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