76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
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Written by James Clark (jjc@jclark.com)
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This file is part of groff.
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groff is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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groff is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with groff; see the file COPYING. If not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#ifdef HAVE_MMAP
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#include <sys/types.h>
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#include <sys/mman.h>
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/* The Net-2 man pages says that a MAP_FILE flag is required. */
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#ifndef MAP_FILE
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#define MAP_FILE 0
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#endif
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char *mapread(fd, nbytes)
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int fd;
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int nbytes;
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{
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char *p = (char *)mmap((caddr_t)0, (size_t)nbytes, PROT_READ,
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MAP_FILE|MAP_PRIVATE, fd, (off_t)0);
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if (p == (char *)-1)
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return 0;
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/* mmap() shouldn't return 0 since MAP_FIXED wasn't specified. */
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if (p == 0)
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abort();
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return p;
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}
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int unmap(p, len)
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char *p;
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int len;
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{
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return munmap((caddr_t)p, len);
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}
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#else /* not HAVE_MMAP */
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#include <errno.h>
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#ifndef errno
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extern int errno;
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#endif
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char *mapread(fd, nbytes)
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int fd;
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int nbytes;
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{
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errno = ENODEV;
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return 0;
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}
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int unmap(p, len)
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char *p;
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int len;
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{
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errno = EINVAL;
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return -1;
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}
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#endif /* not HAVE_MMAP */
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