1 /* $NetBSD: citrus_mmap.c,v 1.4 2011/10/15 23:00:01 christos Exp $ */ 2 3 /*- 4 * Copyright (c)2003 Citrus Project, 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #if defined(LIBC_SCCS) && !defined(lint) 31 __RCSID("$NetBSD: citrus_mmap.c,v 1.4 2011/10/15 23:00:01 christos Exp $"); 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include "namespace.h" 35 #include <assert.h> 36 #include <errno.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 #include <fcntl.h> 42 #include <limits.h> 43 #include <sys/mman.h> 44 45 #include "citrus_namespace.h" 46 #include "citrus_region.h" 47 #include "citrus_mmap.h" 48 49 int 50 _citrus_map_file(struct _citrus_region * __restrict r, 51 const char * __restrict path) 52 { 53 int fd, ret = 0; 54 struct stat st; 55 void *head; 56 57 _DIAGASSERT(r != NULL); 58 59 _region_init(r, NULL, 0); 60 61 if ((fd = open(path, O_RDONLY | O_CLOEXEC)) == -1) 62 return errno; 63 64 if (fstat(fd, &st) == -1) { 65 ret = errno; 66 goto error; 67 } 68 if (!S_ISREG(st.st_mode)) { 69 ret = EOPNOTSUPP; 70 goto error; 71 } 72 73 head = mmap(NULL, (size_t)st.st_size, PROT_READ, MAP_FILE|MAP_PRIVATE, 74 fd, (off_t)0); 75 if (head == MAP_FAILED) { 76 ret = errno; 77 goto error; 78 } 79 _region_init(r, head, (size_t)st.st_size); 80 81 error: 82 (void)close(fd); 83 return ret; 84 } 85 86 void 87 _citrus_unmap_file(struct _citrus_region *r) 88 { 89 90 _DIAGASSERT(r != NULL); 91 92 if (_region_head(r) != NULL) { 93 (void)munmap(_region_head(r), _region_size(r)); 94 _region_init(r, NULL, 0); 95 } 96 } 97