101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
/* $NetBSD: citrus_mmap.c,v 1.3 2005/01/19 00:52:37 mycroft Exp $ */
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/*-
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* Copyright (c)2003 Citrus Project,
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: citrus_mmap.c,v 1.3 2005/01/19 00:52:37 mycroft Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <sys/mman.h>
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#include "citrus_namespace.h"
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#include "citrus_region.h"
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#include "citrus_mmap.h"
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int
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_citrus_map_file(struct _citrus_region * __restrict r,
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const char * __restrict path)
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{
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int fd, ret = 0;
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struct stat st;
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void *head;
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_DIAGASSERT(r != NULL);
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_region_init(r, NULL, 0);
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if ((fd = open(path, O_RDONLY)) == -1)
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return errno;
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if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) {
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ret = errno;
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goto error;
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}
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if (fstat(fd, &st) == -1) {
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ret = errno;
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goto error;
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}
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if (!S_ISREG(st.st_mode)) {
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ret = EOPNOTSUPP;
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goto error;
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}
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head = mmap(NULL, (size_t)st.st_size, PROT_READ, MAP_FILE|MAP_PRIVATE,
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fd, (off_t)0);
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if (head == MAP_FAILED) {
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ret = errno;
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goto error;
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}
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_region_init(r, head, (size_t)st.st_size);
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error:
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(void)close(fd);
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return ret;
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}
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void
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_citrus_unmap_file(struct _citrus_region *r)
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{
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_DIAGASSERT(r != NULL);
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if (_region_head(r) != NULL) {
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(void)munmap(_region_head(r), _region_size(r));
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_region_init(r, NULL, 0);
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}
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}
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