1 /* $NetBSD: citrus_mmap.c,v 1.4 2011/10/15 23:00:01 christos Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause 5 * 6 * Copyright (c)2003 Citrus Project, 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include "namespace.h" 32 #include <sys/mman.h> 33 #include <sys/types.h> 34 #include <sys/stat.h> 35 36 #include <assert.h> 37 #include <errno.h> 38 #include <fcntl.h> 39 #include <limits.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <unistd.h> 44 #include "un-namespace.h" 45 46 #include "citrus_namespace.h" 47 #include "citrus_region.h" 48 #include "citrus_mmap.h" 49 50 int 51 _citrus_map_file(struct _citrus_region * __restrict r, 52 const char * __restrict path) 53 { 54 struct stat st; 55 void *head; 56 int fd, ret; 57 58 ret = 0; 59 60 _region_init(r, NULL, 0); 61 62 if ((fd = _open(path, O_RDONLY | O_CLOEXEC)) == -1) 63 return (errno); 64 65 if (_fstat(fd, &st) == -1) { 66 ret = errno; 67 goto error; 68 } 69 if (!S_ISREG(st.st_mode)) { 70 ret = EOPNOTSUPP; 71 goto error; 72 } 73 74 head = mmap(NULL, (size_t)st.st_size, PROT_READ, MAP_FILE|MAP_PRIVATE, 75 fd, (off_t)0); 76 if (head == MAP_FAILED) { 77 ret = errno; 78 goto error; 79 } 80 _region_init(r, head, (size_t)st.st_size); 81 82 error: 83 (void)_close(fd); 84 return (ret); 85 } 86 87 void 88 _citrus_unmap_file(struct _citrus_region *r) 89 { 90 91 if (_region_head(r) != NULL) { 92 (void)munmap(_region_head(r), _region_size(r)); 93 _region_init(r, NULL, 0); 94 } 95 } 96