lib/libc/citrus/citrus_mmap.c

   1 /* $NetBSD: src/lib/libc/citrus/citrus_mmap.c,v 1.3 2005/01/19 00:52:37 mycroft Exp $ */
   2 /* $DragonFly: src/lib/libc/citrus/citrus_mmap.c,v 1.3 2008/04/10 10:21:01 hasso 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/types.h>
  31 #include <sys/mman.h>
  32 #include <sys/stat.h>
  33 #include <assert.h>
  34 #include <errno.h>
  35 #include <fcntl.h>
  36 #include <limits.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41
  42 #include "citrus_namespace.h"
  43 #include "citrus_region.h"
  44 #include "citrus_mmap.h"
  45
  46 int
  47 _citrus_map_file(struct _citrus_region * __restrict r,
  48     const char * __restrict path)
  49 {
  50         int fd, ret = 0;
  51         struct stat st;
  52         void *head;
  53
  54         _DIAGASSERT(r != NULL);
  55
  56         _region_init(r, NULL, 0);
  57
  58         if ((fd = open(path, O_RDONLY)) == -1)
  59                 return errno;
  60         if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) {
  61                 ret = errno;
  62                 goto error;
  63         }
  64
  65         if (fstat(fd, &st)  == -1) {
  66                 ret = errno;
  67                 goto error;
  68         }
  69         if (!S_ISREG(st.st_mode)) {
  70                 ret = EOPNOTSUPP;
  71                 goto error;
  72         }
  73
  74         head = mmap(NULL, (size_t)st.st_size, PROT_READ, MAP_FILE|MAP_PRIVATE,
  75             fd, (off_t)0);
  76         if (head == MAP_FAILED) {
  77                 ret = errno;
  78                 goto error;
  79         }
  80         _region_init(r, head, (size_t)st.st_size);
  81
  82 error:
  83         close(fd);
  84         return ret;
  85 }
  86
  87 void
  88 _citrus_unmap_file(struct _citrus_region *r)
  89 {
  90         _DIAGASSERT(r != NULL);
  91
  92         if (_region_head(r) != NULL) {
  93                 munmap(_region_head(r), _region_size(r));
  94                 _region_init(r, NULL, 0);
  95         }
  96 }