lib/libc/citrus/citrus_mmap.c

   1 /* $FreeBSD: head/lib/libc/iconv/citrus_mmap.c 263986 2014-04-01 10:36:11Z tijl $ */
   2 /*      $NetBSD: citrus_mmap.c,v 1.4 2011/10/15 23:00:01 christos 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/cdefs.h>
  31 #include <sys/mman.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34
  35 #include <assert.h>
  36 #include <errno.h>
  37 #include <fcntl.h>
  38 #include <limits.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43
  44 #include "citrus_namespace.h"
  45 #include "citrus_region.h"
  46 #include "citrus_mmap.h"
  47
  48 int
  49 _citrus_map_file(struct _citrus_region * __restrict r,
  50     const char * __restrict path)
  51 {
  52         struct stat st;
  53         void *head;
  54         int fd, ret;
  55
  56         ret = 0;
  57
  58         _region_init(r, NULL, 0);
  59
  60         if ((fd = open(path, O_RDONLY | O_CLOEXEC)) == -1)
  61                 return (errno);
  62
  63         if (fstat(fd, &st)  == -1) {
  64                 ret = errno;
  65                 goto error;
  66         }
  67         if (!S_ISREG(st.st_mode)) {
  68                 ret = EOPNOTSUPP;
  69                 goto error;
  70         }
  71
  72         head = mmap(NULL, (size_t)st.st_size, PROT_READ, MAP_FILE|MAP_PRIVATE,
  73             fd, (off_t)0);
  74         if (head == MAP_FAILED) {
  75                 ret = errno;
  76                 goto error;
  77         }
  78         _region_init(r, head, (size_t)st.st_size);
  79
  80 error:
  81         (void)close(fd);
  82         return (ret);
  83 }
  84
  85 void
  86 _citrus_unmap_file(struct _citrus_region *r)
  87 {
  88
  89         if (_region_head(r) != NULL) {
  90                 (void)munmap(_region_head(r), _region_size(r));
  91                 _region_init(r, NULL, 0);
  92         }
  93 }