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citrus_mmap.c revision 1.4 
      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