <sys/types.h>
- #include <sys/mman.h>
-
- /* The Net-2 man pages says that a MAP_FILE flag is required. */
- #ifndef MAP_FILE
- #define MAP_FILE 0
- #endif
-
- char *mapread(fd, nbytes)
- int fd;
- int nbytes;
- {
- char *p = (char *)mmap((caddr_t)0, (size_t)nbytes, PROT_READ,
- MAP_FILE|MAP_PRIVATE, fd, (off_t)0);
- if (p == (char *)-1)
- return 0;
- /* mmap() shouldn't return 0 since MAP_FIXED wasn't specified. */
- if (p == 0)
- abort();
- return p;
- }
-
- int unmap(p, len)
- char *p;
- int len;
- {
- return munmap((caddr_t)p, len);
- }
-
- #else /* not HAVE_MMAP */
-
- #include <errno.h>
-
- #ifndef errno
- extern int errno;
- #endif
-
- char *mapread(fd, nbytes)
- int fd;
- int nbytes;
- {
- errno = ENODEV;
- return 0;
- }
-
- int unmap(p, len)
- char *p;
- int len;
- {
- errno = EINVAL;
- return -1;
- }
-
- #endif /* not HAVE_MMAP */
-