lib/libc/citrus/citrus_mmap.c

   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 }