projects / dragonfly.git / blame
| Commit | Line | Data |
|---|---|---|
| 4d3e9548 | 1 | /* Copyright (C) 1989, 1990, 1991, 1992, 2000, 2001, 2004, 2009 |
| 92d0a6a6 JR |
2 | Free Software Foundation, Inc. |
| 3 | Written by James Clark (jjc@jclark.com) | |
| 4 | ||
| 5 | This file is part of groff. | |
| 6 | ||
| 7 | groff is free software; you can redistribute it and/or modify it under | |
| 8 | the terms of the GNU General Public License as published by the Free | |
| 4d3e9548 JL |
9 | Software Foundation, either version 3 of the License, or |
| 10 | (at your option) any later version. | |
| 92d0a6a6 JR |
11 | |
| 12 | groff is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 | for more details. | |
| 16 | ||
| 4d3e9548 JL |
17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
| 92d0a6a6 JR |
19 | |
| 20 | #include <stdlib.h> | |
| 21 | ||
| 22 | #ifdef HAVE_CONFIG_H | |
| 23 | #include <config.h> | |
| 24 | #endif | |
| 25 | ||
| 26 | #ifdef HAVE_MMAP | |
| 27 | ||
| 28 | #include <sys/types.h> | |
| 29 | #include <sys/mman.h> | |
| 30 | ||
| 31 | /* The Net-2 man pages says that a MAP_FILE flag is required. */ | |
| 32 | #ifndef MAP_FILE | |
| 33 | #define MAP_FILE 0 | |
| 34 | #endif | |
| 35 | ||
| 36 | #ifdef __cplusplus | |
| 37 | extern "C" { | |
| 38 | #endif | |
| 39 | ||
| 40 | char *mapread(int fd, int nbytes) | |
| 41 | { | |
| 42 | char *p = (char *)mmap((void *)0, (size_t)nbytes, PROT_READ, | |
| 43 | MAP_FILE|MAP_PRIVATE, fd, (off_t)0); | |
| 44 | if (p == (char *)-1) | |
| 45 | return 0; | |
| 46 | /* mmap() shouldn't return 0 since MAP_FIXED wasn't specified. */ | |
| 47 | if (p == 0) | |
| 48 | abort(); | |
| 49 | return p; | |
| 50 | } | |
| 51 | ||
| 52 | int unmap(char *p, int len) | |
| 53 | { | |
| 54 | return munmap((void *)p, len); | |
| 55 | } | |
| 56 | ||
| 57 | #ifdef __cplusplus | |
| 58 | } | |
| 59 | #endif | |
| 60 | ||
| 61 | #else /* not HAVE_MMAP */ | |
| 62 | ||
| 63 | #include <errno.h> | |
| 64 | ||
| 65 | #ifdef __cplusplus | |
| 66 | extern "C" { | |
| 67 | #endif | |
| 68 | ||
| 69 | char *mapread(int fd, int nbytes) | |
| 70 | { | |
| 71 | errno = ENODEV; | |
| 72 | return 0; | |
| 73 | } | |
| 74 | ||
| 75 | int unmap(char *p, int len) | |
| 76 | { | |
| 77 | errno = EINVAL; | |
| 78 | return -1; | |
| 79 | } | |
| 80 | ||
| 81 | #ifdef __cplusplus | |
| 82 | } | |
| 83 | #endif | |
| 84 | ||
| 85 | #endif /* not HAVE_MMAP */ |